A facile method for gold decoration of Te@CdTe nanorods in aqueous solution

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• 作者：Haibao Shao ; Chunlei Wang ; Zhuyuan Wang ; Rongqing Li ; Qinying Xu ; Shuhong Xu ; Yuan Jiang ; Qingfeng Sun ; Fan Bo ; Yiping Cui
• 关键词：Hybrid nanostructures ; Te@CdTe nanorods ; Au decoration
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：1 October, 2012
• 年：2012
• 卷：383
• 期：1
• 页码：43-48
• 全文大小：1107 K

文摘

Colloidal synthesis of metal-semiconductor hybrid nanostructures is mainly achieved in organic solution. In some applications of hybrid nanoparticles relevant in aqueous media, phase transfer of hydrophobic metal-semiconductor hybrid nanostructures is essential. In this work, we present a simple method for direct synthesis of water-soluble gold (Au) decorated Te@CdTe hybrid nanorods (NRs) at room temperature by using aqueous Te@CdTe NRs as templates, which were preformed by using CdTe nanocrystals (NCs) as precursor in the presence of hydrazine hydrate (N₂H₄). Our results showed that NRs were decorated with Au islands both on tips and along the surface of the NRs. The size and density of Au islands can be controlled by varying the amount of Au precursor (mixture of HAuCl₄ and thioglycolic acid (TGA)) and TGA/HAuCl₄ ratio. A possible growth mechanism for the Au decoration of Te@CdTe NRs is concluded as three steps: (1) the formation of AuTe_1.7 via the substitution reaction of Cd²⁺ by Au³⁺, (2) adsorption of Au-TGA complex onto the preformed AuTe_1.7 anchors and following reduction by CdTe and N₂H₄, leading to the formation of small Au NCs, (3) Au NCs grow to bigger ones, followed by reduction of more Au precursor by N₂H₄.