title: Spectroscopic and fiber optic ethanol sensing properties Gd doped ZnO nanoparticles.
abstract: We report the structural, optical and gas sensing properties of prepared pure and Gd doped ZnO nanoparticles through solgel method at moderate temperature. Structural studies are carried out by X-ray diffraction method confirms hexagonal wurtzite structure and doping induced changes in lattice parameters is observed. Optical absorption spectral studies shows red shift in the absorption peak corresponds to band-gap from 3.42 eV to 3.05 eV and broad absorption in the visible range after Gd doping is observed. Scanning electron microscopic studies shows increase in particle size where the particle diameters increase from few nm to micrometers after Gd doping. The clad modified ethanol fiber-optic sensor studies for ethanol sensing exhibits best sensitivity for the 3% Gd doped ZnO nanoparticles and the sensitivity get lowered incase of higher percentage of Gd doped ZnO sample.
authors.affiliation: Ecole Nationale Supérieur de Mécanique et d'Aérotechnique, Chasseneuil-du-Poitou 86 360, France.
authors.forename: J L
authors.initials: JL
authors.lastname: Noel
authors.affiliation: Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
authors.forename: R
authors.initials: R
authors.lastname: Udayabhaskar
authors.affiliation: Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
authors.forename: B
authors.initials: B
authors.lastname: Renganathan
authors.affiliation: Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
authors.forename: S
authors.initials: S
authors.lastname: Muthu Mariappan
authors.affiliation: Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
authors.forename: D
authors.initials: D
authors.lastname: Sastikumar
authors.affiliation: Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India. Electronic address: bkarthik@nitt.edu.
authors.forename: B
authors.initials: B
authors.lastname: Karthikeyan
mesh_terms: D003460:Crystallization; D000431:Ethanol / Q000032:analysis*; D005682:Gadolinium / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D055100:Optical Fibers; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D000431:Ethanol; D005682:Gadolinium; D015034:Zinc Oxide
keywords: Ethanol sensing; Fiber-optic sensor; Gd doping; Red shift