In Situ Functionalized Fluorescent WS2-QDs as Sensitive and Selective Probe for Fe3+ and a Detailed Study of Its Fluorescence Quenching

Vijay K. Singh, Himanshu Mishra, Rashid Ali, Sima Umrao, Rajesh Srivastava, Shiju Abraham, Arvind Misra, Vidya Nand Singh, Hirdyesh Mishra, R. S. Tiwari, Anchal Srivastava

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

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 (KD ∼104 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 μM with a limit of detection (LOD) of 1.32 μM, which is within the maximum permissible level of Fe3+ (∼5.4 μM) 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.

Original languageEnglish
Pages (from-to)566-576
Number of pages11
JournalACS Applied Nano Materials
Volume2
Issue number1
DOIs
StatePublished - 25 Jan 2019

Keywords

  • TRPL
  • WS
  • fluorescence quenching
  • hydrothermal synthesis
  • quantum dots
  • quantum yield

ASJC Scopus subject areas

  • General Materials Science

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