Document Detail


Vanadium oxide nanoparticles as optical sensors of cysteine.
MedLine Citation:
PMID:  21770095     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
We report on the synthesis of vanadium oxide nanoparticles using the laser ablation in solution technique. The particles were characterized by dynamic light scattering-DLS, transmission electron microscopy-TEM, X-ray diffraction-XRD, X-ray photoelectron spectroscopy-XPS and UV-Vis optical spectroscopy. The oxide nanoparticles are mainly composed of tetragonal V2O5, a semiconductor with a 2.2 eV band gap. The interaction of the nanoparticles with cysteine, a very important aminoacid present in proteins, was studied. Upon reaction with cysteine, the bandgap of the nanoparticles shifts to the ultraviolet region at 2.87 eV. This color change from yellow to transparent can be used for selective cysteine sensing. Additionally, the intervalence band of the optical absorption spectra shows capability for cysteine sensing in the microM range.
Authors:
W Celestino-Santos; A G Júnior Bezerra; A B Cezar; N Mattoso; W H Schreiner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of nanoscience and nanotechnology     Volume:  11     ISSN:  1533-4880     ISO Abbreviation:  J Nanosci Nanotechnol     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-07-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088195     Medline TA:  J Nanosci Nanotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4702-7     Citation Subset:  IM    
Affiliation:
Departamento de Física, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, 81531-880 Curitiba, Paraná, Brazil.
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