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首页> 外文期刊>Nanotechnology >Evolution of the optical spectra of an Ag/mesoporous SiO2 nanostructure heat-treated in air and H-2 atmospheres
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Evolution of the optical spectra of an Ag/mesoporous SiO2 nanostructure heat-treated in air and H-2 atmospheres

机译：在空气和H-2气氛中热处理的Ag /介孔SiO2纳米结构的光谱演化

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摘要

Evolution of the various optical spectra of Ag nanoparticles dispersed in mesoporous SiO2 after heating alternately in H-2 and air atmospheres has been investigated. It has been observed that, in accordance with alternate heat treatment in H-2 and air, surface plasmon resonance (SPR) absorption of the Ag/mesoporous SiO2 nanostructure alternately appeared and disappeared and its Raman scattering spectra reversibly increased and decreased. In contrast, its photoluminescence (PL) spectra alternately disappeared and appeared, whereas the infrared (IR) spectra did not change. Such novel optical sensitivities of silver nanoparticles are discussed on the basis of the changes in chemical states of silver induced by the interaction of silver nanoparticles with the atmospheres and the hosting medium. It is suggested that the chemical state of silver in mesoporous SiO2 changes reversibly between Ag and the Ag+ ion by the redox process.
机译：研究了在H-2和空气中交替加热后，分散在中孔SiO2中的Ag纳米粒子的各种光谱的演变。已经观察到，根据在H-2和空气中的交替热处理，Ag /介孔SiO 2纳米结构的表面等离子体共振（SPR）吸收交替出现和消失，并且其拉曼散射光谱可逆地增加和减少。相反，其光致发光（PL）光谱交替消失并出现，而红外（IR）光谱不变。在银纳米颗粒与大气和宿主介质相互作用引起的银化学状态变化的基础上，讨论了银纳米颗粒的这种新颖的光学敏感性。建议通过氧化还原过程，银在中孔SiO2中的化学状态在Ag和Ag +离子之间可逆地变化。

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