Preparation of reduced graphene oxide/Co3O4 composites and sensing performance to toluene at low temperature

Shouli Bai; Long Du; Jianhua Sun; Ruixian Luo; Dianqing Li; Aifan Chen; Chung-Chiun Liu

doi:10.1039/C6RA06542B

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature

Shouli Bai,^a Long Du,^a Jianhua Sun,^a Ruixian Luo,^a Dianqing Li,*^a Aifan Chen*^a and Chung-Chiun Liu^b

* Corresponding authors

^a State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Environmentally Harmful Chemicals Analysis, Beijing University of Chemical Technology, Beijing 100029, China
E-mail: chenaf@mail.buct.edu.cn

^b Department of Chemical and Biomolecular Engineering, Case Western Reserve University, OH 44106, USA

Abstract

Although the gas sensing properties of p-type semiconductors (such as Co₃O₄) generally are lower than those of n-type oxide semiconductors, high quality gas sensors can still be designed by various modified methods due to their distinctive surface reactivity. In the work, the rGO/Co₃O₄ composites with different formulations have been successfully synthesized by a facile hydrothermal reaction. The morphology, structure and composition of as-prepared composites were characterized by XRD, FESEM, Raman, TG, XPS spectrum and BET analysis, respectively. The sensing tests indicate that the 5 wt% rGO composite to toluene not only exhibits the highest response and excellent selectivity, but also has linear response in concentration lower 5 ppm, indicating the composite is a promising sensing material for detection of toluene. Furthermore, the mechanism of rGO enhanced composite gas sensing is also discussed in detail, which is attributed to rGO action in composite and the formation of p–p isotype heterojunction at the interface between rGO and Co₃O₄.

Article information

https://doi.org/10.1039/C6RA06542B

Article type

Paper

Submitted

11 Mar 2016

Accepted

13 Jun 2016

First published

15 Jun 2016

Download Citation

RSC Adv., 2016,6, 60109-60116

Permissions

Request permissions

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature

S. Bai, L. Du, J. Sun, R. Luo, D. Li, A. Chen and C. Liu, RSC Adv., 2016, 6, 60109 DOI: 10.1039/C6RA06542B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

RSC Advances

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature

Abstract

Article information

Download Citation

Permissions

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature

Social activity

Search articles by author

Spotlight

Advertisements