Tuning the electronic properties of ZnO nanowire field effect transistors via surface functionalization

Using in situ field effect transistor (FET) characterization combined with the molecular beam epitaxy technique, we demonstrate a significant depletion of electron charge carriers in single zinc oxide (ZnO) nanowire through the surface modification with molybdenum trioxide (MoO 3 ) and 1, 4, 5, 8, 9, 11-hexaazatriphenylene hexacarbonitrile (HATCN) layers. The electron mobility of ZnO nanowire was found to sharply decrease after the surface modification with MoO 3 ; in contrast, the electron mobility significantly increased after functionalization with HATCN layers. Such depletion of n-type conduction originates from the interfacial charge transfer, corroborated by in situ photoelectron spectroscopy studies. The air exposure effect on MoO 3 - and HATCN-coated ZnO nanowire devices was also investigated.

Cheng Han, Du Xiang, Minrui Zheng, Jiadan Lin, Jianqiang Zhong, Chorng Haur Sow and Wei Chen

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Sudden stoppage of rotor in a thermally driven rotary motor made from double-walled carbon nanotubes

In a thermally driven rotary motor made from double-walled carbon nanotubes, the rotor (inner tube) can be actuated to rotate within the stator (outer tube) when the environmental temperature is high enough. A sudden stoppage of the rotor can occur when the inner tube has been actuated to rotate at a stable high speed. To find the mechanisms of such sudden stoppages, eight motor models with the same rotor but different stators are built and simulated in the canonical NVT ensembles. Numerical results demonstrate that the sudden stoppage of the rotor occurs when the difference between radii is near 0.34 nm at a high environmental temperature. A smaller difference between radii does not imply easier activation of the sudden rotor stoppage. During rotation, the positions and electron density distribution of atoms at the ends of the motor show that a sp 1 bonded atom on the rotor is attracted by the sp 1 atom with the biggest deviation of radial position on the sta...

K Cai, J Z Yu, H Yin and Q H Qin

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Nanophotonics and plasmonics: a great look for the International Year of Light

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Anna Demming

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Analytical characterization using surface-enhanced Raman scattering (SERS) and microfluidic sampling

With the rapid development of analytical techniques, it has become much easier to detect chemical and biological analytes, even at very low detection limits. In recent years, techniques based on vibrational spectroscopy, such as surface enhanced Raman spectroscopy (SERS), have been developed for non-destructive detection of pathogenic microorganisms. SERS is a highly sensitive analytical tool that can be used to characterize chemical and biological analytes interacting with SERS-active substrates. However, it has always been a challenge to obtain consistent and reproducible SERS spectroscopic results at complicated experimental conditions. Microfluidics, a tool for highly precise manipulation of small volume liquid samples, can be used to overcome the major drawbacks of SERS-based techniques. High reproducibility of SERS measurement could be obtained in continuous flow generated inside microfluidic devices. This article provides a thorough review of the principles, concepts and m...

Chao Wang and Chenxu Yu

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Sub-nanometer dimensions control of core/shell nanoparticles prepared by atomic layer deposition

Bimetallic core/shell nanoparticles (NPs) are the subject of intense research due to their unique electronic, optical and catalytic properties. Accurate and independent control over the dimensions of both core and shell would allow for unprecedented catalytic performance. Here, we demonstrate that both core and shell dimensions of Pd/Pt core/shell nanoparticles (NPs) supported on Al 2 O 3 substrates can be controlled at the sub-nanometer level by using a novel strategy based on atomic layer deposition (ALD). From the results it is derived that the main conditions for accurate dimension control of these core/shell NPs are: (i) a difference in surface energy between the deposited core metal and the substrate to obtain island growth; (ii) a process yielding linear growth of the NP cores with ALD cycles to obtain monodispersed NPs with a narrow size distribution; (iii) a selective ALD process for the shell metal yielding a linearly increasing thickness to obtain co...

M J Weber, M A Verheijen, A A Bol and W M M Kessels

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A flexible anisotropic self-powered piezoelectric direction sensor based on double sided ZnO nanowires configuration

We have successfully synthesized highly dense and well aligned zinc oxide nanowires (NWs) on the two sides of a PEDOT: PSS substrate by a single step low temperature hydrothermal method. The grown sample was used to fabricate a double sided piezoelectric nanogenerator (NG). The maximum harvested output power density from the fabricated double sided NG configuration was about 4.44 mW cm −2 . The results obtained from the present double sided NG were approximately double the output from a single side. In addition to that, the voltage polarity of the harvested voltage from the two sides of the NG has been investigated. The results showed that upon bending, an anisotropic voltage polarity is generated on the two sides. Indicating that, this double sided NG can be used as a self-powered voltage polarity based direction sensor. The results of the present flexible double sided NG is very promising for harvesting energy from irregular mechanical energy sources in the surrounding...

E S Nour, C O Chey, M Willander and O Nur

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Structure of the Ice–Clathrate Interface

The Journal of Physical Chemistry C

DOI: 10.1021/jp511749q

Andrew H. Nguyen, Matthew A. Koc, Tricia D. Shepherd and Valeria Molinero

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NO Decomposition Activated by Preadsorption of O2 onto Copper Cluster Anions

The Journal of Physical Chemistry C

DOI: 10.1021/jp510190e

Shinichi Hirabayashi and Masahiko Ichihashi

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Passivation versus Oxidation of Iron Catalyst with Carbon Dioxide

The Journal of Physical Chemistry C

DOI: 10.1021/jp508404m

Ewa Ekiert and Walerian Arabczyk

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Understanding the Interaction of the Carbonates and Binder in Na-Ion Batteries: A Combined Bulk and Surface Study

Chemistry of Materials

DOI: 10.1021/cm5039649

Leonie O. Vogt, Mario El Kazzi, Erik Jämstorp Berg, Sofía Pérez Villar, Petr Novák and Claire Villevieille

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Photocatalytic Carbon Dioxide Reduction by Copper Oxide Nanocluster-Grafted Niobate Nanosheets

ACS Nano

DOI: 10.1021/nn507429e

Ge Yin, Masami Nishikawa, Yoshio Nosaka, Nagarajan Srinivasan, Daiki Atarashi, Etsuo Sakai and Masahiro Miyauchi

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Cost-Effective Scalable Synthesis of Mesoporous Germanium Particles via a Redox-Transmetalation Reaction for High-Performance Energy Storage Devices

ACS Nano

DOI: 10.1021/acsnano.5b00389

Sinho Choi, Jieun Kim, Nam-Soon Choi, Min Gyu Kim and Soojin Park

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Enhancement of Local Piezoresponse in Polymer Ferroelectrics via Nanoscale Control of Microstructure

ACS Nano

DOI: 10.1021/nn5067232

Yoon-Young Choi, Pankaj Sharma, Charudatta Phatak, David J. Gosztola, Yunya Liu, Joonseok Lee, Byeongdu Lee, Jiangyu Li, Alexei Gruverman, Stephen Ducharme and Seungbum Hong

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Nanoscale Control of Surface Immobilized BMP-2: Toward a Quantitative Assessment of BMP-Mediated Signaling Events

Nano Letters

DOI: 10.1021/acs.nanolett.5b00315

Elisabeth H. Schwab, Theresa L. M. Pohl, Tamás Haraszti, Gerburg K. Schwaerzer, Christian Hiepen, Joachim P. Spatz, Petra Knaus and Elisabetta A. Cavalcanti-Adam

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Intrinsic Disorder in Graphene on Transition Metal Dichalcogenide Heterostructures

Nano Letters

DOI: 10.1021/nl5047736

Matthew Yankowitz, Stefano Larentis, Kyounghwan Kim, Jiamin Xue, Devin McKenzie, Shengqiang Huang, Marina Paggen, Mazhar N. Ali, Robert J. Cava, Emanuel Tutuc and Brian J. LeRoy

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Ultrafast and Directional Diffusion of Lithium in Phosphorene for High-Performance Lithium-Ion Battery

Nano Letters

DOI: 10.1021/nl504336h

Weifeng Li, Yanmei Yang, Gang Zhang and Yong-Wei Zhang

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Assembly of Extra-Large Nanosheets by Supramolecular Polymerization of Amphiphilic Pyrene Oligomers in Aqueous Solution

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b00047

Mykhailo Vybornyi, Alexander Rudnev and Robert Häner

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Exceptional Gas Adsorption Properties by Nitrogen-Doped Porous Carbons Derived from Benzimidazole-Linked Polymers

Chemistry of Materials

DOI: 10.1021/cm504435m

Babak Ashourirad, Ali Kemal Sekizkardes, Suha Altarawneh and Hani M. El-Kaderi

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Thin Films of Molybdenum Disulfide Doped with Chromium by Aerosol-Assisted Chemical Vapor Deposition (AACVD)

Chemistry of Materials

DOI: 10.1021/cm504532w

David J. Lewis, Aleksander A. Tedstone, Xiang Li Zhong, Edward A. Lewis, Aidan Rooney, Nicky Savjani, Jack R. Brent, Sarah J. Haigh, M. Grace Burke, Christopher A. Muryn, James M. Raftery, Chris Warrens, Kevin West, Sander Gaemers and Paul O’Brien

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Microwave-Assisted Synthesis of CdS/ZnS:Cu Quantum Dots for White Light-Emitting Diodes with High Color Rendition

Chemistry of Materials

DOI: 10.1021/cm503770w

Tong-Tong Xuan, Jia-Qing Liu, Rong-Jun Xie, Hui-Li Li and Zhuo Sun

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