Nano-thin films precursors of MgO and In2O3 were synthesized by sol-gel method and thin films were prepared by dip coating method.The influence of cataluminescence(CTL) signals of some organic gases on MgO thin film and In2O3 thin film with the preparing condition of colloid solution pH,calcination temperature and film layers were discussed.From the experimental data analysis,we can conclude that for detecting ethylene glycol methyl ether vapor,MgO thin film has the optimum CTL signal,under the condition as follows: the colloid solution of pH=8,calcinations temperature of 550 ℃,coating film of 5 layers.For detection of acetic acid vapor,In2O3 thin film has the optimum CTL signal,under the condition as follows: the colloid solution of pH=5,calcinations temperature of 550 ℃,coating film of 5 layers.

We report on a cataluminescence sensor for the determination of gaseous acetic acid. It is based on a 60-nm thick sol–gel film of In2O3 on a ceramic support. SEM, XPS and surface profiling were applied for its characterization. It is found that aluminum ions of the ceramic substrate penetrate into the film and produce a synergetic catalytic effect. The sensor displays high sensitivity and specificity for acetic acid, a low detection limit, a wide linear range and a fast response. No (or only very low) interference was observed by formic acid, ammonia, acrolein, benzene, formaldehyde, ethanol, and acetaldehyde. The sensor was successfully applied to the determination of acetic acid in spiked air samples. We also discuss a conceivable mechanism (based on the reaction products) for the cataluminescence resulting from the oxidation reaction on the surface of the sensor film.

A cataluminescence (CTL) sensor using Y2O3 nanoparticles as the sensing materials was proposed for the determination of ethyl acetate. This ethyl acetate sensor showed high sensitivity and specificity at the optimal temperature of 264 degrees C. Quantitative analysis was performed at a wavelength of 425 nm. The linear ranges of CTL intensity vs ethyl acetate concentrations were 2.0-250 ppm (r = 0.9965) and 250-6500 ppm (r = 0.9997) with a detection limit (3 sigma) of 0.5 ppm. There was no response or weak response when foreign substances such as formic acid, n-hexane, toluene, acetic acid, benzene, and formaldehyde passing through the surface of Y2O3 nanoparticles. The sensor had a long lifetime more than 80 h with 3600 ppm ethyl acetate. It had been applied successfully to determine ethyl acetate in artificial air samples. Copyright (C) 2009 John Wiley & Sons, Ltd.

MgO and Y2O3 nanoparticles were prepared by supercritical fluid drying (SCFD) method (280 degrees C x 7. 0 MPa x 30 min). It was found that the cataluminescence (CTL) intensities of some harmful gases on MgO-SCFD and Y2O3-SCFD nanoparticles were much higher than those on nanoparticles prepared by common drying (CD) method. A CTL sensor using MgO-SCFD as the sensing material was developed for the detection of vinyl acetate vapor. The proposed sensor showed high sensitivity and selectivity to vinyl acetate under the optimal conditions of temperature of 279 degrees C, wavelength of 425 nm and flow rate of 160 mL/min. The linear range of CTL intensity versus concentration of vinyl acetate vapor was 1. 8 - 1800 mg/m(3), with detection limit of 0. 7 mg/m(3). Under the optimized conditions, None or only very low levels of significant interference were observed while the foreign substances such as acetone, acetaldehyde, ethyl acetate, acetic acid, formaldehyde, ammonia, ethanol, benzene and methanol were passing through the sensor. This method allows rapid determination of vinyl acetate in air at workshop.

Using MgO film as sensing material, a cataluminescence sensor was proposed by the determination of ethylene glycol ethers (2-ethoxyethanol and 2-methoxyethanol). This ethylene glycol ethers sensor showed high sensitivity and specificity. With detection limits of 1.0ppm and 1.4ppm, the linear ranges of cataluminescence intensity versus ethylene glycol ethers concentrations were 2.0–2000ppm for 2-ethoxyethanol and 2.0–1500ppm for 2-methoxyethanol, respectively. The response time was less than 5s. Foreign substances passed through the surface of MgO film without response, such as ammonia, benzene, ethyl acetate, acetaldehyde, vinyl acetate, methanol, acetone, ethanol, acetic acid, formaldehyde, and isopropyl ether. The sensor could determine 2-ethoxyethanol and 2-methoxyethanol whether they existed alone or together in air samples.

A sensor for detecting dimethyl ether was designed based on the cataluminescence phenomenon when dimethyl ether vapors were passing through the surface of the ceramic heater. The proposed sensor showed high sensitivity and selectivity to dimethyl ether at an optimal temperature of 279 degrees C. Quantitative analysis were performed at a wavelength of 425 nm, the flow rate of carrier air is around 300 mL/min. The linear range of the cataluminescence intensity versus concentration of dimethyl ether is 100-6.0x10(3) ppm with a detection limit of 80 ppm. The sensor response time is 2.5 s. Under the optimized conditions, none or only very low levels of interference were observed while the foreign substances such as benzene, formaldehyde, ammonia, methanol, ethanol, acetaldehyde, acetic acid, acrolein, isopropyl ether, ethyl acetate, glycol ether and 2-methoxyethanol were passing through the sensor. Since the sensor does not need to prepare and fix up the granular catalyst, the simple technology reduces cost, improves stability and extends life span. The method can be applied to facilitate detection of dimethyl ether in the air. The possible mechanism of cataluminescence from the oxidation of dimethyl ether on the surface of ceramic heater was discussed based on the reaction products.

The cataluminescence (CTL) of ether on nanosized ZnWO4 was studied. A high sensitive and selective sensor for ether vapor was designed. Quantitative analysis was performed at an optimal temperature of 330 °C, a wavelength of 425 nm and a flow rate of 240 mL/min. The linear ranges of CTL intensity versus concentration of ether was 20–3500 ppm, with detection limit of 8.7 ppm. The relative standard deviation (R.S.D.) for five times determination of 1500 ppm ether was 1.3%. The response time of this system was less than 3 s. There is no response when ethanol, methanol, formaldehyde, benzene, ammonia, acetic acid, sevoflurane and chloroform pass though the sensor. Acetone and acetaldehyde show a little response at levels around 2.2% and 2.0% compared with the response of ether. The technique is a convenient and fast way of determining ether in air.

醋酸乙烯是一种应用广泛的工业化学品,主要用于生产聚醋酸乙烯酯,聚乙烯醇,工业涂料及粘合剂等.它是一种无色易燃有刺激性的液体,是潜在的人类致癌物质.目前用于检测醋酸乙烯蒸气的传感器极少报道.

A cataluminescence (CTL) sensor based on nanosized SrCO3 as catalyst, for quantitative analysis of the explosive gases of propane and iso-butane in a mixture was proposed. Two linear regression equations of the CTL intensity versus the gases concentration in the range of 1000 similar to 10000 mL/m(3) were established at two working temperatures of 320 degrees C and 342 degrees C, as the explosive gases show different sensitivities to the sensor at different temperatures. The detection limits (3 sigma) of propane and iso-butane are 50, 20 mL/m(3) respectively at 342 degrees C. The concentrations of the two components in a mixture are quantified by solving two simultaneous equations. No interference signals were observed while the foreign substances of carbon oxide and ammonia passed through the sensor. Methane and ethane caused interference around 5.6% and 17.2% respectively. 20 L/m(3) water vapor did not interfere with the determination of 2000 mL/m(3) propane and iso-butane vapors. The concentrations of the gases in two artificial samples were analyzed.