金纳米团簇所发射荧光的稳定性及其表面的光催化氧化还原  

Stability of Fluorescence Emission from Gold Nanoclusters and Photocatalytic Redox on Surface

作　　者：Johar Zeb 郭慧君 袁群惠 干为 Johar Zeb;Huijun Guo;Qunhui Yuan;Wei Gan(Shenzhen Key Laboratory of Flexible Printed Electronics Technology,School of Science,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;Shenzhen Key Laboratory of Flexible Printed Electronics Technology,School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)

机构地区：[1]哈尔滨工业大学(深圳)理学院,深圳市柔性印刷电子技术重点实验室,深圳518055 [2]哈尔滨工业大学(深圳)材料科学与工程学院,深圳市柔性印刷电子技术重点实验室,深圳518055

出　　处：《Chinese Journal of Chemical Physics》2024年第2期429-438,I0099,I0100,I0105,共13页化学物理学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.21973022);Guangdong Basic and Applied Basic Research Foundation(No.2023A1515012353).

摘　　要：金纳米团簇的荧光和光催化活性是其重要性质.本文合成了水溶性的卡托普利(Capt)和谷胱甘肽(GSH)覆盖的Au_(25)(Capt)_(18)和Au_(15)(GSH)_(13)纳米团簇,并研究了与其表面光氧化还原过程相关的荧光稳定性。发现Au_(25)(Capt)_(18)在氧气环境和近红外飞秒激光(810nm,300mW)照射下,出现了因表面氧化导致的双光子荧光效率衰减。而Au_(15)(GSH)_(13)的双光子荧光效率在相同的激发下保持稳定.两种金纳米团簇荧光稳定性不同的原因被归因于其不同的带隙,并使用光子能量高于两种金纳米团簇带隙的单光子激发证实了这一解释。通过添加不同试剂进行对比实验,对Au_(25)(Capt)_(18)表面金原子的光催化氧化还原活性进行了调控和理解.The fluorescent emission and the photocatalytic activity of gold nanoclusters(AuNCs)are important properties of AuNCs.Here,we synthesized water-soluble,captopril(Capt)and glutathione(GSH)covered Au_(25)(Capt)_(18) and Au_(15)(GSH)_(13) nanoclusters and investigated their fluorescence stabilities which are correlated with the photo-redox of their surface.It was observed that Au_(25)(Capt)_(18) exhibited a decay in its two-photon fluorescence emission induced by surface oxidation upon irradiation of femtosecond near-infrared laser(810 nm,300 mW)in the presence of oxygen(O_(2)).On the other hand,the two-photon fluorescence from Au_(15)(GSH)_(13) was stable upon the same excitation.The different stabilities of the fluorescence of the two AuNCs were attributed to their different band gaps.This interpretation was confirmed by one-photon excitation with photon energy beyond the band gaps of the two AuNCs.Using experiments with the addition of several agents,the photocatalytic redox activities of gold atoms on the surface of Au_(25)(Capt)_(18) were understood and tuned.

关 键 词：金纳米团簇 带隙 双光子荧光 光催化氧化还原 

分 类 号：O644.1[理学—物理化学]