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Graphene-quantum-dot camera sees in the infrared

Nanotechweb - June 5, 2017 - 8:47am
(with video) CMOS-integrated device could find use in night vision and many other surveillance applications.

Nanoparticle shape controls properties

Nanotechweb - June 5, 2017 - 2:30am
Nanothermodynamics allows the thermal and optical characteristics of silicon–germanium to be predicted for various nanoparticle shapes and sizes.

The synchronized dance of skyrmion spins: Computer simulations reveal new insights into skyrmion particles, which are promising for next-generation information storage and processing devices

Nanotech-Now - June 4, 2017 - 7:45am
In recent years, excitement has swirled around a type of quasi-particle called a skyrmion that arises as a collective behavior of a group of electrons. Because they're stable, only a few nanometers in...

A more energy-efficient catalytic process to produce olefins: Carborane research by ChemE researcher Giannis Mpourmpakis lands cover of Catalysis Science & Technology

Nanotech-Now - June 4, 2017 - 7:45am
Research at the University of Pittsburgh into a more energy-efficient catalytic process to produce olefins, the building blocks for polymer production, was recently featured on the inside front cover...

Microsoft, Purdue collaborate to advance quantum computing

Nanotech-Now - June 4, 2017 - 7:45am
"If this project is successful it will cause a revolution in computing." That's the forecast of Michael Manfra, Purdue University's Bill and Dee O'Brien Chair Professor of Physics and Astronomy, Pr...

Aculon Expands NanoProof® Product Line for Electronics Waterproofing Technology: With growing market opportunities Aculon Launches NanoProof® 8 with Push Through Connectivity™ and NanoProof® DAB a syringe application

Nanotech-Now - June 4, 2017 - 7:45am
culon, Inc. announces the expansion of their NanoProof line of products with the release of NanoProof 8 series and NanoProof DAB (Direct Application Barrier). NanoProof 8 is next generation PCB waterp...

Off-the-Shelf, Power-Generating Clothes Are Almost Here

National Nanomanufacturing Network - June 2, 2017 - 12:48pm
A lightweight, comfortable jacket that can generate the power to light up a jogger at night may sound futuristic, but materials scientist Trisha Andrew at the Univ Trisha L. Andrew, Director of the Wearable Electronics Lab at the University of Massachusetts Amhers SEM images of pristine silk textile and PEDOT-coated silk textile. Image reprinted with permission from J.Wiley & Sons

Graphene and quantum dots put in motion a CMOS-integrated camera that can see the invisible

Nanotech-Now - June 2, 2017 - 7:45am
Over the past 40 years, microelectronics have advanced by leaps and bounds thanks to silicon and CMOS (Complementary metal-oxide semiconductors) technology, making possible computing, smartphones, com...

Ag/ZnO-Nanorods Schottky diodes based UV-PDs are fabricated and tested

Nanotech-Now - June 2, 2017 - 7:45am
In the recent past ZnO has emerged as a promising alternative to Si and GaN in devices like light-emitting diodes (LEDs), photodetectors, and optically pumped lasers for the UV region1-3. ZnO has seve...

Holey 2D nanosheets help make better alkali-ion batteries

Nanotechweb - June 2, 2017 - 7:16am
Nanostructures improve energy-storage devices.

Ionic hydrogel makes ultra-stretchy energy harvester

Nanotechweb - June 1, 2017 - 8:41am
Triboelectric nanogenerator could be used as electronic skin and for tactile sensing.

Recent Advances and New Approaches to High Thermoelectric Efficiency

National Nanomanufacturing Network - May 31, 2017 - 10:55am
Although silicon is mainly associated with microchip devices and advances in computing, the alloy that silicon forms with germanium can be used as a thermoelectric material, which is, in the presen Jaime Andrés Pérez‐Taborda, Institute of Microelectronics of Madrid - CSIC Figure 1. (a) Total world energy consumption sorted by energy source between the period 1990 and 2040. Dotted lines for coal (black) and renewables (green) show the predicted effects of the USA Clean Power Plan (CPP) regulation. (b) World net electricity generation predictions sorted by energy source, for the period of 2012–2040. Both figures are reprinted with permission from Ref. [3]. Copyright 2016.

New metamaterial-enhanced MRI technique tested on humans

Nanotech-Now - May 31, 2017 - 7:45am
Scientists from the Netherlands and Russia designed and tested a new metasurface-based technology for enhancing the local sensitivity of MRI scanners on humans for the first time. The metasurface cons...

Controlling 3-D behavior of biological cells using laser holographic techniques

Nanotech-Now - May 31, 2017 - 7:45am
A research team led by Professor YongKeun Park of the Physics Department at KAIST has developed an optical manipulation technique that can freely control the position, orientation, and shape of micros...

Unveiling the quantum necklace: Researchers simulate quantum necklace-like structures in superfluids

Nanotech-Now - May 31, 2017 - 7:45am
The quantum world is both elegant and mysterious. It is a sphere of existence where the laws of physics experienced in everyday life are broken--particles can exist in two places at once, they can rea...

Researchers find new way to control light with electric fields

Nanotech-Now - May 31, 2017 - 7:45am
Researchers from North Carolina State University have discovered a technique for controlling light with electric fields.

SCCS Issues Final Opinion on Additional Coatings for Titanium Dioxide (Nano Form) as UV-Filter in Dermally Applied Cosmetic Products

InterNano Industry News - May 31, 2017 - 3:45am
On March 7, 2017, the Scientific Committee on Consumer Safety (SCCS) issued a final opinion on additional coatings for titanium dioxide (nano form) coated with cetyl phosphate, manganese dioxide, or triethoxycaprylylsilane as an ultraviolet (UV)-filter in dermally applied cosmetics.  The conclusion states that given a general lack of dermal absorption and low general toxicity of nano-forms of titanium dioxide, SCCS considers that the use of the three titanium dioxide nanomaterials, coated with either cetyl phosphate, manganese dioxide, or triethoxycaprylylsilane, can be considered safe for use in cosmetic products intended for application on healthy, intact, or sunburned skin.  SCCS notes that the ingredients used in some types of products (e.g., in lipsticks) may be incidentally ingested.  The potential harmful effects of manganese dioxide should therefore be taken into account if the manganese dioxide-coated nanomaterials are to be used for applications that could lead to oral ingestion.  The opinion does not apply to applications that might lead to exposure of the consumer’s lungs to the titanium dioxide nanoparticles through the inhalation route (such as powders or sprayable products).  SCCS states that if any new evidence emerges in the future to show that the titanium dioxide nanoparticles used in a sunscreen formulation can penetrate skin to reach viable cells, then it may consider revising this assessment.  SCCS notes that the opinion does not consider the potential ecotoxicological impacts of nano titanium dioxide when released into the environment.  As reported in our March 14, 2017, blog item, SCCS has begun a public consultation on its opinion on titanium dioxide (nano form) as UV-filter in sprays.  The public consultation will end May 14, 2017.
Categories: Nanotechnology News

Freestanding hierarchical porous carbon film derived from hybrid nanocellulose for high-power supercapacitors

InterNano Industry News - May 31, 2017 - 3:45am
Abstract Nanocellulose is a sustainable and eco-friendly nanomaterial derived from renewable biomass. In this study, we utilized the structural advantages of two types of nanocellulose and fabricated freestanding carbonized hybrid nanocellulose films as electrode materials for supercapacitors. The long cellulose nanofibrils (CNFs) formed a macroporous framework, and the short cellulose nanocrystals were assembled around the CNF framework and generated micro/mesopores. This two-level hierarchical porous structure was successfully preserved during carbonization because of a thin atomic layer deposited (ALD) Al2O3 conformal coating, which effectively prevented the aggregation of nanocellulose. These carbonized, partially graphitized nanocellulose fibers were interconnected, forming an integrated and highly conductive network with a large specific surface area of 1,244 m2·g–1. The two-level hierarchical porous structure facilitated fast ion transport in the film. When tested as an electrode material with a high mass loading of 4 mg·cm–2 for supercapacitors, the hierarchical porous carbon film derived from hybrid nanocellulose exhibited a specific capacitance of 170 F·g–1 and extraordinary performance at high current densities. Even at a very high current of 50 A·g–1, it retained 65% of its original specific capacitance, which makes it a promising electrode material for high-power applications.
Categories: Nanotechnology News

Rapid growth of angle-confined large-domain graphene bicrystals

InterNano Industry News - May 31, 2017 - 3:45am
Abstract In the chemical vapor deposition growth of large-area graphene polycrystalline thin films, the coalescence of randomly oriented graphene domains results in a high density of uncertain grain boundaries (GBs). The structures and properties of various GBs are highly dependent on the misorientation angles between the graphene domains, which can significantly affect the performance of the graphene films and impede their industrial applications. Graphene bicrystals with a specific type of GB can be synthesized via the controllable growth of graphene domains with a predefined lattice orientation. Although the bicrystal has been widely investigated for traditional bulk materials, no successful synthesis strategy has been presented for growing two-dimensional graphene bicrystals. In this study, we demonstrate a simple approach for growing well-aligned large-domain graphene bicrystals with a confined tilt angle of 30° on a facilely recrystallized single-crystal Cu (100) substrate. Control of the density of the GBs with a misorientation angle of 30° was realized via the controllable rapid growth of subcentimeter graphene domains with the assistance of a cooperative catalytic surface-passivation treatment. The large-area production of graphene bicrystals consisting of the sole specific GBs with a tunable density provides a new material platform for fundamental studies and practical applications.
Categories: Nanotechnology News

Curved copper nanowires-based robust flexible transparent electrodes via all-solution approach

InterNano Industry News - May 31, 2017 - 3:45am
Abstract Curved Cu nanowire (CCN)-based high-performance flexible transparent conductive electrodes (FTCEs) were fabricated via a fully solution-processed approach, involving synthesis, coating, patterning, welding, and transfer. Each step involved an innovative technique for completing the all-solution processes. The high-quality and well-dispersed CCNs were synthesized using a multi-polyol method through the synergistic effect of specific polyol reduction. To precisely control the optoelectrical properties of the FTCEs, the CCNs were uniformly coated on a polyimide (PI) substrate via a simple meniscus-dragging deposition method by tuning several coating parameters. We also employed a polyurethane (PU)-stamped patterning method to effectively produce 20 μm patterns on CCN thin films. The CCN thin films exhibited high electrical performance, which is attributed to the deeply percolated CCN network formed via a solvent-dipped welding method. Finally, the CCN thin films on the PI substrate were partially embedded and transferred to the PU matrix to reduce their surface roughness. Through consecutive processes involving the proposed methods, a highly percolated CCN thin film on the PU matrix exhibited high optoelectrical performance (R s = 53.48 Ω/□ at T = 85.71%), excellent mechanical properties (R/R 0 < 1.10 after the 10th repetition of tape peeling or 1,000 bending cycles), and a low root-mean-square surface roughness (R rms = 14.36 nm).
Categories: Nanotechnology News