Bacterial biosynthesis of cadmium sulfide nanocrystals.
Semiconductor nanocrystals, which have unique optical and electronic properties, have potential for applications in the emerging field of nanoelectronics. To produce nanocrystals cheaply and efficiently, biological methods of synthesis are being explored. We found that E. coli, when incubated with cadmium chloride and sodium sulfide, have the capacity to synthesize intracellular cadmium sulfide (CdS) nanocrystals. The nanocrystals are composed of a wurtzite crystal phase with a size distribution of 2-5 nm. Nanocrystal biosynthesis increased about 20-fold in E. coli cells grown to stationary phase compared to late logarithmic phase. Our results highlight how different genetic and physiological parameters can enhance the formation of nanocrystals within bacterial cells.
Sweeney
Rozamond Y
RY
Institute for Cellular and Molecular Biology, University of Texas, Austin, TX 78712, USA.
Mao
Chuanbin
C
Gao
Xiaoxia
X
Burt
Justin L
JL
Belcher
Angela M
AM
Georgiou
George
G
Iverson
Brent L
BL
D019187:Cadmium Compounds / Q000737:chemistry / Q000378:metabolism*; D003460:Crystallization; D004926:Escherichia coli / Q000737:chemistry / Q000378:metabolism*; D036103:Nanotechnology; D013440:Sulfides / Q000737:chemistry / Q000378:metabolism*
D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide