Soft-Chemical Approach of Noble Metal Nanowires Templated from Mesoporous Silica (SBA-15) through Vapor Infiltration of a Reducing Agent
Soft-Chemical Approach of Noble Metal Nanowires Templated from Mesoporous Silica (SBA-15) through Vapor Infiltration of a Reducing Agent
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DOI：
10.1021/jp910288x
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发表时间：
2010-04
影响因子：
3.7
通讯作者：
Azusa Takai;Y. Doi;Y. Yamauchi;K. Kuroda
中科院分区：
文献类型：
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作者：
Azusa Takai;Y. Doi;Y. Yamauchi;K. Kuroda
以介孔SiO2（SBA-15）为模板，在相同的还原条件下，通过气相渗透法制备了贵金属（Pt，Ag，Au）纳米线。由于SBA-15具有连接介孔的微孔，因此Pt纳米线被连接并周期性地堆积，反映了原始介孔二氧化硅中的微孔和介孔排列。另一方面，其他金属（Ag和Au）纳米线主要是不连接的。这种差异归因于Ag和Au的沉积速率比Pt相对更快。因此，Ag和Au倾向于沿着中通道快速生长，并且微孔中的金属沉积不足以发生。金属纳米线的长度由还原时间控制。作为一个典型的情况下，表面等离子体共振光谱的Au纳米线嵌入SBA-15的变化取决于纳米线的长度。本还原是一种软化学、直接和通用的方法，对于大量合成金属纳米线具有优势。
Noble metal (Pt, Ag, and Au) nanowires are synthesized by using mesoporous silica (SBA-15) powders as templates through vapor infiltration of a reducing agent (dimethylamine borane, DMAB) under the same reduction conditions. Because SBA-15 has micropores connecting mesochannels, Pt nanowires are connected and periodically packed, reflecting the micropores and the mesochannel arrangements in the original mesoporous silica. On the other hand, other metal (Ag and Au) nanowires are mainly unconnected. Such a difference is attributed to the relatively faster deposition rate of Ag and Au than Pt. Therefore, Ag and Au tend to grow rapidly along the mesochannels, and the metal deposition in micropores is insufficient to occur. The length of the metal nanowires is controlled by the reduction time. As a typical case, the surface plasmon resonance spectra of the Au nanowires embedded in SBA-15 change depending on the length of the nanowires. The present reduction is a soft-chemical, straightforward, and general approach, which has advantages for the synthesis of metal nanowires in large amounts.