Study On Phototermal Conversion And Fe²⁺ Assisted Catalytic Enhancement Effect Of Gold Nanorods

The metal nanomaterials have important application value in electronics,biology,sensing,catalysis and information storage because of their tunable plasma resonance absorption characteristics?SPR?.Currently gold nanorods?Au NRs?are currently widely concerned with multifunctional metallic materials with transverse and longitudinal two plasma resonance absorption peaks.The resonant absorption peak can be modulated to reach the near infrared absorption region by changing the aspect ratio of the Au NRs.The near infrared region is the ideal optical window for biological applications,so the Au NRs in this window show that the physical properties of the photothermal conversion effect are studied extensively in Au NRs imaging,photothermal therapy,and photothermal controlled drug release.However,the influence factors of thermal conversion efficiency of Au NRs and how to improve the efficiency of photothermal conversion are important factors.The study of the effect of the thermal and light conversion efficiency and the structural changes of Au NRs and the modification of surface ligands is of great significance for further application.At the same time,both ends of the Au NRs have high redox potential,which shows a strong catalytic effect.The catalytic reaction can be realized by using the catalytic properties of Au NRs.The catalytic activity of Au NRs is directly related to the active sites.In view of the current application of Au NRs in drug loading,it is necessary to perform complex inorganic and organic surface coating.It is a new way to study how to realize the formation of a friendly coating material?dextran?by the formation of high activity Au NRs to the biological small molecules?such as glucose?.In summary,this paper focuses on the photothermal conversion efficiency of Au NRs and the catalytic effect of Au NRs based on photothermal treatment.The main work of this thesis is divided into two parts as follows:?1?Au NRs with uniform size were prepared by seed growth method.The effects of these factors on the growth of Au NRs were investigated by controlling AgNO3,AA and reaction time.The Au NRs were modified by poly?sodium-styrenesulfonate??PSS?,and the Au NRs with different potentials were obtained.The results show that PSS can affect the stability of the Au NRs.?2?The effects of the longitudinal plasmon absorption of the Au NRs and the frequency conversion of the light source on the thermal conversion efficiency were studied by using different laser sources?633,808,980nm?.The changes of the photo thermal conversion efficiency caused by the surface position of the Au NRs were studied by using the PSS technique.?3?The catalytic activity of Au NRs is directly related to the active sites.The aspect ratio of Au NRs and the catalytic activity of Au NRs were measured by hydrogen peroxide?H₂O₂?.The effects of H₂O₂ concentration and different ions on the structure and the optical properties of Au NRs were investigated.The Au NRs were used to catalyze the formation of dextran.