Abstract
One-dimensional nanostructures of Tin oxide (SnO2) have been synthesized by thermal evaporation method with and with out a catalyst on silicon substrate. The nanostructure growth was carried out by using a mixture of SnO2 and graphite powders at a temperature of 1050°C in nitrogen (N2) ambience. The synthesized SnO2 nanostructures show polycrystalline nature with tetragonal rutile structure. SEM investigation reveals wire-like and rod-shaped nanostructures on silicon substrate, with and without the gold catalyst layer respectively. EDX and TEM observation concludes that the uniform SnO2 nanowires (diameter ∼ 25 nm and length ∼ 50 μm) grow with vapor-liquid-solid (VLS) mechanism whereas, the SnO2 nanorods with varying diameter grow with vapor-solid (VS) mechanism. UV-Vis spectra estimates that the optical band gaps of the SnO2 nanowires and nanorods were 3.92 eV and 3.67 eV respectively. As synthesized single SnO2 nanowire based gas sensor exhibit relatively good performance to ethanol gas. This sensing behaviour offers a suitable application of the SnO2 nanowire sensor for detection of ethanol gas.
Highlights
Growth of one‐dimensional (1D) nanostructures has attracted increasing attention in recent year due to research and practical applications of these novel structures in ‐ generation devices and sensors. [1,2]. 1 D nanostructures may be formed in the form of tubes, belts, rods, wires, etc
3.1 Morphology and optical characterizations Fig. 1 and Fig. 2 shows the typical scanning electron microscopy (SEM) images of the samples annealed at 1050°C for two hours in the N2 ambience
Further insight into the detailed structure of the SnO2 nanostructures is taken by Transmission Electron Microscope (TEM)
Summary
Growth of one‐dimensional (1D) nanostructures has attracted increasing attention in recent year due to research and practical applications of these novel structures in ‐ generation devices and sensors. [1,2]. 1 D nanostructures may be formed in the form of tubes, belts, rods, wires, etc. Thermal evaporation is the most popular method for the growth of nanostructures due to its process simplicity, easy‐to‐handle equipment, low cost infrastructure and high throughput. This method can be used to synthesize several types of nanostructures such as nanowires, nanobelts and nanorods. We have synthesized SnO2 nanostructures by thermal evaporation method with and without gold thin film on Si substrate. This assembly with SnO2 nanowire bridging between sensor electrodes were post annealed in air at 300°C for 1 hour This fabricated sensor was than used for the study of I‐V characteristics and ethanol gas sensing properties of single SnO2 nanowire
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
