Advanced Functional Materials

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  1. Transferred, Ultrathin Oxide Bilayers as Biofluid Barriers for Flexible Electronic Implants

    Enming Song, Yoon Kyeung Lee, Rui Li, Jinghua Li, Xin Jin, Ki Jun Yu, Zhaoqian Xie, Hui Fang, Yiding Zhong, Haina Du, Jize Zhang, Guanhua Fang, Yerim Kim, Younghee Yoon, Muhammad A. Alam, Yongfeng Mei, Yonggang Huang and John A. Rogers

    Version of Record online: 20 JUL 2017 | DOI: 10.1002/adfm.201702284

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    Ultrathin, transferred oxide bilayers that are impermeable to both water and ions serve as compatible biointerfaces and robust biofluid barriers with multidecade lifetimes. An optimized strategy exploits a hafnium oxide layer formed by atomic layer deposition on a thermal silicon dioxide layer, both on top of flexible electronics. The findings offer relevance to diverse ranges of biointegrated implantable devices.

  2. Inorganic Acid-Impregnated Covalent Organic Gels as High-Performance Proton-Conductive Materials at Subzero Temperatures

    Hong Zhong, Zhihua Fu, Jared M. Taylor, Gang Xu and Ruihu Wang

    Version of Record online: 20 JUL 2017 | DOI: 10.1002/adfm.201701465

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    Covalent organic gels (COGs) can serve as a type of new subzero-temperature proton-conductive material. The COGs not only show high proton conductivities and excellent long-term stability over the temperature range of −40 to 60 °C, but also possess remarkable self-sustaining nature and superior processability.

  3. ATP-Responsive Aptamer-Based Metal–Organic Framework Nanoparticles (NMOFs) for the Controlled Release of Loads and Drugs

    Wei-Hai Chen, Xu Yu, Wei-Ching Liao, Yang Sung Sohn, Alessandro Cecconello, Anna Kozell, Rachel Nechushtai and Itamar Willner

    Version of Record online: 20 JUL 2017 | DOI: 10.1002/adfm.201702102

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    Stimuli-responsive DNA-functionalized metal–organic framework nanoparticles (NMOFs): The synthesis of NMOFs loaded with doxorubicin and capped with stimuli-responsive DNAs that respond to biomarkers characteristic to cancer cells is described. By locking the drug-loaded NMOFs with a DNA strand consisting of the AS1411 aptamer and the ATP aptamer, targeted permeation of the NMOFs into cancer cells, the ATP-driven unlocking of the NMOFs, and drug release are demonstrated.

  4. Self-Templated Fabrication of CoO–MoO2 Nanocages for Enhanced Oxygen Evolution

    Fenglei Lyu, Yaocai Bai, Zhiwei Li, Wenjing Xu, Qingfa Wang, Jing Mao, Li Wang, Xiangwen Zhang and Yadong Yin

    Version of Record online: 20 JUL 2017 | DOI: 10.1002/adfm.201702324

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    A novel self-templating strategy is developed for the fabrication of composite CoO–MoO2 nanocages with enhanced oxygen evolution reaction (OER) performance. The enhanced OER performance can be attributed to the enlarged electrochemically active surface area and favorable charge transfer due to the incorporation of Mo species. This strategy provides great opportunities for the design and synthesis of mixed metal oxides for electrochemical applications.

  5. A Materials Roadmap to Functional Neural Interface Design

    Steven M. Wellman, James R. Eles, Kip A. Ludwig, John P. Seymour, Nicholas J. Michelson, William E. McFadden, Alberto L. Vazquez and Takashi D. Y. Kozai

    Version of Record online: 19 JUL 2017 | DOI: 10.1002/adfm.201701269

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    Neural interface engineering aims to apply advanced functional materials to seamlessly integrate neural technology with the nervous system in order to restore brain function in patients and uncover at least some of the brain's mysteries. This review highlights the challenges and interdependence of material components for long-term functional performance, and compiles a “roadmap” to guide material-based neural interface engineering.

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