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Biocarbon-templated synthesis of porous Ni–Co-O nanocomposites for room-temperature NH3 sensors

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Abstract

In this study, a mesoporous biocarbon material (BCM) with connected pore channels and a large specific surface area (525.83 m2 g−1) was prepared by a carbonization approach with inexpensive hemp stem as the raw material. The BCM was used as a template to fabricate porous nickel–cobalt oxide (Ni–Co-O) nanocomposite structures in situ. The composition of the Ni–Co-O nanocomposites was readily controlled by adjusting the Co-to-Ni ratio of the initial nickel and cobalt nitrates. Furthermore, we constructed porous Ni–Co-O nanocomposite-based sensors. The room-temperature (RT) NH3 sensing results indicated that the sensor with the best performance exhibited a high response of 3 to 100 ppm, a low detection limit of 50 ppb, good stability (higher than 7 weeks), and excellent reversibility and selectivity. Therefore, the Ni–Co-O nanocomposite, featuring a large specific surface area and meso/micropore distributions, is a strong candidate as a key material for the fabrication of RT NH3 detection sensors.

Graphical abstract: Biocarbon-templated synthesis of porous Ni–Co-O nanocomposites for room-temperature NH3 sensors

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Publication details

The article was received on 31 Jul 2018, accepted on 12 Sep 2018 and first published on 20 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ03832E
Citation: New J. Chem., 2018, Advance Article
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    Biocarbon-templated synthesis of porous Ni–Co-O nanocomposites for room-temperature NH3 sensors

    H. Liu, H. Lv, K. Kan, Y. Liu, W. Zhang, Y. Wang, M. Ikram, L. Du, K. Shi and H. Yu, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ03832E

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