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Charge Separation and Ultraviolet Photovoltaic Conversion of ZnO Quantum Dots Conjugated with Graphene Nanoshells

Dong Ick Son1, Byoung Wook Kwon1, Jeong Do Yang1, Dong Hee Park1, Won Seon Seo2, Hyunbok Lee3, Yeonjin Yi3, Chang Lyoul Lee4, and Won Kook Choi1 ()


1 Interface Control Research Center, Future Convergence Research Division, Korea Institute of Science and Technology, Hwarangno 14 gil 5, Seoul, 136-791 Korea
2 Green Ceramics Division, Korea Institute of Ceramic Engineering and Technology, 7710-gil, Digital-ro, Geumcheon-gu, Seoul, 153-801 Korea
3 Department of Physics, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 120-749 Korea
4 Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong Buk-gu, Gwangju, 500-712 Korea

DOI 10.1007/s12274-012-0258-6

Nano Res. 2012, 5(11): 747每761

Address correspondence to wkchoi@kist.re.kr

ZnO每graphene quasi core每shell quantum dot (QD) structures, in which the inner ZnO QDs are covered with graphene nanoshells, have been synthesized via a simple solution method. Time-correlated single photon counting measurements gave average lifetime of 0.13 ns and 0.165 ns for the 375 and 383 nm ultraviolet (UV) emissions, respectively. These values were approximately 10 times faster than those of 1.86 ns and 1.83 ns of the reference ZnO QDs. Based on these superior UV properties, a multilayer structure hybrid UV photovoltaic cell was fabricated using ZnO每graphene core每shell QDs as an active layer and its performance was tested.

    

Visible Light Active Pure Rutile TiO2 Photoanodes with 100% Exposed Pyramid-Shaped (111) Surfaces

Xiaolu Liu1, Haimin Zhang1, Xiangdong Yao2, Taicheng An3, Porun Liu1, Yun Wang1, Feng Peng4, Anthony R. Carroll1, and Huijun Zhao1 ()


1 Centre for Clean Environment and Energy, and Griffith School of Environment, Griffith University, Gold Coast Campus, QLD 4222, Australia
2 QLD Micro- and Nanotechnology Centre, Griffith University, Nathan Campus, QLD 4111, Australia
3 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

DOI 10.1007/s12274-012-0259-5

Nano Res. 2012, 5(11): 762每769

Address correspondence to h.zhao@griffith.edu.au

A pure rutile TiO2 photoanode with 100% exposed pyramid-shaped (111) surfaces has been directly synthesized onto a conducting substrate via a facile hydrothermal process and showed excellent visible light photoelectrocatalytic activity toward oxidation of water and organics, owing to the presence of bulk-doped Ti3+ and the high reactivity of {111} facets.

    

Upconversion Nanoparticles Dramatically Promote Plant Growth Without Toxicity

Juanjuan Peng1, Yun Sun1, Qian Liu1, Yang Yang1, Jing Zhou1, Wei Feng1 (), Xianzhong Zhang2, and Fuyou Li1 ()


1 State Key Laboratory of Molecular Engineering of Polymers, & Institutes of Biomedical Sciences, Fudan University, 220 Handan Road, Shanghai 200433, China
2 Key Laboratory of Radiopharmaceuticals, Ministry of Education, & College of Chemistry, Beijing Normal University, 19 Xinjiekou Outer Street, Beijing 100875, China

DOI 10.1007/s12274-012-0261-y

Nano Res. 2012, 5(11): 770每782

Address correspondence to Fuyou Li, fyli@fudan.edu.cn; Wei Feng, fengweifd@fudan.edu.cn

The effects of upconversion nanoparticles (UCNPs) on the growth of plants have been investigated, and it was found that low concentrations promote the development of mung beans. UCNPs are excreted with feces without any detectable toxic effects on exposed mice.

    

Assembly of Suspended Graphene on Carbon Nanotube Scaffolds with Improved Functionalities

Sharon Xiaodai Lim1,2, Gavin Kok Wai Koon2,3, Da Zhan5, Zexiang Shen5, Barbaros Özyilmaz1,2,3,4, Chornghaur Sow1,2 ()


1 NUS Graduate School for Integrative Sciences and Engineering (NGS), Centre for Life Sciences (CeLS), #05-01, 28 Medical Drive, Singapore 117456
2 Department of Physics, Blk S12, Faculty of Science, National University of Singapore, 2 Science Drive 3, Singapore 117542
3 NanoCore, 4 Engineering Drive 3, National University of Singapore, Singapore 117576
4 Graphene Research Centre, National University of Singapore, Singapore 117542
5 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371

DOI 10.1007/s12274-012-0262-x

Nano Res. 2012, 5(11): 783每795

Address correspondence to physowch@nus.edu.sg

We present a simple method utilising a self-assembly process to bridge monolayer graphene across densified carbon nanotube (CNT) pillars/platforms/walls. The unique structure offers an alternative way to study the strain induced on the graphene sheet depending on the construct of the supporting structures. With the introduction of quantum dots into the system, a significant photocurrent effect hinted at the possibility of using this hybrid material for applications in future opto-electronic devices.

    

Shell-Doping of GaAs Nanowires with Si for n-Type Conductivity

Emmanouil Dimakis (), Manfred Ramsteiner, Abbes Tahraoui, Henning Riechert, and Lutz Geelhaar


Paul-Drude-Institut f邦r Festkörperelektronik, Hausvogteiplatz 5每7, 10117 Berlin, Germany

DOI 10.1007/s12274-012-0263-9

Nano Res. 2012, 5(11): 796每804

Address correspondence to dimakis@pdi-berlin.de

So far, the use of Si as n-type dopant for GaAs nanowires has been hampered by its amphoteric behavior that leads to heavy charge- carrier compensation. We demonstrate how the doping amphotericity of Si is related to the growth mode and the growth kinetics, and how it can be controlled in favor of donor-like behavior by employing a shell-doping scheme under certain growth conditions.

    

Solution-Processed Flexible Transparent Conductors Composed of Silver Nanowire Networks Embedded in Indium Tin Oxide Nanoparticle Matrices

Choong-Heui Chung, Tze-Bin Song, Brion Bob, Rui Zhu, and Yang Yang ()


Department of Materials Science and Engineering and California NanoSystems Institute, University of California Los Angeles, Los Angeles, CA 90095, USA

DOI 10.1007/s12274-012-0264-8

Nano Res. 2012, 5(11): 805每814

Address correspondence to yangy@ucla.edu

Surrounding silver nanowires by conductive indium tin oxide nanoparticles offers low wire to wire junction resistance, smooth surface morphology and excellent mechanical adhesion and flexibility while maintaining the high transmittance and the low sheet resistance.

    

Intracellular Dissociation of a Polymer Coating from Nanoparticles

Hongwei Chen (), Peng Zou, Jamie Connarn, Hayley Paholak, and Duxin Sun ()

Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48109, USA

DOI 10.1007/s12274-012-0265-7

Nano Res. 2012, 5(11): 815每825

Address correspondence to H. Chen, hongweic@umich.edu; D. Sun, duxins@umich.edu

Using quantum dots (QDs) labeled with a different color organic dye, we directly visualize the intracellular fate of the polymer coating from the inorganic nanoparticles via fluorescence microscopy. Our work suggests that the polymer coating of inorganic nanoparticles is disrupted after internalization by cancer cells.

    

Hierarchical WO3 Flowers Comprising Porous Single-Crystalline Nanoplates Show Enhanced Lithium Storage and Photocatalysis

Yongcai Qiu1,2, Gui-Liang Xu3, Qin Kuang2, Shi-Gang Sun3, and Shihe Yang1,2 ()


1 Nano Science and Technology Program, William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
2 Department of Chemistry , The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
3 State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

DOI 10.1007/s12274-012-0266-6

Nano Res. 2012, 5(11): 826每832

Address correspondence to chsyang@ust.hk

Morphology-conserved transformation affords hierarchical WO3 flowers made of porous single-crystalline nanoplates, which exhibit enhanced lithium storage and photocatalysis.

    

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