Growth of AgI semiconductors on tailored 3D porous Ti3C2 MXene/graphene oxide aerogel to develop sensitive and selective "signal-on" photoelectrochemical sensor for H2S determination

Qi Zhang; Chengquan Wang; Yunmeng Tian; Yue Liu; Fuheng You; Kun Wang; Jie Wei; Lingliang Long; Jing Qian

doi:10.1016/j.aca.2023.340845

Growth of AgI semiconductors on tailored 3D porous Ti₃C₂ MXene/graphene oxide aerogel to develop sensitive and selective "signal-on" photoelectrochemical sensor for H₂S determination

Anal Chim Acta. 2023 Mar 8:1245:340845. doi: 10.1016/j.aca.2023.340845. Epub 2023 Jan 17.

Authors

Qi Zhang¹, Chengquan Wang², Yunmeng Tian¹, Yue Liu¹, Fuheng You¹, Kun Wang¹, Jie Wei¹, Lingliang Long¹, Jing Qian³

Affiliations

¹ School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China.
² School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, PR China. Electronic address: wangcq@ujs.edu.cn.
³ School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China. Electronic address: qianj@ujs.edu.cn.

PMID: 36737133
DOI: 10.1016/j.aca.2023.340845

Abstract

Long term exposure to hydrogen sulfide (H₂S) even in low concentration poses a serious threat to human health and the ecosystem, pointing to the significance for its effective supervision. In this study, we report a sensitive and selective "signal-on" photoelectrochemical (PEC) sensor for the determination of toxic H₂S in aqueous solution by in situ growth of AgI semiconductors on tailored three-dimensional (3D) porous Ti₃C₂ MXene/graphene oxide aerogel (MGA). Our research demonstrated that the resultant MGA with the starting feeding mass ratio of MXene and graphene oxide (GO) of 1:8 (MGA_1:8) possessed the most excellent PEC performance after the growth of AgI semiconductors than their monomers (Ti₃C₂ MXene and GO) and the MGAs with other starting feeding mass ratio. Such designed PEC sensor based on MGA_1:8/AgI heterojunction showed dramatically strengthened PEC responses with increasing concentrations of S^2-. Correspondingly, a wide linear range of 5 nM-200 μM, a low limit of detection of 1.54 nM (S/N = 3), and exclusively unique selectivity have been achieved. Our research illustrates that the PEC sensor designed with tailored MGA constitutes is an effective pathway to enhance the overall sensing performance, which will envision to boost more efforts for advanced 3D porous aerogel using in PEC sensors.

Keywords: AgI semiconductor; H(2)S; MXene/graphene oxide aerogel; Photoelectrochemical sensor.