KMS Chongqing Institute of Green and Intelligent Technology, CAS
Triggering "signal-on" photoelectrochemical responses by heterojunction transition for selective detection of copper(II) based on Pd/ MoS2@g-C3N4 nanocomposites | |
Chen, Xi1,2; Huang, Haicai1,2; Wu, Qingping1,2; Xue, Fei1,2; Zhao, Ziming1,2; Liu, Jingqiu1,2; Duan, Haoyu1,2; Chen, Houyang1,2 | |
2023-12-01 | |
摘要 | Controlling the concentration of copper(II) in aquatic systems is of importance for human health. Numerous traditional technologies to detect Cu2+ may encounter with limitations, such as high signal background and complicated operation. Herein, a highly selective photoelectrochemical (PEC) sensor is proposed for the "signal -on" detection of Cu2+ employing g-C3N4 nanosheets with MoS2 and Pd quantum dots deposited (Pd/MoS2@g-C3N4). Pd/MoS2@g-C3N4 could present the enhanced photocurrents of specific responses to Cu2+ under light irradiation. MoS2 quantum dots on the sensor are agglomerated into MoS2 bulk during sensing Cu2+, forming an efficient Z-scheme heterojunction. The heterojunction transition induced photoelectrons transferring from the bulk MoS2 to g-C3N4, resulting in "signal-on" PEC responses. Such Z-scheme heterojunction has conquered the traditional heterojunction towards "signal-on" mechanism, that was further verified by band structure measurements and DMPO spin trapping ESR analysis. Photocurrent intensities increased gradually with the addition of incremental Cu2+ concentrations, achieving a detection limit of 0.21 mu M and a broad linear interval range from 1 mu M to 1 mM with high selectivity and stability. This work may open a new door towards the in situ construction of g-C3N4-based Z-scheme heterojunctions for the signal-on PEC sensing platform, providing wide applications in environmental monitoring and food safety. |
关键词 | Photoelectrochemistry "Signal-on" response Z-Scheme pathway Heterojunction transition Cu2+detection |
DOI | 10.1016/j.aca.2023.341940 |
发表期刊 | ANALYTICA CHIMICA ACTA |
ISSN | 0003-2670 |
卷号 | 1283页码:11 |
通讯作者 | Chen, Houyang(chenhouyang@cigit.ac.cn) |
收录类别 | SCI |
WOS记录号 | WOS:001102300100001 |
语种 | 英语 |