La-CoOx/N/C Nanocomposites Derived from Carbon Black-Loaded ZIF-67 for Low-Temperature Detection of MethaneClick to copy article linkArticle link copied!
- Yuxiang Qin*Yuxiang Qin*Email: [email protected]School of Microelectronics, Tianjin University, Tianjin 300072, ChinaTianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin 300072, ChinaMore by Yuxiang Qin
- Siyu Li
- Jinbang ZhangJinbang ZhangSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaMore by Jinbang Zhang
Abstract

Conventional metal oxide semiconductor (MOS) gas sensors have an inherent disadvantage of high operating temperatures and low sensitivity to weakly polarized gases, such as methane. This study mainly focuses on developing specialized MOS-based gas sensors for the highly sensitive detection of methane. Therefore, we designed and prepared Co3O4-based nanocomposites of La-CoOx/N/C via the pyrolysis of a La-doped zeolitic imidazolate framework (ZIF-67) hydrothermally grown on carbon black (CB) nanospheres. The resulting La-CoOx/N/C material is dominated by hollow nanospheres, owing to CB pyrolysis. In the as-formed nanocomposite, the dispersed La2O3 acts as a “fence” to prevent the agglomeration of Co3O4 nanoparticles and form rich heterojunctions. Meanwhile, N-coordinated carbon (N/C) acts as an anchor for La-CoOx attachment, which further improves the dispersion of the composite oxides and enhances their adsorption capacity for methane molecules. Consequently, the La-CoOx/N/C sensor demonstrated a response of 1.25 with 4/5 s recovery/response times for 600 ppm of methane at a relatively low temperature (130 °C). Furthermore, a methane-sensing mechanism is demonstrated based on heterostructure effects and first-principles calculations. The proposed La-CoOx/N/C gas sensor is a device that exhibits excellent methane sensing performance at low temperatures without requiring precious metals.
Cited By
This article has not yet been cited by other publications.
Article Views
Altmetric
Citations
Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.
Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.
The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated.