Nanosized γ‐Al₂O₃ + Nd₂O₃‐based cataluminescence sensor for ethylene dichloride

Abstract

A gas-sensor utilizing cataluminescence (CTL) on nanosized gamma-Al2O3 + Nd2O3 for measuring low concentrations of gaseous ethylene dichloride (EDC) was developed. The results showed that gamma-Al2O3 nanoparticles as a catalyst offered high sensitivity and selectivity in the detection of EDC. The addition of a small quantity of Nd2O3 increased the intensity of CTL more than two-fold. Quantitative analysis was performed at a wavelength of 400 nm and at an optimal temperature of 279 degrees C, and the optimal flow rate of carrier gas was 320 mL/min. Under the optimized conditions, the linear range of CTL intensity vs. concentration is 6-5000 ppm (R = 0.9996; n = 7), with a detection limit of 2 ppm. The response time is <5 s. No interference or only very low levels of significant interference were observed when substances such as formaldehyde, n-hexane, methyl benzene, carbon tetrachloride, chloroform and benzene were passed through the sensor.

Recent advances in methodologies and applications of cataluminescence sensing

“…Generally speaking, CTL-based sensors since their inception have been established mainly for specific gas detection. CTL sensors based on the sensing elements of nanomaterials have broad application for monitoring various VOCs [50] including alcohols [29,[51][52][53][54] , aldehydes [55,56] , ketones [28,[57][58][59][60][61][62] , esters [63] , ethers [64][65][66] , acids [67] , hydrocarbon [47,68,69] , halohydrocarbon [70] , and inorganic small molecule gases [71] , including H 2 S [72][73][74][75][76][77] and CO [21,48,78] , all of which have contributed significantly to environmental monitoring. In addition, the selective detection of some analytes has also functioned to promote medical research and clinical diagnosis.…”

Studies of the Cataluminescence of Benzene Homologues onNanosized γ–Al2O3/Eu2O3 and the Development of a Gas Sensorfor Benzene Homologue Vapors

“…The schematic diagram of the CTL detection system which was presented before [19] is shown again in Figure 1 …”

“…With the expanding availability of nanoparticles, nanosized ZrO 2, TiO 2 , BaCO 3 , SrCO 3 and γ-Al 2 O 3 doped with Nd 2 O 3 -based CTL sensors for determination of gas samples, such as ethanol, acetaldehyde, acetone and ethylene dichloride have been reported [14][15][16][17][18][19]. Since nanoparticles have higher surface areas, higher adsorption characteristics and higher activity than bulk materials, they can be applied in sensitive, miniaturized gas sensors.…”

A novel and sensitive formaldehyde gas sensor utilizing thermal desorption coupled with cataluminescence

“…Zhang et al [20][21][22][23] proposed a new way for detecting some poisonous gases based on CTL by using nanosized materials. Recently, CTL has been applied to determine various VOCs [24][25][26][27][28][29][30][31][32][33][34], in terms of the advantages of simplicity, rapid response, solvent-free. But, for some threshold level of poisonous gases under 0.1 mg/m 3 , this methodology was not of enough high sensitivity.…”