Synthesis of CuO/SnO2 NPs on quartz substrate for temperature sensors application

Abstract

Temperature sensor of p-CuO/n-SnO2 heterojunction was successfully fabricated and investigated. SnO2 nanostructure was firstly synthesized via chemical vapor deposition. Followed by a top layer of CuO nanoparticles was deposited on SnO2 by drop cast method. The SnO2 film was analyzed via x-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD confirms the formation of the SnO2 nanstructure .The SEM reveals the SnO2 nanoparticles agglomerated together forming a cauliflowers-like nanostructure with a calculated particle size of 17nm. The temperature response corresponding to the relative variation of sensor resistance (ΔR) to a given temperature was measured. It was found that the present sensor has a high sensitivity of 0.56%/°C. Temperature sensor p-CuO/n-SnO2 heterojunction was found to be quite promising material in the temperature range of 25-200⁰ C.