Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 169, Issue -, Pages 199-207Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.04.067
Keywords
Nanocomposite; SnO2:CuO; Fiber-optic sensor; Ethanol sensor; Oxygen adsorption
Funding
- Department of Science and Technology, Government of India
- University Grants Commission
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Ethanol sensitivities of SnO2 and SnO2:CuO nanoparticles are studied using a clad-modified fiber-optic sensor. The sensing materials (SnO2 and SnO2:CuO) are structurally characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) and their crystallite sizes are found to be 10 and 8-20 mn, respectively. The refractive indices of the sensing materials (n(SiO2) = 2.438 and n(SnO2:CuO) = 2.527) found from UV-vis analysis show that the fiber-optic sensor works under leaky mode operation. SnO2:CuO exhibits higher ethanol sensitivity compared to pure SnO2. It is found that the addition of CuO into SnO2 allows the effective formation of more number of oxygen vacancies, heterojunction, and high crystalline nanoparticles, which enhance its sensitivity to about three times than that of pure SnO2. (C) 2012 Elsevier B.V. All rights reserved.
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