On the formation of protected gold nanoparticles from AuCl4− by the reduction using aromatic amines
On the formation of protected gold nanoparticles from AuCl4− by the reduction using aromatic amines
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DOI：
10.1007/s11051-005-0315-0
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发表时间：
2005-06
影响因子：
2.5
通讯作者：
C. Subramaniam;Renjis T. Tom;T. Pradeep
中科院分区：
文献类型：
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作者：
C. Subramaniam;Renjis T. Tom;T. Pradeep
胺由于其对氮的亲和力而被广泛用作金属纳米颗粒（特别是金）合成中的还原剂和随后的封端剂。以2-甲基苯胺为例，我们表明，金属还原后的胺的聚合，而它的一部分覆盖在纳米粒子表面的另一部分沉积在溶液中。研究发现，胺的氧化聚合与金纳米粒子的形成是同步的。由此形成的金纳米颗粒具有20 nm的平均直径。聚合胺包封金纳米颗粒，形成约5 nm厚的坚固壳，使金核对与裸露的金纳米颗粒反应的矿化剂如氯仿、溴仿、氰化钠、苄基氯等呈惰性。沉积的聚合物在很大程度上被质子化，在其形成过程中从介质中吸收质子。在苯胺的情况下也观察到类似的结果。这些材料已经通过光谱学和显微镜进行了充分的表征。
Amines are used extensively as reductants and subsequent capping agents in the synthesis of metal nanoparticles, especially gold, due to its affinity to nitrogen. Taking 2-methyl aniline as an example, we show that metal reduction is followed by polymerization of the amine, while part of it covers the nanoparticle surface another fraction deposits in the solution. It is found that the oxidative polymerization of the amine goes in step with the formation of gold nanoparticles. The gold nanoparticles thus formed have a mean diameter of 20 nm. The polymerized amine encapsulates the gold nanoparticle forming a robust shell of about 5 nm thickness, making the gold core inert towards mineralizing agents such as chloroform, bromoform, sodium cyanide, benzylchloride, etc. which react with the naked gold nanoparticles. The deposited polymer is largely protonated, taking up protons from the medium during its formation. Similar results have been observed in the case of aniline also. The materials have been fully characterized by spectroscopy and microscopy.