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| Research on High Efficient Separation of Gold Nanotriangles Based on Centrifuge accelerated Depletion Effect |
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| DOI： |
| KeyWord:depletion effect centrifugation gold nanoparticles gold nanotriangles self assembly flocculation precipitation |
| Author | Institution |
| LU Shuang，WANG Li-hua，LIU Hua-jie，FAN Chun-hai |
1.Shanghai Institute of Applied Physics,Chinese Academy of Sciences;2.University of Chinese Academy of Sciences;3.Shanghai Advanced Research Institute,Chinese Academy of Sciences;4.School of Chemical Science and Engineering,Tongji University;5.School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University |
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| Abstract: |
| Hindered by the difficulties in preparation and purification,it is always a challenge to obtain the gold nanotriangles(AuNTs) products with purer and better morphology.In this paper,a method was systematically proposed for the rapid fabrication of triangular gold nanoparticles with various sizes,single morphology and less rounded corners by centrifuge accelerated depletion effect using cetyltrimethylammonium chloride(CTAC) as flocculant.The optimum concentrations of flocculant for different sizes of gold nanotriangles were found by using UV-Vis spectrophotometer to compare the colors and the extinction spectra of supernatant and redispersed precipitate colloids obtained with different concentrations of flocculant.By comparing the morphology variations of the nanoparticles before and after purification with transmission electron microscope(TEM),the limitations for the existing purification method through natural precipitation overnight were found,which took a long time and had a significant impact on the morphology of the particles.Results showed that the method could not only achieve a rapid and efficient purification toward the gold triangular nanoparticles with different sizes,but also effectively reduce the tip loss of nanoparticles in the purification process.Especially for the triangular nanoparticles with small sizes containing side length less than 50 nm,the tips of particles purified by centrifuge accelerated depletion induced coagulation could still maintain their sharpness.This method is simple and efficient for the separation of triangular gold nanoparticles.And it is expected to be extended to the purification of nanoparticles of other components,non spherical and low symmetry shapes. |
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