Observation of Excited State Proton Transfer between the Titania Surface and Dye Molecule by Time-Resolved Fluorescence Spectroscopy,The Journal of Physical Chemistry C

当前位置： X-MOL 学术 › J. Phys. Chem. C › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Observation of Excited State Proton Transfer between the Titania Surface and Dye Molecule by Time-Resolved Fluorescence Spectroscopy
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-30 , DOI: 10.1021/acs.jpcc.1c05843
Hiromasa Nishikiori _{1,

2} , Yosuke Kageshima _{1,

2} , Nasrin Hooshmand ₃ , Mostafa A. El-Sayed ₃ , Katsuya Teshima _{1,

2}

Affiliation

A temporal change in acidity on the titania surface during UV irradiation was indirectly monitored by evaluating the deposited fluorescein dye using surface plasmon resonance spectroscopy such that gold nanoparticles were embedded under the titania thin film in order to increase the sensitivity. The fluorescence signal mainly originated from the highly fluorescent dianion species of fluorescein in the fluorescence time profiles after the femtosecond laser excitation. The signal monotonously decayed with a single exponential function on silica, whereas the signal rose and decayed with a double exponential function on the titania. The present femtosecond time-resolved fluorescence study revealed that a process involving the transformation from the monoanion to dianion of fluorescein “in the excited states”, i.e., the excited state proton transfer from the dye molecule to the titania surface, induced the subsequent fluorescence process, which had not been detected by the previous transient absorption or nanosecond fluorescence measurements.

中文翻译：

通过时间分辨荧光光谱观察二氧化钛表面和染料分子之间的激发态质子转移

通过使用表面等离子体共振光谱评估沉积的荧光素染料，间接监测紫外线照射期间二氧化钛表面酸度的时间变化，从而将金纳米颗粒嵌入二氧化钛薄膜下以提高灵敏度。荧光信号主要来自飞秒激光激发后荧光时间曲线中的高荧光二价荧光素种类。信号在二氧化硅上以单指数函数单调衰减，而在二氧化钛上以双指数函数上升和衰减。目前的飞秒时间分辨荧光研究揭示了一个涉及“处于激发态”的荧光素从单阴离子向双阴离子转变的过程，即，

更新日期：2021-10-14

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南