Rapid controlled synthesis of gold-platinum nanorods with excellent photothermal properties under 808 nm excitation.
Rapid controlled synthesis of gold-platinum nanorods with excellent photothermal properties under 808 nm excitation.
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DOI：
10.3762/bjnano.12.37
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发表时间：
2021
影响因子：
3.1
通讯作者：
Sang S
中科院分区：
文献类型：
--
作者：
Wang J;Duan Q;Yang M;Zhang B;Guo L;Li P;Zhang W;Sang S
贵金属纳米材料由于具有局部表面等离子体共振(LSPR)效应，特别适合作为光热转换剂(PTA)，具有较高的光热转换效率(PCE)。对具有LSPR效应的金-铂(Au-Pt)双金属纳米粒子的研究为合成性能优良的PTA提供了新思路。但目前还没有一种简单、可扩展的方法来控制合成LSPR波长范围可调的Au-Pt纳米粒子。本文研究了Ag+和K2PtCl4对铂在金纳米棒表面沉积的影响。提出了一种在温和条件下快速、精确、可控地合成哑铃状铂包覆AuNRs(Au@PtNRs)的方法。合成的Au@PtNRS的纵向LSPR波长为812 nm，与普通激光波长808 nm非常接近。Au@PtNRS在激光照射下表现出优异的光热性能。辐照10min后，温度升高超过36℃，PCE约为78.77%，远高于AuNRs(57.33%)。此外，即使经过四次开/关循环，Au@PtNRs仍然能够保持其光热性质和光学性质，这表明它们具有良好的光热稳定性和可重用性。
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.
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