Repeated appearance and disappearance of localized surface plasmon resonance in 1.2 nm gold clusters induced by adsorption and desorption of hydrogen atoms
Repeated appearance and disappearance of localized surface plasmon resonance in 1.2 nm gold clusters induced by adsorption and desorption of hydrogen atoms
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氢原子吸附和解吸引起的1.2 nm金簇中局域表面等离子体共振的重复出现和消失
DOI：
10.1039/c5nr06373f
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发表时间：
2016
期刊：
影响因子：
6.7
通讯作者：
T. Tsukuda
中科院分区：
文献类型：
--
作者：
R. Ishida;S. Yamazoe;K. Koyasu;T. Tsukuda
将NaBH 4水溶液加入到由聚（N-乙烯基-2-吡咯烷酮）（Au：PVP）稳定的小（约1.2 nm）金簇的分散体中，在一定时间内诱导局部表面等离子体共振（LSPR）吸收，同时保持簇的尺寸。增加NaBH 4浓度可使LSPR带的持续时间延长，增加溶解O2浓度可使LSPR带的持续时间缩短，并可使LSPR带反复出现。的LSPR带的外观解释的电子捐赠的Au核心从吸附的H原子，源自NaBH 4，而其消失归因于去除H原子通过它们与O2的反应。这些结果表明，与Au电子等效的H原子的吸附和脱附可以可逆地诱导Au团簇的金属和非金属电子结构之间的转变.
Addition of an aqueous solution of NaBH4 to a dispersion of small (∼1.2 nm) gold clusters stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP) induced a localized surface plasmon resonance (LSPR) absorption for a certain period of time while maintaining the cluster size. The duration of the LSPR band could be lengthened by increasing the NaBH4 concentration and shortened by increasing the concentration of dissolved O2, and the LSPR band could be made to appear and reappear repeatedly. The appearance of the LSPR band is explained by the electron donation to the Au core from the adsorbed H atoms that originate from NaBH4, whereas its disappearance is ascribed to the removal of H atoms by their reaction with O2. These results suggest that the transition between the metallic and non-metallic electronic structures of the Au clusters can be reversibly induced by the adsorption and desorption of H atoms, which are electronically equivalent to Au.