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Aggregation affects optical properties and photothermal heating of gold nanospheres.

Abstract：

:Laser heating of gold nanospheres (GNS) is increasingly prevalent in biomedical applications due to tunable optical properties that determine heating efficiency. Although many geometric parameters (i.e. size, morphology) can affect optical properties of individual GNS and their heating, no specific studies of how GNS aggregation affects heating have been carried out. We posit here that aggregation, which can occur within some biological systems, will significantly impact the optical and therefore heating properties of GNS. To address this, we employed discrete dipole approximation (DDA) simulations, Ultraviolet-Visible spectroscopy (UV-Vis) and laser calorimetry on GNS primary particles with diameters (5, 16, 30 nm) and their aggregates that contain 2 to 30 GNS particles. DDA shows that aggregation can reduce the extinction cross-section on a per particle basis by 17-28%. Experimental measurement by UV-Vis and laser calorimetry on aggregates also show up to a 25% reduction in extinction coefficient and significantly lower heating (~ 10%) compared to dispersed GNS. In addition, comparison of select aggregates shows even larger extinction cross section drops in sparse vs. dense aggregates. This work shows that GNS aggregation can change optical properties and reduce heating and provides a new framework for exploring this effect during laser heating of nanomaterial solutions.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang Y,Gao Z,Han Z,Liu Y,Yang H,Akkin T,Hogan CJ,Bischof JC

doi

10.1038/s41598-020-79393-w

subject

Has Abstract

pub_date

2021-01-13 00:00:00

pages

898

issue

1

issn

2045-2322

pii

10.1038/s41598-020-79393-w

journal_volume

11

pub_type

杂志文章

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