Study of thermal parameters’ temperature dependence in solids using photothermal radiometry

Abstract

A photothermal radiometry configuration that allows the measurement of the temperature dependence of thermal parameters of solid materials is described. Two procedures are proposed. The first one is based on a combination of phase and amplitude signal data collected at a single frequency and the second one makes use of the information contained in the phase signal data, obtained at two different chopping frequencies. The methods are recommended for calorimetric studies requiring temperature scans at a constant chopping frequency.

Photothermal Techniques in Material Characterization

“…(12)- (14) as well as eqs. (15) and (16). As result the rate constants of adsorption k a , desorption k d where extracted.…”

“…As a result photothermal techniques allow the determination of optical, electronic as well as thermophysical properties of materials even in cases of efficient light scattering materials, which prohibit their characterization through conventional optical techniques. Photothermal radiometry has been used to characterize a variety of materials and thin films ranging from semiconducting films [11,12,14] to nanotube/nanoparticle composites [15,16] and biomaterials [17]. The PTR experimental setup (shown in Figure 2) consists of an excitation laser source (DPSS laser emitting at 512 nm), an a acousto-optic cell that chops periodically the laser intensity, an MCT (Mercury, Cadmium-Telluride) detector with detection in the 2 μm-12 μm wavelength range, a preamplifier, a phase sensitive detection system (lock in amplifier) and a couple of off axis Ag coated paraboloid mirrors to gather and collimate the black body radiation emitted from the excited sample in the sensitive detector area.…”

Optimization of thermoelectric parameters for quantum dot-assisted polymer nanocomposite

“…The thermal conductivity of the samples was determined by photothermal infrared radiometry or photothermal radiometry (PTR). 11,12 The schematic diagram is shown in Fig. 1.…”

Parametric study of the frequency-domain thermoreflectance technique

“…Photothermal techniques include photothermal displacement, 7 photothermal beam deflection (or "mirage"), 8 photothermal radiometry (PTR), 9 and photothermal reflectance (or thermoreflectance). [10][11][12][13] Thermoreflectance techniques may be distinguished as one of the two measurement types: time-domain and frequencydomain measurements.…”