Sensitive Carbon Monoxide Gas Sensor Based on Chemiluminescence on Nano-Au/Nd₂O₃–Ca₃Nd₂O₆: Working Condition Optimization by Response Surface Methodology

Abstract

An Au/Nd 2 O 3 –Ca 3 Nd 2 O 6 composite was synthesized by the sol–gel and impregnation method. The EDS spectrum and the transmission electron microscopy image showed that Au atoms are uniformly distributed on the surface of Nd 2 O 3 –Ca 3 Nd 2 O 6 with a size of less than 50 nm. A sensitive carbon monoxide gas sensor based on chemiluminescence at a temperature lower than 200 °C was reported. There is a good linear relationship between the chemiluminescence intensity and the concentration of carbon monoxide in the range of 0.6–125 mg/m 3 . The detection limit (3σ) is 0.2 mg/m 3 . The working conditions optimized by the response surface methodology were an analytical wavelength of 620.90 nm, a reaction temperature of 131.63 °C, and a carrier-gas velocity of 105.46 mL/min. The sensitivity of the method can be increased by 4.5% under the optimized working conditions, which is especially important for the determination of trace substances. The carbon monoxide sensor demonstrated in this paper can be used for practical applications. The optimization method is universal for many multiparameter processes.

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.…”

Enhancement of CO gas sensing performance by Mn-doped porous ZnSnO3 microspheres

“… 2 The detection of CO is equally tricky owing to its colorless and odorless properties. 3 It can cause death by forming carboxyhemoglobin by mixing with blood during breathing. 4 Note that the exposure limit for CO is 50 ppm; hence precise monitoring is essential to reduce disastrous effects.…”

Optimization of Spray-Drying Process with Response Surface Methodology (RSM) for Preparing High Quality Graphene Oxide Slurry

“…Response surface methodology (RSM), as a statistically based optimization strategy, is widely used to evaluate the influence of several independent variables on one or more responses, which significantly reduces the trial numbers for analyzing multiple variables and their interactions and is very useful for experimental and industrial designs [17][18][19]. In this work, single-factor experiments are first performed to determine the appropriate range of operating parameters, including the nozzle flow rate (QA), atomization pressure (PA), and liquid feed rate (QL) which are chosen as independent variables.…”