Tuning Metal Nanostructures in Mesoporous Silica by a Simple Change of Metal Complexes and by Reduction with Grafted Imines and Hemiaminals
Tuning Metal Nanostructures in Mesoporous Silica by a Simple Change of Metal Complexes and by Reduction with Grafted Imines and Hemiaminals
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DOI：
10.1021/jp801992d
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发表时间：
2008-06
影响因子：
3.7
通讯作者：
You-chang Xie;S. Quinlivan;Tewodros Asefa
中科院分区：
文献类型：
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作者：
You-chang Xie;S. Quinlivan;Tewodros Asefa
我们报道了不同负载的银（Ag）或金（Au）单分散纳米颗粒的合成方法，以及具有可调长宽比和光学性质的银和金纳米棒。这是在外部功能化的介孔SBA-15材料内部实现的，方法是通过改变金属配合物的类型，减少亚胺或半胺，这些亚胺或半胺固定在介孔材料的通道壁上。接枝的3-氨基丙基分别与CH3CHO或HCHO反应生成亚胺基和半胺基。以较低浓度的AgNO3水溶液或氨态[Ag(NH3)2]NO3溶液为金属源，形成Ag单分散纳米颗粒。有趣的是，当氨态[Ag(NH3)2]NO3溶液浓度增加时，只会产生负载更高的纳米颗粒，而不会形成纳米棒；而随着AgNO3水溶液浓度的增加，银纳米棒具有更高的纵横比和…
We report synthetic methods to produce silver (Ag) or gold (Au) monodisperse nanoparticles with different loadings as well as Ag and Au nanorods with tunable aspect ratios and optical properties. This is achieved inside externally functionalized mesoporous SBA-15 material by utilizing a simple change of the type of metal complex that is reduced with imines or hemiaminals that were anchored within the channel walls of the mesoporous material. The imine and hemiaminal groups were produced by reacting grafted 3-aminopropyl groups with CH3CHO or HCHO, respectively. Upon using lower concentrations of aqueous AgNO3 or ammonical [Ag(NH3)2]NO3 solution as the metal source, Ag monodisperse nanoparticles formed. Interestingly, when the concentration of ammonical [Ag(NH3)2]NO3 solution was increased, this resulted exclusively in nanoparticles with a higher loading and with no formation of nanorods; while increasing the concentration of aqueous AgNO3 solution resulted in silver nanorods with higher aspect ratios and ...