A highly sensitive and selective dimethyl ether sensor based on cataluminescence.
Summary of "A highly sensitive and selective dimethyl ether sensor based on cataluminescence."
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 425nm, the flow rate of carrier air is around 300mL/min. The linear range of the cataluminescence intensity versus concentration of dimethyl ether is 100-6.0x10(3)ppm with a detection limit of 80ppm. The sensor response time is 2.5s. 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.
Environmental Science and Engineering Institute, Guangzhou University, 510006 Guangzhou, China.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20602961
- DOI: http://dx.doi.org/10.1016/j.talanta.2010.05.039
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