Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process

doi:10.1007/s11458-009-0022-y

Front Chem Chin

2009, Vol. 4

Issue (2) : 154-159 https://doi.org/10.1007/s11458-009-0022-y

RESEARCH ARTICLE

Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process

Huaping ZHU, Hao LI, Huiyu SONG, Shijun LIAO(

)

School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China

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Abstract

Nano-sized cobalt particles with the diameter of 2 nm were prepared via an organic colloidal process with sodium formate, ethylene glycol and sodium citrate as the reducing agent, the solvent and the complexing agent, respectively. The effects of sodium citrate on the yield, crystal structure, particle size and size distribution of the prepared nano-sized cobalt particles were then investigated. The results show that the average particle diameter decreases from 200 nm to 2 nm when the molar ratio of sodium citrate to cobalt chloride changes from 0 to 6. Furthermore, sodium citrate plays a crucial role in the controlling of size distribution of the nano-sized particles. The size distribution of the particle without sodium citrate addition is in range from tens of nanometers to 300 or 400 nm, while that with sodium citrate addition is limited in the range of (2±0.25) nm. Moreover, it is found that the addition of sodium citrate as a complex agent could decrease the yield of the nano-sized cobalt particle.

Keywords sodium citrate cobalt organic colloidal process nano-sized material complexation

Corresponding Author(s): LIAO Shijun,Email:chsjliao@scut.edu.cn

Issue Date: 05 June 2009

Cite this article:

Huaping ZHU,Hao LI,Huiyu SONG, et al. Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process[J]. Front Chem Chin, 2009, 4(2): 154-159.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0022-y
https://academic.hep.com.cn/fcc/EN/Y2009/V4/I2/154

Fig.1 TEM images of cobalt nanoparticles prepared in different molar ratios of sodium citrate to cobalt chloride

Fig.2 Size distribution of cobalt nanoparticles prepared in different molar ratio of sodium citrate to cobalt chloride

Tab.1 The yields of cobalt nanoparticle prepared in different molar ratio of sodium citrate to cobalt chloride

Fig.3 Effect of reaction time on the yields of Co nanoparticles

Fig.4 XRD patterns of the cobalt nanoparticles

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