AI Article Synopsis
- Noble metal nanoparticles (NPs), specifically 20 nm silver NPs, can generate heat and create temperature gradients when bound to a thin gold film, acting as both heat sources and optical sensors.
- These temperature gradients produce thermophoretic forces that can manipulate the position of the NPs, affecting their equilibrium and leading to observable changes in their scattering signals.
- Experimental results show a consistent decrease in the scattering signal of the NPs, indicating they are being drawn closer to the film due to the attractive forces generated by the temperature gradient, with power densities applied ranging from 1.40 to 4.80 kW/cm.
Article Abstract
Noble metal nanoparticles (NPs) represent nanoscale, optically addressable heat sources whose temperature gradients give rise to thermophoretic forces that can act back on the NPs. Herein we investigate 20 nm Ag NPs bound via molecular tethers to a 20 nm thin Au film as nanoplasmonic actuators that generate a local temperature gradient and simultaneously act as optical sensors of forces that induce their displacement from their equilibrium position. Forces of sufficient magnitude to affect the NP-film distance modulate the interferometric scattering (iSCAT) signal of the individual NPs and become detectable due to the distance-dependent damping of the NP scattering in the vicinity of the metal film. With total incident power densities within a range between 1.40 and 4.80 kW cm, the experiments reveal a continuous decay in the NP iSCAT signal, consistent with a decrease in the NP-film separation due to an attractive thermophoretic force.
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