Effective thermal conductivity of CdS/ZnS nanoparticles embedded polystyrene nanocomposites
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ORIGINAL
Effective thermal conductivity of CdS/ZnS nanoparticles embedded polystyrene nanocomposites S. Agarwal • D. Patidar • N. S. Saxena
Received: 26 June 2012 / Accepted: 9 March 2013 / Published online: 19 March 2013 Springer-Verlag Berlin Heidelberg 2013
Abstract CdS/PS and ZnS/PS nanocomposites have been prepared by solution casting method with different wt% of cadmium sulphide (CdS) and zinc sulphide (ZnS) nanoparticles and characterized through X-ray diffraction and transmission electron microscope measurements. The effective thermal conductivity of polymer nanocomposites has been measured by transient plane source method over the temperature range from room to 150 C. The experimental results showed that the thermal conductivity has been found to increase up to 4 wt% of CdS/ZnS nanoparticles and then decrease for 6 and 8 wt% of nanoparticles.
1 Introduction In the past few years, the studies of composite of polymer—inorganic nanoparticles materials have drawn enormous attention in the field of nonmaterials because they show a variety of applications in the fields of optics, electronics, magnetics, and biology [1–4] with unique mechanical, photoelectric and thermal properties. They combine the advantages of both inorganic materials (rigidity, high thermal stability) and organic polymers
S. Agarwal (&) D. Patidar N. S. Saxena Semi-conductor and Polymer Science Laboratory, Department of Physics, University of Rajasthan, Jaipur 302004, India e-mail: [email protected]; [email protected] S. Agarwal Department of Applied Science, Krishna Institute of Engineering and Technology, Ghaziabad 201206, India
(flexibility, dielectric, ductility and processability) [5–7]. Due to the interesting properties of chalcogenide nonmaterials, many works on the chalcogenide/polymer nanocomposites have been reported [8–10]. Among them, cadmium sulphide (CdS) and zinc sulphide (ZnS) are the most assuring compound materials because of their wide range of applications in optoelectronic [11], piezoelectronic [12] and semiconducting devices [13]. Thermal stability of CdS (ZnS)/polymer nanocomposites is a key importance aspect from the application point of view. Polymers generally have the low stability which restrain them from applications in higher temperature region. Thermal stability of polymer can also be improved by the dispersion of CdS and ZnS nanoparticles. Kuljanin et al. [14] have reported the influence of CdS-filler particles in the micrometer size range on the thermal stability of polystyrene (PS) matrix. Improvement of the thermal stability of the PS matrix for about 50 K was found in the presence of the CdS-filler. The thermal stability of nanocomposites ZnS/PS with various compositions (0, 5, 10, 15 and 20 wt% ZnS) has been investigated by Jakovljevic et al. [15] using nonisothermal thermogravimetric analysis with different temperature programs. Improvement of the thermal stability of the PS in composites with respect to the pure PS matrix is demonstrated for all compositions. The thermogravimetri
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