SYNTHESIS OF NANOCOMPOSITES SnO2-GRAPHENE-Pd FOR HIGH SENSITIVITY CARBON MONOXIDE GAS SENSOR

• Main Author: DEBATARAJA (NIM : 33314005), AMINUDDIN
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25456
• Institution: Institut Teknologi Bandung

<p align="justify"> The performance of the gas sensor depends largely on the type and structure of the material (sensing material) used. SnO2 is one of the most widely used materials as a CO gas sensor because it’s long lifetime and is relatively stable, but has weaknesses such as high working temperature (> 350 oC), relatively high resistance (M&#937;) and less sensitive. To improve the performance of CO gas sensors can be done by utilizing nanostructured material to increase the contact surface, adding graphene and doping catalytic palladium dopants to improve sensitivity and selectivity. In this study, the synthesis of SnO2-graphene nanocomposite by polyol method and doped with Palladium (Pd) at various concentrations and tested its sensitivity to CO gas at various concentrations at working temperature from 50 to 350 oC, has been done. SnO2-graphene-Pd nanocomposite was characterized by XRD, SEM, TEM, TG-DTA, BET, and FTIR to determine the crystal structure, morphology and particle size. The result of characterization of SnO2 with TEM shows that the particle size is in the range of 5-8 nm. The result of the test on the addition of graphene to SnCL2.2H2O prekursor with composition (1:1), showed an increase of sensitivity of response to CO gas at concentration 30 ppm from 52.84% to 88.11% at 150 oC, and resistance in range of 10 k&#937;. Furthermore, with 30 ppm CO gas and working temperature of 150 oC, the optimum doping of Pd to SnO2-graphene was 0.1%, where the sensitivity increased from 88.11% to 92.99%. In addition, the response test of Pd doping of 0.1%, 0.5%, and 1% at 50-350 oC working temperature with 10 ppm CO gas, result in highest sensitivity showed by Sample A (1:1)-0.1%Pd with sensitivity of 99.89%. Sample A (1:1) doped with 0.1% Pd, showed the highest sensitivity to CO gas at a concentration of 10 ppm with a working temperature of 250 oC. The results show that SnO2-graphene-Pd nanocomposite can be applied to high performance CO gas sensor. <p align="justify"> <br /> <br />