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Title: Improved gas sensing and dielectric properties of Fe doped hydroxyapatite thick films: Effect of molar concentrations

Highlights: • We report improved gas sensing and dielectric characteristics of Fe ion exchanged HAp films. • Fe doped HAp film shows maximum gas response at relatively lower temperature. • Response and gas uptake capacity of sensors is improved for appropriate amount of Fe ions in HAp matrix. • Fe-HAp films exhibit remarkable improvement in dielectric properties compared to pure HAp. • Fe doped HAp films show significant improvement in gas sensing as well as in dielectric properties. - Abstract: In the present work Fe doped hydroxyapatite (Fe-HAp) thick films has been successfully utilized to improve the gas sensing as well as its dielectric properties. Initially, HAp nano powder is synthesized by chemical precipitation process and later on Fe ions are doped in HAp by ion exchange process. Structural and morphological modifications are observed by means of X-ray diffraction and scanning electron microscopy analysis. The sensing parameters such as operating temperature, response/recovery time and gas uptake capacity are experimentally determined. The Fe-HAp (0.05 M) film shows improved CO and CO{sub 2} gas sensing capacity at lower operating temperature compared to pure HAp. Moreover, variation of dielectric constant and dielectric loss for pure and Fe-HAp thick films are studied as amore » function of frequency in the range of 10 Hz–1 MHz. The study reveals that Fe doped HAp thick films improve the sensing and dielectric characteristics as compared to pure HAp.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3]
  1. PDEA's, Annasaheb Waghire College of Science, Arts and Commerce, Otur 412409, M.S. (India)
  2. (India)
  3. School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, M.S. (India)
  4. Haribhai. V. Desai College, Pune 411002, M.S. (India)
Publication Date:
OSTI Identifier:
22345215
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 50; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; APATITES; CARBON DIOXIDE; CARBON MONOXIDE; DOPED MATERIALS; FILMS; FREQUENCY DEPENDENCE; IRON IONS; PERMITTIVITY; POWDERS; PRECIPITATION; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; X-RAY DIFFRACTION