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Terahertz Graphene Optics

Nima Rouhi1, Santiago Capdevila2, Dheeraj Jain1, Katayoun Zand1, Yung Yu Wang1, Elliott Brown3, Lluis Jofre2, and Peter Burke1()


1 Integrated Nanosystems Research Facility, Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA
2 Universitat Polit豕cnica de Catalunya, Barcelona, Spain
3 Wright State University, Dayton, OH 45435, USA

DOI 10.1007/s12274-012-0251-0

Nano Res. 2012, 5(10): 667每678

Address correspondence to pburke@uci.edu

This paper provides a comprehensive study of both single and multilayer graphene sheet conductance behavior in the broadband frequency range from DC to 1 THz.

    

Hollow Manganese Phosphate Nanoparticles as Smart Multifunctional Probes for Cancer Cell Targeted Magnetic Resonance Imaging and Drug Delivery

Jing Yu1, Rui Hao1, Fugeng Sheng2 (), Lili Xu2, Gongjie Li2, and Yanglong Hou1 ()


1 Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
2 Department of Radiology, Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, China

DOI 10.1007/s12274-012-0252-z

Nano Res. 2012, 5(10): 679每694

Address correspondence to Yanglong Hou, hou@pku.edu.cn; Fugeng Sheng, shengfugeng@gmail.com

Hollow manganese phosphate nanoparticles (HMP NPs) conjugated with folic acid (FA) have been developed for pH-selective magnetic resonance imaging (MRI) and drug delivery. The cavity of HMP NPs can be loaded with the anti-cancer drug doxorubicin (DOX), and the resulting material can target cells overexpressing the folate receptor, release drugs in a pH-triggered manner, and give remarkable improvements in MRI.

    

A Graphene-Based Surface Plasmon Sensor

Wei Chun Tan1, Mario Hofmann2 (),  Ya-Ping Hsieh3 (), Meng Lin Lu1, and Yang Fang Chen1 ()


1 Taiwan University, Department of Physics, Taipei, 10617
2 Cheng-Kung University, Department of Materials Science, Tainan, 701
3 Chung-Cheng University, Graduate Institute of Opto-Mechatronics, Chia-Yi, 62102

DOI 10.1007/s12274-012-0253-y

Nano Res. 2012, 5(10): 695每702

Address correspondence to Yang Fang Chen, yfchen@phys.ntu.edu.tw; Mario Hofmann, mariohof@MIT.EDU; Ya-Ping Hsieh, yphsieh @ccu.edu.tw

The use of graphene electronic devices as a sensitive sensing platform for surface plasmons is demonstrated.

    

Ultra-Small Graphene Oxide Functionalized with Polyethylenimine (PEI) for Very Efficient Gene Delivery in Cell and Zebrafish Embryos

Xiang Zhou1,3,∫, Fabrice Laroche4,5,∫, Gerda E. M. Lamers4, Vincenzo Torraca4, Patrick Voskamp1, Tao Lu3, Fuqiang Chu2, Herman P. Spaink4,5 (), Jan Pieter Abrahams1 (), and Zunfeng Liu1,2,6 ()


1 Biophysical Structural Chemistry, Cell Observatory, Leiden Institute of Chemistry, Leiden, 2333 CC, the Netherlands
2 School of pharmaceutical engineering and life science, Changzhou University, Changzhou 213164, China
3 State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing 210009, China
4 The Institute of Biology Leiden, Gorlaeus Laboratoria, Leiden University, 2333 CC Leiden, the Netherlands
5 Department of Molecular Biology and Genetics, Aarhus University, Centre for Carbohydrate Recognition and Signalling (CARB), 8000 Aarhus C, Denmark
6 Biomedical Research Center, Jiangnan Graphene Research Institute, Changzhou 213100, China
These authors contributed equally to this work

DOI 10.1007/s12274-012-0254-x

Nano Res. 2012, 5(10): 703每709

Address correspondence to Zunfeng Liu, liuz2@chem.leidenuniv.nl; Jan Pieter Abrahams, abrahams@chem.leidenuniv.nl; Herman P. Spaink, h.p.spaink@biology.leidenuniv.nl

Ultra-small graphene oxide (USGOㄘhas been prepared by an epoxy ring opening reaction and functionalized with polyethyleneimine (PEI). Very efficient gene delivery into cells and zebrafish embryos was achieved using the PEI-grafted-USGO.

    

Characteristics and Effects of Diffused Water Between Graphene and a SiO2 Substrate

Mi Jung Lee1, Jin Sik Choi1, Jin-Soo Kim1, Ik-Su Byun1, Duk Hyun Lee1, Sunmin Ryu2, Changgu Lee3 (), and Bae Ho Park1 ()


1 Division of Quantum Phases & Devices, Department of Physics, Konkuk University, Seoul 143-701, Korea
2 Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea
3 Department of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Korea

DOI 10.1007/s12274-012-0255-9

Nano Res. 2012, 5(10): 710每717

Address correspondence to Bao Ho Park, baehpark@konkuk.ac.kr; Changgu Lee, peterlee@skku.edu

After a week long exposure to high humidity, the evolution of dendritic wrinkles could be observed in exfoliated graphene on a SiO2 substrate. Small, faint wrinkles coalesced into larger wrinkles. Particularly intense wrinkle evolution resulted in the formation of folded graphene. Moreover, the graphene height changed from 3.9 Å to ~12 Å after exposure to high humidity. It appeared that a double ice-like water layer (~8 Å) formed between graphene and the SiO2 substrate under high humidity conditions, thereby elevating the graphene layer. Although mechanically exfoliated monolayer graphene on mica showed the same height changes following high humidity exposure, we did not find any evidence of wrinkle formation in this case.

    

Engineering Manganese Oxide/Nanocarbon Hybrid Materials for Oxygen Reduction Electrocatalysis

Ju Feng1,∫, Yongye Liang1,∫, Hailiang Wang1, Yanguang Li1, Bo Zhang1, Jigang Zhou2, Jian Wang2, Tom Regier2, and Hongjie Dai1 ()


1 Department of Chemistry, Stanford University, Stanford, CA 94305, USA
2 Canadian Light Source Inc., Saskatoon, SK, Canada
These authors contributed equally to this work

DOI 10.1007/s12274-012-0256-8

Nano Res. 2012, 5(10): 718每725

Address correspondence to hdai@stanford.edu

Sustainable catalysts for the oxygen reduction reaction (ORR) have been developed by rational design of manganese oxide/nanocarbon hybrids. Manganese oxide nanoparticles were grown on graphene to afford strong carbon每oxide interactions. The addition of mildly oxidized multi-walled nanotubes enhanced the conductivity and catalytic activity of the hybrid. An air calcination step was also found important in order to achieve high ORR activity of the resulting hybrid.

    

A Composite Material of Uniformly Dispersed Sulfur on Reduced Graphene Oxide: Aqueous One-Pot Synthesis, Characterization and Excellent Performance as the Cathode in Rechargeable Lithium每Sulfur Batteries

Hui Sun1, Gui-Liang Xu2, Yue-Feng Xu2, Shi-Gang Sun2 (), Xinfeng Zhang1, Yongcai Qiu1, and Shihe Yang1 ()

 

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

DOI 10.1007/s12274-012-0257-7

Nano Res. 2012, 5(10): 726每738

Address correspondence to Shihe Yang, chsyang@ust.hk; Shi-Gang Sun, sgsun@xmu.edu.cn

A sulfur每graphene composite with uniformly dispersed sulfur on the graphene sheets has been prepared by an aqueous one-pot synthesis involving the simultaneous oxidation of sulfide and reduction of graphene oxide. When used as the cathode of a rechargeable lithium每sulfur battery, the as-prepared composite materials with a sulfur content of 63.6% delivered a reversible capacity of 804 mA•h/g at 0.186 C after 80 cycles, and 440 mA•h/g at 0.75 C after 500 cycles of charge/discharge.

    

Anomalous Anisotropic Magnetoresistance in Topological Insulator Films

Jian Wang1,2 (), Handong Li3,4, Cuizu Chang5,6, Ke He5, Joon Sue Lee2, Haizhou Lu3, Yi Sun1, Xucun Ma5, Nitin Samarth2, Shunqing Shen3, Qikun Xue5,6, Maohai Xie3, and Moses H. W. Chan2 ()


1 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
2 The Center for Nanoscale Science and Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA
3 Physics Department, The University of Hong Kong, Pokfulam Road, Hong Kong, China
4 State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
5 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
6 Department of Physics, Tsinghua University, Beijing 100084, China

DOI 10.1007/s12274-012-0260-z

Nano Res. 2012, 5(10): 739每746

Address correspondence to Jian Wang, jianwangphysics@pku.edu.cn; Moses H. W. Chan, chan@phys.psu.edu

The high quality Bi2Se3 topological insulator thin films have been fabricated by molecular beam epitaxy (a) and analyzed by angle-resolved photoemission spectroscopy (b). Transport measurements under an in-plane magnetic field, perpendicular to (c) and along (d) the bias current show anomalous opposite magnetoresistance.

    

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