| Gold nanowire (6) |  |
| Nanowire (421) | |
| Silicon nanowire (33) | |
| Silver nanowire (31) | |
| Gold nanowire (6) | |
| Nanowire (421) | |
| Silicon nanowire (33) | |
| Silver nanowire (31) | |
#Wearable sensor clears path to long-term EKG EMG monitoring Researchers from North carolina State university have developed a new, wearable sensor that uses silver nanowires to monitor electrophysiological signals, such as electrocardiography
The new nanowire sensor is comparable to the wet sensors in terms of signal quality, but is a"dry"electrode-it doesn't use a gel layer,
because the nanowires are inlaid in the polymer.""The sensors stem from Zhu's earlier work to create highly conductive and elastic conductors made from silver nanowires,
and consist of one layer of nanowires in a stretchable polymer. The new sensor is also more accurate than existing technologies at monitoring electrophysiological signals
when a patient is in motion.""The silver nanowire sensors conform to a patient's skin, creating close contact,
"Zhu says.""And, because the nanowires are so flexible, the sensor maintains that close contact even when the patient moves.
The nanowires are also highly conductive, which is key to the high signal quality.""The new sensors are also compatible with standard EKG
-and EMG-reading devices.""I think these sensors are essentially ready for use, "Zhu says"The raw materials of the sensor are comparable in cost to existing wet sensors,
is a postage-stampized chip with nanowires that are 1, 000 times thinner than a human hair and are coated with antibodies that recognize circulating tumor cells.
the tumor cells stick to the nanowires like Velcro. Capturing the tumor cells was just part of the battle, though.
Polymer brushes on the Nanovelcro nanowires respond to the temperature changes by altering their physical properties allowing them to capture
By increasing the strength of the pili nanowires she improved their ability to clean up uranium and other toxic wastes.
The Geobacter biofilm encased by a network of nanowires and slime gives the bacteria a shield
As the biofilm concentrates many nanowires around the Geobacter cells more uranium can be mineralized bound
Much of Reguera research with these bacteria focuses on engineering their conductive pili or nanowires.
Using a scanning electron microscope the Stanford team captured images of these microbes attaching milky tendrils to the carbon filaments. ou can see that the microbes make nanowires to dump off their excess electronscriddle says.
And because e-jet can naturally handle fluid inks it is suited exceptionally well for patterning solution suspensions of nanotubes nanocrystals nanowires
Researchers then programmed the E coli cells to produce biofilms with the conducting properties of gold nanowires.
and phosphorus. Keep the nanowires in line by etching them clean with hydrochloric acid and confining their diameter to 180 nanometers.
Exposed to the sun, a solar cell employing such nanowires can turn nearly 14 percent of the incoming light into electricity#a new record that opens up more possibilities for cheap and effective solar power.
#and validated at Germany's Fraunhofer Institute for Solar energy systems#this novel nanowire configuration delivered nearly as much electricity as more traditional indium phosphide thin-film solar cells
even though the nanowires themselves covered only 12 percent of the device's surface. That suggests such nanowire solar cells could prove cheaper
#and more powerful#if the process could be industrialized, argues physicist Magnus Borgstr#m of Lund University in Sweden,
The key will be even finer control of the nanowires themselves as they grow as well as the chemical tweaking of the constituent compounds.
Borgstr#m, for one, suspects that nanowire solar cells will stand on their own once the production process can be simplified,
such as growing the nanowires by applying simple heat and evaporation techniques in future. He explains:
Bao via e-mail. am impressed that they were able to inject even the nanowire transistors with very high yield.""
Mirin made a nanowire detector that operates at-270 C. This boosted the number of photons it received each second by two orders of magnitude compared with regular detectors.
and create gold nanowires conducting biofilms and films studded with quantum dots or tiny crystals that exhibit quantum mechanical properties.
If gold nanoparticles are added to the environment the histidine tags will grab onto them creating rows of gold nanowires and a network that conducts electricity.
And the ground receiver is based on arrays of small inexpensive telescopes that are coupled fiber to highly efficient superconducting nanowires a photon counting technology that was brought to its high state of maturity by joint MIT and Lincoln Lab teams.
The new approach uses yarns, made from nanowires of the element niobium, as the electrodes in tiny supercapacitors (which are essentially pairs of electrically conducting fibers with an insulator between).
and that niobium nanowire yarn is a promising an alternative. magine youe got some kind of wearable health-monitoring system,
The new nanowire-based supercapacitor exceeds the performance of existing batteries, while occupying a very small volume. f youe got an Apple Watch and
500 degrees Celsius so devices made from these nanowires could potentially be suitable for use in high-temperature applications.
individual niobium nanowires are just 140 nanometers in diameter 140 billionths of a meter across,
#Scalable growth of high quality bismuth nanowires Bismuth nanowires have intriguing electronic and energy harvesting application possibilities.
A group at the CFN Brookhaven National Laboratory has demonstrated a new technique to produce single-crystal nanowires atop arbitrary substrates including glass silicon
#The simplicity of the technique and the universality of the mechanism open a new avenue for the growth of nanowire arrays of a variety of materials.
This is the first report on the high yield(>70%)synthesis of single crystalline bismuth nanowires a material with potentially exploitable and intriguing thermoelectric properties.#
#This technique produces bismuth nanowires in quantities limited only by the size of the substrate on
#The dimensions of the bismuth nanowires can be tuned over a very wide range simply by varying the substrate's temperature.#
#Further in contrast with other fabrication methods with this new technique there is no need for a catalyst to activate the production of the nanowires
CFN's Materials Synthesis and Characterization Electron microscopy and Advanced UV and X-ray Probes Facilities were used for synthesis of nanowires and their structural characterization.
Uniform nanowire arrays for science and manufacturing More information: Surface energy induced formation of single crystalline bismuth nanowires over vanadium thin film at room temperature.
Nano Letters 14 5630#5635 (2014) DOI: 10.1021/nl502208 2
#New'electronic skin'for prosthetics robotics detects pressure from different directions Touch can be a subtle sense,
They describe their nanowire mesh design in the journal ACS Nano. Peidong Yang Bin Liu and colleagues note that harnessing sunlight to split water
The researchers took a page from the paper industry using one of its processes to make a flat mesh out of light-absorbing semiconductor nanowires that
#Uniform nanowire arrays for science and manufacturing Defect-free nanowires with diameters in the range of 100 nanometers (nm) hold significant promise for numerous in demand applications including printable
Reproducible synthesis of gallium nitride nanowires with controlled size and location on silicon substrates. The result was achieved by improving selective wire-growth processes to produce one nanowire of controlled diameter per mask-grid opening over a range of diameters from 100 nm to 200 nm.
Ordered arrays with a variety of spacings were fabricated. In the near term the research will be used to create a wafer-scale arrays of probes for devices that examine the surface
and near-surface properties of materials to optimize nanowire LEDS and to produce nanowires with controlled diameter for a collaborative project involving printable transistors for millimeter-wave reconfigurable antennae e
#Designing complex structures beyond the capabilities of conventional lithography Gold nanoparticles smaller than 10 nanometers spontaneously self-organize in entirely new ways
Silver nanowire ink which is highly conductive and stable offers a more practical solution. Hu's team wanted to develop a way to print it directly on paper to make a sensor that could respond to touch or specific molecules such as glucose.
Direct Writing on Paper of Foldable Capacitive Touch Pads with Silver nanowire Inks ACS Appl. Mater.
10.1021/am506987w Abstractpaper-based capacitive touch pads can be fabricated utilizing high-concentration silver nanowire inks needle-printed directly onto paper substrates through a 2d programmable platform.
Post deposition silver nanowire tracks can be sintered photonically using a camera flash to reduce sheet resistance similar to thermal sintering approaches.
Touch pad sensors on a variety of paper substrates can be achieved with optimized silver nanowire tracks.
Researchers at the University of Pennsylvania have engineered a nanowire system that could pave the way for this ability,
the researchers needed a way to amplify the intensity of a light wave as it passed through a cadmium sulfide nanowire.
partially wrapping the nanowire in a silver shell that acts like an echo chamber. Agarwal's group had employed a similar design before in an effort to create photonic devices that could switch on and off very rapidly.
but, by changing the polarization of the light as it entered the nanowire, the researchers were able to better confine it to the frequency-altering, nonlinear part of the device:
the nanowire core.""By engineering the structure so that light is contained mostly within the cadmium sulfide rather than at the interface between it and the silver shell,
which can be done by altering the size of the nanowire and the shell.""Most important,
#Team grows uniform nanowires A researcher from Missouri University of Science and Technology has developed a new way to grow nanowire arrays with a determined diameter length and uniform consistency.
This approach to growing nanomaterials will improve the efficiency of various devices including solar cells and fuel cells.
These semiconducting nanowires could also replace thin films that cover today's solar panels. Current panels can process only 20 percent of the solar energy they take in.
By applying the nanowires the surface area of the panels would increase and allow more efficient solar energy capture and conversion.
In fuel cells these nanowire arrays can be used to lower production expenses by relying on more cost-efficient catalysts.
or outperform the current use of platinum and show that these nanowire arrays are better catalysts for the oxygen reduction reactions in the cells says Dr. Manashi Nath assistant professor of chemistry at Missouri S&t.
The nanowires which are grown on patterned nanoelectrodes are visible only through an electron microscope. Nath creates the nanowire arrays through a process that she calls confined electrodeposition on lithographically patterned nanoelectrodes.
To grow the nanowires Nath writes an image file that creates a pattern for the shape
and size she wants to produce. Using electron beam lithography she then stamps the pattern onto a polymer matrix
and the nanowires are grown by applying electric current through electrodeposition. Nath grows the nanowires in a parallel pattern
which resembles a series of nails protruding from a piece of lumber. One end is held secure to a metal conductor like copper
To increase the nanowires'surface area Nath can make them hollow in the middle much like carbon nanotubes found in optics and electronics.
The nanowires allow current to travel through them. The polymer which is nonconductive can be removed to allow the wires to stand freely
Miniature all-solid-state heterostructure nanowire Li-ion batteries as a tool for engineering and structural diagnostics of nanoscale electrochemical processes.
#New research points to graphene as a flexible low-cost touchscreen solution New research published today in the journal Advanced Functional Materials suggests that graphene-treated nanowires could soon replace current touchscreen technology
Researchers from the University of Surrey and AMBER the materials science centre based at Trinity college Dublin have demonstrated now how graphene-treated nanowires can be used to produce flexible touchscreens at a fraction of the current cost.
Using a simple scalable and inexpensive method the researchers produced hybrid electrodes the building blocks of touchscreen technology from silver nanowires and graphene.
Lead author Dr Izabela Jurewicz from the University of Surrey commented Our work has cut the amount of expensive nanowires required to build such touchscreens by more than fifty times as well as simplifying the production process.
In the form of nanowires and nanoparticles it has particular potential for use in the manufacture of solar cells
It had already been demonstrated on nanowires made from one crystalline form of gallium arsenide the cubic so-called zincblende structure that the band gap widens under pressure.
The present research focused instead on nanowires of a less-common crystalline form the hexagonal so-called wurtzite structure.
They discovered the band gap that the electrons need to leap across to also widened although not as much as in the case of the zincblende crystal nanowires.
Significantly they discovered that around 207000 times normal atmospheric pressure (21 gigapascals) the wurtzite gallium arsenide nanowires underwent a structural change that induced a new phase the so-called orthorhombic one
or even a single nanowire and realize much more complex and useful electronic functions through interactions across the phases Goncharov said.
#Controlling photoluminescence with silicon nanophotonics for better devices Silicon nanowires have a great deal of potential in future high-performance electronic sensing and energy devices.
Red photoluminescence has been reported in silicon nanowires but for many applications this hampers device performance. As Tsuyoshi Okuno from the University of Electro-Communications and his colleagues point out in a recent report
Okuno and his colleagues fabricated silicon nanowire arrays by metal-assisted chemical etching an approach that is simple and cost-effective.
and etched nanowires using aqueous H2o2. Although the researchers did not have precise control over the nanowire morphology they did observe that higher concentrations of H2o2 led to thicker nanowires.
Photoluminescence studies did not reveal a link between photoluminescence and nanowire diameter or length alone but low aspect ratio nanowires exhibited red photoluminescence.
Further observations of the morphology identified silicon nanocrystals at the nanowire ends which was corroborated by Raman studies of single nanowires.
These nanocrystals disappear on annealing as does the red photoluminescence. The researchers attribute the red photoluminescence to defect states between nanocrystals and surrounding oxide and excitonic transitions.
As the researchers conclude in their report These results of Si nanowire arrays are believed to be useful for future optoelectronic and photovoltaic applications.
Oda K. Nanai Y. Sato T. Kimura S. & Okuno T. Correlation between photoluminescence and structure in silicon nanowires fabricated by metal-assisted etching.
and gold nanowires approx. 12 nanometres in diameter and 42 nanometres in length. The gold wire is therefore only about one ten-thousandth the thickness of a hair.
The microsphere and nanowire amplify the interaction between light and molecules. With the help of a prism, the researchers shine laser light into the microsphere.
Vollmer and his colleagues therefore fix a nanowire to the surface of the glass bead.
to the nanowire mounted on the microsphere. When a matching, i e. COMPLEMENTARY DNA fragment binds to the"bait"on the nanowire
the wavelength of the light shifts and is amplified by the microsphere and nanowire. This shift can be measured.
Different strand sections can be distinguished by their binding behaviour However, the physicists used a shorter DNA fragment than is usual in similar procedures.
While one-dimensional materials such as carbon nanotubes and nanowires also allow excellent electrostatics and at the same time possess band gap they are not suitable for low-cost mass production due to their process complexities she said.
and Swiss Federal Institute of technology in Zurich describe a basic model circuit consisting of a silver nanowire and a single-layer flake of molybendum disulfide (Mos2).
K. Goodfellow R. Beams C. Chakraborty L. Novotny A n. Vamivakas Integrated nanophotonics based on nanowire plasmons and atomically-thin material Optica Vol. 1 Issue
The resulting Al nanowire networksith a width of 500 nm and an area fraction of 22.0%xhibited 80%optical transmittance and sheet resistance of 45 O sq-1
but a new way of working with copper nanowires and a PVA"nano glue"could be a game-changer.
Previous success in the field of ultra-lightweight"aerogel monoliths"has relied largely on the use of precious gold and silver nanowires.
but ours are made of ultra fine copper nanowires, using a fabrication process called freeze drying,
"Despite its conductivity, copper's tendency to oxidation and the poor mechanical stability of copper nanowire aerogel monoliths mean its potential has been unexplored largely.
"The conductivity can be tuned simply by adjusting the loading of copper nanowires, "he said.""A low loading of nano wires would be appropriate for a pressure sensor
the researchers noted that devices using their copper-based aerogels were not quite as sensitive as those using gold nanowires,
#Bacterial nanowires: Not what we thought they were For the past 10 years scientists have been fascinated by a type of electric bacteria that shoots out long tendrils like electric wires using them to power themselves
Today a team led by scientists at USC has turned the study of these bacterial nanowires on its head discovering that the key features in question are not pili as previously believed
Scientists had suspected long that bacterial nanowires were pili Latin for hair which are hairlike features common on other bacteria allowing them to adhere to surfaces
Given the similarity of shape it was easy to believe that nanowires were pili. But Moh El-Naggar assistant professor at the USC Dornsife College of Letters Arts and Sciences says he was always careful to avoid saying that he knew for sure that's what they were.
with bacterial nanowires. This latest study will be published online by the Proceedings of the National Academy of Sciences on August 18.
During the formation of nanowires scientists noted an increase in the expression of electron transport genes but no corresponding increase in the expression of pilin genes.
what nanowires weren't the team next needed to figure out what they actually were. El-Naggar credits Sahand Pirbadian USC graduate student with devising an ingenious yet simple strategy to make the discovery.
By depriving the bacteria of oxygen the researchers were able to force the bacteria to stretch out their nanowires on command allowing the process to be observed in real time.
and specific proteins researchers were able to take video of the nanowires reaching out confirming that they were based on membrane and not pili at all.
Generating videos of the nanowires stretching out required new methods to simultaneously label multiple features keep a camera focused on the wriggling bacteria and combine the optical techniques with atomic force microscopy to gain higher resolution.
and figure out the right conditions for the bacteria to produce nanowires Pirbadian said. We had to go back
Once we were able to induce nanowire growth we started analyzing their composition and structure
Shewanella oneidensis MR-1 nanowires are outer membrane and periplasmic extensions of the extracellular electron transport components PNAS www. pnas. org/cgi/doi/10.1073
His team has made ultrathin nanowires that can monitor and influence what goes on inside cells.
into a silicon nanowire. With this new method of producing hybrid nanowires, very fast and multifunctional processing units can be accommodated on a single chip in the future.
The research results will be published in the journal Nano Research. Nano-optoelectronics are considered the cornerstone of future chip technology,
they integrated compound semiconductor crystals made of indium arsenide (Inas) into silicon nanowires, which are suited ideally for constructing increasingly compact chips.
This integration of crystals was the greatest obstacle for such"hetero-nanowires"until now: beyond the nanometer range, crystal lattice mismatch always led to numerous defects.
and embedding of the Inas crystals into the nanowires for the first time. Implanted atoms form crystals in the liquid-Phase in order to carry out this process,
maintains the form of the liquid nanowire, "explains HZDR scientist Dr. Slawomir Prucnal, "while the implanted atoms form the indium arsenide crystals."
"In the next step, the scientists want to implement different compound semiconductors into Silicon nanowires and also optimize the size and distribution of the crystals a
One possibility is to use hybrid solar cells that combine silicon nanowires with low-cost, photoresponsive polymers. The high surface area and confined nature of nanowires allows them to trap significant amounts of light for solar cell operations.
Unfortunately, these thin, needle-like structures are very fragile and tend to stick together when the wires become too long.
Now, findings by Xincai Wang from the A*STAR Singapore Institute of Manufacturing Technology and co-workers from Nanyang Technological University could turn the tables on silicon nanowires by improving the manufacturing of silicon'nanoholes'arrow cavities carved into silicon wafers
#Shrinky Dinks close the gap for nanowires How do you put a puzzle together when the pieces are too tiny to pick up?
to close the gap between nanowires in an array to make them useful for high-performance electronics applications.
Nanowires are extremely fast, efficient semiconductors, but to be useful for electronics applications, they need to be packed together in dense arrays.
Researchers have struggled to find a way to put large numbers of nanowires together so that they are aligned in the same direction and only one layer thick."
"Chemists have done already a brilliant job in making nanowires exhibit very high performance. We just don't have a way to put them into a material that we can handle,
people can make nanowires and nanotubes using any method they like and use the shrinking action to compact them into a higher density."
"The researchers place the nanowires on the Shrinky Dinks plastic as they would for any other substrate,
This allows them to create very dense arrays of nanowires in a simple, flexible and very controllable way.
The shrinking method has added the bonus of bringing the nanowires into alignment as they increase in density.
and the low cost of plastic could have a huge impact on nanowire assembly and processing for applications."
For example, experiments have shown that film made of packed nanowires has properties that differ quite a bit from a crystal thin film."
made of densely packed nanowires, that could harvest energy from light much more efficiently than traditional thin-film solar cells s
nanowires and nanosheets at chosen thicknesses and lengths rather than the one-size-fits-all output of a chemical process, with no environmentally harmful residues.
#Atomic force microscope systems take a tip from nanowires (Phys. org) In response to requests from the semiconductor industry a team of PML researchers has demonstrated that atomic force microscope (AFM) probe
tips made from its near-perfect gallium nitride nanowires are superior in many respects to standard silicon
In addition the scientists have invented a means of simultaneously using the nanowire tips as LEDS to illuminate a tiny sample region with optical radiation
That technique called near-field scanning microwave microscopy (NSMM) had never before been attempted using a nanowire probe.
But as the team showed in a recent paper in Applied Physics Letters nanowire probe tips substantially outperformed commercial Pt tips in both resolution and durability.
By contrast our nanowire probe tips have a calibration lifetime about 10 times longer than any commercial tip.
The nanowire however retained its original dimensions. Moreover the Gan tips exhibited improved sensitivity and reduced uncertainty compared to a commercial Pt tip.
They believe that the use of nanowire probes in conjunction with the recent arrival of a brand-new custom-built four-probe NSMM instrument will reveal new aspects of nanostructure composition and performance.
Deploying a nanowire as a probe tip sounds deceptively simple. The researchers obtain a conventional AFM cantilever
Then using a minuscule manipulator they break off a single nanowire from a forest of them grown by molecular beam epitaxy insert the wire into the hole and weld it in place.
The researchers tested their tip against a silicon tip a platinum tip and an uncoated Gan nanowire each
The coated nanowire proved about twice as sensitive as the Pt probe and four times as sensitive as the others with superior mechanical performance.
Using the nanowire tip as a light source by doping it so that it functions as an LED.
Reaching that goal will require more research into how to dope the Gan nanowires so as to increase efficiency of light output
But we really weren't able to test nanowires as probe tips until a few months ago
and hyper-stretchable elastic-composite generator (SEG) using very long silver nanowire-based stretchable electrodes. Their stretchable piezoelectric generator can harvest mechanical energy to produce high power output (4 V) with large elasticity (250%)and excellent durability (over 104 cycles.
when you combine some biomimicry, metamaterials and nanowires? It turns out to be integrated the first circularly polarized light detector on a silicon chip.
Researchers at Vanderbilt University have used silver nanowires to fabricate a metamaterial that is capable of detecting polarized light in a way not unlike the way cuttlefish, bees,
the researchers fabricated the portable CPL sensors by laying down nanowires in a zigzag pattern over a thin sheet of acrylic affixed to a thick silver plate.
This material is affixed to the bottom of a silicon wafer with the nanowire side up.
The nanowires create a sea of electrons that produces lasmondensity waves, the oscillations in the density of electrons that are generated
The researchers found that they could make the zigzag pattern of nanowires with a right-or left-handed orientation.
When they arranged the nanowires in right-handed pattern, the surface absorbed right circularly polarized light
And when they arranged the nanowires to have both left-and right-handed patterns, the sensor could discern between left
Until now, the only experimental TFET to meet the International Technology Roadmap for Semiconductors (ITRS) goal of average subthreshold swing below 60 millivolts per decade over four decades of current was a transistor that used nanowires.
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