Structural, optical and ethanol sensing properties of Cu-doped SnO2 nanowires

Abstract

In present work, one-dimensional nanostructure of Cu-doped Tin oxide (SnO 2 ) was synthesized by using thermal evaporation method in a tubular furnace under Nitrogen (N 2 ) ambience. The growth was carried out at atmospheric pressure. SEM and TEM images reveal the growth of wire-like nanostructures of Cu-doped SnO 2 on Si substrate. The XRD analysis confirms that the synthesized SnO 2 nanowires have tetragonal rutile structure with polycrystalline nature and X-ray diffraction pattern also showed that Cu gets incorporated into the SnO 2 lattice. EDX spectra confirm the doping of Cu into SnO 2 nanowires and atomic fraction of Cu in nanowires is ~ 0.5 at%. The Vapor Liquid Solid (VLS) growth mechanism for Cu-doped SnO 2 nanowires was also confirmed by EDX spectra. The optical properties of as grown Cu-doped SnO 2 nanowires were studied by using UV-vis spectra which concludes the band gap of about 3.7 eV. As synthesized single Cu-doped SnO 2 nanowire based gas sensor exhibit relatively good performance to ethanol gas. This sensing behaviour offers a suitable application of the Cu-doped SnO 2 nanowire sensor for detection of ethanol gas.

Specific challenges faced by the eight key occupational groups

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