title: Interface-mediated synthesis of monodisperse ZnS nanoparticles with sulfate-reducing bacterium culture.
abstract: We have created a new method of ZnS nanospheres synthesis. By interface-mediated precipitation method (IMPM), monodisperse ZnS nanoparticles was synthesized on the particle surface of sulfate-reducing bacterium nutritious agar culture. Sulfate-reducing bacterium (SRB) was used as a sulfide producer because of its dissimilatory sulfate reduction capability, meanwhile produced a variety of amino acids acting as templates for nanomaterials synthesis. Then zinc acetate was dispersed into nutritious agar plate. Subsequently agar plate was broken into particles bearing much external surface, which successfully mediated the synthesis of monodisperse ZnS nanoparticles. The morphology of monodisperse ZnS nanospheres and SRB were examined by scanning electron microscopy (SEM), and the microstructure was investigated by X-ray diffraction (XRD). The thermostability of ZnS nanoparticles was determined by thermo gravimetric-differential thermo gravimetric (TG-DTG). The maximum absorption wavelengh was analysed with an ultraviolet-visible spectrophotometer within a range of 199-700 nm. As a result, monodisperse ZnS nanoparticles were successfully synthesized, with an average diameter of 80 nm. Maximum absorption wavelengh was 228 nm, and heat decomposed temperature of monodisperse ZnS nanoparticles was 596°C.
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.  zhgl@djtu.edu.cn
authors: Zhanguo
authors: Z
authors: Liang
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China. Electronic address: mujun@djtu.edu.cn.
authors: Jun
authors: J
authors: Mu
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors: Ying
authors: Y
authors: Mu
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors: Jiaming
authors: J
authors: Shi
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors: Wenjing
authors: W
authors: Hao
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors: Xuewei
authors: X
authors: Dong
authors: College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors: Hongquan
authors: H
authors: Yu
mesh_terms: D001419:Bacteria / Q000378:metabolism* / Q000648:ultrastructure; D018360:Crystallography, X-Ray; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D055620:Optical Phenomena; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D013431:Sulfates / Q000378:metabolism*; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D013818:Thermogravimetry; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D013431:Sulfates; D013440:Sulfides; D017967:Zinc Compounds; C031238:zinc sulfide
keywords: ZnS nanoparticle; interface-mediated synthesis; sulfate-reducing bacterium