A Research Of Self-powered Acetone Sensors

The self-powered gas sensor is a newly developed type of sensor,which has broad application prospects in the industrial,medical and energy fields.because of its new concept and many advantages including independent energy supply,low cost,environmental friendliness,wide source of materials and good stability.In addition,the self-powered gas sensor based on the working principle of the triboelectric effect?triboelectric electrification and electrostatic induction?can allow the integration of gas detecting devices without additional power supply through generating a large amount of triboelectricity.However,the gas sensor is still in the early stage of exploration and research.In this paper,high performance self-powered gas sensors were designed and fabricated according to the principle of friction generator.Chitosan,aminated graphene,cellulose acetate and WO₃ were used as sensitive materials to detect acetone.The contact-separated self-powered acetone sensor was designed based on the contact-separated friction generator.The current,voltage and frequency were tested.The suitable parameters were selected for the sensor test.The response of chitosan film modified by aminated graphene and pure chitosan film to acetone was compared.And tested the effects of different mass ratios,humidity response,selectivity and stability.Under the condition of 97.3%RH,the ratio of chitosan to aminated graphene solution was 1:3,1:5,and the responsibility of the film to 10 ppm acetone was 70.36%and65.65%.The response of the composite chitosan film is 5 times that of the pure film.It shows that the chitosan has a significant increase in the response to acetone after the addition of aminated graphene.A 1:5 ratio of chitosan to aminated graphene solution was tested at different humidity levels,and it was found that the greater the humidity,the greater the response to acetone.Based on the single-electrode friction generator,an inductive self-powered acetone sensor was designed.and its friction material,current,voltage,frequency and distance were tested.The friction materials were selected as PTFE and nylon.Acetone was tested using chitosan and chitosan and aminated graphene film.Under the same experimental conditions,the responsivity of chitosan film to 10 ppm acetone was 4.25%,and the responsivity of mixed film was 27.89%.Compared with the contact separation method,the response is low.And it was tested for stability and found to be more stable than contact-separated.A cellulose acetate film and a cellulose acetate-based WO₃ film were prepared and applied to an inductive self-energizing acetone sensor,and acetone was tested with dry air as a carrier gas,the thickness influence,selectivity and stability were tested.The experimental results show that the response of cellulose acetate based WO3film to 10 ppm acetone was 15.12%.The devices with spin-coated 2,4,and 6-layer films were compared.The experimental results show that the larger the film thickness,the smaller the response.