A Cataluminescence-Based Sensor for Detecting Benzene, Toluene and Xylene Vapors Utilizing the Catalytic Reduction on the Surface of Nanosized Al₂O₃/Pt

Abstract

A new gas sensor was designed based on cataluminescence (CTL) by using catalytic reduction of benzene, toluene and xylene (BTEX) on the surface of nanosized catalyst Al2O3/Pt with hydrogen as the carrier gas. The result indicated that the sensor showed strong CTL response, high selectivity and excellent durability under optimal conditions: Al2O3/Pt (1%), the temperature of 395oC, the wavelength of 425 nm and the flow rate of 270 mL/min. The detection limit (3σ) is 0.2 ppm for benzene, 0.3 ppm for toluene and xylene. Other corresponding substances such as methanol, ethanol, formaldehyde, acetaldehyde, ethylacetate, ammonia and trichloromethane had no or less interference. It is a simple and convenient sensor with good selectivity and sensitivity for detecting BTEX.

Peony‐like Na 2 Mg(CO 3 ) 2 : a nanomaterial with the characteristic of high sensitivity and rapid response for the detection of alcohols

“…The suitable working temperature and airflow are beneficial to the sensitivity of the sensor [22–27]. In order to explore the optimum conditions for the detection of the four alcohols, the effects of temperature and airflow on the relative CTL produced by the four alcohols on the surface of the material were investigated, respectively.…”

A cataluminescence sensor for the detection of trichloroethylene based on PEG200/ZnO nanocomposite

“…A large number of studies have shown that temperature and air flow rate have a great influence on the intensity of CTL [22][23][24][25][26][27]. Therefore, under the condition of keeping other conditions unchanged, we investigated the CTL intensity of trichloroethylene on the surface of PEG200/ZnO nanocomposite at different temperatures and air flow rate in order to obtain better response conditions, the specific results are shown in Fig.…”

“…3b shows that with the increase of air flow rate, CTL signal and signal-to-noise ratio (S/N) increase at first and then decrease. The reason for this result may be that when the air flow rate reaches a certain value, the contact time between the detector and the sensor is not enough, which reduces the sensitivity of the detection system [26,27]. Using this as a reference, the suitable carrier air flow rate of the sensor can be determined to be 180 mL / min.…”

Non-Invasive Rapid Detection of Lung Cancer Biomarker Toluene with a Cataluminescence Sensor Based on the Two-Dimensional Nanocomposite Pt/Ti3C2Tx-CNT

“…CTL refers to the phenomenon according to which when a catalytic oxidation reaction occurs at the gas-solid interface, the substance absorbs energy from the ground state and converts it into an excited state, and the excited state releases energy into the ground state, accompanied by chemiluminescence [13]. The CTL method based on nanomaterials is a new sensor detection method, which is widely studied and applied to the detection of volatile organic compounds (VOCs) in the environment [14][15][16][17][18][19]. Shi et al [20] prepared Pt/NU-901 nanocomposites for CTL sensors to detect acetone, a marker of diabetes.…”

“…Research shows that Pt has good oxidation resistance and high conductivity, and platinum can provide excitation electrons in CTL sensors. Therefore, adding it to a CTL sensor will further enhance the detection signal of the sensor and speed up its response and recovery time [19,[34][35][36]. Therefore, Pt was used as decoration to prepare Pt/Ti 3 C 2 T x -CNT catalyst in this paper.…”