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Exciton transfer dynamics between graphene quantum dots and MXene explored by transient absorption spectroscopy and
Ruixiang Wu1, Yujing Wang1, Rongli Guo1
1College of Physics and Electronic Engineering, Shanxi Normal University, Taiyuan 030031, China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|December 23, 2025
Summary
Graphene quantum dots (GQDs) and Ti3C2Tx MXene exhibit unique optical properties. A new method using transient absorption spectroscopy detects Ti3C2Tx MXene with high sensitivity.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Graphene quantum dots (GQDs) possess excellent optical and electronic properties, making them suitable for optoelectronic applications.
- Aminated GQDs exhibit distinct emission characteristics, including edge and amino group-induced emissions.
- Transient absorption (TA) spectroscopy reveals stimulated emission and photoinduced absorption features related to edge states and amino groups.
Purpose of the Study:
- To investigate the interaction between GQDs and Ti3C2Tx MXene.
- To explore the potential of TA spectroscopy for detecting Ti3C2Tx MXene.
- To develop a sensitive method for MXene detection.
Main Methods:
- Utilizing transient absorption (TA) spectroscopy to analyze GQD-MXene interactions.
- Observing photoluminescence (PL) quenching and defect emission upon MXene addition.
- Correlating changes in the lifetime ratio (R_P-S) with Ti3C2Tx concentration.
Main Results:
- Ti3C2Tx MXene induces photoluminescence quenching in GQDs by trapping electrons.
- MXene decomposes amino functional groups in GQDs, leading to defect emission.
- The lifetime ratio R_P-S at 470 nm shifts from -8.73 to -1.00 with increasing Ti3C2Tx concentration.
- A TA-based method achieved a detection sensitivity of 121.39 mL/mg for Ti3C2Tx MXene.
Conclusions:
- The interaction between GQDs and Ti3C2Tx MXene leads to observable spectral changes.
- TA spectroscopy provides a highly sensitive method for detecting Ti3C2Tx MXene, outperforming PL quenching.
- This study demonstrates a novel approach for sensitive MXene quantification using nanomaterial interactions.
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