Contents

Research Articles

Hollow spherical rare-earth-doped yttrium oxysulfate: A novel structure for upconversion Gen Chen1,2, Fashen Chen1, Xiaohe Liu1,*, Wei Ma1, Hongmei Luo2, Junhui Li1,*, Renzhi Ma3,Guanzhou Qiu1 1 Central South University, China 2 New Mexico State University, USA 3 National Institute for Materials Science, Japan 1093–1102

The monoclinic crystal polymorph of Y2O2SO4 has been demonstrated to have excellent structural compatibility with dopantrare-earth ions making it a promising material for upconversion (UC) applications. The UC emission intensity of calcined productswas significantly enhanced when compared with the amorphous precursor, and the luminescent properties were also affected by the ratio and concentration of dopant rare-earth ions due to energy transfer and the symmetry of the crystal field.

Elevating mitochondrial reactive oxygen species by mitochondria-targeted inhibition of superoxide dismutase with a mesoporous silica nanocarrier for cancer therapy Yi Zhang1,2, Zhengyan Hu1,2, Guiju Xu1,2, Chuanzhou Gao3, Ren’an Wu1,*, and Hanfa Zou1,* 1 Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China

2 University of Chinese Academy of Sciences, China 3 Dalian Medical University, China 1103–1115

Since mitochondrial superoxide dismutase (SOD2) is vital in maintaining intracellular levels of reactive oxygen species (ROS), a general strategy for killing cancer cells is reported by targeted inhibition of SOD2 using 2-methoxyestradiol (2-ME, an inhibitor for the SOD family) via an elaborately designed mitochondria-targeted mesoporous silica nanocarrier (mtMSN). The elevation of mitochondrial oxidative stress is demonstrated to be powerful in cancer therapy.

Hierarchical porous metal ferrite ball-in-ball hollow spheres: General synthesis, formation mechanism, and high performance as anode materials for Li-ion batteries Shouli Li, Aihua Li, Ranran Zhang, Yanyan He,Yanjun Zhai, and Liqiang Xu* Shandong University, China 1116–1127

A general and facile high yield method for the synthesis of CoFe2O4,NiFe2O4 and CdFe2O4 hierarchical porous ball-in-ball hollow spheres has been developed. The as-obtained CoFe2O4 and NiFe2O4show high reversible discharge capacity and good rate retention performance which make them promising materials for use as the anodes in lithium ion batteries.

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Nano Research Vol. 7, No. 8, August 2014

SnO2@Co3O4 hollow nano-spheres for a Li-ion battery anode with extraordinary performance Won-Sik Kim, Yoon Hwa, Hong-Chan Kim, Jong-Hyun Choi, Hun-Joon Sohn, and Seong-Hyeon Hong* Seoul National University, Republic of Korea 1128–1136

We report a facile route for the synthesis of SnO2@Co3O4 hollow spheres and their extraordinary performance as an anode for lithium-ion batteries.

Selective and localized laser annealing effect for highper- formance flexible multilayer MoS2 thin-film transistors Hyukjun Kwon1, Woong Choi2, Daeho Lee1,3, Yunsung Lee4, Junyeon Kwon4, Byungwook Yoo5, Costas P. Grigoropoulos1,*, and Sunkook Kim4,* 1 University of California, Berkeley, USA 2 Kookmin University, South Korea 3 Gachon University, South Korea 4 Kyung Hee University, South Korea 5 Korea Electronics Technology Institute, South Korea 1137–1145

Flexible multilayer MoS2 field effect transistors (FETs) enhanced by an ultra-short pulsed laser annealing process without any inflicted thermal damage are demonstrated. The reduced contact resistance after laser annealing provides significant improvements intransistor performance, including higher peak field-effect mobility,increased output resistance, increased self-gain, and decreased subthreshold swing.

Enhanced Fabry–Perot resonance in GaAs nanowires through local field enhancement and surface passivation Shermin Arab, P. Duke Anderson, Maoqing Yao, Chongwu Zhou, P. Daniel Dapkus,Michelle L. Povinelli, and Stephen B. Cronin* University of Southern California, USA 1146–1153

We observed substantial improvements in the photoluminescence (PL) efficiency and Fabry-Perot (FP) resonance of individual GaAsnanowires through surface passivation and local field enhancement.

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Nano Research Vol. 7, No. 8, August 2014

TiO2 coated urchin-like SnO2 microspheres for efficient dye-sensitized solar cells Amit Thapa1, Jiantao Zai2, Hytham Elbohy1, Prashant Poudel1, Nirmal Adhikari1, Xuefeng Qian2,*, and Qiquan Qiao1,* 1 South Dakota State University, USA 2 Shanghai Jiao Tong University, China 1154–1163

TiO2 coated urchin-like SnO2 can suppress interfacial recombinationof electrons, enhance dye loading capability and light scattering ability. Dye-sensitized solar cells (DSSCs) based on obtained materials show similar efficiency compared with pure TiO2nanocrystalline photoanodes while only use ~55% amount of dye.

Aqueous self-assembly and surface-functionalized nanodots for live cell imaging and labeling Mei-Lang Kung1, Pei-Ying Lin1, Chiung-Wen Hsieh1, and Shuchen Hsieh1,2,* 1 “National Sun Yat-sen University”, Taiwan, China 2 Kaohsiung Medical University, Taiwan, China 1164–1176

Schematic illustration of a conjugated self-assembled nanodot (SAND) system for targeted cell imaging.

Polyacrylic acid sodium salt film entrapped Ag-nanocubes as molecule traps for SERS detection Zhulin Huang1, Guowen Meng1,2,*, Qing Huang3, Bin Chen1, Fei Zhou1, Xiaoye Hu1, Yiwu Qian1, Haibin Tang1, Fangming Han1, and Zhaoqin Chu1 1 Institute of Solid State Physics, Chinese Academy of Sciences, China

2 University of Science and Technology of China, China 3 Hefei Institutes of Physical Science, Chinese Academy of Sciences, China

1177–1187

By using networked polyacrylic acid sodium salt (PAAS) to trap target molecules, an Ag-nanocubes@PAAS substrate is able to capture molecules with weak binding affinity facilitating their effective surface-enhanced Raman spectroscopy detection.

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Nano Research Vol. 7, No. 8, August 2014

Straight and kinked InAs nanowire growth observed in situ by transmission electron microscopy Filip Lenrick*, Martin Ek†, Knut Deppert, Lars Samuelson, and L. Reine Wallenberg* Lund University, Lund 22100, Sweden † Present address: Haldor Topsøe A/S, Denmark 1188–1194

In situ growth observations of crystalline InAs nanowires have been performed by transmission electron microscopy. Straight growth and induced kinking behavior were studied using a closed cell.

Surface properties of encapsulating hydrophobic nano- particles regulate the main phase transition temperature of lipid bilayers: A simulation study Xubo Lin and Ning Gu* Southeast University, China 1195–1204

The main phase transition temperature of lipid bilayers can be regulated by changing the surface roughness and surface molecule density of encapsulating hydrophobic nanoparticles, which may promote potential biomedical applications such as controllable drug release.

Synthesis and electrocatalytic activity of Au@Pd core– shell nanothorns for the oxygen reduction reaction Gengtao Fu2, Zhenyuan Liu2, Yu Chen1,*, Jun Lin2, Yawen Tang2,*, and Tianhong Lu2 1 Shaanxi Normal University, China 2 Nanjing Normal University, China 1205–1214

Au@Pd core–shell nanothorns with porous surfaces exhibit remarkably high electrocatalytic activity and durability for the oxygen reduction reaction in the alkaline media.

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Nano Research Vol. 7, No. 8, August 2014

Transparent paper-based triboelectric nanogenerator as a page mark and anti-theft sensor Limin Zhang1, Fei Xue1, Weiming Du1, Changbao Han1, Chi Zhang1, and Zhonglin Wang1,2,* 1 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, China

2 Georgia Institute of Technology, USA 1215–1223

We have integrated grating-structured paper-based triboelectric nanogenerators (PTENGs) into a book as a self-powered anti-theft sensor, which can effectively convert mechanical agitation during handling the book pages into an electrical output to either drive a commercial electronic device or trigger a warning buzzer. Furthermore, different grating-structures on each page producedifferent number of output peaks which can accurately position the turned pages and record the pages flipped over.

Characterization of the thermal conductivity of La0.95Sr0.05CoO3 thermoelectric oxide nanofibers Weihe Xu1,2, Evgeny Nazaretski1, Ming Lu1, Hamid Hadim2, and Yong Shi2,* 1 Brookhaven National Lab, USA 2 Stevens Institute of Technology, USA 1224–1231

A novel method that can measure thermal conductivity of individual thermoelectric oxide nanofibers prepared by electrospinning has beendeveloped. La0.95Sr0.05CoO3 nanofibers with diameters of 140 nm and290 nm were studied using this approach at ambient temperature.

High thermal conductivity of suspended few-layer hexagonal boron nitride sheets Haiqing Zhou1,2, Jixin Zhu1,2, Zheng Liu2, Zheng Yan1, Xiujun Fan1,3, Jian Lin1, Gunuk Wang1, Qingyu Yan2,*, Ting Yu2,*, Pulickel M. Ajayan1,*, and James M. Tour1,* 1 Rice University, USA 2 Nanyang Technological University, Singapore 3 Beijing University of Technology, China 1232–1240

We report the experimental investigation of thermal conduction in suspended few-layer hexagonal boron nitride (h-BN) sheets using a noncontact micro-Raman spectroscopy method. The first-order temperature coefficients for monolayer (1L), bilayer (2L) and nine-layer (9L) h-BN sheets were found to be –(3.41 ± 0.12) × 10–2, –(3.15 ± 0.14) × 10 and –(3.78 ± 0.16) × 10–2 cm–1·K–1, respectively.The room-temperature thermal conductivity of few- layer h-BN sheets was found to be around 243 W·m–1·K–1, which is comparable to that of bulk h-BN, indicating their potential use as important components to solve heat dissipation problems in thermal manage-ment configurations.

Erratum to: Growth of silicon nanowires in aqueous solution under atmospheric pressure (DOI 10.1007/s12274-014-0451-x) 1241

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