Study On The Characteristics Of Low-temperature Plasma And Its Application In The Preparation Of Graphene Aeroge

This thesis focuses on the discharge characteristics of low-temperature plasma and its application to the preparation of graphene aerogels.In the study of the discharge characteristics of low-temperature plasma,the effects of electrode distance,gas flow rate,and applied voltage on the discharge characteristics in a double-ring electrode discharge device are first analyzed,and a sieve electrode discharge device is proposed for its discharge inhomogeneity,and the effects of sieve aperture,gas flow rate and applied voltage on its discharge characteristics are investigated.In the research of graphene aerogel preparation,the traditional methods such as in-situ assembly method,template method,and chemical cross-linking method are mainly used at present,but the above methods have defects such as long reaction time,not environmental protection,and complicated preparation technology respectively,while plasma is an ionized gaseous material with certain energy distribution of electrons,ions,and neutral particles,rich in active particles and free radicals,which can interact with the material surface It has significant advantages in material treatment.This paper therefore applies low-temperature plasma to the treatment of graphene oxide materials and proposes a method for the preparation of graphene aerogels using plasma.By investigating the discharge characteristics,graphene oxide was treated using a screen electrode discharge device under conditions that produced the best plasma uniformity and efficiency,and the changes in the physicochemical properties of the graphene material after the plasma treatment were investigated.The results of the study on the discharge characteristics of the screen electrode and the preparation of graphene aerogel by plasma show that increasing the gas flow rate and reducing the aperture of the screen electrode discharge device can improve the uniformity of the argon gas discharge,and the increase of the gas flow rate can further increase the concentration of the active particles generated by the gas discharge,which is beneficial to the treatment of graphene oxide materials.After plasma treatment,graphene oxide undergoes a reduction reaction to form graphene aerogels with rough and irregular folds and a richer three-dimensional network structure,which increase the specific surface area of the aerogels and facilitate the formation of super light and easily compressible aerogels.The plasma-prepared graphene aerogel has increased hydrophobicity due to the large reduction of oxygen-containing functional groups,which improves its application range and lifetime.