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摘要: 采用改进的Humer法合成了石墨烯氧化物，利用搭建的时间分辨光谱探测系统详细探究了Fe3+（浓度为0.5、1、2 mmol/L）对石墨烯氧化物荧光淬灭物理机制。稳态荧光发射光谱中，随着Fe3+浓度的增加，石墨烯氧化物的荧光强度急剧减弱。时间分辨荧光光谱和飞秒瞬态吸收光谱研究证实，加入不同浓度Fe3+的GO其动力学衰减曲线基本没有任何变化。结果表明，Fe3+对石墨烯氧化物的荧光淬灭主要是静态的荧光淬灭过程。Abstract: The graphene oxide(GO) is synthesized by the improved Hummer method. The fluorescence quenching mechanism of graphene oxide by Fe3+(0.5, 1, 2 mmol/L) in detail is studied using the time-resolved spectrometry probe system. From the steady photoluminescence emitting spectra, the fluorescence intensity of GO decreased dramatically as the Fe3+ concentration increased. From the time-resolved fluorescence spectra and femtosecond transient absorption spectra, the dynamic decay curves have no extinctive changes for GO with different Fe3+ concentrations. It is proved that the fluorescence quenching mechanism of GO by Fe3+ is mainly ascribed to the static fluorescence quenching.
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Key words:
- graphene oxide /
- static fluorescence quenching /
- transient absorption /
- dynamic decay
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图 1 时间分辨光谱探测系统结构示意图
Figure 1. Schematic diagram of time-resolved spectroscopy probe system
图 2 加入不同浓度Fe3+的GO的稳态吸收光谱
Figure 2. Steady-state absorption spectra of GO with different Fe3+ concentrations
图 3 加入不同浓度Fe3+的GO的荧光发射光谱
Figure 3. Steady-state emission spectra of GO with different Fe3+ concentrations
图 4 加入不同浓度Fe3+的GO的时间分辨发射光谱
Figure 4. $Time-resolved emission spectra of GO with different Fe3+ concentrations
图 5 加入不同浓度Fe3+的GO在400 nm激发下的瞬态吸收光谱
Figure 5. Transient absorption spectra of GO with different Fe3+ concentrations at 400 nm excitation
图 6 加入不同浓度Fe3+的GO在530 nm激发下的瞬态吸收光谱
Figure 6. Transient absorption spectra of GO with different Fe3+ concentrations at 530 nm excitation
图 7 400 nm激发下加入不同浓度Fe3+的GO测量的动力学衰减曲线
Figure 7. Dynamic decay curves of GO with different Fe3+ concentrations at 400 nm excitation
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