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Absorption and scattering cross-section extinction values of silver nanoparticles

机译：银纳米粒子的吸收散射截面消光值

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We determine the extinction values of silver nanoparticles as a function of their diameter for three different wavelengths (405 nm, 532 nm, and 671 nm) from the values of absorbance and their photo thermal lens response. We show that for particles of small diameters (<50 nm) the extinction grows as the cube of the diameter for all three wavelengths. For larger particles the extinction determined from absorbance exhibits a sixth order dependence on the diameters for 532 nm and 671 nm. This kind of behavior is typical of scattering processes that should dominate for large particles. For 405 nm the plasmonic resonant absorption dominates over scattering making difficult the observation of the sixth order dependence even for particles larger than 50 nm. The absorption cross-section measured by the photothermal method does not show the sixth order dependence. It depends on the cube of the particle's diameter for all nanoparticles confirming the scattering free character of this absorption technique and validating the results of the absorbance experiment. (C) 2016 Elsevier B.V. All rights reserved.
机译：我们从吸光度值及其光热透镜响应值中确定了三种不同波长（405 nm，532 nm和671 nm）下银纳米颗粒的消光值与其直径的关系。我们表明，对于小直径（<50 nm）的粒子，消光随着所有三个波长的直径的立方增长。对于较大的颗粒，由吸光度确定的消光表现出对532 nm和671 nm直径的六阶依赖性。这种行为是散射过程的典型表现，对于大颗粒，散射过程应占主导地位。对于405 nm，等离子体共振吸收在散射方面占主导地位，即使对于大于50 nm的颗粒，也很难观察到六阶相关性。通过光热法测量的吸收截面不显示六阶依赖性。对于所有纳米颗粒，这取决于颗粒直径的立方，从而确认了该吸收技术的无散射特性并验证了吸收实验的结果。 （C）2016 Elsevier B.V.保留所有权利。

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