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Site-controlled formation of InGaAs quantum nanostructures〞Tailoring the dimensionality and the quantum confinement

Baolai Liang1(), Ping-Show Wong1, Thai Tran2, Vitaliy G. Dorogan3, Yuriy I. Mazur3, Morgan E. Ware3, Gregory J. Salamo3, Chih-Kang Shih2, and Diana L. Huffaker1


1 California NanoSystems Institute, University of California at Los Angeles, CA 90095, USA
2 Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
3 Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA

DOI 10.1007/s12274-013-0299-5

Nano Research 2013, 6(4): 235每242

Address correspondence to bliang@cnsi.ucla.edu

InGaAs quantum disks (QDks) have been controllably formed on the top facet of nano-patterned GaAs pyramidal platforms, demonstrating a transition from zero-dimensional to two-dimensional quantum structures with the increase of QDk size. This transition provides the flexibility to continuously tailor the quantum confinement of nanostructures via site-controlled self-assembled epitaxy.

    

Kinetics-controlled growth of aligned mesocrystalline SnO2 nanorod arrays for lithium-ion batteries with superior rate performance

Shuai Chen, Miao Wang, Jianfeng Ye, Jinguang Cai, Yurong Ma, Henghui Zhou (), and Limin Qi ()


Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University, Beijing 100871, China

DOI 10.1007/s12274-013-0300-3

Nano Research 2013, 6(4): 243每252

Address correspondence to Henghui Zhou, hhzhou@pku.edu.cn; Limin Qi, liminqi@pku.edu.cn

A general method for facile kinetics-controlled solvothermal growth of aligned arrays of mesocrystalline SnO2 nanorods on arbitrary substrates has been developed by employing a unique ternary solvent system. When used as an anode material for lithium-ion batteries, mesocrystalline SnO2 nanorod arrays grown on Ti foil exhibit a reversible capacity of 720 mA﹞h/g at a current rate as high as 10 C.

    

Deriving the three-dimensional structure of ZnO nanowires/nanobelts by scanning transmission electron microscope tomography

Yong Ding1,∫, Fang Zhang1,∫, and Zhong Lin Wang1,2 ()


1 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA
2 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, China
These authors contributed equally.

DOI 10.1007/s12274-013-0301-2

Nano Research 2013, 6(4): 253每262

Address correspondence to zhong.wang@mse.gatech.edu

By using high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM) tomography, we have systematically reconstructed the three-dimensional (3D) structures of ZnO nanowires and nanobelts synthesized via vapor deposition. Further, by combining the 3D structure with its diffraction patterns, the growth direction and side surfaces of the nanowires and nanobelts were identified.

    

Wafer scale direct-write of Ge and Si nanostructures with conducting stamps and a modified mask aligner

Hideki Sato1,2, Stephanie E. Vasko1,3, and Marco Rolandi1 ()


1 Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
2 Japan Patent Office, Tokyo 100-8915, Japan
3 Department of Chemistry, University of Washington, Seattle, WA 98195, USA

DOI 10.1007/s12274-013-0302-1

Nano Research 2013, 6(4): 263每268

Address correspondence to rolandi@uw.edu

We demonstrate inexpensive wafer scale direct-write of Ge and Si nanostructures with a modified mask aligner.

    

Raman scattering study of the phonon dispersion in twisted bilayer graphene

Jessica Campos-Delgado1 (), Luiz G. Cançado2, Carlos A. Achete3, Ado Jorio2, and Jean-Pierre Raskin1


1 Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), Universit谷 catholique de Louvain, Louvain-la-Neuve, 1348, Belgium
2 Departamento de F赤sica, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 30123-970, Brazil
3 Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Xer谷m, RJ, 25250-020, Brazil

DOI 10.1007/s12274-013-0304-z

Nano Research 2013, 6(4): 269每274

Address correspondence to jessica.campos@uclouvain.be

Bilayer graphene samples with different twist angles have been studied by Raman spectroscopy. Our measurements in the 100每1700 cm每1 range reveal the appearance of features that have been successfully assigned to the different phonon branches in the phonon dispersion of graphene.

    

Uniform wurtzite MnSe nanocrystals with surface-dependent magnetic behavior

Jie Zhang1,∫, Fan Zhang2,∫, Xuebing Zhao1, Xinran Wang3, Lifeng Yin4, Chongyun Liang2, Min Wang1, Ying Li1, Jiwei Liu1, Qingsong Wu1, and Renchao Che1 ()


1 Department of Materials Science and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China
2 Department of Chemistry, Fudan University, Shanghai 200433, China
3 National Laboratory of Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
4 Department of Physics, Fudan University, Shanghai 200433, China
These authors contributed equally to this work.

DOI 10.1007/s12274-013-0305-y

Nano Research 2013, 6(4): 275每285

Address correspondence to rcche@fudan.edu.cn

The metastable wurtzite polymorph of the magnetic semiconductor MnSe has been synthesized via a colloidal approach and has tailored shapes and low-temperature surface spin-glass behavior.

    

Synthesis of a sulfur每graphene composite as an enhanced metal-free photocatalyst

Wenchao Peng and Xiaoyan Li ()


Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China

DOI 10.1007/s12274-013-0306-x

Nano Research 2013, 6(4): 286每292

Address correspondence to xlia@hkucc.hku.hk

A novel metal-free photocatalyst〞sulfur/graphene (S/GR) composite〞has been synthesized using a facile, one-pot hydrothermal method. The composite showed good activity for the photocatalytic degradation of methyl orange under both UV and solar light.

    

One-step scalable preparation of N-doped nanoporous carbon as a high-performance electrocatalyst for the oxygen reduction reaction

Zhenyu Liu, Guoxin Zhang, Zhiyi Lu, Xiuyan Jin, Zheng Chang, 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/s12274-013-0307-9

Nano Research 2013, 6(4): 293每301

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

Porous carbon materials with high specific surface area and high nitrogen content have been prepared by a one-step pyrolysis of ethylenediaminetetraacetic acid (EDTA) and melamine in the presence of KOH and Co(NO3)2•6H2O. The as-prepared catalysts demonstrated high activity, stability, and four-electron selectivity for the oxygen reduction reaction (ORR), comparable to a commercial Pt/C catalyst, but with superior durability and better tolerance to methanol crossover.

    

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