科研之友
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摘要
A novel and highly sensitive gas sensor for alcohols (methanol, ethanol, propanol, isopropanol, butanol, and isobutanol) was proposed based on cataluminescence (CTL) on the surface of nano-CdS. Using cetrimonium bromide (CTAB) as template, the nano-sized sensing material CdS was successfully obtained by a simple hydrothermal synthesis process. The luminescence characteristics and the experiment conditions were investigated in detail. Under the optimized conditions, little interference was observed while eleven foreign substances were passing through the sensor. It demonstrated that this gas sensor has high selectivity for alcohols. The calibration curve (y = kx + b) of the relative CTL intensity versus the concentration of methanol was made, with the linear range of 1.2-76.1 mu g mL(-1) and the detection limit of 0.5 mu g mL(-1) (S/N = 3). The relative standard deviation (R.S.D.) (n=7) of relative cataluminescence intensity for 58.5 mu g mL(-1) methanol was 4.3%. There was no significant change of the catalytic activity of the sensor for a week, with R.S.D. less than 5% by collecting the CTL intensity every hour. The method can be applied to detect alcohols in the air. The possible mechanism of CTL on the surface of nano-CdS was discussed preliminarily.
- 出版日期2013-9
- 单位四川大学
