Equivalent calculation and characterization of the thermoplasmonics effect of Au nanoparticle arrays
The thermoplasmonics effect of metal plasmon micro-nanostructures can be used as a controllable localized heat source at the nanoscale.Based on the finite element method,this paper used the wave optics and heat transfer module of COMSOL Multiphysics software to calculate the absorption cross section,average energy and temperature distribution of the Au nanoparticle two-dimensional array model.The results show that when the particle size is constant,the average energy of the model first increases and then decreases to become stable as the number of arrays increases.The larger the particle distance is,the larger the number of arrays corresponding to stable average energy is.When the Au nanoparticle two-dimensional array model is large enough,the average energy is not related to the particle distance,but only to the particle size.In order to calculate the localized heat generated by the two-dimensional array of Au nanoparticles,a heat dissipation model and an adiabatic model were innovatively constructed and equivalently processed.The 1000 ns relaxation time obtained in the heat dissipation model was substituted into the adiabatic model,and the transient temperature of localized heat was calculated to be nearly 82 K.The corresponding relationship between the photoanode surface with different temperature gradients and the oxygen production volume fraction of decomposed water is visually characterized.This further confirms that the thermoplasmonics effect of metal nanoparticles promotes the photoelectrode interface reaction.
Au nanoparticle arraythermoplasmonics effectlocalized heatheat dissipation modeladiabatic model
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