Abstract
Localized surface plasmon resonances (LSPRs) in heavily doped copper chalcogenides are unique because LSPR energy can be adjusted by adjusting doping or stoichiometry. However, there are few investigations on the LSPRs of bimetal copper-based chalcogenides. Herein, bimetal Cu5FeS4 (CFS) nanoparticles were synthesized by a facile hot injection of a molecular precursor. The tunable plasmon resonance absorption of CFS nanoparticles is achieved by the decrease of the ratio of copper to iron and the treatment of n-dodecylphosphoric acid (DDPA). After surface modification with polyethylene glycol (PEG), the CFS nanoparticles with a plasmon resonance absorption peak at 764 nm can serve as promising photothermal agents, showing good biocompatibility and excellent photothermal performance with a photothermal conversion efficiency of up to 50.5%, and are thus used for photothermal therapy of cancers under the irradiation of an 808-nm laser. Our work provides insight into bimetal copper-based chalcogenides to achieve tunable LSPRs, which opens up the possibility of rationally designing plasmonic bimetal copper-based chalcogenides.
Highlights
Localized surface plasmon resonances (LSPRs) of nanostructures contribute to enhanced tunable optical absorption in the near-infrared (NIR) region, which is great for the improvement of the photothermal performance of photothermal nanoagents (Luther et al, 2011; Manthiram and Alivisatos, 2012; Yang et al, 2013; Li et al, 2015)
The molecular precursors were obtained by reacting CuCl2·2H2O as well as a certain molar ratio of FeCl3·6H2O with sodium diethyldithiocarbamate (SDEDTC)
Motivated by the excellent photothermal performance of CFS nanoparticles, we evaluated the potential of these nanoparticles as photothermal agents
Summary
Localized surface plasmon resonances (LSPRs) of nanostructures contribute to enhanced tunable optical absorption in the near-infrared (NIR) region, which is great for the improvement of the photothermal performance of photothermal nanoagents (Luther et al, 2011; Manthiram and Alivisatos, 2012; Yang et al, 2013; Li et al, 2015). There are reports of LSPRs in doped semiconductor nanostructures, including copper chalcogenides (Liu et al, 2013; Balitskii et al, 2014), tin oxides (Kanehara et al, 2009; Garcia et al, 2011), and zinc oxide (Buonsanti et al, 2011). There have been a few reports on copper chalcogenides with enhanced photothermal performance by adjusting doping for photothermal therapy of cancers (Hessel et al, 2011; Tian et al, 2013; Li et al, 2014a, 2015). As the plasmon resonance absorption of gold nanostructures is much higher than the inter-band absorption of organic materials, the photothermal conversion efficiency of gold nanostructures is one of the currently reported high photothermal conversion
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