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Microbial synthesis of semiconductor CdS nanoparticles, their characterization, and their use in the fabrication of an ideal diode
Author(s) -
Kowshik Meenal,
Deshmukh Neelima,
Vogel W.,
Urban J.,
Kulkarni S. K.,
Paknikar K. M.
Publication year - 2002
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.10233
Subject(s) - wurtzite crystal structure , cadmium sulfide , nanoparticle , materials science , fabrication , absorbance , diode , semiconductor , optoelectronics , nanotechnology , chemical engineering , chemistry , zinc , chromatography , medicine , alternative medicine , pathology , engineering , metallurgy
Cadmium sulfide nanoparticles were synthesized intracellularly by a Schizosaccharomyces pombe strain when challenged with 1 m M cadmium in solution. The nanoparticles, a known semiconducting material, exhibited an absorbance maximum at 305 nm. X‐ray scattering data showed that the nanoparticles had a Wurtzite (Cd 16 S 20 )‐type hexagonal lattice structure and most of the nanoparicles were in the size range of 1–1.5 nm. The nanoparticles were used in the fabrication of a heterojunction with poly ( p ‐phenylenevinylene). The diode exhibited ∼75 mA/cm 2 current at 10 V when forward biased and the breakdown occurred at ∼15 V in the reverse biased mode. These characteristics are considered ideal for a diode. © 2002 Wiley Periodicals, Inc. Biotechnol Bioeng 78: 583–588, 2002.