Long-range Plasmonic Photocatalysis Based On Rare Earth Ion-doped Light-emitting Waveguides

Plasmon photocatalysis has achieved many kinds of chemical reactions that are difficult to occur in traditional photocatalysis as a new class of photocatalysis,and it has milder conditions and more selective reactions than traditional photocatalysis.The metal structure and molecules are irradiated by the excitation light directly in situ plasmon photocatalysis,so that the molecular structure and absorption abilities will be destroyed by the strong light,causing irreversible consequences.The remote plasmon photocatalysis based on plasmon waveguides of Ag nanowires can solve the problem of in-situ excitation,but it has lower transmission efficiency and is more difficult to control.Besides,it is still impossible to avoid the influence of the metal structure's thermal effect on the molecules.The new system can provide an ideal system for applications in cell image,medical detection and treatment,because it has advantages of near-infrared remote excitation,high efficiency,low biological toxicity,easily tunable transmission and emission modes,and high stability of physical and chemical.The main research contents included as follow:1.A tunable remote plasmon photocatalytic system based on the rare-earth doped micro-waveguide with the beveled ends was designed and prepared.Using the near-infrared light to excite the beveled ends of microtubes,the large-area remote plasmon photocatalysis could be achieved because NIR excitation light could be coupled into microtubes and transmit along the microtubes.Besides,the physical mechanism of the remote excitation photocatalysis of the new system was investigated in detail,and the vibration mode of the target molecules was analyzed compared with density functional theory calculation.A novel tunable remote plasmon photocatalytic system based on rare-earth doped micro-waveguides with high efficiency was successfully established.2.The microscale precise regulation of remote fixed-site catalysis was achieved by changing the excitation site,using Raman spectroscopy to monitor the molecular,catalytic phenomenon in different sites of the microtubes.The regulation rules of remote catalysis of the new system at the micrometer scale in the excitation mode of the beveled ends was studied systematically.