Determination of thermal and optical parameters of melanins by photopyroelectric spectroscopy
Determination of thermal and optical parameters of melanins by photopyroelectric spectroscopy
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DOI：
10.1063/1.2009833
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发表时间：
2005-08-08
影响因子：
4
通讯作者：
Meredith, P
中科院分区：
文献类型：
--
作者：
de Albuquerque, JE;Giacomantonio, C;Meredith, P
利用光致热电光谱（PPE）研究了黑色素的热性质和光学性质。对于PPE光谱的饱和部分中的给定波长，作为波长和斩波频率的函数独立地测量热电强度信号及其相位。PPE信号的强度和相位的方程用于拟合实验结果。从这些拟合中，我们第一次获得了样品的热扩散系数、热导率和比热，以及凝聚相光学带隙的值，我们发现该值为1.70 eV。(c)2005年美国物理学会。
Photopyroelectric spectroscopy (PPE) was used to study the thermal and optical properties of melanins. The photopyroelectric intensity signal and its phase were independently measured as a function of wavelength and chopping frequency for a given wavelength in the saturation part of the PPE spectrum. Equations for both the intensity and the phase of the PPE signal were used to fit the experimental results. From these fits we obtained for the first time, with great accuracy, the thermal diffusivity coefficient, the thermal conductivity, and the specific heat of the samples, as well as a value for the condensed phase optical gap, which we found to be 1.70 eV. (c) 2005 American Institute of Physics.