Abstract
In2O3 nanostructure sensors were fabricated by arc-discharging a source composed of a graphite tube containing indium. The NO gas sensing properties, as well as the morphology, structure, and electrical properties, were examined at room temperature under UV light illumination. In particular, the response and recovery kinetics of the sensor at room temperature under various UV light intensities were studied. The maximum response signal was observed at an intermediate UV light intensity, which could be corroborated by a nano-size effect based on the conduction model of a resistive chemical nano sensor. The mechanism for the enhanced adsorption/desorption kinetics for NO in an air environment under UV light irradiation is discussed in detail. Furthermore, the general requirements of the sensor, including the stability, repeatability, and selectivity, are discussed.
Highlights
Indium oxide (In2O3) is an n-type semiconductor that has a relatively high electrical conductivity in its non-stoichiometric form[27]
Arc-discharge is a well-known method for the synthesis of both single- and multi-walled carbon nanotubes (CNTs)[30,31,32]
When a graphite rod containing catalytic metals is used as the arc-discharge source, the extremely high temperature involved in the arc-discharge process facilitates the synthesis of highly crystalline, single-walled CNTs via the vapor-liquid-solid synthesis route through the molten catalyst metal nanoparticles
Summary
Indium oxide (In2O3) is an n-type semiconductor that has a relatively high electrical conductivity in its non-stoichiometric form[27]. We developed a new synthesis method or co-arc-discharge method for indium oxide nanostructures. The method simultaneously employs the arc-discharge of carbon and indium using a graphite tube containing indium powder as the arc-discharge source. This co-arc-discharging of In and graphite produced running wires of agglomerated indium nanoparticles on the substrate mounted on the inside wall of the chamber. The UV light excites electrons from the valence band, which increases the electron and hole populations in In2O3 and supplies energy to the adsorbing and desorbing molecules on the surface, leading to fast adsorption and desorption kinetics. We scrutinized the light effect on the NO gas adsorption/desorption behaviors on and from In2O3 nanoparticles
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