Direct preparation and characterization of chainlike assemblies formed by small platinum nanoparticles

Guo Zhirui; Huang Lan; Zhang Yu; Wang Meng; Xu Lina; Gu Ning

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Direct preparation and characterization of chainlike assemblies formed by small platinum nanoparticles

Guo Zhirui 1 #,Huang Lan 1,Zhang Yu 2,Wang Meng 2,Xu Lina 2,Gu Ning 2

1.Department of Biological Science & Medical Engineering, Southeast University

2.Department of Biological Science & Medical Engineering- Southeast University

*Correspondence author

#Submitted by

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Funding: 国家自然科学基金（No.nos. 20573019, 60371027, 60171005 and 90406023）

Opened online:29 May 2006

Accepted by: none

Citation: Guo Zhirui,Huang Lan,Zhang Yu.Direct preparation and characterization of chainlike assemblies formed by small platinum nanoparticles[OL]. [29 May 2006] http://en.paper.edu.cn/en_releasepaper/content/6848

We herein report a direct approach to prepare chainlike nanostructures by the assembly of small platinum nanoparticles through a polyol process in the presence of aniline. During the reduction process of H2PtCl6 to Pt nanoparticles by ethylene glycol, aniline functioned as a stabilizer, which played a key role in the formation of the chainlike assemblies of Pt nanoparticles. Moreover, investigation shows the size of the chainlike assemblies of Pt nanoparticles can be tailored by changing the amount of aniline in solution. The morphology of the as-prepared Pt nanostructures was observed by the combination of transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM). Other characterization techniques including energy-dispersive X-ray spectroscopy (EDX), Powder X-ray diffraction (XRD) and UV-vis- near infrared region (NIR) absorption spectroscopy were also used to analyze these chainlike nanostructures. Furthermore, the corresponding I-V characteristics were studied with a semiconductor characterization system by bridging a single chainlike assembly on a gold microelectrode pair. The possible formation mechanism of these chainlike assemblies of Pt nanoparticles was also discussed. It is believed that these chainlike Pt nanostructures are valuable for fundamental research and the construction of nanodevices.

Keywords: platinum nanoparticles; chainlike; assembly; aniline.

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