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Infrared and Raman spectra and scattering (condensed matter)

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Biomimetic synthesis and characterisation of ZnS nanoparticles in aqueous solution of lysozyme
Author(s): Li Zhang, Dezhi Qin, Qiaoru Liu, Guoxu He
Source: Micro & Nano Letters, Volume 7, Issue 2, 2012 , p. 115 - 117
Type: Article
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Zinc sulphide nanoparticles were prepared by a simple biomolecule-assisted biomimetic method at room temperature. X-ray diffraction pattern confirmed the formation of a cubic zinc blende phase of ZnS nanocrystals. Transmission electron microscopy images revealed that the nanoparticles are nearly spherical in shape, with average diameter about 40 nm. The optical property of ZnS nanoparticles was studied by the ultraviolet–visible spectrum. Different template concentrations of lysozyme are used to investigate the influence of biomolecule on the formation of nanoparticles. Fourier transform infrared spectroscopy study suggested ZnS nanoparticles can react with functional groups of lysozyme including –OH and –NH.

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One-pot strategy for biomimetic synthesis of zein-conjugated silver sulphide nanospheres in ethanol solution
Author(s): Li Zhang, Xian Du, Guangrui Yang, Qiuxia Zhang, Dezhi Qin
Source:
Type: Article
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Water-soluble Ag2S nanospheres embedded in a zein matrix were successfully synthesised by a simple, controllable protein-assisted method in ethanol solutions. The morphology and size of products were tunable through controlling the concentration of zein. X-ray diffraction and energy-dispersive X-ray spectrum results showed that the obtained samples were a pure monoclinic phase of Ag2S. The Ag2S nanoparticles were homogeneously surrounded by protein molecules observed from a high-resolution transmission microscopy image. There was strong chemical interaction between the Ag2S nanocrystals and the functional groups of zein molecules, which has been confirmed by Fourier transform infrared and thermogravimetry analysis measurements. The band gap of zein-conjugated Ag2S nanocrystals showed obvious blue shift in ultraviolet-visible spectra compared with bulk materials because of the quantum size effect.

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