Abstract
Noble metal nanomaterials are particularly suitable as photothermal transduction agents (PTAs) with high photothermal conversion efficiency (PCE) due to local surface plasmon resonance (LSPR). Studies on different gold–platinum (Au–Pt) bimetal nanoparticles exhibiting the LSPR effect have provided a new idea for the synthesis of excellent PTAs. But there is no simple and scalable method for the controllable synthesis of Au–Pt nanoparticles with adjustable LSPR wavelength range. In this work, the effects of Ag+ and K2PtCl4 on the deposition of Pt on the surface of gold nanorods (AuNRs) were investigated. A fast, precise, and controlled synthesis of dumbbell-like Pt-coated AuNRs (Au@Pt NRs) under mild conditions is proposed. The synthesized Au@Pt NRs have a longitudinal LSPR wavelength of 812 nm, which is very close to a common laser wavelength of 808 nm. The Au@Pt NRs exhibit excellent photothermal properties when irradiated with a laser. The temperature increased by more than 36 °C after irradiation for 10 min, with a PCE of about 78.77%, which is much higher than that of AuNRs (57.33%). In addition, even after four on/off cycles, the Au@Pt NRs are able to maintain the photothermal properties and retain their optical properties, indicating that they have excellent photothermal stability and reusability.
Highlights
On the surface of noble metal nanoparticles, when the wavelength of incident light resonates with the light absorption wavelength of the nanoparticles, a significant part of the photon energy is absorbed through local surface plasmon resonance (LSPR) [1,2]
We report a simple method for preparing dumbbell-like Au@Pt NRs under mild conditions
By controlling the concentration of Ag+ and K2PtCl4 in the reaction solution, Au@Pt NRs were synthesized with different morphology and longitudinal LSPR peaks within a specific small range
Summary
On the surface of noble metal nanoparticles, when the wavelength of incident light resonates with the light absorption wavelength of the nanoparticles, a significant part of the photon energy is absorbed through LSPR [1,2]. Pt, and other noble metal nanoparticles all exhibit an obvious LSPR effect and strong spectral absorption in the UV–vis range. These nanoparticles can be applied as excellent PTAs. The PCE of PTAs is directly related to the light absorption capacity. The PCE of PTAs is directly related to the light absorption capacity For plasmon nanoparticles, their absorption will be significantly enhanced when the illumination laser wavelength is equal to their LSPR wavelength. Regulating the microstructure of nanomaterials is an effective means to control the LSPR wavelength
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