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

Mene, Ravindra U.; Mahabole, Megha P.; Mohite, K. C.; Khairnar, Rajendra S.

doi:10.1016/j.materresbull.2013.10.040

Cited by 36 publications

(14 citation statements)

References 43 publications

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“…The transfer occurs through an OHion interacting with the double bonded oxygen of -PO 4 groups, because the distance between two adjacent OHions is too large (0.344nm) 32 . Some studies have tried to improve the gas sensing property of HA by swift heavy ion irradiations and doping of Si, Fe and Co [37][38][39][40] , but the enhancement is relatively limited. The nanocrystalline and porous nature of HA powder play a vital role for adsorption of a large number of chemical gases 35,36 .…”

Section: Introductionmentioning

confidence: 99%

Facile and controllable synthesis of hydroxyapatite/graphene hybrid materials with enhanced sensing performance towards ammonia

Zhang

Liu

Zhang

et al. 2015

Analyst

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In this work, needle-like and micro-spherical agglomerates of nanocrystalline hydroxyapatite (HA) were successfully assembled on the surface of graphene sheets with the aid of dopamine having two roles, as a template and a reductant for graphite oxide during the process of self-polymerization. The crystalline structure and micromorphology of HA can be conveniently regulated by controlling the mineralization route either with a precipitation (cHA/GR) or biomimetic methodology (bHA/GR). Both the composites exhibit improvements of ∼150% and ∼250% in sensitivity towards the sensing of ammonia at room temperature, compared with that of bare graphene. The combination of the multi-adsorption capability of HA and the electric conductivity of graphene is proposed to be the major reason for the observed enhancements. Gas sensing tests demonstrated that the HA/GR composites exhibit excellent selectivity, high sensitivity and repeatable stability towards the analytical sensing of ammonia.

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Section: Introductionmentioning

confidence: 99%

Facile and controllable synthesis of hydroxyapatite/graphene hybrid materials with enhanced sensing performance towards ammonia

Zhang

Liu

Zhang

et al. 2015

Analyst

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“…It is also having toxicity effects in breathing if its quantity exceeded in environment. Sensing of methanol, ethanol, acetone, and ammonia is reported in literature by HAP and measured by electrical properties 11‐15 . Sensing of 1000 ppm CO and CO 2 gases using Fe doped HAp thick films have been reported by Mene et al with 91% and 112% response at temperature 140°C and 155°C, respectively 10 .…”

Section: Introductionmentioning

confidence: 99%

“…However, these properties are dominated by the presence of protons and vacancies in hydroxyapatite lattice, and type of atoms in gas. Hydroxyapatite composites and thin films have been explored by various researchers for its sensing capabilities in the presence of volatile organic compounds (VOCs) by impedance and conductivity 11‐16 . Acetone is a very common volatile organic compound.…”

Section: Introductionmentioning

confidence: 99%

“…Hydroxyapatite composites and thin films have been explored by various researchers for its sensing capabilities in the presence of volatile organic compounds (VOCs) by impedance and conductivity. [11][12][13][14][15][16] Acetone is a very common volatile organic compound. It is used as primary chemical in various laboratory works and pharmaceuticals industries.…”

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confidence: 99%

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Effect of acetone and methanol environment on the electrical properties of Fe doped hydroxyapatite

Singh

Siddiqui

et al. 2021

Int J Ceramic Engine & Sci

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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 shows 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) Accepted Article This article is protected by copyright. All rights reserved 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 .

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“…[3,4] Different strategies like microstructural engineering [5] and single valence ion doping [6] were applied to enhance conductivity of hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement

Lukić¹,

Jovalekić²,

Marković³

et al. 2015

Materials Research Bulletin

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

Cited by 36 publications

References 43 publications

Facile and controllable synthesis of hydroxyapatite/graphene hybrid materials with enhanced sensing performance towards ammonia

Facile and controllable synthesis of hydroxyapatite/graphene hybrid materials with enhanced sensing performance towards ammonia

Effect of acetone and methanol environment on the electrical properties of Fe doped hydroxyapatite

Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement

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