The Research Of Graphene-gold Nanosheets Multilayers Photothermal Conversion

Photothermal materials prepared from graphene and Au nanoparticles have received increasing attentions in various fields ranging from smart devices to advanced medical therapies. r GO and Au nanoparticles are two types of promising photothermal materials that received extensive attentions. Composite materials made from both type of material may further enhance material performance. In this thesis, we preprared poly(acrilic amine)-modified rGO(PAH-rGO) and Au nanosheet(AuNS) that absorb infrared light of 940 nm, and further prepared multilayered materials using PAH-rGO AuNS as building uints. The photothermal transition effects of layer-by-layer AuNS/rGO(AuNS: Au nanosheets) films were studied under laser irradiation at 940 nm, and comparisons were made with the film of rGO or AuNSs where single type of photothermal effective species exist. The results indicate that the hybrid LbL AuNS/rGO films displayed enhanced photothermal effects compared with the rGO or AuNSs films. The photothermal performance of the hybrid AuNS/r GO films deteriorated over repeated use or long-term laser irradiation, but the ultimate performance after irradiation was still better than that of the rGO or AuNS films. The hybrid film was able to load model drug methylene blue(MB), and release MB 4times faster with NIR irradiation than without, suggesting potential application in the combined chemical and thermal therapies. Thus, the hybrid film of AuNS-rGO is recommended when short-term or few-cycle photothermal applications are required.In comparison, rGO multilayered film better suits long-term or repeated photothermal applications where stable photothermal performance are required. We expect the thesis enhance the potential application of rGO and AuNS as biomedical materials.