Real-Time Monitoring of Acetaldehyde in Air by Cataluminescence-Based Gas Sensor

Abstract

A highly sensitive, simple and selective gas sensor was developed for the determination of trace acetaldehyde in air based on cataluminescence (CTL) on nano-sized Al2Ti2O7. The gas sensor showed high selectivity for acetaldehyde at 515 nm and satisfying activity at 295°C. The linear range of the CTL intensity versus concentration of acetaldehyde was 1~65 mg/m3, and the detection limit (3σ) was 0.5 mg/m3. No interference was observed while the foreign substances, such as ammonia, ethanol, formaldehyde, benzene, carbon monoxide and sulfur dioxide, were passing through the sensor. The gas sensor displayed good stability for continuously introducing 10 mg/m3 acetaldehyde over 60 h, and allowed real-time monitoring of acetaldehyde in air.

Rapidly detecting the carcinogen acetaldehyde: preparation and application of a flower-like MoS2 cataluminescence sensor at low working temperature

“…When the excited is back to the ground state, its luminescence wavelength is 505–515 nm, which is in the range of visible light, so it can be captured by the measuring system in our study (formula (3)–(8)). 50,51,57,58 O 2 (gas) → O 2 (ads)O 2 (ads) + 2e − → 2O − (ads)CH 3 CHO (gas) → CH 3 CHO (ads)CH 3 CHO (ads) + O − → CH 3 COOH + e − …”

“…23 Compared with other CTL acetaldehyde gas sensors, the optimal temperature of the present method is 174 °C, which leads to a good performance (Table 1). [48][49][50][51] 3.5. Effect of ow rate on CTL intensity Fig.…”

The Emergence of Solar Photovoltaic Technology in Indonesia: Winners and Losers

“…First, it implies that PLN prioritises geothermal, hydro, and waste energy in their electricity share. Second, the enactment of BOO scheme will help capital incentive renewable energy project (such as geothermal) induces its competitiveness to other renewable energies [26]. Thus, the new regulation puts solar PV position in jeopardy among other renewable energy sources.…”

Determination of Dimethyl Ether in Air by Cataluminescence-Based Gas Sensor

“…Cataluminescence (CTL) is an emission produced by excited intermediates which can emit rays on falling to the ground state during catalytic oxidation reactions. Recently, CTL-based gas sensors on various nanomaterials have been reported for the determination of butanone on Mg 2 AlO 7/2 [4], BTX on Cu 4 Mn 3 FeO x [5], formaldehyde on V 2 Ti 4 O 13 [6] and Mo 4 V 6 Ti 10 O 47 [7], ethanol on Ti 10 Zr 4 La 2 O 31 [8], ammonia on TiW 3 Cr 2 O 14 [9], acetone on Cr 4 TiO 8 [10], trimethylamine on Y 2 Ti 3 O 9 [11], hydrogen sulfide on Mn 1.5 Zr 2 O 7 [12], and acetaldehyde on Al 2 Ti 2 O 7 [13] in our labouratory, and have drawn great public attention due to their unique advantages of high sensitivity, rapidity, high selectivity and simplicity.…”