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  1. Large-Scale Synthesis of Freestanding Layer-Structured PbI2 and MAPbI3 Nanosheets for High-Performance Photodetection

    Changyong Lan, Ruoting Dong, Ziyao Zhou, Lei Shu, Dapan Li, SenPo Yip and Johnny C. Ho

    Version of Record online: 17 AUG 2017 | DOI: 10.1002/adma.201702759

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    High-density, crystalline, and freestanding PbI2 and MAPbI3 nanosheets are synthesized on a large-scale through the nucleation of microplanes on rough-surfaced substrates by manipulating the microenvironment during physical vapor deposition. When configured into photodetectors, they exhibit efficient photodetection with excellent performance in responsivity, detectivity, etc.

  2. Molybdenum Oxides – From Fundamentals to Functionality

    Isabela Alves de Castro, Robi Shankar Datta, Jian Zhen Ou, Andres Castellanos-Gomez, Sharath Sriram, Torben Daeneke and Kourosh Kalantar-zadeh

    Version of Record online: 16 AUG 2017 | DOI: 10.1002/adma.201701619

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    Molybdenum is found in various oxide stoichiometries, which have been employed for different high-value research and commercial applications. The variations in oxidation states allow the manipulation of crystal structure, morphology, oxygen vacancies, and dopants, to control and engineer the electronic states, which makes them versatile and highly tunable for incorporation in optical, electronic, catalytic, bio, and energy systems.

  3. Electrical Textile Valves for Paper Microfluidics

    Alar Ainla, Mahiar M. Hamedi, Firat Güder and George M. Whitesides

    Version of Record online: 15 AUG 2017 | DOI: 10.1002/adma.201702894

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    Textile valves based on an electrowetting principle and their use in paper microfluidics are presented. These valves can be integrated into paper-based microfluidics monolithically, require no mechanically moving parts, are fast, require low energy, and work with a variety of aqueous solutions. Furthermore, such valves can be combined into self-regulating autonomous circuits and used for reagent addition in assays.

  4. Hedgehog-Like Upconversion Crystals: Controlled Growth and Molecular Sensing at Single-Particle Level

    Xiaowang Liu, Xiyan Li, Xian Qin, Xiaoji Xie, Ling Huang and Xiaogang Liu

    Version of Record online: 14 AUG 2017 | DOI: 10.1002/adma.201702315

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    Hedgehog-like crystals comprising lanthanide dopants are synthesized through a combination of kinetic and thermodynamic control via a seed-mediated approach. The hierarchical morphology of the as-prepared crystals enables easy surface modification with a layer of MnO2 nanosheets, further allowing the development of a single-particle-based platform for ultrasensitive molecular detection.

  5. Amorphous Bimetallic Oxide–Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn–Air Batteries

    Li Wei, H. Enis Karahan, Shengli Zhai, Hongwei Liu, Xuncai Chen, Zheng Zhou, Yaojie Lei, Zongwen Liu and Yuan Chen

    Version of Record online: 14 AUG 2017 | DOI: 10.1002/adma.201701410

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    Simultaneous control of bimetallic oxide nanoparticle elemental composition, size, and crystallinity yields a high-performance bifunctional oxygen evolution and reduction electrocatalyst for rechargeable Zn–air batteries. This method has general applicability toward various binary, tertiary, or even quadruple metal systems.

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