Nguyen Thinh Luong The, Gascón Nicolás Alba, Edvinsson Tomas, Meng Jie, Zheng Kaibo, Abdellah Mohamed, Sá Jacinto
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 532, 751 20 Uppsala, Sweden.
Department of Materials Science and Engineering-Solid State Physics, Uppsala University, P.O. Box 35, 751 03 Uppsala, Sweden.
Nanomaterials (Basel). 2020 Jul 15;10(7):1378. doi: 10.3390/nano10071378.
Plasmonics nanoparticles gained prominence in the last decade in fields of photonics, solar energy conversion and catalysis. It has been shown that anchoring the plasmonics nanoparticles on semiconductors via a molecular linker reduces band bending and increases hot carriers' lifetime, which is essential for the development of efficient photovoltaic devices and photocatalytic systems. Aminobenzoic acid is a commonly used linker to connect the plasmonic metal to an oxide-based semiconductor. The coordination to the oxide was established to occur via the carboxylic functional group, however, it remains unclear what type of coordination that is established with the metal site. Herein, it is demonstrated that metal is covalently bonded to the linker via the amino group, as supported by Surface-Enhanced Resonant Raman and infrared spectroscopies. The covalent linkage increases significantly the amount of silver grafted, resulting in an improvement of the system catalytic proficiency in the 4-nitrophenol (4-NP) photoreduction.
在过去十年中，等离子体纳米粒子在光子学、太阳能转换和催化等领域备受关注。研究表明，通过分子连接体将等离子体纳米粒子锚定在半导体上可减少能带弯曲并延长热载流子的寿命，这对于高效光伏器件和光催化系统的发展至关重要。氨基苯甲酸是一种常用的连接体，用于将等离子体金属与氧化物基半导体相连。已确定其与氧化物的配位是通过羧基官能团发生的，然而，与金属位点形成的配位类型仍不清楚。在此，表面增强共振拉曼光谱和红外光谱表明，金属通过氨基与连接体共价键合。这种共价键合显著增加了银的接枝量，从而提高了系统在4-硝基苯酚（4-NP）光还原反应中的催化能力。
