Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 117, Issue -, Pages 199-205Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2014.02.027
Keywords
CdS; Nanoparticles; Biosynthesis; Face-centered cubic
Funding
- National Natural Science Foundation of China [51178171, 51108166, 51039001]
- New Century Excellent Talents in University [NCET-10-0361]
- Hunan Provincial Natural Science Foundation of China [10JJ7005]
- Ministry of Education
Ask authors/readers for more resources
This study details a novel method for the extracellular microbial synthesis of cadmium sulfide (CdS) quantum dots (QDs) by the white rot fungus Phanerochaete chrysosporium. P. chrysosporium was incubated in a solution containing cadmium nitrate tetrahydrate, which became yellow from 12 h onwards, indicating the formation of CdS nanocrystals. The purified solution showed a maximum absorbance peak between 296 and 298 nm due to CdS particles in the quantum size regime. The fluorescence emission at 458 nm showed the blue fluorescence of the nanoparticles. X-ray analysis of the nanoparticles confirmed the production of CdS with a face-centered cubic (fcc) crystal structure. The average grain size of the nanoparticles was approximately 2.56 nm, as determined from the full width at half-maximum (FWHM) measurement of the most intense peak using Scherer's equation. Transmission electron microscopic analysis showed the nanoparticles to be of a uniform size with good crystallinity. The changes to the functional groups on the biomass surface were investigated through Fourier transform infrared spectroscopy. Furthermore, the secretion of cysteine and proteins was found to play an important role in the formation and stabilization of CdS QDs. In conclusion, our study outlines a chemical process for the molecular synthesis of CdS nanoparticles. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available