Optimization of Working Conditions by Response Surface Methodology of Sulfur Dioxide Gas Sensors Based on Au/CoO‐2La₂WO₆ Nanoparticles

Abstract

In the past, the working conditions of cataluminescence (CTL) method were simply determined by single factor experiment. This paper will illustrate the optimization of working conditions of a novel sulfur dioxide gas sensor based on Au/CoO-2La 2 WO 6 nanoparticles by response surface methodology (RSM). Under optimized working conditions, analytical wavelength 522.77 nm, reaction temperature 111.15°C and carrier gas velocity 144.92 ml/min, the sensitivity of the method can be increased by 6.4 %. The optimization process is universal for many multi parameter processes. There is a good linear relationship between the CTL intensity and the concentration of sulfur dioxide in the range of 0.06-120 mg/m 3 with a detection limit (3σ) of 0.015 mg/m 3. The sensing properties of sensitive material were investigated. The results indicated that nano-Au/CoO-2La 2 WO 6 could be a good candidate for fabricating sulfur dioxide gas sensors.

Novel Diethyl Ether Gas Sensor Based on Cataluminescence on Nano-Pd/ZnNi3Al2O7

“…For the loading of nano-Pd/ZnNi 3 Al 2 O 7 , the adjustment of working temperature, the introduction of the measured gas sample, and the recording of CTL signals, one can refer to our previous work. − …”

“…CTL, a kind of chemiluminescence (CL) emitted from heterogeneous catalytic oxidation reactions on the gas–solid interface, has been considered as a promising energy transduction mechanism for fabricating gas sensors . In recent years, a series of CTL sensing applications have been attempted to develop for diethyl ether − and many other molecules − at different laboratories. However, a higher working temperature above 200 °C is not conducive to the stability of the sensor signal …”

“…The main working conditions for the determination of diethyl ether by the CTL method, such as analytical wavelength, working temperature, and carrier gas flow rate, are not isolated but interact with each other. The response surface method (RSM) is a statistical comprehensive test technique. − ,− It takes the response of the system as a function of many factors and displays the functional relationship by the graphic technology. In this way, we can choose the optimal conditions in the experimental design by intuitive observation.…”

Enhanced Acetaldehyde Sensing Performance of Spherical Shaped Copper Doped ZnO Nanostructures

“…Thus, the increased depletion width at the CuO/ZnO interface and the decreased number of CuO holes caused an increase in resistance. Consequently, the sensor‘s response depends on both the net change in hole concentration and the width of the depletion region [44–57] …”

“…Consequently, the sensor's response depends on both the net change in hole concentration and the width of the depletion region. [44][45][46][47][48][49][50][51][52][53][54][55][56][57] After acetaldehyde gas sensing change in morphology of CZ9 sensor After gas sensing study, FE-SEM was done to understand if there was any change in the CZ9 sensor morphology. Figure 9 shows slight distortion in morphology of CZ9 sensor.…”