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Photothermoelectric Effects in Single-Walled Carbon Nanotube Films: Reinterpreting Scanning Photocurrent Experiments

Benoit C. St-Antoine1, David M谷nard1 (), and Richard Martel2 ()


1 Regroupement Quebecois sur les Materiaux de Pointe (RQMP) and Department of Engineering Physics, École Polytechnique de Montr谷al, Montr谷al QC H3C 3A7, Canada
2 Regroupement Quebecois sur les Materiaux de Pointe (RQMP) and Department of Chemistry, Universit谷 de Montr谷al, Montr谷al QC H3T 1J4, Canada

DOI 10.1007/s12274-011-0186-x

Nano Res. 2012, 5(2): 73每81

Address correspondence to David M谷nard, david.menard@polymtl.ca; Richard Martel, r.martel@umontreal.ca

This work demonstrates that the position-dependent photoresponse of single-walled carbon nanotube (SWNT) films deposited on a glass substrate arises mainly from photothermoelectric effects.

    

Studies of Graphene-Based Nanoelectromechanical Switches

Zhiwen Shi1, Hongliang Lu1, Lianchang Zhang1, Rong Yang1, Yi Wang1, Donghua Liu1, Haiming Guo1, Dongxia Shi1, Hongjun Gao1, Enge Wang2, and Guangyu Zhang1()
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2International Centre of Quantum Materials, School of Physics, Peking University, Beijing 100871, China

DOI 10.1007/s12274-011-0187-9

Nano Res. 2012, 5(2): 82每87

Address correspondence to gyzhang@aphy.iphy.ac.cn

Electromechanical switch devices employing suspended graphene as movable elements have been developed. Their on and off states can be controlled by modulating the electrostatic force applied to the graphene. The devices exhibit on每off ratios of up to 104 and lifetimes of over 500 cycles. The prototype device demonstrates the feasibility of using multilayer graphene in electromechanical systems.

    

Charge Transfer and Retention in Directly Coupled Au每CdSe Nanohybrids

Bo Gao1, Yue Lin1, Sijie Wei1, Jie Zeng1,2, Yuan Liao1, Liuguo Chen1, David Goldfeld2, Xiaoping Wang1, Yi Luo1, Zhenchao Dong1 (), and Jianguo Hou1 ()


1 Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China, Hefei, Anhui 230026, China
2 Department of Biomedical Engineering, Washington University, St. Louis, MO 63130, USA

DOI 10.1007/s12274-011-0188-8

Nano Res. 2012, 5(2): 88每98

Address correspondence to Zhenchao Dong, zcdong@ustc.edu.cn; Jianguo Hou, jghou@ustc.edu.cn

The charge transfer and retention behavior of directly coupled Au每CdSe nanohybrids has been studied by time-resolved photoluminescence. The fastest decay channel for the nanohybrids was found to correlate with the charge transfer from CdSe to Au nanoparticles, and photocatalytic experiments using methylene blue molecules show that the charge can be effectively retained in the Au nanoparticles for a timescale of hours.

    

Layer-by-Layer Removal of Insulating Few-Layer Mica Flakes for Asymmetric Ultra-Thin Nanopore Fabrication

Jun Gao1, Wei Guo1 (), Hua Geng1, Xu Hou1, Zhigang Shuai2, and Lei Jiang1, 3 ()


1 Beijing National Laboratory for Molecular Sciences (BNLMS), and Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2 Department of Chemistry, Tsinghua University, Beijing 100084, China
3 School of Chemistry and Environment, Beihang University, Beijing 100191, China

DOI 10.1007/s12274-011-0189-7

Nano Res. 2012, 5(2): 99每108

Address correspondence to Wei Guo, wguo@iccas.ac.cn; Lei Jiang, jianglei@iccas.ac.cn

In both solid and suspended few-layer mica membranes, solid-state nanopores have been micromechanically fabricated by layer-by-layer removal of mica monolayers with atomic force microscopy. The ultra-thin nanopores are geometrically asymmetric, like an inverted quadrangular frustum pyramid. The nanopore geometry can be well-controlled by finely tuning the fabrication parameters.

    

Functionalization of Silicon Nanowire Surfaces with Metal每Organic Frameworks

Nian Liu1, Yan Yao2, Judy J. Cha2, Matthew T. McDowell2, Yu Han3, and Yi Cui2,4 ()


1 Department of Chemistry, Stanford University, Stanford, California 94305, USA
2 Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
3 Advanced Membrane and Porous Materials Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
4 Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA

DOI 10.1007/s12274-011-0190-1

Nano Res. 2012, 5(2): 109每116

Address correspondence to yicui@stanford.edu

Silicon nanowires (SiNWs) have been successfully functionalized with metal每organic frameworks (MOFs) at room temperature by a step-by-step approach. The matching of the SiNW surface groups and the MOF coordinating groups is crucial for the conformal growth of MOFs on SiNWs. Furthermore, the morphology of the composite can easily be tuned by adjusting the solution concentration, immersion time, and growth temperature.

    

Is Graphene Aromatic?

Ivan A. Popov1, Konstantin V. Bozhenko2 (), and Alexander I. Boldyrev1 ()


1 Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322, USA
2 Department of Physical and Colloid Chemistry, Peoples* Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation

DOI 10.1007/s12274-011-0192-z

Nano Res. 2012, 5(2): 117每123

Address correspondence to Konstantin V. Bozhenko, kbogenko@mail.ru; Alexander I. Boldyrev, a.i.boldyrev@usu.edu

Using adaptive natural density partitioning analysis we prove that graphene is aromatic, but its aromaticity is different from the aromaticity in benzene, coronene, or circumcoronene. Aromaticity in graphene is local with two-electrons delocalized over every hexagon ring.

    

Multiplexed Dot Immunoassay Using Ag Nanocubes, Au/Ag Alloy Nanoparticles, and Au/Ag Nanocages

Elizaveta Panfilova1, Alexander Shirokov1, Boris Khlebtsov1,2 (), Larisa Matora1,2, and Nikolai Khlebtsov1,2


 

1 Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russian Federation
2 Saratov State University, 83 Ulitsa Astrakhanskaya, Saratov 410012, Russian Federation

DOI 10.1007/s12274-011-0193-6

Nano Res. 2012, 5(2): 124每134

Address correspondence to bkhl@ibppm.sgu.ru

We report the first application of Ag nanocubes, Au/Ag alloy nanoparticles, and Au/Ag nanocages in a multiplexed dot immunoassay. The assay principle is based on the simultaneous staining of analyte drops on a nitrocellulose membrane strip by using multicolor nanoparticles conjugated with biospecific probing molecules.

    

Controlled synthesis of porous Ag/Au bimetallic hollow nanoshells with tunable plasmonic and catalytic properties

Haoxi Wu1,2, Ping Wang1, Haili He1,2, and Yongdong Jin1 ()


1 State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun
130022, China
2 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China

DOI 10.1007/s12274-012-0194-5

Nano Res. 2012, 5(2): 135每144

Address correspondence to ydjin@ciac.jl.cn

A facile synthesis of Ag/Au bimetallic hollow and porous nanoshells (HPNSs) with tunable optical resonance (from the visible to the near infrared (NIR) window) and catalytic properties is reported. The synthesis involves a two-step aqueous-phase method, using polycrystalline silver nanoparticles as starting templates and hydrogen peroxide as an etchant. The morphology (porosity) of the HPNSs plays a key role in the catalysis of the reduction of p-nitrophenol to p-aminophenol by NaBH4.

    

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