Thermoelectric Power of Silver Telluride Thin Films and its Thermal Conductivity Applications

M. Prem Nawaz1, M. Palanivelu1, M. Karunanithy2,3, A. Afroos Banu1, A. Ayeshamariam3,* and K. Kaviyarasu4,5

1Department of Chemistry, Khadir Mohideen College, (Affiliated to Bharathidasan University), Adirampattinam-614701, India

2Department of Physics, SKPD Boys Higher Secondary School, Parrys, Chennai-600108, India

3Department of Physics, Khadir Mohideen College (Affiliated to Bharathidasan University), Adirampattinam-614701, India

4UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa

5Nanosciences African Network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa

*Corresponding author: E-mail: aamariam786@gmail.com

Abstract

The hydrothermal technique was used to create straight single crystal silver telluride nanowires with a diameter of around 200 nm and a length of up to micrometers of decades. There has been no template or surfactant used in the process. As-synthesized products are high purity and well-crystallized, confirmed by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectrum, transmission electron microscopy (TEM), and a high-resolution SAED pattern. Differential scanning calorimetry was used to observe the reversible structural phase shift from the low-temperature monoclinic structure to the high-temperature face-centered cubic structure. Furthermore, the dramatic drop in electrical current in a single nanowire at the phase transition temperature is revealed, paving the way for future research into the manufacturing of one-dimensional nanoscale devices. Silver telluride (Ag2Te) has large thermoelectric coefficients and it was tested by using resistor graph and calculated the values of it, thermal conductivity and Seebeck coefficient were discussed with respect to the temperature of thin films. Semiconductors were superior thermoelectric material due to higher ratio of electrical and thermal conductivities. Therefore, the AgTe thin films deposited on indium tin oxide (ITO) substrates were employed, thermoelectric power and thermal conductivity measurements, respectively.

Keywords

Thermal evaporation, Silver telluride, Thermal conductivity, Thermoelectric power.

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