Paper NS+2D+AN+EM+MN+MP+PC+RM-MoM3
Morphology-Controlled Large-Scale Tin Oxide Nanostructures for Highly Sensitive Room Temperature Gas Sensor

Monday, October 22, 2018, 9:00 am, Room 102B

Highly sensitive large-scale tin oxide (SnO₂) nanostructures were grown on a glass substrate by vapor-liquid-solid (VLS) process using a mixture of anhydrous tin (II) chloride (SnCl₂) and zinc chloride (ZnCl₂) powders. We demonstrate a new kind of single cell vapor deposition system to precisely control nanostructural morphology by changing the weight ratio of SnCl₂ and ZnCl₂ and growth temperature. The morphology and structural property of as-grown nanostructures were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The SEM images revealed that the SnO₂ nanostructures with different densities, sizes, and shapes can be achieved by adjusting the weight ratio of SnCl₂ and ZnCl₂. SnO₂ nanostructures with diameter ~20 nm and length ~100 nm showed ~85% sensitivity and 53 seconds of response time, whereas the nanorods with diameter ~100 nm and length ~ 1mm showed ~50% sensitivity with 198 seconds response time. The nanostructured material with small size and shape showed better sensitivity on sensing at room temperature compared to previously reported SnO₂ based sensors.