Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon

S. B. Lang; S. A.M. Tofail; A. A. Gandhi; M. Gregor; C. Wolf-Brandstetter; J. Kost; S. Bauer; M. Krause

doi:10.1109/ISE.2011.6084995

Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon

S. B. Lang, S. A.M. Tofail, A. A. Gandhi, M. Gregor, C. Wolf-Brandstetter, J. Kost, S. Bauer, M. Krause

Department of Chemical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

Tofail et al. ³ have found that the dipole of HA is the hydroxyl (OH) ion, which lies along the crystallographic c-axis within the tunnel formed by phosphate (PO ₄) tetrahedra. In adjacent tunnels, the OH ions could point in a parallel direction or in an anti-parallel one. We believe that the high-temperature calcination crystallized the HA film on silicon and converted most of the OH pairs to a parallel configuration. Thus the HA developed a domain structure with randomly oriented dipoles. Upon cooling, sufficient domains reoriented in polarity so as to result in a net polar structure. This is due to the crystalline character of the silicon substrate and texturing. The photocurrent is caused by the silicon alone.

Original language	English
Title of host publication	2011 - 14th International Symposium on Electrets, ISE 2011
Pages	87-88
Number of pages	2
DOIs	https://doi.org/10.1109/ISE.2011.6084995
State	Published - 1 Dec 2011
Event	2011 IEEE 14th International Symposium on Electrets, ISE 2011 - Montpellier, France Duration: 28 Aug 2011 → 31 Aug 2011

Publication series

Name	Proceedings - International Symposium on Electrets

Conference

Conference	2011 IEEE 14th International Symposium on Electrets, ISE 2011
Country/Territory	France
City	Montpellier
Period	28/08/11 → 31/08/11

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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10.1109/ISE.2011.6084995

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Lang, S. B., Tofail, S. A. M., Gandhi, A. A., Gregor, M., Wolf-Brandstetter, C., Kost, J., Bauer, S., & Krause, M. (2011). Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon. In 2011 - 14th International Symposium on Electrets, ISE 2011 (pp. 87-88). Article 6084995 (Proceedings - International Symposium on Electrets). https://doi.org/10.1109/ISE.2011.6084995

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title = "Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon",

abstract = "Tofail et al. 3 have found that the dipole of HA is the hydroxyl (OH) ion, which lies along the crystallographic c-axis within the tunnel formed by phosphate (PO 4) tetrahedra. In adjacent tunnels, the OH ions could point in a parallel direction or in an anti-parallel one. We believe that the high-temperature calcination crystallized the HA film on silicon and converted most of the OH pairs to a parallel configuration. Thus the HA developed a domain structure with randomly oriented dipoles. Upon cooling, sufficient domains reoriented in polarity so as to result in a net polar structure. This is due to the crystalline character of the silicon substrate and texturing. The photocurrent is caused by the silicon alone.",

author = "Lang, {S. B.} and Tofail, {S. A.M.} and Gandhi, {A. A.} and M. Gregor and C. Wolf-Brandstetter and J. Kost and S. Bauer and M. Krause",

year = "2011",

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doi = "10.1109/ISE.2011.6084995",

language = "English",

isbn = "9781457710230",

series = "Proceedings - International Symposium on Electrets",

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note = "2011 IEEE 14th International Symposium on Electrets, ISE 2011 ; Conference date: 28-08-2011 Through 31-08-2011",

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Lang, SB, Tofail, SAM, Gandhi, AA, Gregor, M, Wolf-Brandstetter, C, Kost, J, Bauer, S & Krause, M 2011, Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon. in 2011 - 14th International Symposium on Electrets, ISE 2011., 6084995, Proceedings - International Symposium on Electrets, pp. 87-88, 2011 IEEE 14th International Symposium on Electrets, ISE 2011, Montpellier, France, 28/08/11. https://doi.org/10.1109/ISE.2011.6084995

Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon. / Lang, S. B.; Tofail, S. A.M.; Gandhi, A. A. et al.
2011 - 14th International Symposium on Electrets, ISE 2011. 2011. p. 87-88 6084995 (Proceedings - International Symposium on Electrets).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Lang, S. B.

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AB - Tofail et al. 3 have found that the dipole of HA is the hydroxyl (OH) ion, which lies along the crystallographic c-axis within the tunnel formed by phosphate (PO 4) tetrahedra. In adjacent tunnels, the OH ions could point in a parallel direction or in an anti-parallel one. We believe that the high-temperature calcination crystallized the HA film on silicon and converted most of the OH pairs to a parallel configuration. Thus the HA developed a domain structure with randomly oriented dipoles. Upon cooling, sufficient domains reoriented in polarity so as to result in a net polar structure. This is due to the crystalline character of the silicon substrate and texturing. The photocurrent is caused by the silicon alone.

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Pyroelectric, piezoelectric and photoeffects in hydroxyapatite thin films on silicon

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