Investigations Of Cataluminescence Gas Sensor Based On Rare-earth Complexs

Cataluminescence technology is developing rapidly in recent years,especially in the detection of volatile organic compounds.The sensor based on cataluminescence have significant functions in the part of environmental safety,emissions control,medical health and so on.Compared with the large instruments which is huge and complicated to operate,CTL gas sensor possess the advantage of simple instrument which easy to operate,high efficiency and fast,and easy to be miniaturized,and show a distinct advantage on the real-time online monitoring.The development of Sensitive materials which is low temperature,economy and efficient is reasch focus.Rare-earth materials show excellent luminescence performance among various of materials.However,rare-earth complexes with excellent luminescence performance have no application in Cataluminescence.Take account of that,the article used rare-earth complexes as the sensor’s sensitive material,and designed three types of cataluminescence gas sensor.In addition,It can expand the types of sensitive materials,and provide new idea for development and application of CTL gas sensor.1.A cataluminescence sensor was proposed for determinative of N-propanol,with DyBO₃ as the sensing material.Quantitative analysis was performed at a wavelength of 535 nm,and at an optimal temperature of 150 ℃,and a flow rate of 200 m L/min.The liner range of CTL intercsity versus concentrations of N-propanol was 40¹800 mg/m3（R=0.9955）,and the detection limits was 15 mg/m3.There was no response or weak response when foreign substances pass throuth the surface of DyBO₃.In addition,the sensor also shows good stability and longer lifetime more than 45 h with 300mg/m3 N-propanol.2.The content of the experiment is to research the cataluminescence re responses of epichlorohydrin（ECH）on the surface of nano-layer YBO₃.And then,a new method of detecting ECH in the air has be proposed.This method has good selectivity and lower work-temperature.In addition,the respond of ECH in low concentrations is so rapid that pesking just for 1 second.The liner range of CTL intercsity versus concentrations of ECH was 10-1100 mg/m3,and the detection limits was 2.9 mg/m3.The range of recovery is from 101% to 104%,indicating that the method can be used for the montoring of ECH.3.The cataluminescence of aceton on the surface of Ce₂（C₂O₂）₃ was studied after the expedition of cataluminescence phenomenon.Compared with the sensor of acetone in previous reports,the sensor has the characteristics of economy,simple and lower work-temperature.Additionally,There was no response or week response when foreign substances pass through the surface of Ce₂（C₂O₂）₃,excepting for ether and propionaldehyde.4.It was found that ether produce a strong luminescence on the surface of cerium citrate.The gas sensor was designed to detect ether after the expedition of effects from temperture,wavelength and velocity.The sensor has a low operating temperature,and can be used for detection of actual samples.