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Hybrid Co3O4/SnO2 Core–Shell Nanospheres as Real-Time Rapid-Response Sensors for Ammonia Gas

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State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
*E-mail: [email protected]. Tel.: +86 431 85168385. Fax: +86 431 85168270.
Cite this: ACS Appl. Mater. Interfaces 2016, 8, 10, 6539–6545
Publication Date (Web):March 4, 2016
Copyright © 2016 American Chemical Society

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    Novel hybrid Co3O4/SnO2 core–shell nanospheres have been effectively realized by a one-step hydrothermal, template-free preparation method. Our strategy involves a simple fabrication scheme that entails the coating of natural cross-link agents followed by electrostatic interaction between the positive charges of Sn and Co ions and the negative charge of glutamic acid. The core–shell architecture enables novel flexibility of gas sensor surfaces compared to commonly used bulk materials. The highly efficient charge transfer and unique structure are key to ensuring the availability of high response and rapid-response speed. It demonstrates how hybrid core–shell nanospheres can be used as an advance function material to fabricate electrical sensing devices that may be useful as gas sensors.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.6b00305.

    • Further experimental details on the fabrication of gas sensors, STEM images, EDX mapping images, a nitrogen adsorption–desorption isotherm, and a detailed sensing performance of sensing materials (PDF)

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