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  1. Localized Surface Plasmon Induced Position-Sensitive Photodetection in Silicon-Nanowire-Modified Ag/Si

    Chunlian Mei, Shuai Liu, Xu Huang, Zhikai Gan, Peiqi Zhou and Hui Wang

    Version of Record online: 22 SEP 2017 | DOI: 10.1002/smll.201701726

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    Sensitivity is one of the main technical specifications of position-sensitive detectors. However, weak light absorption and low photoelectric conversion are two limitations to obtain prominent sensitivity. Based on localized surface plasmon, a large enhanced lateral photovoltaic effect is detected in a silicon nanowire-modified metal–semiconductor structure. Thus, a high position-dependent sensitivity is achieved in millimeter range.

  2. Flexible Broadband Graphene Photodetectors Enhanced by Plasmonic Cu3−xP Colloidal Nanocrystals

    Tian Sun, Yongjie Wang, Wenzhi Yu, Yusheng Wang, Zhigao Dai, Zeke Liu, Bannur Nanjunda Shivananju, Yupeng Zhang, Kai Fu, Babar Shabbir, Wanli Ma, Shaojuan Li and Qiaoliang Bao

    Version of Record online: 22 SEP 2017 | DOI: 10.1002/smll.201701881

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    High-performance and broadband photodetectors based on the hybrid graphene-Cu3−xP nanocrystal structure are demonstrated. A flexible graphene-Cu3−xP photodetector on polyethylene naphthalate substrate capable of infrared (IR) light detection is realized and the photocurrent shows no obvious degradation even after 5000 times bending, indicating a very good flexibility. This work paves a new way for fabrication of broadband and flexible IR optoelectronic devices.

  3. Mediatorless, Reversible Optical Nanosensor Enabled through Enzymatic Pocket Doping

    Vitalijs Zubkovs, Nils Schuergers, Benjamin Lambert, Esra Ahunbay and Ardemis A. Boghossian

    Version of Record online: 22 SEP 2017 | DOI: 10.1002/smll.201701654

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    This study presents a reversible, mediatorless, near-infrared glucose sensor based on glucose oxidase-wrapped single-walled carbon nanotubes (SWCNTs). A combination of fluorescence, absorption, and Raman spectroscopy measurements suggests a fluorescence enhancement mechanism based on localized enzymatic doping of SWCNT defect sites that do not rely on added mediators. The cyclic addition and removal of glucose is shown to enhance and recover fluorescence, demonstrating reversibility.

  4. Conformal Coating of Co/N-Doped Carbon Layers into Mesoporous Silica for Highly Efficient Catalytic Dehydrogenation–Hydrogenation Tandem Reactions

    Zhujun Zhang, Xiangru Wei, Yan Yao, Zhi Chen, Aijian Zhang, Wei Li, Winston Duo Wu, Zhangxiong Wu, Xiao Dong Chen and Dongyuan Zhao

    Version of Record online: 22 SEP 2017 | DOI: 10.1002/smll.201702243

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    Co-nanocluster-intercalated N-doped carbon layers are conformally coated into mesoporous silicas. The features of ultrasmall Co nanoclusters, including strong N coordination, suitable pore size, and high water dispersibility, make them excellent for tandem catalytic hydrogenation of nitrobenzene and dehydrogenation of NaBH4 with well-matched reaction kinetics, 100% conversion and selectivity, high turnover frequencies, excellent stability, and magnetic recyclability.

  5. Tuning Excitonic Properties of Monolayer MoS2 with Microsphere Cavity by High-Throughput Chemical Vapor Deposition Method

    Yang Mi, Zhepeng Zhang, Liyun Zhao, Shuai Zhang, Jie Chen, Qingqing Ji, Jianping Shi, Xiebo Zhou, Rui Wang, Jia Shi, Wenna Du, Zhiyong Wu, Xiaohui Qiu, Qing Zhang, Yanfeng Zhang and Xinfeng Liu

    Version of Record online: 20 SEP 2017 | DOI: 10.1002/smll.201701694

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    Excitonic properties of molybdenum disulphide (MoS2) are tuned by directly depositing onto silica microspheres with chemical vapor deposition method. Whispering gallery mode peaks are observed and ultrafast spectroscopy studies suggest radiative recombination rate in MoS2 is enhanced due to Purcell effect. Refractive index sensing based on MoS2 cavity is demonstrated with sensitivity up to 150 nm per refractive index unit.

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