Biocarbon-templated synthesis of porous Ni–Co-O nanocomposites for room-temperature NH3 sensors. (10th October 2018)

• Record Type: Journal Article
• Authors: Liu, Huan; Lv, He; Kan, Kan; Liu, Yang; Zhang, Weijun; Wang, Yang; Ikram, Muhammad; Du, Lijuan; Shi, Keying; Yu, Hai-tao
• Is Part Of: New journal of chemistry. Volume 42:Number 21(2018)
• Page Start: 17606
• Page End: 17614
• Publication Date: 2018-10-10
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj03832e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Mesoporous nickel–cobalt oxide (Ni–Co-O) nanocomposites were fabricated using a mesoporous biocarbon material (BCM), resulting from hemp stem, as a template. Abstract : In this study, a mesoporous biocarbon material (BCM) with connected pore channels and a large specific surface area (525.83 m 2 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.