Size, Shape, and Wavelength Effect on Photothermal Heat Elevation of Gold Nanoparticles: Absorption Coefficient Experimental Measurement,Particle & Particle Systems Characterization

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Size, Shape, and Wavelength Effect on Photothermal Heat Elevation of Gold Nanoparticles: Absorption Coefficient Experimental Measurement
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-11-12 , DOI: 10.1002/ppsc.202000255
Amadou Thierno Diallo ₁ , Malika Tlemçani ₁ , Memona Khan ₁ , Jolanda Spadavecchia ₁ , Nadia Djaker ₁

Affiliation

Complex‐shaped nanoparticles as gold nanourchins (GNU) and nanorods (GNR) are very suitable agents in the case of photothermal therapy due to their photon‐heat conversion ability in the red and near‐infrared region (NIR). The quantification in heat generation of complex shaped nanostructures is an important key to predict the therapeutic effect of these nanoparticles. For that, the determination of the nanoparticles absorption cross section (σ_Abs) responsible for the heat generation is one of the important steps before any application. Although it is obvious to determine σ_Abs for spheres via Mie's theory, in the case of complex structures like GNU or GNR, this parameter is difficult to model. In this work, a new methodology is used to determine experimentally σ_Abs for both GNU and GNR. Experimental measurements of the photothermal properties of 100 nm size GNU and two different sizes of GNRs are studied regarding different parameters such as concentration, laser excitation wavelength, and exposure time. By using the heat transfer theory, the temperature elevation in the nanoparticles solutions is converted to temperature elevation at the nanoparticles surface and σ_Abs values are then calculated for both GNU and GNR in the NIR spectral region.

中文翻译：

尺寸，形状和波长对金纳米粒子光热升高的影响：吸收系数实验测量

复杂形状的纳米粒子，例如金纳米顽皮（GNU）和纳米棒（GNR），由于在红色和近红外区域（NIR）具有光子热转换能力，因此非常适合光热疗法。复杂形状的纳米结构的热产生的量化是预测这些纳米颗粒的治疗效果的重要关键。为此，确定产生热量的纳米颗粒吸收截面（_σAbs）是任何应用之前的重要步骤之一。尽管通过Mie的理论确定球体的_σAbs很明显，但是在诸如GNU或GNR的复杂结构的情况下，很难对该参数进行建模。在这项工作中，使用了一种新的方法来通过实验确定_σAbs对于GNU和GNR。针对不同的参数（例如浓度，激光激发波长和曝光时间），研究了100 nm大小的GNU和两种不同大小的GNR的光热性能的实验测量。通过使用传热理论，在纳米颗粒溶液的温度升高是在纳米颗粒表面转变为温度升高和σ_阿布斯然后这些值在NIR光谱区中计算的两种GNU和GNR。

更新日期：2020-12-17

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