Tạp chí Đại học Thủ Dầu Một, S. 21 (2015)

Cỡ chữ:  Nhỏ  Vừa  Lớn

Tổng hợp hạt và thanh nano bạc bằng phương pháp thủy nhiệt

Phan Hà Nữ Diễm

Tóm tắt

Small silver nanospheres and nanobars have been prepared using hydrothermal process. Thermogenetic magnetic stirred machine treatment of the mixture of silver nitrate and sodium borohydride in the presence of trisodium citrate in aqueous. Results in the formation of poorly crystallized silver at ambient temperature. As a result, we were able to achieve a nucleation burst in the early stage to generate a large number of seeds and a relatively slow growth rate thereafter. Silver nanobars with rectangular side facets and an average aspect ratio of 3 have been synthesized by modifying feeding speed of reactants. Due to their anisotropy, Ag nanobars exhibit two plasmon resonance peaks. The microstructure of Ag nanospheres and nanobars was tested by XRD and TEM. The different growth process of Ag nanospheres and nanobars has been traced by UV – visible  absorption spectra. It is shown that the silver nanospheres and nanobars prepared of in aqueous solution through adequate reaction temperature, concentrations of AgNO3 and NaBH4 solutions, feeding speed of reactants… possess well compositional homogeneity and different morphologies.

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Tạp chí Đại học Thủ Dầu Một, ISSN: 1859-4433