Fluorescent and Electrochemical Sensor Based on Basic Red 9 Dye Functionalised Graphene Oxide-Montmorillonite Composite for Selective Detection of Cerium (III) Ion

Sarojmoni Kalita; Diganta Kumar Das

doi:10.1007/s10895-023-03570-z

Fluorescent and Electrochemical Sensor Based on Basic Red 9 Dye Functionalised Graphene Oxide-Montmorillonite Composite for Selective Detection of Cerium (III) Ion

J Fluoresc. 2023 Dec 29. doi: 10.1007/s10895-023-03570-z. Online ahead of print.

Authors

Sarojmoni Kalita¹, Diganta Kumar Das²

Affiliations

¹ Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India. sarojmoni23@gmail.com.
² Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India.

PMID: 38157086
DOI: 10.1007/s10895-023-03570-z

Abstract

In this work, graphene oxide (GO) has been prepared from used dry cells using modified Hummer's method and encapsulated with montmorillonite clay. To enhance its electrical property, the GO-MMT composite has been functionalised with Basic Red 9 dye. The sensor was characterized by various spectroscopic techniques like FT-IR spectroscopy, PXRD, SEM analysis, etc. Basic Red 9 dye functionalised GO-MMT composite has been employed for fluorescent and electrochemical detection of Ce³⁺ ion. The fluorescent turn-on sensing is sensitive, reversible and free from interference from other metal ions. The detection of Ce³⁺ ion by the sensor was also conducted in bovine serum albumin (BSA) medium. Pt electrode modified with the hybrid sensor produces excellent electrochemical change in presence of Ce³⁺ ion through cyclic voltammetry and square wave voltammetry technique. The limit of detection (LOD) from fluorescence spectroscopy, cyclic voltammetry and square wave voltammetry were calculated to be 0.6556 × 10^{- 9} M, 1.232 × 10^{- 9} M and 1.923 × 10^{- 9} M respectively.

Keywords: Cyclic voltammetry; Electrochemistry; Fluorescence spectroscopy; Graphene oxide; Graphene oxide-montmorillonite-dye composite; Metal sensor.