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  1. In-Plane 2H-1T′ MoTe2 Homojunctions Synthesized by Flux-Controlled Phase Engineering

    Youngdong Yoo, Zachary P. DeGregorio, Yang Su, Steven J. Koester and James E. Johns

    Version of Record online: 21 FEB 2017 | DOI: 10.1002/adma.201605461

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    In-plane 2H-1T′ MoTe2 homojunctions are synthesized from Mo nanoislands by flux-controlled phase engineering. Few-layer 2H MoTe2 is formed with high Te flux, while few-layer 1T′ MoTe2 is obtained with low Te flux. Kelvin probe force microscopy confirms that in-plane 2H-1T′ MoTe2 homojunctions synthesized with medium flux have an abrupt potential difference of ≈100 mV across the junctions.

  2. Reconfigurable Microscale Frameworks from Concatenated Helices with Controlled Chirality

    Seog-Jin Jeon and Ryan C. Hayward

    Version of Record online: 21 FEB 2017 | DOI: 10.1002/adma.201606111

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    A method for the fabrication of microscale helices is reported and formation of reconfigurable frameworks from concatenated multiple helices with controlled chirality is demonstrated. Block angles, torsion angles, and lengths of each segment are reliably controlled using simple geometric design rules, enabling the formation of defined 3D shapes, thus opening new directions in responsive shape-programmable materials.

  3. Hybrid Nanoparticle Pyramids for Intracellular Dual MicroRNAs Biosensing and Bioimaging

    Si Li, Liguang Xu, Maozhong Sun, Xiaoling Wu, Liqiang Liu, Hua Kuang and Chuanlai Xu

    Version of Record online: 21 FEB 2017 | DOI: 10.1002/adma.201606086

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    Multifunctional nanopyramids have been fabricated using Au-Cu9S5, Ag2S, and upconversion nanoparticles, which emit reliable up and down conversion luminescence signals simultaneously. They are applied to ultrasensitive detection of dual microRNAs in living cells. Significantly, the miR-responsive duplexed bioimage sensing has been successfully achieved in a tumor-bearing animal model at a single excitation.

  4. Dynamic Covalent Polymer Networks: from Old Chemistry to Modern Day Innovations

    Weike Zou, Jiante Dong, Yingwu Luo, Qian Zhao and Tao Xie

    Version of Record online: 21 FEB 2017 | DOI: 10.1002/adma.201606100

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    Dynamic covalent polymer networks have received significant attention over many years. Their covalent and adaptive nature has placed them uniquely between thermoplastic and thermoset polymers. This progress report briefly discusses the historical development of these polymer networks, focusing mainly on the latest advances that open up unprecedented opportunities in material innovations, particularly in the area of smart adaptive materials.

  5. Heterojunction Photocatalysts

    Jingxiang Low, Jiaguo Yu, Mietek Jaroniec, Swelm Wageh and Ahmed A. Al-Ghamdi

    Version of Record online: 21 FEB 2017 | DOI: 10.1002/adma.201601694

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    Heterojunction photocatalysts attract a lot of attention because of their effectiveness for spatial separation of photogenerated electron–hole pairs. Therefore, various types of heterojunction photocatalyst are applied in different photocatalytic fields, including H2 production, CO2 reduction, and pollutant degradation. The development of heterojunction photocatalysts can lead to significant advancements in the photocatalysis field.