Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Biological Synthesis of Size-Controlled Cadmium Sulfide Nanoparticles Using Immobilized Rhodobacter sphaeroides | Nanoscale Res Lett 2009 4 717-723 DOI S11671-009-9303-0 NANO EXPRESS Biological Synthesis of Size-Controlled Cadmium Sulfide Nanoparticles Using Immobilized Rhodobacter sphaeroides Hongjuan Bai Zhaoming Zhang Yu Guo Wanli Jia Received 30 December 2008 Accepted 24 March 2009 Published online 18 April 2009 to the authors 2009 Abstract Size-controlled cadmium sulfide nanoparticles were successfully synthesized by immobilized Rhodobacter sphaeroides in the study. The dynamic process that Cd2 was transported from solution into cell by living R. sph-aeroides was characterized by transmission electron microscopy TEM . Culture time as an important physiological parameter for R. sphaeroides growth could significantly control the size of cadmium sulfide nanoparticles. TEM demonstrated that the average sizes of spherical cadmium sulfide nanoparticles were and nm at culture times of 36 42 and 48 h respectively. Also the UV-vis and photoluminescence spectral analysis of cadmium sulfide nanoparticles were performed. Keywords Biosynthesis Cadmium sulfide Nanoparticles Rhodobacter sphaeroides Introduction Biosynthesis of nanomaterials as a novel nanoparticle synthesizing technology attracts increasing attention. It is well known that many organisms can provide inorganic materials either intra- or extracellularly 1 2 . For example unicellular organisms such as magnetotactic bacteria produce magnetite nanoparticles 3 and diatoms synthesize H. Bai H Y. Guo W. Jia Chemical Industry and Ecology Institute North University of China Taiyuan 030051 China e-mail bhj44871@ Z. Zhang College of Life Science and Technology Shanxi University Taiyuan 030006 China siliceous materials 4 . Even live plants such as Alfalfa are able to produce gold clusters surrounded by a shell of organic ligands 5 . Bansal et al. 6 have synthesized 4-5 nm barium titanate BT nanoparticles using a fungus-mediated approach. As far as the biosynthesis of cadmium sulfide CdS .
