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Japanese gold leaf artists worked on a nano-scale: Study demonstrates X-ray fluorescence spectroscopy is a non-destructive way to date artwork

Nanotech-Now - July 7, 2014 - 7:45am
Ancient Japanese gold leaf artists were truly masters of their craft. An analysis of six ancient Namban paper screens show that these artifacts are gilded with gold leaf that was hand-beaten to the na...
Categories: Nanotechnology News

Plasmons excite hot carriers

Nanotechweb - July 7, 2014 - 5:01am
New theory could help enhance solar-energy conversion in photovoltaic devices and make better photocatalysts.
Categories: Nanotechnology News

Surfactant stops colloidal nanocrystals sticking

Nanotechweb - July 7, 2014 - 4:35am
Technique could greatly improve yields in droplet-based reactors.
Categories: Nanotechnology News

STFC takes delivery of the 100th Hitachi Tabletop SEM in the UK

Nanotech-Now - July 5, 2014 - 7:45am
STFC's Innovations Technology Access Centre (I-TAC) has strengthened its imaging capabilities by installing additional Hitachi benchtop SEMs at both its Harwell and Daresbury campuses. These two instr...
Categories: Nanotechnology News

New NIST metamaterial gives light a one-way ticket

Nanotech-Now - July 5, 2014 - 7:45am
The light-warping structures known as metamaterials have a new trick in their ever-expanding repertoire. Researchers at the National Institute of Standards and Technology (NIST) have built a silver, g...
Categories: Nanotechnology News

Modelling molecular magnets

Nanotechweb - July 4, 2014 - 3:36am
Latest calculations will not only be crucial for developing real-world devices from these materials but also for studying fundamental nanoscale quantum phenomena such as magnetic tunnelling.
Categories: Nanotechnology News

Funding in Brazil plays to nanotechnology research strengths

Nanotechweb - July 4, 2014 - 3:27am
The SisNANO project aims to put a system in place that provides the necessary expertise, personnel, state-of-the-art research equipment and connections between researchers in academia and industry so that nanotechnology can achieve its potential in various industrial applications.
Categories: Nanotechnology News

Making dreams come true: Making graphene from plastic?

Nanotech-Now - July 3, 2014 - 7:45am
Graphene is gaining heated attention, dubbed a "wonder material" with great conductivity, flexibility and durability. However, graphene is hard to come by due to the fact that its manufacturing proces...
Categories: Nanotechnology News

Squid sucker ring teeth material could aid reconstructive surgery, serve as eco-packaging

Nanotech-Now - July 3, 2014 - 7:45am
Squid tentacles are loaded with hundreds of suction cups, or suckers, and each sucker has a ring of razor-sharp "teeth" that help these mighty predators latch onto and take down prey. In a study publi...
Categories: Nanotechnology News

Toward a new way to keep electronics from overheating

Nanotech-Now - July 3, 2014 - 7:45am
Computer technology has transformed the way we live, but as consumers expect ever more from their devices at faster speeds, personal computers as well as larger electronic systems can overheat. This c...
Categories: Nanotechnology News

Shrinky Dinks close the gap for nanowires

Nanotech-Now - July 3, 2014 - 7:45am
How do you put a puzzle together when the pieces are too tiny to pick up? Shrink the distance between them. Engineers at the University of Illinois at Urbana-Champaign are using Shrinky Dinks, plas...
Categories: Nanotechnology News

Innovation Management and the Emergence of the Nanobiotechnology Industry

Nanotech-Now - July 3, 2014 - 7:45am
The confluence of nanotechnology and biotechnology is creating opportunities and an emerging industry, nanobiotechnology, with tremendous potential for economic and social value creation. The medical...
Categories: Nanotechnology News

Harris & Harris Group Portfolio Company HZO Raises $20 Million in Growth Financing

Nanotech-Now - July 3, 2014 - 7:45am
Harris & Harris Group, Inc. (Nasdaq:TINY), an investor in transformative companies enabled by disruptive science, today announced that it has invested $2 million in portfolio company HZO, Inc.'s , $20...
Categories: Nanotechnology News

Albany NanoCollege Faculty Member Selected as Editor-in-Chief of the Prestigious Journal of Electronic Materials

Nanotech-Now - July 3, 2014 - 7:45am
Newly merged CNSE/SUNYIT Associate Professor of Nanoengineering Dr. F. (Shadi) Shahedipour-Sandvik to leverage cutting-edge experience at the NanoCollege and manage internationally recognized journal.
Categories: Nanotechnology News

Up in Flames: Evidence Confirms Combustion Theory: Berkeley Lab and University of Hawaii research outlines the story of soot, with implications for cleaner-burning fuels

Nanotech-Now - July 3, 2014 - 7:45am
Researchers at the Department of Energy's Lawrence Berkeley National Lab (Berkeley Lab) and the University of Hawaii have uncovered the first step in the process that transforms gas-phase molecules in...
Categories: Nanotechnology News

New Study Raises Possibility of Production of P-Type Solar Cells

Nanotech-Now - July 3, 2014 - 7:45am
Iranian researchers from Shahid Beheshti University produced nanoparticles in homogenous particle sizes to make possible the production of p-type pigment solar cells.
Categories: Nanotechnology News

Improved Method of Device Area Scale-up for SWNT/Silicon Hybrid Solar Cells Using Silver Nanowires

National Nanomanufacturing Network - July 2, 2014 - 5:57am
While research on silicon solar cells has progressed the development of all organic, inorganic, and hybrid materials systems to simultaneously address the diverse set of design criteria for optimal photovoltaic (PV) performance, incorporation of hybrid materials systems has proven to be an effective method to improve some of these issues. With crystalline silicon representing the standard for high efficiency in solar cell designs, cell cost and production capacity remain concerns for the growing emphasis on broad implementation of renewable energy strategies on a global basis, with solar PV being a leading competitor. With recent studies demonstrating that the approach incorporating p-type nano-Carbon with n-type silicon in a hybrid film approach provides excellent diode junction rectification properties, improved collection and transport efficiencies due to the enhanced conductivity of the nano-C film, and superior semiconductor barrier properties at the nano-C/silicon junction. While this has proven effective for small cell design of a few square millimeters, scaling the cell area has proven challenging due to the increase in sheet resistance (Rs) of the nano-C layer as area increases resulting in a reduction in cell efficiency. Recently, Li, et.al, from the Taylor group in the Chemical and Environmental Engineering Department at Yale University, reported on a approach to significantly improve the performance for scaling up cell area for hybrid single walled carbon nanotubes (SWNT)/Silicon solar cells. In this work, the authors utilized p-type SWNTs cast onto n-type silicon as a dense film approximately 15 nm in thickness. For small cell areas on the order of 1-2 mm2, cell performance was significantly improved in comparison to other hybrid approaches due to the low Rs of the SWNT film. For larger cell areas, the Rs increased substantially to kilo-ohm/square, resulting in decreased cell efficiency. While increasing the SWNT film thickness could potentially lower Rs, the trade-off would be a reduction in optical transparency for the film, which would still reduce cell efficiency during scale-up. Patterning of metal conductor traces over the SWNT film was considered as a means to reduce Rs, but the evaporation of metal over the SWNT film resulted in cell shorting as some of the metal penetrated the pores in the film to the silicon junction. Instead, a strategy of casting silver nanowires (AgNWs) from solution at medium densities was investigated as a means to lower Rs while maintaining reasonable optical transparency during cell area scale-up. Reported results showed that casting of the AgNW films over the SWNT film reduced Rs for the scaled cell structures, and that even with the slight increase in optical absorption with the additive bilayer film, the overall performance of the scaled cells was significantly improved in comparison to the SWNT/Silicon hybrid cell design. The cells exhibited improved fill-factors which were most predominant in enhancing the efficiency, even with slight reductions in open circuit voltage and short circuit current observed for the scaled cell areas. To further improve the optical absorption for the cell, the authors cast titania (TiO2) nanoparticles over the AgNW/SWNT surfaces to reduce reflection and increase forward scattering of incident solar radiation, resulting in a marginal improvement which was further increased via post process steps. This work has developed a solution-based approach to mitigate the total resistive power loss that typically hinders the area scale-up of hybrid nano-C/Si solar cells. A nearly twofold increase of photovoltaic efficiency is observed upon the coating of AgNWs onto SWNT/Si junctions, resulting from the significant reduction in the Rs enabled by the AgNW/SWNT bilayer. The SWNT thin film with high optical transparency and extremely small thickness also allows for the direct solution deposition of antireflective TiO2 nanoparticles. A final efficiency of >10% was realized in 49 mm2 cells, with implications for complete solution processed solar cell manufacturing and ultimately cell cost reduction. The work further illustrates the role and versatility that additive nanostructured films can contribute to performance improvements for cell area scale-up. References: Device Area Scale-Up and Improvement of SWNT/Si Solar Cells Using Silver Nanowires (http://onlinelibrary.wiley.com/doi/10.1002/aenm.201400186/pdf). Xiaokai Li, Yeonwoong Jung, Jin-Shun Huang, Tenghooi Goh, and André D. Taylor; Advanced Energy Materials 2014. DOI: 10.1002/aenm.201400186 (http://dx.doi.org/10.1002/aenm.201400186) Images reprinted with permission from John Wiley and Sons; Advanced Energy Materials; Device Area Scale-Up and Improvement of SWNT/Si Solar Cells Using Silver Nanowires; © 2014 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim; Xiaokai Li,Yeonwoong Jung,Jing-Shun Huang,Tenghooi Goh,André D. Taylor.

MoS2's dielectric constant is not constant

Nanotechweb - July 2, 2014 - 5:24am
Finding will be important for when it comes to designing molybdenum disulphide-based devices in the future
Categories: Nanotechnology News