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Tunable Separation of Single-Walled Carbon Nanotubes by Dual-Surfactant Density Gradient Ultracentrifugation

Pei Zhao1, Erik Einarsson1,2, Georgia Lagoudas3, Junichiro Shiomi1, Shohei Chiashi1, and Shigeo Maruyama1 ()


1 Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
2 Global Center of Excellence for Mechanical Systems Innovation, The University of Tokyo, Tokyo 113-8656, Japan
3 Department of Bioengineering, Rice University, Houston, TX 77005, USA

DOI 10.1007/s12274-011-0118-9

Nano Res. 2011, 4(7): 623每634

Address correspondence to maruyama@photon.t.u-tokyo.ac.jp

We have systematically investigated various parameters involved in the separation of single-walled carbon nanotubes by density gradient ultracentrifugation, and based on our experimental findings demonstrate how these parameters affect the outcome.

    

Thermostable Nitrogen-Doped HTiNbO5 Nanosheets with a High Visible-Light Photocatalytic Activity

Zheng Zhai, Yucheng Huang, Lin Xu, Xiaoyan Yang, Chenhui Hu, Lihong Zhang, Yining Fan, and Wenhua Hou ()
 
Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

DOI 10.1007/s12274-011-0119-8

Nano Res. 2011, 4(7): 635每647

Address correspondence to whou@nju.edu.cn

Thermostable nitrogen-doped HTiNbO5 nanosheets have been synthesized and employed as a novel efficient photocatalyst for the degradation of organic dyes under visible light irradiation.

    

One-Step Electrochemical Approach to the Synthesis of Graphene/MnO2 Nanowall Hybrids

Chengzhou Zhu, Shaojun Guo, Youxing Fang, Lei Han, Erkang Wang, and Shaojun Dong ()


State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

DOI 10.1007/s12274-011-0120-2

Nano Res. 2011, 4(7): 648每657

Address correspondence to dongsj@ciac.jl.cn

We have demonstrated a one-step and effective electrochemical method to synthesize graphene/MnO2 nanowall hybrids (GMHs) via cathodic electrochemical deposition. This simple approach should find practical application in the large-scale production of GMHs.

    

Stable Ultrahigh Specific Capacitance of NiO Nanorod Arrays

Zhiyi Lu, Zheng Chang, Junfeng Liu, and Xiaoming Sun ()
 
State Key Laboratory of Chemical Resource Engineering, P. O. Box 98, Beijing University of Chemical Technology, Beijing 100029, China

DOI 10.1007/s12274-011-0121-1

Nano Res. 2011, 4(7): 658每665

Address correspondence to sunxm@mail.buct.edu.cn

NiO nanorod arrays on Ni foam combine ultrahigh specific capacitance (2018 F/g at 2.27 A/g), high power density (1536 F/g at 22.7 A/g), and good cycling stability (92% retention over 500 cycles), which improves the reversible capacitance record for NiO by 50% or more, reached 80% of the theoretical value, and demonstrated that a three-dimensional regular porous array structure can afford all of these virtues in a supercapacitor.

    

Perpendicularly Self-Oriented and Shape-Controlled L10-FePt Nanorods Directly Synthesized by a Temperature-Modulate Process

Tiago Luis da Silva and Laudemir Carlos Varanda ()


Colloidal Materials Group, Instituto de Qu赤mica de São Carlos, Universidade de São Paulo〞USP, São Carlos, PO Box 780, 13566-590, Brazil

DOI 10.1007/s12274-011-0122-0

Nano Res. 2011, 4(7): 666每674

Address correspondence to lvaranda@iqsc.usp.br

The synthesis and self-assembly of tetragonal phase L10-Fe55Pt45 nanorods with high coercive field is described. Monodisperse nanorods with lengths of 60 ㊣ 5 nm and diameters of 2每3 nm were self-assembled in a perpendicular oriented array onto a substrate surface using hexadecylamine as organic spacer. The self-assembled materials are a strong candidate to solve the problem of random magnetic alignment observed in FePt nanospheres leading to applications in ultrahigh magnetic recording (UHMR) systems capable of achieving a performance of the order of terabits/in2.

    

Graphene-Based Conducting Inks for Direct Inkjet Printing of Flexible Conductive Patterns and Their Applications in Electric Circuits and Chemical Sensors

Lu Huang, Yi Huang (), Jiajie Liang, Xiangjian Wan, and Yongsheng Chen ()
 
Key Laboratory of Functional Polymer Materials and Center for Nanoscale Science & Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China

DOI 10.1007/s12274-011-0123-z

Nano Res. 2011, 4(7): 675每684

Address correspondence to Yongsheng Chen, yschen99@nankai.edu.cn; Yi Huang, yihuang@nankai.edu.cn

Graphene inks have been used to prepare various patterns on different flexible substrates such as commercial paper, poly(ethylene terephthalate) and polyimide with high resolution. These patterns can be used to fabricate flexible electrical circuits and sensors.

    

Monodisperse Upconversion NaYF4 Nanocrystals: Syntheses and Bioapplications

Mingliang Deng, Yingxin Ma, Sheng Huang, Gaofei Hu, and Leyu Wang ()


State Key Laboratory of Chemical Resource Engineering, Chemistry Department, School of Science, Beijing University of Chemical Technology, Beijing 100029, China

DOI 10.1007/s12274-011-0124-y

Nano Res. 2011, 4(7): 685每694

Address correspondence to lywang@mail.buct.edu.cn

Monodisperse multicolor upconverting -phase NaYF4 nanocrystals have been successfully prepared via a newly developed method and applied in upconversion fluorescence imaging of cancer cells.

    

Controllable Synthesis of Co3O4 from Nanosize to Microsize with Large-Scale Exposure of Active Crystal Planes and Their Excellent Rate Capability in Supercapacitors Based on the Crystal Plane Effect

Yu Wang (), Ziyi Zhong, Yang Chen, Cheng Theng Ng, and Jianyi Lin
 
 
Institute of Chemical and Engineering Sciences (ICES), Singapore

DOI 10.1007/s12274-011-0125-x

Nano Res. 2011, 4(7): 695每704

Address correspondence to wang_yu@ices.a-star.edu.sg, prospectwy@gmail.com

Morphologies and structures of Co3O4 have been well controlled from nanorods, nanobelts, to nanosheets with sizes ranging from nanometers to micrometers. The as-synthesized samples exhibit excellent performance when employed in supercapacitors, giving higher capacitance and better rate capability than conventional Co3O4 with nanocubic/nanooctahedral morphology.

    

Production of Graphene Nanospheres by Annealing of Graphene Oxide in Solution

Jian Zheng1,2, Hongtao Liu1,2, Bin Wu1, Yunlong Guo1, Ti Wu1,2, Gui Yu1, Yunqi Liu1 (), and Daoben Zhu1


1 Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2 Graduate University of Chinese Academy of Sciences, Beijing 100039, China

DOI 10.1007/s12274-011-0126-9

Nano Res. 2011, 4(7): 705每711

Address correspondence to liuyq@iccas.ac.cn

We report a simple method to produce graphene nanospheres by annealing graphene oxide solution at high temperature with the assistance of sparks induced by the absorption of microwaves by graphite flakes added to the solution.

    

Scanning Tunneling Microscope Observations of Non-AB Stacking of Graphene on Ni Films

Ruiqi Zhao1,2, Yanfeng Zhang1,3 (), Teng Gao1, Yabo Gao1, Nan Liu1, Lei Fu1, and Zhongfan Liu1 () 
 
1 Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
2 College of Physics and Chemistry, Henan Polytechnic University, Henan 454003, China
3 Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China

DOI 10.1007/s12274-011-0127-8

Nano Res. 2011, 4(7): 712每721

Address correspondence to Yanfeng Zhang, yanfengzhang@pku.edu.cn; Zhongfan Liu, zfliu@pku.edu.cn

Atomic-scale structures of graphene segregated on Ni films prior to chemical transfer〞including carbon lattices, Moir谷 patterns due to non-AB stacking, as well as wrinkles and ripples caused by strain effects〞have been characterized by high-resolution scanning tunneling microscopy (STM). The non-AB stacking characteristics of bilayer graphene were quantitatively established by measuring the Moir谷 periods and the relative rotation angles in the two carbon layers.

    

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