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  1. Superior Piezoelectric Properties in Potassium–Sodium Niobate Lead-Free Ceramics

    Kai Xu, Jun Li, Xiang Lv, Jiagang Wu, Xixiang Zhang, Dingquan Xiao and Jianguo Zhu

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adma.201601859

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    A superior piezoelectric coefficient (d33 = 570 ± 10 pC/N), the highest value reported to date in potassium-sodium niobate-based ceramics, is obtained in (1-x-y)K1-wNawNb1-zSbzO3-yBaZrO3-xBi0.5K0.5HfO3 ceramics. This high d33 value can be ascribed to the co-existence of “nano-scale strain domains” (1–2 nm) and a high density of ferroelectric domain boundaries. Therefore, ternary KNN-based ceramics demonstrate the potential for applications.

  2. Large-Size 2D β-Cu2S Nanosheets with Giant Phase Transition Temperature Lowering (120 K) Synthesized by a Novel Method of Super-Cooling Chemical-Vapor-Deposition

    Bo Li, Le Huang, Guangyao Zhao, Zhongming Wei, Huanli Dong, Wenping Hu, Lin-Wang Wang and Jingbo Li

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adma.201602701

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    2D triangular β-Cu2S nanosheets with large size and high quality are synthesized by a novel method of super-cooling chemical-vapor-deposition. The phase transition of this 2D material from β-Cu2S to γ-Cu2S occurs at 258 K (−15 °C), such transition temperature is 120 K lower than that of its bulk counterpart (about 378 K).

  3. Masthead: (Adv. Mater. 28/2016)

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adma.201670194

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    Artificial Synapses: Organometal Halide Perovskite Artificial Synapses (Adv. Mater. 28/2016) (page 6019)

    Wentao Xu, Himchan Cho, Young-Hoon Kim, Young-Tae Kim, Christoph Wolf, Chan-Gyung Park and Tae-Woo Lee

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adma.201670196

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    A synapse-emulating electronic device based on organometal halide perovskite thin films is described by T.-W. Lee and co-workers on page 5916. The device successfully emulates important characteristics of a biological synapse. This work extends the application of organometal halide perovskites to bioinspired electronic devices, and contributes to the development of neuromorphic electronics.

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    Stretchable Electronic Devices: PDMS-Based Elastomer Tuned Soft, Stretchable, and Sticky for Epidermal Electronics (Adv. Mater. 28/2016) (page 5765)

    Seung Hee Jeong, Shuo Zhang, Klas Hjort, Jöns Hilborn and Zhigang Wu

    Version of Record online: 21 JUL 2016 | DOI: 10.1002/adma.201670191

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    On page 5830, Z. G. Wu and co-workers develop a novel approach to make poly(dimethylsiloxane) (PDMS)-based elastomer soft, stretchable and sticky by introducing a small fraction of ethoxylated polyethylenimine (PEIE). Around the PEIE chains, the crosslinking of the elastomer is hindered and results in a gradient of crosslinking density, and hence heterogeneous crosslinked networks. These liquid-like, loosely crosslinked domains in a highly crosslinked network enable higher compliance and larger elongation at break, accompanied by a surface that is highly adhesive to human skin.