Determination of thermal and optical parameters of melanins by photopyroelectric spectroscopy

TitleDetermination of thermal and optical parameters of melanins by photopyroelectric spectroscopy
Publication TypeJournal Article
Year of Publication2005
Authorsde Albuquerque, J. E., Giacomantonio C., White A. G., and Meredith Paul
JournalApplied Physics Letters
Volume87
Issue6
Pagination-
AbstractPhotopyroelectric 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.
DOI10.1063/1.2009833