Abstract:
:We report microbially facilitated synthesis of cadmium sulfide (CdS) nanostructured particles (NP) using anaerobic, metal-reducing Thermoanaerobacter sp. The extracellular CdS crystallites were <10 nm in size with yields of ~3 g/L of growth medium/month with demonstrated reproducibility and scalability up to 24 L. During synthesis, Thermoanaerobacter cultures reduced thiosulfate and sulfite salts to H₂S, which reacted with Cd²⁺ cations to produce thermodynamically favored NP in a single step at 65 °C with catalytic nucleation on the cell surfaces. Photoluminescence (PL) analysis of dry CdS NP revealed an exciton-dominated PL peak at 440 nm, having a narrow full width at half maximum of 10 nm. A PL spectrum of CdS NP produced by dissimilatory sulfur reducing bacteria was dominated by features associated with radiative exciton relaxation at the surface. High reproducibility of CdS NP PL features important for scale-up conditions was confirmed from test tubes to 24 L batches at a small fraction of the manufacturing cost associated with conventional inorganic NP production processes.
journal_name
J Ind Microbiol Biotechnoljournal_title
Journal of industrial microbiology & biotechnologyauthors
Moon JW,Ivanov IN,Duty CE,Love LJ,Rondinone AJ,Wang W,Li YL,Madden AS,Mosher JJ,Hu MZ,Suresh AK,Rawn CJ,Jung H,Lauf RJ,Phelps TJdoi
10.1007/s10295-013-1321-3subject
Has Abstractpub_date
2013-11-01 00:00:00pages
1263-71issue
11eissn
1367-5435issn
1476-5535journal_volume
40pub_type
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