Vanadium Oxide Nanoparticles as Optical Sensors of Cysteine

被引：15

作者：

Celestino-Santos, W. ^{[1
]}

Bezerra, A. G., Jr. ^{[2
]}

Cezar, A. B. ^{[1
]}

Mattoso, N. ^{[1
]}

Schreiner, W. H. ^{[1
]}

机构：

[1] Univ Fed Parana, Dept Fis, Ctr Politecn, BR-81531880 Curitiba, Parana, Brazil

[2] Univ Tecnol Fed Parana, Dept Acad Fis, BR-80230010 Curitiba, Parana, Brazil

来源：

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2011年 / 11卷 / 06期

关键词：

Vanadium Oxide; Nanoparticles; Cysteine; Sensor; VIBRONIC COUPLING MODEL;

D O I：

10.1166/jnn.2011.4194

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 mu M range.

引用

页码：4702 / 4707

页数：6

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