猝灭(荧光)
电子转移
量子点
激发态
细胞色素c
光化学
超快激光光谱学
电子
化学
吸收(声学)
分析化学(期刊)
光谱学
原子物理学
分子物理学
材料科学
荧光
物理
光电子学
光学
线粒体
色谱法
量子力学
复合材料
生物化学
作者
Jakub Sławski,Sebastian Szewczyk,Gotard Burdziński,Krzysztof Gibasiewicz,Joanna Grzyb
标识
DOI:10.1016/j.saa.2023.122627
摘要
We applied transient absorption spectroscopy to study the early photodynamics in a system composed of CdTe quantum dots (QDs) and cytochrome c (Cyt c) protein. In the QDs and Cyt c mixtures, about 25 % of the excited QD electrons quickly relax (∼23 ps) to the ground state and roughly 75 % decay on slower time scale - mostly due to quenching by Cyt c. On the basis of the assumed model, we estimated the contribution of electron transfer and other mechanisms to this quenching. The primary quenching mechanism is probably energy transfer but electron transfer makes a significant contribution (∼8 %), resulting in photoreduction of Cyt c. The lifetime of one fraction of reduced Cyt c (35-90 %) is ∼ 1 ms and the lifetime of the remaining fraction was longer than the ∼ 50-ms time window of the experiment. We speculate that, in the former fraction, the back electron transfer from the reduced Cyt c to QDs occurs and the latter fraction of Cyt c is stably reduced.
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