Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility

Kim, Seong Cheol; Hanawa, Takao; Manaka, Tomoyo; Tsuchiya, Hiroaki; Fujimoto, Shinji

doi:https://doi.org/10.1080/14686996.2022.2066960

Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility

Kim, Seong Cheol; Hanawa, Takao; Manaka, Tomoyo et al.

Science and Technology of Advanced Materials, 2022, 23(1), 322-331

アクセス数:783件（2025-07-27 07:50 集計）

固定URL: https://hdl.handle.net/11094/88666

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タイトル	Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility
著者	著者名 Kim, Seong Cheol
	NRID 1000090142736 1000090142736 著者名 Hanawa, Takao
	著者名 Manaka, Tomoyo
	NRID 1000050432513 1000050432513 ORCID 0000-0001-5619-0139 0000-0001-5619-0139 researchmap permalink read0076368 read0076368 Scopus Author ID 7202203364 7202203364 著者名 Tsuchiya, Hiroaki
	NRID 1000070199371 1000070199371 ORCID 0000-0002-7787-4190 0000-0002-7787-4190 researchmap permalink read0013980 read0013980 Scopus Author ID 57211614674 57211614674 著者名 Fujimoto, Shinji
キーワード等	band gap
	band structure
	biocompatibility
	Hanks’ solution
	passive film
	photocurrent
	saline
	Titanium
	XPS
抄録	The band structures and band gap energies, Eg, of passive films formed on titanium (Ti) in simulated bioliquids, Hanks’ solution (Hanks) and saline, were evaluated. Ti was polarized at 0, −0.1, and −0.2 VAg/AgCl, Ef, for 1 h. After polarization, the surfaces were characterized using X-ray photoelectron spectroscopy, and the photoelectrochemical responses were evaluated. The current change during photoirradiation was recorded as a photocurrent transient at each measuring potential, Em, and by changing the wavelength of the incident light. Passive films consisted of a very thin TiO2 layer containing small amounts of Ti2O3 and TiO, hydroxyl groups, and water. During polarization in Hanks, calcium and phosphate ions were incorporated or formed calcium phosphate but not in saline. Calcium phosphate and hydroxyl groups influenced the band structure. Eg was graded in Hanks but constant in saline, independent of Ef and Em. The passive film on Ti behaved as an n-type semiconductor containing two layers: an inner oxide layer with a large Eg and an outer hydroxide layer with a small Eg. In Hanks, Eg was 3.3–3.4 eV in the inner oxide layer and 2.9 eV in the outer hydroxide layer. In saline, Eg was 3.3 eV in the inner layer and 2.7 eV in the outer layer. Calcium phosphate and hydroxyl groups influenced the band structure of the passive film. The Eg of the outermost surface was smaller than that of TiO2 ceramics, which is probably one of the principles of the excellent biocompatibility of Ti among metals.
出版者	Taylor and Francis
収録物名	Science and Technology of Advanced Materials
巻(号)	23(1)
ページ	322-331
刊行年月	2022-05-06
言語	英語
ハンドルURL	https://hdl.handle.net/11094/88666
PISSN	14686996
eISSN	18785514
NCID	AA11539797
NCID	AA11561821
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1080/14686996.2022.2066960
関連情報 (isIdenticalTo)	PMID 35557510
アクセス権	open access
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Science and Technology of Advanced Materials. 2022, 23(1), p. 322-331
DC.title	Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility
DC.creator	Kim, Seong Cheol
	Hanawa, Takao
	Manaka, Tomoyo
	Tsuchiya, Hiroaki
	Fujimoto, Shinji
DC.publisher	Taylor and Francis
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2022-05-06
DC.identifier	https://doi.org/10.1080/14686996.2022.2066960
DC.subject	band gap
	band structure
	biocompatibility
	Hanks’ solution
	passive film
	photocurrent
	saline
	Titanium
	XPS
DCTERMS.abstract	The band structures and band gap energies, Eg, of passive films formed on titanium (Ti) in simulated bioliquids, Hanks’ solution (Hanks) and saline, were evaluated. Ti was polarized at 0, −0.1, and −0.2 VAg/AgCl, Ef, for 1 h. After polarization, the surfaces were characterized using X-ray photoelectron spectroscopy, and the photoelectrochemical responses were evaluated. The current change during photoirradiation was recorded as a photocurrent transient at each measuring potential, Em, and by changing the wavelength of the incident light. Passive films consisted of a very thin TiO2 layer containing small amounts of Ti2O3 and TiO, hydroxyl groups, and water. During polarization in Hanks, calcium and phosphate ions were incorporated or formed calcium phosphate but not in saline. Calcium phosphate and hydroxyl groups influenced the band structure. Eg was graded in Hanks but constant in saline, independent of Ef and Em. The passive film on Ti behaved as an n-type semiconductor containing two layers: an inner oxide layer with a large Eg and an outer hydroxide layer with a small Eg. In Hanks, Eg was 3.3–3.4 eV in the inner oxide layer and 2.9 eV in the outer hydroxide layer. In saline, Eg was 3.3 eV in the inner layer and 2.7 eV in the outer layer. Calcium phosphate and hydroxyl groups influenced the band structure of the passive film. The Eg of the outermost surface was smaller than that of TiO2 ceramics, which is probably one of the principles of the excellent biocompatibility of Ti among metals.
DC.format	88666
citation_title	Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility
citation_author	Kim, Seong Cheol
	Hanawa, Takao
	Manaka, Tomoyo
	Tsuchiya, Hiroaki
	Fujimoto, Shinji
citation_publisher	Taylor and Francis
citation_language	英語
citation_date	2022-05-06
citation_journal_title	Science and Technology of Advanced Materials
citation_volume	23
citation_issue	1
citation_firstpage	322
citation_lastpage	331
citation_doi	https://doi.org/10.1080/14686996.2022.2066960
citation_pmid	35557510
citation_public_url	https://hdl.handle.net/11094/88666

Band structures of passive films on titanium in simulated bioliquids determined by photoelectrochemical response: principle governing the biocompatibility

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