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Hollow spherical rare-earth-doped yttrium oxysulfate: A novel structure for upconversion

Gen Chen1,2, Fashen Chen1, Xiaohe Liu1 (*), Wei Ma1, Hongmei Luo2, Junhui Li3 (*), Renzhi Ma4, Guanzhou Qiu1


1 Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China
2 Department of Chemical Engineering, New Mexico State University, Las Cruces, New Mexico 88003, USA
3 State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electronical Engineering, Central South University, Changsha, Hunan 410083, China
4 International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan

DOI 10.1007/s12274-014-0472-5

Nano Research 2014, 7(8): 1093每1102

Address correspondence to Xiaohe Liu, liuxh@csu.edu.cn; Junhui Li, lijunhui@csu.edu.cn

The monoclinic crystal polymorph of Y2O2SO4 has been demonstrated to have excellent structural compatibility with dopant rare-earth ions making it a promising material for upconversion (UC) applications. The UC emission intensity of calcined products was 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 Key Lab of Separation Sciences for Analytical Chemistry, National Chromatographic R&A Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Institute of Cancer Stem Cell, Dalian Medical University, Dalian 116044, China

DOI 10.1007/s12274-014-0473-4

Nano Research 2014, 7(8): 1103每1115

Address correspondence to Ren*an Wu, wurenan@dicp.ac.cn; Hanfa Zou, hanfazou@dicp.ac.cn

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 mitochondriatargeted 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 (*)

Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education,and School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China

DOI 10.1007/s12274-014-0474-3

Nano Research 2014, 7(8): 1116每1127

Address correspondence to xulq@sdu.edu.cn

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 NiFe2O4 show high reversible discharge capacity and good rate retention performance which make them promising materials for use as the anodes in lithium ion batteries.

    

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 (*)

Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Republic of Korea

DOI 10.1007/s12274-014-0475-2

Nano Research 2014, 7(8): 1128每1136

Address correspondence to shhong@snu.ac.kr

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 high- performance 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 Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740, USA
2 School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, South Korea
3 Department of Mechanical Engineering, Gachon University, Seongnam-si, Gyeonggi 461-701, South Korea
4 Department of Electronics and Radio Engineering, Kyung Hee University, Gyeonggi 446-701, South Korea
5 Flexible Display Research Center, Korea Electronics Technology Institute, Seongnam, Gyeonggi 463-816, South Korea These authors contributed equally to this publication.

DOI 10.1007/s12274-014-0476-1

Nano Research 2014, 7(8): 1137每1145

Address correspondence to Costas P. Grigoropoulos, cgrigoro@berkeley.edu; Sunkook Kim, seonkuk@khu.ac.kr

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 in transistor performance, including higher peak field-effect mobility, increased output resistance, increased self-gain, and decreased subthreshold swing.

    

Enhanced Fabry每Perot resonance in GaAs nanowires through local field enhancement and surface passivation

Shermin Arab1,†, P. Duke Anderson1,†, Maoqing Yao1,†, Chongwu Zhou1,3,†, P. Daniel Dapkus1,2,3,†, Michelle L. Povinelli1,†, and Stephen B. Cronin1,2,† (*)

1 Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA
2 Department of Physics, University of Southern California, Los Angeles, CA 90089, USA
3 Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA
Center for Energy Nanoscience, University of Southern California, Los Angeles, CA 90089, USA

DOI 10.1007/s12274-014-0477-0

Nano Research 2014, 7(8): 1146每1153

Address correspondence to scronin@usc.edu

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

    

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 Center for Advanced Photovoltaics, Department of Electrical Engineering, South Dakota State University, Brookings, SD, 57007, USA
2 School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
These authors contributed equally to this work.

DOI 10.1007/s12274-014-0478-z

Nano Research 2014, 7(8): 1154每1163

Address correspondence to Xuefeng Qian, xfqian@sjtu.edu.cn; Qiquan Qiao, Qiquan.Qiao@sdstate.edu

TiO2 coated urchin-like SnO2 can suppress interfacial recombination of electrons, enhance dye loading capability and light scattering ability. Dye-sensitized solar cells (DSSCs) based on obtained materials show similar efficiency compared with pure TiO2 nanocrystalline 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 Department of Chemistry and Center for Nanoscience and Nanotechnology, ※National Sun Yat-sen University§, Kaohsiung 80424
2 School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 80707

DOI 10.1007/s12274-014-0479-y

Nano Research 2014, 7(8): 1164每1176

Address correspondence to shsieh@facmail.nsysu.edu.tw

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 Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, P. O. Box 1129, Hefei 230031, China
2 University of Science and Technology of China, Hefei 230026, China 3 Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

DOI 10.1007/s12274-014-0480-5

Nano Research 2014, 7(8): 1177每1187

Address correspondence to gwmeng@issp.ac.cn

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.

    

Straight and kinked InAs nanowire growth observed in situ by transmission electron microscopy

Filip Lenrick1 (*), Martin Ek1,†, Knut Deppert2, Lars Samuelson2, and L. Reine Wallenberg1 (*)

1 nCHREM/Centre for Analysis and Synthesis, Lund University, Lund 22100, Sweden
2 Division of Solid State Physics, Lund University, Lund 22100, Sweden
Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark

DOI 10.1007/s12274-014-0481-4

Nano Research 2014, 7(8): 1188每1194

Address correspondence to Filip Lenrick, filip.lenrick@polymat.lth.se; L. Reine Wallenberg, reine.wallenberg@chem.lu.se

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 (*)

 

State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China

DOI 10.1007/s12274-014-0482-3

Nano Research 2014, 7(8): 1195每1204

Address correspondence to guning@seu.edu.cn

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每 shell nanothorns for the oxygen reduction reaction

Gengtao Fu2, Zhenyuan Liu2, Yu Chen1 (*), Jun Lin2, Yawen Tang2 (*), and Tianhong Lu2

1 School of Materials Science and Engineering, Shaanxi Normal University, Xi*an 710062, China
2 Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China

DOI 10.1007/s12274-014-0483-2

Nano Research 2014, 7(8): 1205每1214

Address correspondence to Yu Chen, ndchenyu@gmail.com; Yawen Tang, tangyawen@njnu.edu.cn

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

    

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, Beijing, 100083, China
2 School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
Authors with equal contribution, and authorship order determined by coin toss.

DOI 10.1007/s12274-014-0484-1

Nano Research 2014, 7(8): 1215每1223

Address correspondence to zlwang@gatech.edu

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 produce different 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, Upton, NY, 11973, USA
2 Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken NJ, 07030, USA

DOI 10.1007/s12274-014-0485-0

Nano Research 2014, 7(8): 1224每1231

Address correspondence to yong.shi@stevens.edu

A novel method that can measure thermal conductivity of individual thermoelectric oxide nanofibers prepared by electrospinning has been developed. La0.95Sr0.05CoO3 nanofibers with diameters of 140 nm and 290 nm were studied using this approach at ambient temperature.

    

High thermal conductivity of suspended few-layer hexagonal boron nitride sheets

Haiqing Zhou1,2, Jixin Zhu3,4, Zheng Liu4, Zheng Yan1, Xiujun Fan1,5, Jian Lin3,6, Gunuk Wang1, Qingyu Yan4 (*), Ting Yu2 (*), Pulickel M. Ajayan3,6 (*), and James M. Tour1,3,6 (*)

1 Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, USA
2 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
3 Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, Texas 77005, USA
4 School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore
5 College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, 100124, China
6 The Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, Texas 77005, USA

DOI 10.1007/s12274-014-0486-z

Nano Research 2014, 7(8): 1232每1240

Address correspondence to James M. Tour, tour@rice.edu; Pulickel M. Ajayan, ajayan@rice.edu; Ting Yu, yuting@ntu.edu.sg;Qingyu Yan, alexyan@ntu.edu.sg

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 每(3.41 ㊣ 0.12) ℅ 10每2, 每(3.15 ㊣ 0.14) ℅ 10每2 and 每(3.78 ㊣ 0.16) ℅ 10每2 cm每1﹞K每1, respectively. The room-temperature thermal conductivity of few- layer h-BN sheets was found to be around 243 W﹞m每1﹞K每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.

    

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