Development Of A Screening Platform For Composite Materials Of Metal Oxide Gas-sensitive Membranes

With the development of social economy and the deepening of industrialization,air pollution has threatened life quality of human beings.Faced with toxic and harmful gases in production and living environments,we need high-performance gas sensors for monitoring and early warning.Metal oxide semiconductor sensors are widely used due to their low cost,ease of integration,small size,and simple signal measurement.The performance?selectivity,sensitivity?of metal oxide materials in response to gases is not only related to a variety of factors such as microscopic morphology,doping,surface modification,and material recombination,but also related to the working conditions?temperature,humidity,light,etc.?.Therefore,optimizing the screening of excellent gas sensitive materials involves many factors.By synthesizing and characterizing materials through the“combinatorial materials”method,it is possible to rapidly discover,study,and optimize known or unknown materials,and improve the efficiency of materials with superior screening properties.Material synthesis and performance testing are the most fundamental steps in the research,optimization,and screening of metal oxide gas-sensitive material arrays with excellent gas-sensitive properties.Material synthesis is also the first step in studying materials.The"parallel synthesis"method in"composite material science"is applied to the synthesis of metal oxide gas sensitive materials.Simultaneously preparing a library of material samples with a number greater than 1 can rapidly improve the material screening efficiency.The current parallel synthesis technology for the screening of gas sensitive materials is mainly inkjet printing technology.But its existence:?1?poor adaptability of raw materials,?2?particles tend to block needles,?3?uneven distribution of ingredients and other issues.Material performance testing is a critical step in the study of materials."Combination Materials""High-throughput characterization"method is applied to a metal oxide gas-sensitive material performance test,performance test multiple samples to be tested,the material quickly improve screening efficiency.Current high-throughput characterization techniques for gas sensitive material screening are primarily based on multi-electrode chips.However,the present method:?1?non-uniform temperature field and air,?2?poor hardware scalability.Due to the existing combined material science method,the above-mentioned deficiencies exist in the screening of metal oxide gas sensitive materials.First,to optimize the deficiencies in the above methods,this project uses the"parallel synthesis"and"high-throughput characterization"concepts in combinatorial materials science to design a solution that can solve the above-mentioned deficiencies,but also has automation,Convenient,high-precision,modular,unmanned test and other characteristics of the metal oxide gas sensitive composite material screening platform for material synthesis and characterization.Secondly,this subject evaluated the premixing function of the metal oxide gas sensor film synthesizer through pigment experiment and methyl orange experiment.The results show that the precision of premixing is about 1.8178?L and the error of premixing is about 0.091%.Then,through the screening optimization,the appropriate additive was selected for the metal oxide slurry addition component,and the metal oxide gas sensor film synthesiser transfer printing was evaluated with multi-component film formation and gas sensitivity test.The results show that the film diameter could be controlled.Finally,on the parallel synthesis instrument for metal oxide gas sensor films,96 kinds of SnO₂-based surface modified gas-sensitive material films were prepared in parallel,and a high-throughput gas-sensing material performance test platform was used to perform gas-sensing performance of high-pass.Quantitative characterization,optimized and screened a six-element array with high response sensitivity and selectivity for 9 kinds of toxic,harmful,flammable and explosive gases.