Abstract
A liquefied petroleum gas (LPG) sensor with high selectivity, sensitivity and low power consumption has been developed based on indium oxide with very low resistance. Nanocrystalline In2O3 gas sensing materials were directly synthesized through a one-step controllable solvothermal process at 210°C for 24 h, using InCl3·4H2O as the starting material, cetyltrimethyl ammonium bromide (CTAB) as additive and ethanol as the solvent. The obtained samples were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that indium oxide takes on uniform cubic shape with range size of 10∼30 nm and fine dispersivity. Gas sensitivity was measured in a mixing static gas. The results indicated that 3.0 V is the best working voltage of the sensor to LPG. Sensitivity is 12.6. The response-time and recovery-time are 3 s and 10 s respectively. Power consumption is only around 200 mW.
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