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Catenane structure makes “sense-and-treat” device

Nanotechweb - February 20, 2015 - 4:04am
Interlocked rings switch from one catalytic state to another thanks to an external trigger.
Categories: Nanotechnology News

Van der Waals heterostructures make good LEDS

Nanotechweb - February 19, 2015 - 6:07am
The structures, which are only around 10-40 atoms thick, might be used in semi-transparent devices, such as displays, and in flexible electronics.
Categories: Nanotechnology News

Carbon nanotubes show feasibility for practical devices

National Nanomanufacturing Network - February 19, 2015 - 4:38am
While carbon nanotubes (CNTs) have long attracted interest for nanoscale electronics, practical deployment of the technology requires a level of device consistency that is still a long way from being achieved. Now researchers at IBM in the US have identified the main source of device variability in CNT transistors and ways of reducing it. In recent years, silicon transistors have been fast approaching their minimum size. Short channel effects and increasing chip power density may halt the trend in constantly decreasing transistor sizes described in 'Moore’s Law'. Fortunately, there is an alternative. "The goal of our research is to develop carbon nanotube transistors into a practical technology that can replace silicon in future generations of high-performance microprocessor chips," says Qing Cao (http://researcher.ibm.com/researcher/view.php?person=us-qcao), who led the IBM research team behind these latest results. Carbon nanotubes have excellent short channel control, a low resistivity between the CNTs and metal contacts, and transport behaviour that allows much lower power consumption for the same on-current density. However where they have fallen short so far is in the uniformity between CNT devices. "Ultimately we want to integrate billions of nanotube transistors into functional circuits," says Cao. "To do this, we need good consistency from one transistor to the next, so they can all work together at the same voltage." Their latest study demonstrates that the device variability does not originate from the nanotubes themselves, and that it may be reduced by improved deposition processes and better materials for the dielectric components.Finding the root of the problem The researchers fabricated hundreds of bottom-gated field-effect transistors, each made from a p-channel single-walled CNT with a 10nm HfO2 layer deposited as the gate dielectric. Systematic experiments with the devices identified the amount of variability from device to device. The measurements also confirmed that variation in carbon nanotube diameter was not a dominant source of variability in device performance. The IBM team then built pairs of devices, where the same nanotube was used as the channel for both transistors. Observations of the performance of device pairs revealed that the dominant source was random, and so likely material-related rather than a systematic process-related contribution. Further analysis indicated that trapped charges fixed at the oxide/air interface were the prime suspect. "I think the results show that it is possible to build practical circuits based on nanotube transistors, but we still need to reduce the variability by several-fold," Cao tells nanotechweb.org. "We have identified the major source as the oxide surface, not anything intrinsic to the nanotubes, so we think we can make it happen with a better fabrication process." He suggests that the variability may be reduced by better control over the nanotube source and the deposition process. "The current nanotube solution isn’t really electronic grade, so we may introduce charges on the oxide during the nanotube deposition process," says Cao. He also suggests that using high quality dielectrics with no free surface near the nanotube may also help. From working to working well Cao describes how far CNT electronics has come in the past few decades. "In the beginning, it was an achievement just to make a few good transistors," he says. The fabrication techniques for these devices are now so advanced that it is possible to fabricate a large enough number of high-quality semiconducting nanotubes to study their random behaviour. He adds, "As it gets closer to becoming a practical technology, the device variability becomes an increasingly important issue." Next the team will work to try and find where the trapped charges come from, and whether they are mainly from dangling bonds at the oxide surface, damage to the oxide during the fabrication process, or residue left by the nanotube solution do that they can eliminate them. Full details are reported in nanotechweb.org (http://nanotechweb.org/cws/article/tech/60243)

CNTs show feasibility for practical devices

Nanotechweb - February 18, 2015 - 12:43pm
A study of carbon nanotube transistors identifies the origin of device variability and ways to improve it.
Categories: Nanotechnology News

United Nanotech Innovations Lists Materials for Trade on INSCX™ Exchange and Appoints Fullerex as Merchant

Nanotech-Now - February 18, 2015 - 7:45am
United Nanotech Innovations Pvt Ltd. (UNIPL), Bangalore, India a part of UAE based Darwish Bin Ahmed Group has formally joined INSCX™ Exchange, the world marketplace for nano-materials, polymers, TiO2...
Categories: Nanotechnology News

Arrowhead to Present at 2015 RBC Capital Markets' Global Healthcare Conference

Nanotech-Now - February 18, 2015 - 7:45am
Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical company developing targeted RNAi therapeutics, today announced that Arrowhead's chief operating officer Bruce Given, M.D., will prese...
Categories: Nanotechnology News

Insight into inner magnetic layers: Measurements at BESSY II have shown how spin filters forming within magnetic sandwiches influence tunnel magnetoresistance -- results that can help in designing spintronic component-

Nanotech-Now - February 18, 2015 - 7:45am
In doing so, the teams enhanced our understanding of processes that are important for future TMR data storage devices and other spintronic components. Their results have now been published in Nature C...
Categories: Nanotechnology News

Half spheres for molecular circuits: Corannulene shows promising electronic properties

Nanotech-Now - February 18, 2015 - 7:45am
Imagine taking a fullerene (C60) and cutting it in half like a melon. What you get is a corannulene (C20H10), a molecule that, according to a just-published study conducted with SISSA's collaboration,...
Categories: Nanotechnology News

Novel crumpling method takes flat graphene from 2-D to 3-D

Nanotech-Now - February 18, 2015 - 7:45am
Researchers at the University of Illinois at Urbana-Champaign have developed a unique single-step process to achieve three-dimensional (3D) texturing of graphene and graphite. Using a commercially ava...
Categories: Nanotechnology News

A rapid extension of nanographene sheets from readily available hydrocarbons: Precisely controlled synthesis of structurally uniform carbon sheets could advance nanographene materials science

Nanotech-Now - February 18, 2015 - 7:45am
Commercially available hydrocarbons were used as templates to synthesize uniform nanographene sheets using a series of sheet extending agents and a new transition metal catalyst, which were developed...
Categories: Nanotechnology News

Voltage tester for beating cardiac cells

Nanotech-Now - February 18, 2015 - 7:45am
Electrical impulses play an important role in cells of the human body. For example, neurons use these impulses to transmit information along their branches and the body also uses them to control the c...
Categories: Nanotechnology News

Improved fire detection with new ultra-sensitive, ultraviolet light sensor

Nanotech-Now - February 18, 2015 - 7:45am
A new study published today in Scientific Reports has discovered that a material traditionally used in ceramics, glass and paint can be manipulated to produce an ultra-sensitive UV light sensor, pavin...
Categories: Nanotechnology News

Novel solid-state nanomaterial platform enables terahertz photonics

Nanotech-Now - February 18, 2015 - 7:45am
Scientists are pioneering the use of nanomaterials in compact, sensitive, fast, low-cost terahertz detectors with potential in applications such as biomedical diagnostics, airport security screening a...
Categories: Nanotechnology News

A new spin on spintronics: Michigan team tests radiation-resistant spintronic material, possibly enabling electronic devices that will work in harsh environments

Nanotech-Now - February 18, 2015 - 7:45am
A team of researchers from the University of Michigan and Western Michigan University is exploring new materials that could yield higher computational speeds and lower power consumption, even in harsh...
Categories: Nanotechnology News

Nanotechnology facility planned in Lund, Sweden: A production facility for start-ups in the field of nanotechnology may be built in the Science Village in Lund, a world-class research and innovation village that is also home to ESS, the European Spallatio

Nanotech-Now - February 16, 2015 - 7:45am
"With this new facility, we want to create the conditions to enable new companies to develop from the R&D phase to full production, without needing to leave Sweden," says Lars Samuelson, Professor of...
Categories: Nanotechnology News

Ligar secures investment from Wallace Corporation to commercialise polymers that pick out good and bad molecules: Ground-breaking science innovation removes molecules in the wrong place from liquids

Nanotech-Now - February 16, 2015 - 7:45am
Hamilton-based Ligar, the developer of molecularly imprinted polymers (MIPs) for purification and extraction, today announced it has secured an initial investment of hundreds of thousands of dollars f...
Categories: Nanotechnology News

The future of electronics -- now in 2-D: Work could ultimately lead to electrical conductors that are 100 percent efficient

Nanotech-Now - February 16, 2015 - 7:45am
The future of electronics could lie in a material from its past, as researchers from The Ohio State University work to turn germanium--the material of 1940s transistors--into a potential replacement f...
Categories: Nanotechnology News

Scientists in Iran Use Nanotechnology for Industrial Purification of Drinking Water

Nanotech-Now - February 16, 2015 - 7:45am
Payamavaran Nanofanavari Fardanegar (PNF) Company for the first time implemented a project to purify drinking water from arsenic by using cavitation and active alumina nanotechnology in Ardabil Provin...
Categories: Nanotechnology News

Nanotechnology Electric Vehicle (EV) Market Analysis Report 2015: According to Radiant Insights, Inc

Nanotech-Now - February 16, 2015 - 7:45am
New Market Research Reports Title "Nanotechnology Electric Vehicle (EV) Market Analysis Report 2015: According to Radiant Insights, Inc" Has Been Added to RadiantInsights.com Report Database.
Categories: Nanotechnology News

Mars Science Laboratory (Curiosity) Rover and Science Team Wins the National Space Society's von Braun Award

Nanotech-Now - February 16, 2015 - 7:45am
The Mars Science Laboratory (Curiosity) Rover and Science Team is the winner of the National Space Society's Wernher von Braun Memorial Award. This award will be presented at the National Space Societ...
Categories: Nanotechnology News