Wires, plates, flowers, needles, and core-shells: Diverse nanostructures of gold using polyaniline templates
Wires, plates, flowers, needles, and core-shells: Diverse nanostructures of gold using polyaniline templates
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DOI：
10.1021/la703593c
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发表时间：
2008-05-06
期刊：
影响因子：
3.9
通讯作者：
Pradeep, T.
中科院分区：
文献类型：
--
作者：
Sajanlal, P. R.;Sreeprasad, T. S.;Pradeep, T.
一种简单而通用的方法，用于合成范围广泛的聚苯胺（PANI）为基础的1D和2D金纳米结构的均匀尺寸分布与高胶体稳定性的证明。所有的纳米结构是由苯胺低聚物包覆的金纳米粒子前体合成的。纳米结构包括各种尺寸的纳米线、纳米片和花状纳米颗粒。这些纳米线表现出pH依赖的形状转变。当纳米线溶液的pH变为2.5时，形成了Au/PANI的针状聚集体。在较高的pH值（10.2），纳米线转化为球形纳米粒子。通过将纳米线的pH从10.2反转到2.9，已经实现了Au/PANI复合物的核-壳颗粒。用TEM和SEM研究了纳米结构的形貌。利用FTIR、UV-vis、XRD和LDI-MS对纳米结构的化学组成进行表征。提出了纳米线生长的机理。
A simple and versatile method for the synthesis of a wide range of polyaniline (PANI)-based 1D and 2D gold nanostructures of uniform size distribution with high colloidal stability is demonstrated. All the nanostructures were synthesized from oligoaniline-coated gold nanoparticle precursors. The nanostructures include nanowires of various sizes, nanoplates, and flower-like nanoparticles. These nanowires showed a pH-dependent shape transformation. Needle-like aggregates of Au/PANI were formed as the pH of the nanowire solution changed to 2.5. At higher pH (10.2), nanowires converted into spherical nanoparticles. Core-shell particles of Au/PANI composites have been achieved by the reversal of the pH of the nanowire from 10.2 to 2.9. The morphology of the nanostructures was studied by TEM and SEM. FTIR, UV-vis, XRD, and LDI MS were utilized for the characterization of the chemical composition of the nanostructures. A mechanism for the nanowire growth is proposed.