Singh, Vijay K. and Mishra, Himanshu and Ali, Rashid and Umrao, Sima and Srivastava, Rajesh and Abraham, Shiju and Misra, Arvind and Singh, Vidya Nand and Mishra, Hirdyesh and Tiwari, R. S. and srivastava, Anchal (2019) In Situ Functionalized Fluorescent WS2-QDs as Sensitive and Selective Probe for Fe3+ and a Detailed Study of Its Fluorescence Quenching. ACS Applied Nano Material, 2 (1). 566-+1- 566-+11. ISSN 2574-0970

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Abstract

Most of the reports suggest that liquid exfoliated WS2-QDs are unstable; therefore the need of present day is to develop a novel synthesis route for producing long-term stable WS2-QDs. Herein, we report a bottom-up single-step hydrothermal growth of in situ functionalized blue fluorescent WS2-QDs with stable fluorescence in aqueous media without subsequent treatments. Presence of various functional groups over the surface of f-WS2-QDs provides high solubility and stability to f-WS2-QDs in aqueous media preserving its fluorescence. Further, photoluminescence property of f-WS2-QDs has been employed to devise an optical sensor with a high sensitivity (K-D similar to 10(4) M-1) and selectivity for ferric (Fe3+) ions. Under the optimal condition, response of the sensor is found to be linear in the range of 0-55 mu M with a limit of detection (LOD) of 1.32 mu M, which is within the maximum permissible level of Fe3+ (similar to 5.4 mu M) in human drinking water by the USEPA. Further, we have also carried out a detailed evaluation on fluorescence quenching kinetics of f-WS2-QDs. Nonlinear behavior of S-V plot and TRPL measurements suggest that quenching is a mixed phenomenon of dynamic as well as static processes. Finally we have proposed a mechanism for fluorescence quenching of f-WS2-QDs in the presence of Fe3+.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Chemical Society.
Subjects:	Materials Science Nanoscience/ Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	19 Aug 2026 11:46
Last Modified:	19 Aug 2026 11:46
URI:	https://npl.csircentral.net/id/eprint/4384

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