Synthesis of Gold Nanotadpoles by a Temperature-Reducing Seed Approach and the Dielectrophoretic Manipulation

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• 作者：Lan Huang ; Meng Wang ; Yu Zhang ; Zhirui Guo ; Jianfei Sun ; Ning Gu
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：November 8, 2007
• 年：2007
• 卷：111
• 期：44
• 页码：16154 - 16160
• 全文大小：492K
• 年卷期：v.111,no.44(November 8, 2007)
• ISSN：1932-7455

文摘

Tadpole-shaped gold nanoparticles are synthesized in high yield by a simple temperature-reducing seedingapproach, without additional capping agent or surfactant. The initial concentration of gold ions, the addedseed colloids, and the solution reaction temperature play critical roles. Examination of nanoparticles at differentstages of the reaction with transmission electron microscopy and UV-vis spectrophotometry reveal theformation of the special structure as a kind of aggregation-based growth, including spherical aggregation atthe boiling temperature and linear aggregation at the reduced temperature. The latter is further studied usinga theoretical model. Moreover, thanks to the asymmetric structure of gold nanotadpoles, three types of chainingof gold nanotadpoles are experimentally obtained in nonuniform alternating-current electric fields at differentfrequencies by dielectrophoresis, which are in qualitative agreement with the simulation results.