Abstract
We investigated the plasmonic heating effect of noble metal nanoparticles in a water environment using the first-principles approach. In this approach, we have solved the heat transfer equation in the steady state to obtain the heat generation and temperature profile corresponding to two different types of metals. Metals exhibited a surface plasmon resonance property in which maximum absorption of light for smaller size nanoparticles is observed, which can be used to heat up the surrounding environment. Inspired by the same, we have simulated the absorption cross section of different sizes of a metal nanosphere and observed the threshold value of the radius below which absorption is dominant. The maximum absorption of light by the nanosphere produces a hotspot, which can be visualized in terms of the electric field distribution plot. This electric field distribution profile of silver and gold metal nanoparticles is computed under the resonance wavelength using the boundary element method The results thus obtained in terms of the optical cross section are compared with those of the numerical model to establish their veracity. These theoretical works aim to further develop the fundamental understanding of the heating mechanism of plasmonic geometries, which can be used in several applications.
Highlights
The advantages of heat generation in plasmonic nanoparticles induced by light absorption were highlighted in several studies; efforts to demonstrate new vistas of practical applications of the emerging subject of thermoplasmonics in numerous fields has been the subject of investigation by many researchers
We have addressed the issue of quantitatively solving the temperature distribution in illuminated nanostructures, using both semianalytical and boundary element method (BEM)-based numerical approaches
The boundary element method provides rigorous solutions of these equations but requires only surface rather than volume parameterization, resulting in a significant reduction in computation time compared to other techniques
Summary
The advantages of heat generation in plasmonic nanoparticles induced by light absorption were highlighted in several studies; efforts to demonstrate new vistas of practical applications of the emerging subject of thermoplasmonics in numerous fields has been the subject of investigation by many researchers. The thermoplasmonic effect of a metal nanoparticle (MNP) having a wide range of applications has been studied in the last two decades using semianalytical, numerical, and experimental approaches. This encompasses subject areas of nanotechnology, nanothermodynamics, and nano-optics They find potential applications in emerging fields of photothermal cancer therapy, drug delivery, materials science, nanofluidics, and phononics.. The heating of the nanoparticle gives rise to a variety of subsequent processes in the surrounding environment that include nanobubble formation, stress wave generation, enhancement of chemical reactions, microscale fluid convection, enhanced Brownian motion, liquid superheating (i.e., heating above the boiling point of a liquid without boiling), thermal radiation, microscale thermophoresis of colloids and biomolecules, and modification of the metabolism of living cells
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