- Conference date: 20–23 September 2007
- Location: Kollam (Kerala)
Pure polypyrrole sample was synthesized by chemical oxidation method using NaOH as reducing agent in aqueous HCl medium. The polypyrrole pellet sample was then annealed at 200 °C for 4 hrs. The amorphous nature of both annealed and as‐ prepared polypyrrole samples was confirmed by XRD. FTIR spectra of both samples were taken, which indicate the significant change in annealed sample compared to as prepared sample. Temperature dependence of effective thermal conductivity of both samples ( ) was studied by Transient plane source (TPS) technique. The effective thermal conductivity obtained for & exhibits a variation with temperature and a peak was observed for the two samples at 150 °C & 120 °C with a value 0.17 W/mK & 0.18 W/mK respectively. The shift of thermal conductivity peak of annealed sample towards the lower temperature side is explained on the basis of removal of voids and defects on annealing. The absorption spectra of these samples were recorded by USB‐2000 spectrophotometer at room temperature in the wavelength range 300–800 nm. From the analysis of absorption spectra, optical band gap of & were determined. It was found that the values of optical band gap for sample & are 2.39 eV&2.24 eV respectively.
- Thermal conductivity
- Absorption spectra
- Photonic bandgap materials
- Fourier transform infrared spectroscopy
Daniel Baumann, Mark G. Jackson, Peter Adshead, Alexandre Amblard, Amjad Ashoorioon, Nicola Bartolo, Rachel Bean, Maria Beltrán, Francesco de Bernardis, Simeon Bird, Xingang Chen, Daniel J. H. Chung, Loris Colombo, Asantha Cooray, Paolo Creminelli, Scott Dodelson, Joanna Dunkley, Cora Dvorkin, Richard Easther, Fabio Finelli, Raphael Flauger, Mark P. Hertzberg, Katherine Jones‐Smith, Shamit Kachru, Kenji Kadota, Justin Khoury, William H. Kinney, Eiichiro Komatsu, Lawrence M. Krauss, Julien Lesgourgues, Andrew Liddle, Michele Liguori, Eugene Lim, Andrei Linde, Sabino Matarrese, Harsh Mathur, Liam McAllister, Alessandro Melchiorri, Alberto Nicolis, Luca Pagano, Hiranya V. Peiris, Marco Peloso, Levon Pogosian, Elena Pierpaoli, Antonio Riotto, Uroš Seljak, Leonardo Senatore, Sarah Shandera, Eva Silverstein, Tristan Smith, Pascal Vaudrevange, Licia Verde, Ben Wandelt, David Wands, Scott Watson, Mark Wyman, Amit Yadav, Wessel Valkenburg and Matias Zaldarriaga
Data & Media loading...
Article metrics loading...