Preparation Of Nanomaterial Cataluminescence Sensor

Cataluminescence(CTL)sensors based on nanomaterials are an important branch of the sensor field.Cataluminescence sensors have the advantages of high sensitivity,good selectivity and fast response,so this sensor is expected to play an important role in different fields such as environment,medical treatment and so on.However,some problems encountered in the development stage of cataluminescence sensors,such as high operating temperature and poor stability,limit the application of the sensor in practice.In addition,different synthesis conditions of the same material may affect its cataluminescence response,and simplifying the development of pre-sensors also plays a crucial role in the performance and application of the sensor.This paper designs three kinds of cataluminescence sensors to provide new ideas for the development of sensors for detect gaseous contaminants.The main contents are as follows:Nano-magnesia with different morphologies was synthesized by direct precipitation method and hydrothermal method.The effects of different hydrothermal synthesis conditions on cataluminescence were discussed by designing orthogonal experiments.The results show that the hydrothermal conditions are:hydrothermal The temperature of 150?,the pH of the synthesis process solution=1?2,the hydrothermal time is 4h,the performance of the synthesized material is the best,and based on this material,the acetone cataluminescence sensor is designed.Under the optimal experimental conditions,the sensor is acetone(2.84?503.70mg/m3)showed a good linear relationship(R2=0.9991),the detection limit was 0.42mg/m3(S/N=3),and within 300h,the non-continuous measurement was 11 times,and the relative standard deviation was 4.13%.This indicates that the sensor has good stability.At the same time,the performance of the self-made heating module was tested.The results show that the cataluminescence intensity is improved by 15.56%compared with the commonly used vaporization method,and the experimental process is simplified.Four different morphologies of Al2O3 were synthesized under different hydrothermal temperatures by hydrothermal method.The cataluminescence experiments of four Al2O3 were carried out.It was found that the flower-like Al2O3 had the highest catalytic response to formaldehyde,under optimized experimental conditions.The concentration of formaldehyde in the range of 0.49-32.48mg/m3 showed a good linear relationship with the relative cataluminescence intensity(R2=0.9989),the detection limit was 0.23mg/m3(S/N=3),and the measurement was discontinuous within 300h.11 times,the relative standard deviation is 3.34%,indicating that the sensor has a good application prospect in the field of low concentration formaldehyde detection.The performance test results of the heating module show that the baseline recovery time is also shortened by 5 s based on the increase of the cataluminescence intensity of 11.28%.The orthogonal experiment of synthetic Mg/Fe nanomaterials was designed.The cataluminescence performance test and the data analysis of orthogonal experiment showed that the calcination temperature was 650?,the hydrothermal temperature was 150?,and the hydrothermal time was 4 h.Calcination time:6h is the best synthesis condition.The composite materials with Fe2O3 mass ratio of 1%,5%,10%,15%and 20%are synthesized.The cataluminescence properties are determined.Characterization In combination with cataluminescence testing,it was found that the appearance of the magnesium ferrite phase has an effect on the cataluminescence.The best catalytic material properties were tested.The results show that the response time to H2S is about 2.5s,and the linearity of H2S concentration is between 3?500ppm.The detection limit is 2.8ppm(S/N=3).The recovery rate of the sample is 97.5%?107.8%.In addition to the interference of isopropyl alcohol,methanol,ethanol and acetone slightly interfere with it,which can achieve rapid detection of H2S.