Ultrasensitive photoelectrochemical platform with micro-emulsion-based p-type hollow silver iodide enabled by low solubility product (K_(sp)) for H₂S sensing
- Creators
- Ye, Cui
- Xu, Fan
- Wu, Zhen
- Gao, Zhong Feng
- Wang, Minqiang
Abstract
Since visible-light (VL) accounting for massive solar radiation energy, a large amount of attention has been paid to the development of highly efficient visible-light-driven (VLD) semiconductor materials. However, despite recent efforts to construct VL active material, hollow structure-based silver iodide (AgI) with appropriate band gap and a large surface area are limited because of lack of a proper synthesis method. Herein, hollow AgI with p-type semiconductor behavior is constructed on the basis of micro-emulsion strategy, which enables admirable cathode photoelectrochemical (PEC) response. The as-prepared hollow AgI is applied to fabricate the PEC sensing platform and reveals a low limit of detection of 0.04 fM and a wide dynamic range up to 5 orders of magnitude toward H₂S. The PEC sensing mechanism is supposed to the 'signal-off' pattern on account of the ultralow solubility product (K_(sp)) of Ag₂S, derived from the precipitation reaction due to the high affinity between sulfide ion and Ag⁺. Besides, the hollow structure of AgI provides sufficient surface area for in situ producing Ag₂S that serves as recombination center of carrier, thus causing the efficient quenching of photocurrent signals. This work broadens the horizon of structuring VLD semiconductor nanomaterials and K_(sp)-based H₂S sensing.
Additional Information
© 2021 IOP Publishing Ltd. Received 12 May 2021, revised 8 June 2021; Accepted for publication 1 July 2021; Published 19 July 2021. This work was supported by the National Natural Science Foundation of China (Grant No. 21904116, 31800829), and the China Postdoctoral Science Foundation (2021M692863). Data availability statement: All data that support the findings of this study are included within the article (and any supplementary files). Credit authorship contribution statement: Cui Ye: Writing-review &editing, funding acquisition, supervision. Fan Xu and Zhen Wu: Writing-original draft, data curation. ZhongFeng Gao: Formal analysis, funding acquisition. Minqiang Wang: Writing—review & editing, formal analysis. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Attached Files
Accepted Version - Ye+et+al_2021_Nanotechnology_10.1088_1361-6528_ac1094.pdf
Supplemental Material - nanoac1094supp1.pdf
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Additional details
- Alternative title
- Ultrasensitive photoelectrochemical platform with micro-emulsion-based p-type hollow silver iodide enabled by low solubility product (Ksp) for H2S sensing
- Eprint ID
- 109792
- DOI
- 10.1088/1361-6528/ac1094
- Resolver ID
- CaltechAUTHORS:20210713-210932714
- 21904116
- National Natural Science Foundation of China
- 31800829
- National Natural Science Foundation of China
- 2021M692863
- China Postdoctoral Science Foundation
- Created
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2021-07-13Created from EPrint's datestamp field
- Updated
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2022-07-12Created from EPrint's last_modified field