Development Of Portable Ceramic Gas Sensor

Nurhafiza , Fadzil (2011) Development Of Portable Ceramic Gas Sensor. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Sensing of carbon monoxide (CO) from motorcycle was carried out for pure ZnO, ZnO/CuO heterocontact, and layered ZnO/CuO heterocontact. The materials were crushed using pestle agate mortar and sieved at 40μm mesh. The particle size of powder for ZnO and CuO were observed using particle analyzer machine. All the samples were fabricated in the form of pellet using uniaxial dry pressing for 2 tonnes/cm³ and cold isostatically press at 28427.4psi and sintering at 800°C for 3 hours. The layered ZnO/CuO samples were fabricated by sequentially pressing ZnO and CuO powders in a die followed by sintering at 800°C for 3 h. The samples were added with binder such as glycerol and stearic acid to provide strength of green body. During sintering, the binder were burn out at 295°C for glycerol and 388°C for stearic acid for 30 minute with heating rate 2°C/ minute. The effect of sintering was characterizing using SEM and XRD. The responses of CO gas were measured using multimeter and concentrations of gas were measured using gas analyzer. The study observed that ZnO/CuO heterocontact showed higher sensitivity to CO gas than pure ZnO. CO gas will increase with increased speed from motorcycle and current

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