Microbial induced synthesis of hollow cylinder and helical NiO micro/nanostructure
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esearch Letters
Microbial induced synthesis of hollow cylinder and helical NiO micro/nanostructure Shashi B. Atla, Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi 621, Taiwan Chien-Yen Chen, Department of Earth and Environmental Sciences and Advanced Institute of Manufacturing with High-tech Innovations, National Chung Cheng University, Minhsiung, Chiayi 621, Taiwan Ching-Wen Fu and Ting-Che Chien, Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi 621, Taiwan An-Cheng Sun and Chuan-Fa Huang, Department of Chemical Engineering and Materials Science, Yuan Ze University, No. 135 Yuan-Tung Road, Chungli, Taoyuan 320, Taiwan Chien-Jung Lo, Department of Physics, National Central University, No. 300, Jhongda Road, Jhongli City, Taoyuan County 320, Taiwan Tsui-Chu Yang, Department of Hotel and Restaurant Management, Chia-Nan University of Pharmacy and Science, No. 60, Sec. 1, Erren Road, Rende Dist., Tainan City 717, Taiwan Address all correspondence to Chien-Yen Chen at [email protected]; [email protected] (Received 18 June 2014; accepted 5 September 2014)
Abstract Bacillus pasteurii was used as synthesis director for the formation of hollow cylinder and helical NiO micro/nanostructure under urea hydrolysis conditions. Bacteria were capable of precipitating nickel product from nickel solution by metabolic processes. An appropriate amount of both water and bacterial solution were required to precipitate the nickel product in good yield. The average crystallite size of NiO was 11.45 nm and lengths of the cylinder and helices were non-uniform (∼2–7 µm) and were varied with bacterial body structure template. The present study demonstrates a feasibility of synthesizing bacteria-guided metal oxide crystals for various functional applications.
Introduction Microbial synthesis of nanoparticles has emerged as a promising field of research known as a branch of Nanobiotechnology that interconnects biotechnology and nanotechnology.[1] The biological synthesis approaches for nanoparticles are safe, cost-effective, and furthermore it is eco-friendly as compared to the typical chemical processes that demand stringent conditions and often involve toxic chemicals. Many microorganisms produce a variety of inorganic materials either intra- or extracellularly. For example, Konishi et al.[2] reported that Shewanella algae reduced gold ions on bacterial surfaces at pH 2.8 extracellularly. Prasad et al.[3] demonstrated lactobacillus-assisted synthesis of Titanium spherical nanoparticles having a size of 40–60 nm. Mao et al.[4] used the virus-based scaffold for the synthesis of semiconducting (singlecrystal ZnS and CdS) and magnetic (CoPt and FePt) nanowires. Considerable amount of research on microbial carbonate precipitation (MCP) has been done using urealytic bacteria.[5,6] Most commonly studied system for MCP is the urea hydrolysis via the enzyme urease in a calcium-rich environment. This enzyme catalyzes the hydrolysis of urea to
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