Photothermal Conversion Properties Of Metal Nanoparticles Decorated Zinc Oxide Nanowire

Metal surface plasmons resonance has important applications in the fields of image sensing and biomedicine.Wide-band gap semiconductor nanowires are widely used in highpower devices and optoelectronic devices at high temperature and high frequency.They both can realize the concentration and enhancement of electric field.However,their resonance has limited effect on electric field amplification,resulting in low photothermal conversion efficiency.With the continuous development of micro-nano manufacturing technology,it is not difficult to control the shape,size and arrangement of synthetic nanowires.On this basis,we want to make full use of the heat generation from surface plasmonic resonance of the metal nanoparticles in this paper.The leaky mode resonance of Zn O nanowires was introduced to initially collect the sunlight,and then aluminum nanorods were placed on it for the absorption of resonance,so that the synergistic effect of the two effects produced a greatly enhanced local electric field.Based on this,a composite structure of Zn O nanowires decorated with aluminum nanorods was designed to achieve local temperature rise.Main contents of this paper are as follows:1.The finite-difference time-domain(FDTD)method was used to simulate the electric field and heat generation of nano-spheres,nano-chains and nanorods made of gold and aluminum,respectively.It was determined that the aluminum nanorods with a diameter of10 nm and a length of 140 nm show the best performance in the heat generation due to the plasmonic resonance effect in the air,and the temperature could reach 348 K.2.Taking zinc oxide nanowires of various shapes as the research objects,the electric field distribution of nanowires at different wavelengths was simulated when they were incident from different directions,and the incident direction where leaky mode resonance occurred and the strongest resonant position were confirmed.3.Zinc oxide nanowires and aluminum nanorods were combined in a certain form,and different arrangement forms were explored.The results show that the local electric field is magnified by 2000-3000 times and the local temperature rises to 457 K through the synergistic effect of the two effects.In this paper,we built a model that comprehensively utilizes the surface plasmons resonance effect of metal nanostructures and the leaky-mode resonance phenomenon of semiconductor nanowires.This model is expected to be used to realize disinfection and sterilization under solar irradiation...