Photoinduced Charge Transfer and Trapping on Single Gold Metal Nanoparticles on TiO2,ACS Applied Materials & Interfaces

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Photoinduced Charge Transfer and Trapping on Single Gold Metal Nanoparticles on TiO2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-10-12 , DOI: 10.1021/acsami.1c13662
Monica Luna ₁ , Mariam Barawi ₂ , Sacha Gómez-Moñivas ₃ , Jaime Colchero ₄ , Micaela Rodríguez-Peña ₁ , Shanshan Yang ₅ , Xiao Zhao ₅ , Yi-Hsien Lu _{5,

6} , Ravi Chintala ₆ , Patricia Reñones ₂ , Virginia Altoe ₆ , Lidia Martínez ₇ , Yves Huttel ₇ , Seiji Kawasaki _{5,

6} , Alexander Weber-Bargioni ₆ , Victor A de la Peña ÓShea ₂ , Peidong Yang _{5,

8} , Paul D Ashby ₆ , Miquel Salmeron _{5,

9}

Affiliation

We present a study of the effect of gold nanoparticles (Au NPs) on TiO₂ on charge generation and trapping during illumination with photons of energy larger than the substrate band gap. We used a novel characterization technique, photoassisted Kelvin probe force microscopy, to study the process at the single Au NP level. We found that the photoinduced electron transfer from TiO₂ to the Au NP increases logarithmically with light intensity due to the combined contribution of electron–hole pair generation in the space charge region in the TiO₂–air interface and in the metal–semiconductor junction. Our measurements on single particles provide direct evidence for electron trapping that hinders electron–hole recombination, a key factor in the enhancement of photo(electro)catalytic activity.

中文翻译：

TiO2 上单个金金属纳米颗粒的光致电荷转移和俘获

我们研究了金纳米粒子 (Au NPs) 对 TiO _{2 的影响}，在使用能量大于衬底带隙的光子照射期间对电荷产生和捕获的影响。我们使用了一种新的表征技术，即光辅助开尔文探针力显微镜，来研究单个 Au NP 水平的过程。我们发现，选自TiO所述光诱导电子转移₂到的Au NP对数与光强度由于空间电荷区中在TiO电子-空穴对产生的组合贡献增加₂-空气界面和金属 - 半导体结。我们对单个粒子的测量为阻碍电子-空穴复合的电子俘获提供了直接证据，这是增强光（电）催化活性的关键因素。

更新日期：2021-10-27

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