Light‐Driven Self‐Oscillation of Thermoplasmonic Nanocolloids

Mezzasalma, Stefano A.; Kruse, Joscha; Merkens, Stefan; Lopez, Eneko; Seifert, Andreas; Morandotti, Roberto; Grzelczak, Marek (2023) Light‐Driven Self‐Oscillation of Thermoplasmonic Nanocolloids. Advanced Materials, 35 (41). ISSN 0935-9648

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Abstract

Self‐oscillation—the periodic change of a system under a non‐periodic stimulus—is vital for creating low‐maintenance autonomous devices in soft robotics technologies. Soft composites of macroscopic dimensions are often doped with plasmonic nanoparticles to enhance energy dissipation and generate periodic response. However, while it is still unknown whether a dispersion of photonic nanocrystals may respond to light as a soft actuator, a dynamic analysis of nanocolloids self‐oscillating in a liquid is also lacking. This study presents a new self‐oscillator model for illuminated colloidal systems. It predicts that the surface temperature of thermoplasmonic nanoparticles and the number density of their clusters jointly oscillate at frequencies ranging from infrasonic to acoustic values. New experiments with spontaneously clustering gold nanorods, where the photothermal effect alters the interplay of light (stimulus) with the disperse system on a macroscopic scale, strongly support the theory. These findings enlarge the current view on self‐oscillation phenomena and anticipate the colloidal state of matter to be a suitable host for accommodating light‐propelled machineries. In broad terms, a complex system behavior is observed, which goes from periodic solutions (Hopf–Poincaré–Andronov bifurcation) to a new dynamic attractor driven by nanoparticle interactions, linking thermoplasmonics to nonlinearity and chaos.

Item Type:	Article
Uncontrolled Keywords:	Self-oscillation; nanocolloids; plasmonic nanoparticles; dynamic system; thermoplasmonic attractor
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Materials Physics
Depositing User:	Lorena Palameta
Date Deposited:	03 Dec 2024 15:36
URI:	http://fulir.irb.hr/id/eprint/9336
DOI:	10.1002/adma.202302987

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