Transient absorption study on fluorescence quenching of InP/ZnS quantum dots by MXene

Ruixiang Wu; Xin Liu; Xiaoshuai Wang; Fengjie Guo; Shengzhi Wang; Bin Li; Liu-Yong Cheng; Xiangyang Miao

doi:10.1016/j.saa.2023.123359

Transient absorption study on fluorescence quenching of InP/ZnS quantum dots by MXene

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 5:304:123359. doi: 10.1016/j.saa.2023.123359. Epub 2023 Sep 6.

Authors

Ruixiang Wu¹, Xin Liu², Xiaoshuai Wang², Fengjie Guo², Shengzhi Wang², Bin Li², Liu-Yong Cheng², Xiangyang Miao³

Affiliations

¹ Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China. Electronic address: wuruixiang@sxnu.edu.cn.
² Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China.
³ Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China. Electronic address: xymiao@sxnu.edu.cn.

PMID: 37690400
DOI: 10.1016/j.saa.2023.123359

Abstract

Fluorescence quenching due to energy transfer from InP/ZnS quantum dots (QDs) to Ti₃C₂T_x MXene materials was investigated by the transient absorption spectroscopy. During the fluorescence quenching, the photo-induced absorption feature in the transient spectrum was blue-shifted due to the higher photon energy required for the upward transition. The lifetime of stimulated emission was gradually extended from 0.86 μs to 2.28 μs with increasing Ti₃C₂T_x MXene. The fluorescence quenching of QDs can be quantitatively characterized by analyzing the lifetime of the stimulated emission feature in the transient absorption spectrum, which was used as a Ti₃C₂T_x MXene detection with the sensitivity of 6.63 mL/mg. The results of this study provide the basis for the design of optical sensors.

Keywords: Energy transfer; Fluorescence quenching; MXene; Quantum dots; Transient absorption spectroscopy.