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  1. Exciton Recombination in Formamidinium Lead Triiodide: Nanocrystals versus Thin Films

    Hong-Hua Fang, Loredana Protesescu, Daniel M. Balazs, Sampson Adjokatse, Maksym V. Kovalenko and Maria Antonietta Loi

    Version of Record online: 22 JUN 2017 | DOI: 10.1002/smll.201700673

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    The newly developed formamidinium lead triiodide (FAPbI3) nanocrystals (NCs) show quantum yield above 70% with a large absorption cross-section (5.2 × 10−13 cm−2). Biexcitonic recombination is observed, featuring a slow recombination lifetime of 0.4 ns. The optical properties of the NC ensemble are further compared with their polycrystalline thin film counterpart, showing two very distinct recombination mechanisms.

  2. Adjusting the Chemical Bonding of SnO2@CNT Composite for Enhanced Conversion Reaction Kinetics

    Yayi Cheng, Jianfeng Huang, Hui Qi, Liyun Cao, Jun Yang, Qiao Xi, Xiaomin Luo, Kazumichi Yanagisawa and Jiayin Li

    Version of Record online: 22 JUN 2017 | DOI: 10.1002/smll.201700656

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    Sn[BOND]C bonds provide more direct e transfer way than Sn[BOND]O[BOND]C bonds, resulting in enhanced conversion reaction kinetics that Sn and Li2O can reverse back to SnO2. Different content of Sn[BOND]C and Sn[BOND]O[BOND]C bonds is controlled in the synthesis of SnO2@CNT composite. It is found that the SnO2@CNTs with more Sn[BOND]C bond display highly reversible conversion reaction. Since the Sn[BOND]C bond can provide ultrafast electron transfer path during lithiation/delithiation, facilitating the reversible conversion reaction between Sn and Li2O to form SnO2.

  3. Integration of Biomolecules with Metal–Organic Frameworks

    Jia Zhuang, Allison P. Young and Chia-Kuang Tsung

    Version of Record online: 22 JUN 2017 | DOI: 10.1002/smll.201700880

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    Integrating biomolecules into metal–organic-frameworks (MOFs) has recently gain considerable attention, owing to the progressive development of MOFs synthetic proceedings in last decade. Biomolecules, including lipids, oligopeptides, nucleic acids, and proteins have been readily incorporated into MOF systems via versatile formulation methods. The formed biomolecule-MOF hybrid structures have shown promising prospects in various fields, such as antitumor treatment, gene delivery, biomolecular sensing, and nanomotor device.

  4. Defective Tungsten Oxide Hydrate Nanosheets for Boosting Aerobic Coupling of Amines: Synergistic Catalysis by Oxygen Vacancies and Brønsted Acid Sites

    Ning Zhang, Xiyu Li, Yifei Liu, Ran Long, Mengqiao Li, Shuangming Chen, Zeming Qi, Chengming Wang, Li Song, Jun Jiang and Yujie Xiong

    Version of Record online: 22 JUN 2017 | DOI: 10.1002/smll.201701354

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    A facile bottom-up approach is developed to synthesize defective tungsten oxide hydrate (WO3·H2O) nanosheets. Oxygen vacancies supply coordinatively unsaturated sites to activate O2 molecules, while Brønsted acid sites efficiently adsorb amine molecules via strong hydrogen bonds. This synergistic effect boosts the catalytic activity for aerobic coupling of amines.

  5. Luminescence of a Transition Metal Complex Inside a Metamaterial Nanocavity

    Timothy U. Connell, Stuart K. Earl, Charlene Ng, Ann Roberts, Timothy J. Davis, Jonathan M. White, Anastasios Polyzos and Daniel E. Gómez

    Version of Record online: 22 JUN 2017 | DOI: 10.1002/smll.201700692

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    The nanocavity of a novel metamaterial that supports several optical modes enables increased luminescence from an organometallic iridium(III) complex, a hybrid magnetic/electric-dipole emitter. The mechanism for the strong modification to the emission spectrum and spontaneous decay rates is rationalized through analysis of momentum- and time-resolved spectroscopy experiments.