Issue 38, 2021

Bimetallic organic framework-derived SnO2/Co3O4 heterojunctions for highly sensitive acetone sensors

Abstract

Porous structures and heterogeneous compositions are highly desirable to achieve improved sensing performance. Herein, a SnO2/Co3O4 composite with catalytic sites and abundant oxygen vacancies has been successfully synthesized by pyrolyzation of Sn- and Co-based bimetallic organic frameworks (bMOFs). The composites demonstrate desirable p–n heterojunctions, which was confirmed by diffuse reflection ultraviolet–visible spectroscopy (DRS) and Mott–Schottky (M–S) plots. Gas-sensing experiments reveal that the response of SnO2/Co3O4 composites (Sn/Co = 2 : 1, atomic ratio) reaches 498 to 50 ppm acetone, which is about 5 times higher than that of the pure SnO2. Moreover, the composites exhibit better selectivity and stability at an operating temperature of 275 °C. This excellent performance is attributed to the synergistic effect of catalysis of Co3+ and the formation of p–n heterojunctions at the interface between Co3O4 and SnO2.

Graphical abstract: Bimetallic organic framework-derived SnO2/Co3O4 heterojunctions for highly sensitive acetone sensors

Supplementary files

Article information

Article type
Paper
Submitted
20 Jun 2021
Accepted
25 Aug 2021
First published
25 Aug 2021

New J. Chem., 2021,45, 18150-18157

Bimetallic organic framework-derived SnO2/Co3O4 heterojunctions for highly sensitive acetone sensors

L. Sun, X. Yuan, J. Sun, K. Zhang, D. Liao and S. Chen, New J. Chem., 2021, 45, 18150 DOI: 10.1039/D1NJ03025F

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