Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 5, Pages 5330-5339Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c00668
Keywords
nanoaggregates; on-demand disinfection; Ag; nanosilver; near-IR
Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (ERC) [758705]
- Karolinska Institutet Faculty Board
- Swedish Research Council [2016-03471, 2016-05113]
- Torsten Soderberg Foundation [M87/18]
- Swedish Foundation for Strategic Research [FFL18-0043]
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This study developed plasmonic nanoaggregates with tunable extinction by single-step aerosol self-assembly and successfully prepared plasmonic photothermal nanocomposite films. The photothermal properties of these films were utilized to eradicate biofilms of clinically relevant bacteria.
Plasmonic nanoparticles with near-IR (NIR) light absorption are highly attractive in biomedicine for minimally invasive photothermal treatments. However, these optical properties are typically exhibited by plasmonic nanostructures with complex, nonspherical geometries that may prohibit their broad commercialization and further integration into photothermal devices. Herein, we present the single-step aerosol self-assembly of plasmonic nanoaggregates that consisted of spherical silver nanoparticles with tunable extinction from visible to NIR wavelengths. This tunable extinction was achieved by the addition of SiO2 during the flame synthesis of the nanoparticles, which acted as a dielectric spacer between the spherical silver nanoparticles and was also computationally validated by simulating the extinction spectra of similar silver nanoaggregates. These plasmonic nanoaggregates were easily deposited on silicone polymeric surfaces and further encased with a top polymer layer, forming plasmonic photothermal nanocomposite films. The photothermal properties of the NIR nanocomposite films were utilized to eradicate the established biofilms of clinically relevant Escherichia coli and Staphylococcus aureus, with a relationship observed between the final surface temperature and biofilm eradication.
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