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Separation of Gold Nanorods Using Density Gradient Ultracentrifugation

Shuai Li, Zheng Chang, Junfeng Liu (), Lu Bai, Liang Luo, and Xiaoming Sun ()

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Contributed equally to this work

DOI 10.1007/s12274-011-0128-7

Nano Res. 2011, 4(8): 723每728

Address correspondence to Junfeng Liu, ljf@mail.buct.edu.cn; Xiaoming Sun, sunxm@mail.buct.edu.cn

A simple and efficient method has been developed to obtain nearly monodisperse Au nanorods with finely-tuned aspect ratios using the density gradient ultracentrifugation separation method. Separated Au NRs have size-dependent plasmon resonance peaks which lead to different surface-enhanced Raman scattering properties. This separation approach may also be extended to other rod-like nanomaterials in appropriate gradient media.

    

Advanced Asymmetrical Supercapacitors Based on Graphene Hybrid Materials

Hailiang Wang, Yongye Liang, Tissaphern Mirfakhrai, Zhuo Chen, Hernan Sanchez Casalongue, and Hongjie Dai ()
 
Department of Chemistry, Stanford University, Stanford, CA 94305, USA

DOI 10.1007/s12274-011-0129-6

Nano Res. 2011, 4(8): 729每736

Address correspondence to hdai@stanford.edu

Asymmetrical supercapacitors have been fabricated by coupling a Ni(OH)2/graphene electrode with a RuO2/graphene electrode. Growth of Ni(OH)2 and RuO2 nanocrystals on high quality graphene sheets affords high-performance hybrid materials for supercapacitors, and the combination of the two materials leads to asymmetrical supercapacitors with high energy and power densities for energy storage applications.

    

Optical Properties of SiO2 and ZnO Nanostructured Replicas of Butterfly Wing Scales

Zhe Xu1, Ke Yu1 (), Bo Li1, Rong Huang1, Ping Wu2, Huibing Mao1, Na Liao1, and Ziqiang Zhu1


1 Key Laboratory of Polar Materials and Devices (Ministry of Education of China), Department of Electronic Engineering, East China Normal University, Shanghai 200241, China
2 Department of Physics, East China Normal University, Shanghai 200241, China

DOI 10.1007/s12274-011-0130-0

Nano Res. 2011, 4(8): 737每745

Address correspondence to yk5188@263.net

Methods of fabrication of SiO2 and ZnO inverse structure replicas of butterfly wings are reported. The SiO2 replica can be regarded as a special optical component and the ZnO replica has the potential to be used in photoelectron devices.

    

Electrochemical Characterization of a Porous Pt Nanoparticle ※Nanocube-Mosaic§ Prepared by a Modified Polyol Method with HCl Addition

Randy Jalem, Ryosuke Koike, Yong Yang†, Masanobu Nakayama, and Masayuki Nogami ()
 
Department of Materials Science and Engineering, Nagoya Institute of Technology, Showa, Nagoya, 466-8555, Japan
Present address : Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China

DOI 10.1007/s12274-011-0131-z

Nano Res. 2011, 4(8): 746每758

Address correspondence to nogami@nitech.ac.jp

The formation of single crystalline porous platinum nano¬particles, which is ensured by tailoring the reaction conditions, is reflected in their high catalytic activity towards methanol electro-oxidation.

    

Ultra-Thin Double-Walled Carbon Nanotubes: A Novel Nanocontainer for Preparing Atomic Wires

Lei Shi1, Leimei Sheng1 (), Liming Yu1, Kang An1, Yoshinori Ando2, and Xinluo Zhao1 ()


1 Department of Physics, and Institute of Low-Dimensional Carbons and Device Physics, Shanghai University, Shanghai 200444, China
2 Department of Materials Science and Engineering, Meijo University, Nagoya 468-8502, Japan

DOI 10.1007/s12274-011-0132-y

Nano Res. 2011, 4(8): 759每766

Address correspondence to Leimei Sheng, shenglm@staff.shu.edu.cn; Xinluo Zhao, xlzhao@shu.edu.cn

Double-walled carbon nanotubes (DWCNTs) with high graphitization and an average inner diameter of 0.9 nm and outer diameter of 1.6 nm have been produced on a large scale. These high purity, uniform and ultra-thin DWCNTs are a novel nanocontainer for preparing atomic wires, such as long linear carbon chains, and a good candidate for various applications in nanodevices.

    

In Situ TEM Observation of the Gasification and Growth of Carbon Nanotubes Using Iron Catalysts

Xiaofeng Feng1,3, See Wee Chee2,4, Renu Sharma2,5, Kai Liu1, Xu Xie1,6, Qunqing Li1, Shoushan Fan1, and Kaili Jiang1 ()
 
1 Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China
2 Leroy Eyring Center for Solid State Science, Arizona State University, Tempe, AZ 85287, USA
3 Present address: Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
4 Present Address: Department of Materials Science and Engineerig, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
5 Present address: National Institute of Science and Technology, Gaithersburg, MD 20899, USA
6 Present address: Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

DOI 10.1007/s12274-011-0133-x

Nano Res. 2011, 4(8): 767每779

Address correspondence to JiangKL@tsinghua.edu.cn

According to in situ high resolution TEM observations, the catalytic gasification and growth of carbon nanotubes can be easily controlled by switching off and on the precursor gas respectively.

    

Synthesis of Monodisperse CoPt3 Nanocrystals and Their Catalytic Behavior for Growth of Boron Nanowires

Yuan Tian1, Chengmin Shen1, Chen Li1, Xuezhao Shi1,2, Yuan Huang1, and Hongjun Gao1 ()

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 College of Chemistry and Engineering, Lanzhou University, Lanzhou 730000, China

DOI 10.1007/s12274-011-0134-9

Nano Res. 2011, 4(8): 780每787

Address correspondence to hjgao@iphy.ac.cn

Ellipsoidal monodisperse CoPt3 nanocrystals have been synthesized by a solvothermal method and used as catalysts to prepare large-area boron nanowires with diameters ranging from 30 to 50 nm and good field emission characteristics.

    

Polarized Light Microscopy and Spectroscopy of Individual Single-Walled Carbon Nanotubes

Jacques Lefebvre () and Paul Finnie ()
 
Institute for Microstructural Sciences, National Research Council, Ottawa, Canada K1A 0R6

DOI 10.1007/s12274-011-0135-8

Nano Res. 2011, 4(8): 788每794

Address correspondence to Jacques Lefebvre, jacques.lefebvre@nrc.ca; Paul Finnie, Paul.Finnie@nrc.ca

A single carbon nanotube inserted between a polarizer/analyser pair can be imaged in dark field using its strong birefringence.

    

Ionic Liquid-Assisted One-Step Hydrothermal Synthesis of TiO2-Reduced Graphene Oxide Composites

Jianfeng Shen, Min Shi, Bo Yan, Hongwei Ma, Na Li, and Mingxin Ye ()


Center of Special Materials and Technology, Fudan University, Shanghai, 200433, China

DOI 10.1007/s12274-011-0136-7

Nano Res. 2011, 4(8): 795每806

Address correspondence to mxye@fudan.edu.cn

A facile and efficient strategy for the preparation of TiO2每reduced graphene oxide (TiO2每RGO) composites using a modified one-pot hydrothermal method has been demonstrated. The resulting TiO2每RGO composites exhibited excellent photocatalysis of hydrogen evolution.

    

Tailoring the Diameter of Single-Walled Carbon Nanotubes for Optical Applications

Ying Tian1, Marina Y. Timmermans1, Samuli Kivistö2, Albert G. Nasibulin() , Zhen Zhu1, Hua Jiang1, Oleg G. Okhotnikov2, and Esko I. Kauppinen()
 
1 NanoMaterials Group, Department of Applied Physics and Center for New Materials, Aalto University, Espoo, 00076, Finland
2 Optoelectronics Research Centre, Tampere University of Technology, P. O. Box 692, Tampere, 33101, Finland

DOI 10.1007/s12274-011-0137-6

Nano Res. 2011, 4(8): 807每815

Address correspondence to Albert G. Nasibulin, albert.nasibulin@aalto.fi; Esko I. Kauppinen, esko.kauppinen@hut.fi

CO2 as an etching agent etches carbon nanotube embryos with high curvature due to the inverse Boudouard reaction, subsequently suppressing the growth of small diameter tubes. The noticeable shift of the absorption peaks reveals that the diameters of the resulting single-walled carbon nanotubes are efficiently altered from 1.2 to 1.9 nm with increasing CO2 concentration.

    

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