Open AccessEffect of acetone and methanol environment on the electrical properties of Fe doped hydroxyapatite
Author(s) -
Singh Brajendra,
Singh Priyanka,
Siddiqui Saiqua,
Rajput Parasmani,
Gupta Mukul
Publication year - 2021
Publication title -
international journal of ceramic engineering and science
Language(s) - English
Resource type - Journals
ISSN - 2578-3270
DOI - 10.1002/ces2.10084
Subject(s) - methanol , acetone , valence (chemistry) , adsorption , analytical chemistry (journal) , chemistry , xanes , doping , nuclear chemistry , inorganic chemistry , materials science , spectral line , chromatography , organic chemistry , physics , optoelectronics , astronomy
We report huge change in impedance of Fe doped hydroxyapatite Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 in presence of methanol and acetone environment while parent hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 shows only nominal change. Parent and Fe doped hydroxyapatite Ca 1−x Fe x (PO 4 ) 6 (OH) 2 (0 ≤ x ≤ 0.3) samples were prepared by wet chemical method. All the samples are found in single phase using X‐ray diffraction (XRD), and they are crystallized in hexagonal structure. Fe K‐edge X‐ray absorption near edge structure (XANES) spectra show the presence of mixed‐valence states (Fe 2+ and Fe 3+ ) in Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 sample while Fe is present in Fe 3+ valence state in Ca 9.7 Fe 0.3 (PO 4 ) 6 (OH) 2 sample. Fe doped composition Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 has shown the change in impedance (response) ~80% in presence of 50 ppm methanol concentration and ~238% for 500 ppm methanol concentration. Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 has shown ~92% response for 50 ppm acetone concentration and ~537% response for 500 ppm acetone concentration. Analysis of response (change in impedance) using Freundlich adsorption isotherm equation has shown the physical and chemical type of adsorption for methanol while only physical adsorption for acetone is found in Ca 9.9 Fe 0.1 (PO 4 ) 6 (OH) 2 .