In Situ Photothermal Response of Single Gold Nanoparticles through Hyperspectral Imaging Anti-Stokes Thermometry
In Situ Photothermal Response of Single Gold Nanoparticles through Hyperspectral Imaging Anti-Stokes Thermometry
复制标题
金纳米颗粒的高光谱成像反斯托克斯测温原位光热响应
DOI：
10.1021/acsnano.0c06185
复制
发表时间：
2021-02-23
期刊：
影响因子：
17.1
通讯作者：
Stefani, Fernando D.
中科院分区：
文献类型：
--
作者：
Barella, Mariano;Violi, Ianina L.;Stefani, Fernando D.
几个应用领域需要一个可靠的表征的光热响应和散热的纳米系统，这仍然是一个具有挑战性的任务建模和实验测量。在这里，我们提出了一种实现反斯托克斯测温，使在原位光热表征单个纳米粒子（NP）从一个单一的高光谱光致发光共焦图像。该方法是无标记的，可能适用于任何NP与可检测的反斯托克斯发射，并且不需要任何先验信息的NP本身或周围的媒体。利用它，我们首先研究了玻璃衬底上不同尺寸的球形金纳米粒子的光热响应，浸泡在水中，发现热耗散主要是由大于50 nm的纳米粒子的水为主。然后，通过比较玻璃上的80 nm金纳米颗粒与蓝宝石和石墨烯（两种具有高热导率的材料）的光热响应来研究衬底的作用。对于给定的辐照度水平，与裸玻璃相比，蓝宝石上的纳米粒子达到的温度低18%，石墨烯上的纳米粒子达到的温度高24%。高导电材料如石墨烯的存在导致较差的热耗散的事实表明，界面热阻在纳米系统中起着非常重要的作用，并强调了原位实验测温技术的需要。所开发的方法将允许解决关于温度在等离子体辅助应用中的作用的几个开放性问题，特别是那些在复杂的矩阵和环境中存在任意形状的NP的应用。
Several fields of applications require a reliable characterization of the photothermal response and heat dissipation of nanoscopic systems, which remains a challenging task for both modeling and experimental measurements. Here, we present an implementation of anti-Stokes thermometry that enables the in situ photothermal characterization of individual nanoparticles (NPs) from a single hyperspectral photoluminescence confocal image. The method is label-free, potentially applicable to any NP with detectable anti-Stokes emission, and does not require any prior information about the NP itself or the surrounding media. With it, we first studied the photothermal response of spherical gold NPs of different sizes on glass substrates, immersed in water, and found that heat dissipation is mainly dominated by the water for NPs larger than 50 nm. Then, the role of the substrate was studied by comparing the photothermal response of 80 nm gold NPs on glass with sapphire and graphene, two materials with high thermal conductivity. For a given irradiance level, the NPs reach temperatures 18% lower on sapphire and 24% higher on graphene than on bare glass. The fact that the presence of a highly conductive material such as graphene leads to a poorer thermal dissipation demonstrates that interfacial thermal resistances play a very significant role in nanoscopic systems and emphasize the need for in situ experimental thermometry techniques. The developed method will allow addressing several open questions about the role of temperature in plasmon-assisted applications, especially ones where NPs of arbitrary shapes are present in complex matrixes and environments.