1] Université de Toulon, BP 20132, F-83957 La Garde Cedex, France [2] CNRS, IM2NP (UMR 7334), BP 20132, F-83957 La Garde Cedex, France.
Osaka University, Joining & Welding Research Institute, Ibaraki, Osaka 5670047, Japan.
Sci Rep. 2014 Jun 10;4:5238. doi: 10.1038/srep05238.
We compare the Raman scattering properties of hybrid nanostructures consisting of Ag nanoparticles (NPs) in disordered and aligned arrangements on single-walled carbon nanotubes (SWCNTs) as a result of chemical and photoreduction methods. In the latter case, the unique structure of the very small Ag NP (from 4 to 7 nm) chains generated an extremely large mode at 969 cm(-1) that was assigned to the sulphate-silver interaction at the NP surface. Another strong mode was present at 1201 cm(-1) and was assigned to an IR-active mode of sodium dodecyl sulphate (SDS); this mode was observed because the symmetry changes altered the selection rules. We demonstrate that both the UV photoreduction of silver and the presence of SWCNTs are necessary to produce this very strong Raman scattering. The Raman modes of the SWCNTs are also significantly modified by the presence of Ag NP chains along the nanotubes.
我们比较了由银纳米粒子（NPs）在无序和排列在单壁碳纳米管（SWCNTs）上的混合纳米结构的拉曼散射性质，这是由于化学和光还原方法的结果。在后一种情况下，非常小的 Ag NP（4 到 7nm）链的独特结构产生了一个非常大的模式在 969cm(-1)处，被分配给 NP 表面的硫酸盐-银相互作用。另一个强模式出现在 1201cm(-1)处，被分配给十二烷基硫酸钠（SDS）的 IR 活性模式；之所以观察到这种模式，是因为对称性的改变改变了选择规则。我们证明，银的紫外光还原和 SWCNTs 的存在都是产生这种非常强的拉曼散射所必需的。SWCNTs 的拉曼模式也因 Ag NP 链沿着纳米管的存在而被显著改变。
