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  1. Imaging Heterogeneously Distributed Photo-Active Traps in Perovskite Single Crystals

    Haifeng Yuan, Elke Debroye, Eva Bladt, Gang Lu, Masoumeh Keshavarz, Kris P. F. Janssen, Maarten B. J. Roeffaers, Sara Bals, Edward H. Sargent and Johan Hofkens

    Version of Record online: 19 FEB 2018 | DOI: 10.1002/adma.201705494

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    Optical differential super-resolution localization microscopy maps the heterogeneous distribution of photo-active traps in organic–inorganic lead halide perovskite nanocrystals by contrast of photoluminescence intermittency. The reconstructed trap distribution is correlated with the morphology and crystallinity of nanocrystals. The higher average trap density revealed in polycrystalline nanocrystals indicates that the traps are correlated with structural defects.

  2. Single Carbon Fibers with a Macroscopic-Thickness, 3D Highly Porous Carbon Nanotube Coating

    Mingchu Zou, Wenqi Zhao, Huaisheng Wu, Hui Zhang, Wenjing Xu, Liusi Yang, Shiting Wu, Yunsong Wang, Yijun Chen, Lu Xu and Anyuan Cao

    Version of Record online: 19 FEB 2018 | DOI: 10.1002/adma.201704419

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    Macroscopic CNTs@CF hybrid fibers are fabricated by directly growing a millimeter-thick 3D porous carbon nanotube sponge layer on a single carbon fiber with high interfacial strength quantified by pull-out tests, and show potential applications in reinforced nanocomposites and high-performance fiber-shaped energy devices such as supercapacitors and lithium-ion batteries.

  3. Direct Visualization of the Reversible O2−/O Redox Process in Li-Rich Cathode Materials

    Xiang Li, Yu Qiao, Shaohua Guo, Zhenming Xu, Hong Zhu, Xiaoyu Zhang, Yang Yuan, Ping He, Masayoshi Ishida and Haoshen Zhou

    Version of Record online: 19 FEB 2018 | DOI: 10.1002/adma.201705197

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    A typical Li-rich material Li1.2Ni0.2Mn0.6O2 is systematically analyzed by in situ X-ray diffraction and Raman spectroscopy. Peroxo O[BOND]O bonding is directly visualized mostly along the c-axis and a reversible O2−/O redox process is demonstrated. Additionally, the formation of peroxo O[BOND]O bonds is calculated via density functional theory, and the corresponding O[BOND]O bond length of ≈1.3 Å matches well with the in situ Raman results.

  4. A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

    Palani R. Jothi, Kunio Yubuta and Boniface P. T. Fokwa

    Version of Record online: 19 FEB 2018 | DOI: 10.1002/adma.201704181

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    A simple, general synthetic route toward transition metal nanoborides is presented. This new method takes advantage of the redox chemistry of Sn/SnCl2 and the volatility and recrystallization of SnCl2 to produce crystalline phases of 3d, 4d, and 5d transition metal nanoborides with different morphologies (nanorods, nanosheets, nanoprisms, nanoplates, nanoparticles) for the first time.

  5. Light-Induced Reversible Control of Ferroelectric Polarization in BiFeO3

    Ming-Min Yang and Marin Alexe

    Version of Record online: 19 FEB 2018 | DOI: 10.1002/adma.201704908

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    Full optical control of ferroelectric order parameters at room temperature is demonstrated by a combination of the bulk photovoltaic effect and the tip of an atomic force microscope. The ferroelectric polarization of a BiFeO3 thin film can be reversibly switched solely by light via changing illumination areas or simply rotating the light polarization angles.