Pembangunan dan pengoptimuman pelet bermangkin untuk pengesanan karbon monoksida bagi sensor kebakaran
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Date
2005-09
Authors
Abdullah, Syamsul Bahari
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Abstract
The utilization of semiconductor based sensor pellet in most of gas and fire detectors
has gained a lot of interest in safety technology. This approach gives numerous
advantages such as the simplicity in device structure, low cost fabrication, robustness in
practical application and adaptability to a wide variety of reductive and oxidative gases.
This tech;1ology involves the detection ana conversion of gases evolved from fire such
as carbon monoxide (CO)Jo carbon diox:de (C02) on the rellet via catal~1ic reaction_._ _
The objective of the current research is to develop and optimize a composite
catalytic pellet capable of detecting CO at lower concentration and temperature. Various
composite sensor pellets comprising of Sn02 as the substrate and ZnO as the dopant
were made. The influences of ZnO composition, pellet thickness and the third metal
oxide as dopant have been investigated through electrical conductivity and sensitivity
towards carbon monoxide.
The results showed that pellets containing 3wt% ZnO and 2mm thickness gave the
optimum sensitivity towards CO. The sensitivity was improved by adding powder
lanthanum oxide (La20 3} as the third dopant. The sensing temperature was further
reduced by adding La20 3 obtained from adsorption of five cycle of 0.5 x 1 o·2M liquid
LaC b. 7H20 and calcined at 850°C.
Based. on Three Level Factorial Design ·for optimization study, the generated
equation model showed R squared value approximately 1.0. The predicted optimum
sensitivity was 98.9%.
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Keywords
pengoptimuman pelet bermangkin , karbon monoksida , Sensor kebakaran