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Mechanochemical preparation of 8 - hydroxyquinoline / hydroxyapatite hybrid nanocrystals and their photofunctional interfaces / Motohiro Tagaya in Industrial & engineering chemistry research, Vol. 51 N° 34 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11294-11300 Titre : Mechanochemical preparation of 8 - hydroxyquinoline / hydroxyapatite hybrid nanocrystals and their photofunctional interfaces Type de document : texte imprimé Auteurs : Motohiro Tagaya, Auteur ; Satoshi Motozuka, Auteur ; Takaomi Kobayashi, Auteur Année de publication : 2012 Article en page(s) : pp. 11294-11300 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanocrystal  Hydroxyapatite  Preparation Résumé : Hybrid nanoaystals of 8-hydroxyquinoline (8Hq) molecules and hydroxyapatite nanocrystals (HAp) were successfully prepared by a mechanochemical solid-state reaction. The hybrid nanocrystals exhibit a significant thermal stability and efficient photoluminescence peak at 500 nm, which were attributed to metal―ligand charge transfer at the interface between the oxygen atoms of 8Hq and the calcium ions of HAp, and the interfacial photofunctions were inechanochemically controlled. The interfacial bonding structures were also supported by a DV-Xa molecular orbital calculation. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299457 [article] Mechanochemical preparation of 8 - hydroxyquinoline / hydroxyapatite hybrid nanocrystals and their photofunctional interfaces [texte imprimé] / Motohiro Tagaya, Auteur ; Satoshi Motozuka, Auteur ; Takaomi Kobayashi, Auteur . - 2012 . - pp. 11294-11300. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 34 (Août 2012) . - pp. 11294-11300 Mots-clés : Nanocrystal  Hydroxyapatite  Preparation Résumé : Hybrid nanoaystals of 8-hydroxyquinoline (8Hq) molecules and hydroxyapatite nanocrystals (HAp) were successfully prepared by a mechanochemical solid-state reaction. The hybrid nanocrystals exhibit a significant thermal stability and efficient photoluminescence peak at 500 nm, which were attributed to metal―ligand charge transfer at the interface between the oxygen atoms of 8Hq and the calcium ions of HAp, and the interfacial photofunctions were inechanochemically controlled. The interfacial bonding structures were also supported by a DV-Xa molecular orbital calculation. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26299457

Photoassisted fusion behavior of decanethiol-passivated gold nanoparticles by vacuum ultraviolet light exposure / Motohiro Tagaya in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7398-7402 Titre : Photoassisted fusion behavior of decanethiol-passivated gold nanoparticles by vacuum ultraviolet light exposure Type de document : texte imprimé Auteurs : Motohiro Tagaya, Auteur ; Masaru Nakagawa, Auteur Année de publication : 2011 Article en page(s) : pp. 7398-7402 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticle Résumé : The photoassisted fusion of a decanethiol-passivated Au-nanoparticle film on a glass substrate by exposure to vacuum-ultraviolet (vacuum-UV) light at 172 nm was investigated and compared to that by thermal fusion. On the basis of the thermal treatment at 200 °C, the X-ray diffraction patterns indicated that the Au-nanoparticle film with the particle diameter of 2.1 nm is completely converted to a crystalline Au film, and the film surface was coarsely granular, having a roughness of several tens of nanometers by field emission-scanning electron microscopy observation. After exposure to vacuum-UV light, the UV―vis absorption spectra revealed that the surface plasmon band at 535 nm showed a red shift with the increasing exposure time, and then the absorption band at 770 nm was clearly observed at 30 min. The diameter of the fused Au nanoparticles was larger than 20 nm on the basis of a transmission electron microscopy observation. These changes indicated that the Au nanoparticles were converted to the crystalline state due to photodecomposition of the decanethiol. Thus, the controllable mild fusion among neighboring Au nanoparticles at room temperature was achieved by vacuum-UV-light exposure due to photodecomposition of the decanethiol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239055 [article] Photoassisted fusion behavior of decanethiol-passivated gold nanoparticles by vacuum ultraviolet light exposure [texte imprimé] / Motohiro Tagaya, Auteur ; Masaru Nakagawa, Auteur . - 2011 . - pp. 7398-7402. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7398-7402 Mots-clés : Nanoparticle Résumé : The photoassisted fusion of a decanethiol-passivated Au-nanoparticle film on a glass substrate by exposure to vacuum-ultraviolet (vacuum-UV) light at 172 nm was investigated and compared to that by thermal fusion. On the basis of the thermal treatment at 200 °C, the X-ray diffraction patterns indicated that the Au-nanoparticle film with the particle diameter of 2.1 nm is completely converted to a crystalline Au film, and the film surface was coarsely granular, having a roughness of several tens of nanometers by field emission-scanning electron microscopy observation. After exposure to vacuum-UV light, the UV―vis absorption spectra revealed that the surface plasmon band at 535 nm showed a red shift with the increasing exposure time, and then the absorption band at 770 nm was clearly observed at 30 min. The diameter of the fused Au nanoparticles was larger than 20 nm on the basis of a transmission electron microscopy observation. These changes indicated that the Au nanoparticles were converted to the crystalline state due to photodecomposition of the decanethiol. Thus, the controllable mild fusion among neighboring Au nanoparticles at room temperature was achieved by vacuum-UV-light exposure due to photodecomposition of the decanethiol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239055