Synthesis of Platinum Nanowires in Organic−Inorganic Mesoporous Silica Templates by Photoreduction: Formation Mechanism and Isolation
Synthesis of Platinum Nanowires in Organic−Inorganic Mesoporous Silica Templates by Photoreduction: Formation Mechanism and Isolation
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DOI：
10.1021/jp036617v
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发表时间：
2004
影响因子：
3.3
通讯作者：
Yuzuru Sakamoto;A. Fukuoka;Takanori Higuchi;N. Shimomura;and Shinji Inagaki;M. Ichikawa
中科院分区：
文献类型：
--
作者：
Yuzuru Sakamoto;A. Fukuoka;Takanori Higuchi;N. Shimomura;and Shinji Inagaki;M. Ichikawa
通过光还原法在有机-无机介孔二氧化硅HMM-1（通道直径3 nm）中合成了Pt纳米线，并研究了其形成机制和分离。在吸附水和甲醇的情况下，用 H2PtCl6 浸渍 HMM-1 48 小时的紫外线照射导致在一维通道中形成 Pt 纳米线（直径 3 nm，长度达 5 μm）。另一方面，H2PtCl6/HMM-1 在 443 K 下 H2 还原 2 小时会导致通道中形成 Pt 纳米颗粒（直径 3 nm）和短线。通过透射电子显微镜（TEM）、X射线吸收精细结构（XAFS）和粉末X射线衍射（XRD）研究了线材的形成机制，表明Pt离子在水/甲醇相中迁移并在Pt颗粒上催化还原以生长为线材。然而，在 H2 还原中，Pt 离子的还原速度快于迁移速度，从而导致纳米颗粒的形成。铂丝是...
Pt nanowires are synthesized in organic−inorganic mesoporous silica HMM-1 (channel diameter 3 nm) by photoreduction, and the formation mechanism and isolation of the wires have been studied. UV-irradiation of HMM-1 impregnated with H2PtCl6 for 48 h in the presence of adsorbed water and methanol leads to the formation of Pt nanowires (diameter 3 nm, length up to 5 μm) in the one-dimensional channels. On the other hand, H2-reduction of H2PtCl6/HMM-1 at 443 K for 2 h results in the formation of Pt nanoparticles (diameter 3 nm) and short wires in the channels. The formation mechanism of the wires has been studied by transmission electron microscopy (TEM), X-ray absorption fine structure (XAFS), and powder X-ray diffraction (XRD), and it is suggested that Pt ions migrate in the water/methanol phase and are catalytically reduced on Pt particles to grow to wires. In the H2-reduction, however, the reduction of Pt ions is faster than the migration, thus resulting in the formation of nanoparticles. The Pt wires are...