Contact properties of field-effect transistors based on indium arsenide nanowires thinner than 16 nm

With the scaling down of field effect transistors (FETs) to improve performance, the contact between the electrodes and the channel becomes more and more important. Contact properties of FETs based on ultrathin InAs NWs (with the diameter ranging from sub-7 nm to 16 nm) are investigated here. Chromium (Cr) and nickel (Ni) are proven to form ohmic contact with the ultrathin InAs NWs, in contrast to a recent report (Razavieh A et al ACS Nano 8 [http://ift.tt/1a8UNyz] 6281 ). Furthermore, the contact resistance is found to depend on the NW diameter and the contact metals, which between Cr and InAs NWs increases more rapidly than that between Ni and InAs NWs when the NW diameter decreases. The origins of the contact resistance difference for the two kinds of metals are studied and Ni x InAs is believed to play an important role. Based on our results, it is advantageous to use Ni as contact metal for ultrathin NWs. We also observ...

Tuanwei Shi, Mengqi Fu, Dong Pan, Yao Guo, Jianhua Zhao and Qing Chen

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Atomic layer deposition of Y 2 O 3 on h -BN for a gate stack in graphene FETs

The combination of h -BN and high- k dielectrics is required for a top gate insulator in miniaturized graphene field-effect transistors because of the low dielectric constant of h -BN. We investigated the deposition of Y 2 O 3 on h -BN using atomic layer deposition. The deposition of Y 2 O 3 on h -BN was confirmed without any buffer layer. An increase in the deposition temperature reduced the surface coverage. The deposition mechanism could be explained by the competition between the desorption and adsorption of the Y precursor on h -BN due to the polarization. Although a full surface coverage was difficult to achieve, the use of an oxidized metal seeding layer on h -BN resulted in a full surface coverage.

N Takahashi, K Watanabe, T Taniguchi and K Nagashio

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Solution phase synthesis and intense pulsed light sintering and reduction of a copper oxide ink with an encapsulating nickel oxide barrier

Copper oxide nanoparticle inks sintered and reduced by intense pulsed light (IPL) are an inexpensive means to produce conductive patterns on a number of substrates. However, the oxidation and diffusion characteristics of copper are issues that must be resolved before it can be considered as a viable solution. Nickel can provide a degree of oxidation protection and act as a barrier for the diffusion of copper. In the present study we have for the first time synthesized copper oxide with an encapsulating nickel oxide nanostructure using a solution phase synthesis process in the presence of a surfactant at room temperature. The room temperature process enables us to easily prevent the formation of alloys at the copper–nickel interface. The synthesis results in a simple technique (easily commercializable, tested at a 10 g scale) with highly controllable layer thicknesses on a 20 nm copper oxide nanoparticle. These Cu 2 O@NiO dispersions were then directly deposited onto subs...

M Jha, R Dharmadasa, G L Draper, A Sherehiy, G Sumanasekera, D Amos and T Druffel

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Electrophoretic deposition and characterization of nanocomposites and nanoparticles on magnesium substrates

This study introduces a triphasic design of biodegradable materials composed of nanophase hydroxyapatite (nHA), poly(lactic-co-glycolic acid) (PLGA), and magnesium (Mg) substrates for musculoskeletal implant applications. Specifically, nHA_PLGA composites and nHA nanoparticles were synthesized, deposited on three-dimensional Mg substrates using electrophoretic deposition (EPD), and characterized. The three components involved, that is, nHA, PLGA, and Mg are all biodegradable in the human body, thus promising for biodegradable implant and device applications. Mg and its alloys are attractive for musculoskeletal implant applications due to their comparable modulus and strength to cortical bone. Controlling the interface of Mg with the biological environment, however, is the key challenge that currently limits this biodegradable metal for broad applications in medical implants. This article particularly focuses on creating nanostructured interface between the biodegradable Mg and su...



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Single CuO nanowires decorated with size-selected Pd nanoparticles for CO sensing in humid atmosphere

We report on conductometric gas sensors based on single CuO nanowires and compare the carbon monoxide (CO) sensing properties of pristine as well as Pd nanoparticle decorated devices in humid atmosphere. Magnetron sputter inert gas aggregation combined with a quadrupole mass filter for cluster size selection was used for single-step Pd nanoparticle deposition in the soft landing regime. Uniformly dispersed, crystalline Pd nanoparticles with size-selected diameters around 5 nm were deposited on single CuO nanowire devices in a four point configuration. During gas sensing experiments in humid synthetic air, significantly enhanced CO response for CuO nanowires decorated with Pd nanoparticles was observed, which validates that magnetron sputter gas aggregation is very well suited for the realization of nanoparticle-functionalized sensors with improved performance.

Stephan Steinhauer, Vidyadhar Singh, Cathal Cassidy, Christian Gspan, Werner Grogger, Mukhles Sowwan and Anton Köck

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Enhanced Electroresponsive Performance of Double-Shell SiO2/TiO2 Hollow Nanoparticles

ACS Nano

DOI: 10.1021/nn5068495

Seungae Lee, Jungsup Lee, Sun Hye Hwang, Juyoung Yun and Jyongsik Jang

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Hybridized Electromagnetic–Triboelectric Nanogenerator for Scavenging Air-Flow Energy to Sustainably Power Temperature Sensors

ACS Nano

DOI: 10.1021/acsnano.5b01187

Xue Wang, Shuhua Wang, Ya Yang and Zhong Lin Wang

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In Vivo Tumor Vasculature Targeting of CuS@MSN Based Theranostic Nanomedicine

ACS Nano

DOI: 10.1021/nn507241v

Feng Chen, Hao Hong, Shreya Goel, Stephen A. Graves, Hakan Orbay, Emily B. Ehlerding, Sixiang Shi, Charles P. Theuer, Robert J. Nickles and Weibo Cai

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Direct Chemical Vapor Deposition Synthesis of Phase-Pure Iron Pyrite (FeS2) Thin Films

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b00664

Leith Samad, Miguel Cabán-Acevedo, Melinda J. Shearer, Kwangsuk Park, Robert J. Hamers and Song Jin

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Symmetry-Breaking Segmented Selenium Nanorods and Nanowires: Synthesis via Coupling of Nanorods

Chemistry of Materials

DOI: 10.1021/cm504522y

Ming-Han Liu, Yu-Tzu Liu and C. R. Chris Wang

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Quenched Phonon Drag in Silicon Nanowires Reveals Significant Effect in the Bulk at Room Temperature

Nano Letters

DOI: 10.1021/acs.nanolett.5b00267

Jyothi Sadhu, Hongxiang Tian, Jun Ma, Bruno Azeredo, Junhwan Kim, Karthik Balasundaram, Chen Zhang, Xiuling Li, P. M. Ferreira and S. Sinha

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Superior Conductive Solid-like Electrolytes: Nanoconfining Liquids within the Hollow Structures

Nano Letters

DOI: 10.1021/acs.nanolett.5b00739

Jinshui Zhang, Ying Bai, Xiao-Guang Sun, Yunchao Li, Bingkun Guo, Jihua Chen, Gabriel M. Veith, Dale K. Hensley, Mariappan Parans Paranthaman, John B. Goodenough and Sheng Dai

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Influence of Magnetic Domain Walls and Magnetic Field on the Thermal Conductivity of Magnetic Nanowires

Nano Letters

DOI: 10.1021/nl502577y

Hao-Ting Huang, Mei-Feng Lai, Yun-Fang Hou and Zung-Hang Wei

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Triangular Gold Nanoplate Growth by Oriented Attachment of Au Seeds Generated by Strong Field Laser Reduction

Nano Letters

DOI: 10.1021/acs.nanolett.5b00709

Behzad Tangeysh, Katharine Moore Tibbetts, Johanan H. Odhner, Bradford B. Wayland and Robert J. Levis

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Pt–Au Nanoparticle Heterodimers as Seeds for Pt–Au–Metal Sulfide Heterotrimers: Thermal Stability and Chemoselective Growth Characteristics

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b01274

Matthew J. Bradley, Carlos G. Read and Raymond E. Schaak

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Hydrated Proton Structure and Diffusion at Platinum Surfaces

The Journal of Physical Chemistry C

DOI: 10.1021/jp5129244

Zhen Cao, Revati Kumar, Yuxing Peng and Gregory A. Voth

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Synthesis and Ultrafast Dynamics of a Donor–Acceptor–Donor Molecule Having Optoelectronic Properties

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b02063

M. V. Niladari Raju, Maneesha Esther Mohanty, Prakriti Ranjan Bangal and Jayathirtha Rao Vaidya

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Scalable Graphene Coatings for Enhanced Condensation Heat Transfer

Nano Letters

DOI: 10.1021/nl504628s

Daniel J. Preston, Daniela L. Mafra, Nenad Miljkovic, Jing Kong and Evelyn N. Wang

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Interchain Helically π-Stacked Assembly of Cationic Chiral Poly(para-phenylene) Derivatives Enforced by Anionic π-Conjugated Molecules through Both Electrostatic and π–π Interactions

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b00121

Kazuyoshi Watanabe, Zemeng Sun and Kazuo Akagi

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Controlled Lithium Dendrite Growth by a Synergistic Effect of Multilayered Graphene Coating and an Electrolyte Additive

Chemistry of Materials

DOI: 10.1021/cm503447u

Joo-Seong Kim, Dae Woo Kim, Hee Tae Jung and Jang Wook Choi

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