IR Spectroscopic investigations of gasochromic and electrochromic sol-gel-derived peroxotungstic acid/ormosil composite and crystalline WO3 films
We studied the gasochromic effect of amorphous peroxopolytungstic acid (W-PTA), W-PTA (ormosil) and crystalline WO3 films. These latter films were prepared after a heat treatment of W-PTA/ormosil films at 450°C. The ormosil served as a template, providing the monoclinic WO3 films with adequate poros...
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| Veröffentlicht in: | Journal of sol-gel science and technology 2002-05, Vol.24 (1), p.5-22 |
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| creator | OREL, Boris GROSELJ, N KRASOVEC, U. Opara JESE, R GEORG, A |
| description | We studied the gasochromic effect of amorphous peroxopolytungstic acid (W-PTA), W-PTA (ormosil) and crystalline WO3 films. These latter films were prepared after a heat treatment of W-PTA/ormosil films at 450°C. The ormosil served as a template, providing the monoclinic WO3 films with adequate porosity. The spill-over effect was attained by impregnating the porous WO3 crystalline films with H2PtCl6 followed by a heat treatment at 380°C. The amorphous films became gasochromic with the addition of PdCl2 to the corresponding W-PTA and W-PTA/ormosil sols.Structural features of all the films were studied with the help of infrared (IR) spectroscopy and transmission electron microscopy (TEM). In situ IR spectra of the films, performed in the presence of reducing (H2/Ar) and oxidising (O2/Ar) gases, revealed a reversible transformation of the monoclinic to the tetragonal HxWO3 phase. At the same time the coloration (reduction) of the amorphous films was accompanied by the formation of coordinated water molecules and increased numbers of W=O bonds. Gasochromic colouring/bleaching changes and the corresponding kinetics were assessed from in situ UV-visible transmission measurements on the films. |
| doi_str_mv | 10.1023/A:1015147530846 |
| format | Article |
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Opara ; JESE, R ; GEORG, A</creator><creatorcontrib>OREL, Boris ; GROSELJ, N ; KRASOVEC, U. Opara ; JESE, R ; GEORG, A</creatorcontrib><description>We studied the gasochromic effect of amorphous peroxopolytungstic acid (W-PTA), W-PTA (ormosil) and crystalline WO3 films. These latter films were prepared after a heat treatment of W-PTA/ormosil films at 450°C. The ormosil served as a template, providing the monoclinic WO3 films with adequate porosity. The spill-over effect was attained by impregnating the porous WO3 crystalline films with H2PtCl6 followed by a heat treatment at 380°C. The amorphous films became gasochromic with the addition of PdCl2 to the corresponding W-PTA and W-PTA/ormosil sols.Structural features of all the films were studied with the help of infrared (IR) spectroscopy and transmission electron microscopy (TEM). In situ IR spectra of the films, performed in the presence of reducing (H2/Ar) and oxidising (O2/Ar) gases, revealed a reversible transformation of the monoclinic to the tetragonal HxWO3 phase. At the same time the coloration (reduction) of the amorphous films was accompanied by the formation of coordinated water molecules and increased numbers of W=O bonds. Gasochromic colouring/bleaching changes and the corresponding kinetics were assessed from in situ UV-visible transmission measurements on the films.</description><identifier>ISSN: 0928-0707</identifier><identifier>EISSN: 1573-4846</identifier><identifier>DOI: 10.1023/A:1015147530846</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Bleaching ; Chemistry ; Colloidal gels. Colloidal sols ; Colloidal state and disperse state ; Coloring ; Crystal structure ; Crystallinity ; Electrochromism ; Exact sciences and technology ; General and physical chemistry ; Heat treatment ; Impregnation ; Infrared spectroscopy ; Porosity ; Sol-gel processes ; Sols ; Spectrum analysis ; Transmission electron microscopy ; Tungsten oxides ; Water chemistry</subject><ispartof>Journal of sol-gel science and technology, 2002-05, Vol.24 (1), p.5-22</ispartof><rights>2002 INIST-CNRS</rights><rights>Journal of Sol-Gel Science and Technology is a copyright of Springer, (2002). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,782,786,27933,27934</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13643882$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>OREL, Boris</creatorcontrib><creatorcontrib>GROSELJ, N</creatorcontrib><creatorcontrib>KRASOVEC, U. Opara</creatorcontrib><creatorcontrib>JESE, R</creatorcontrib><creatorcontrib>GEORG, A</creatorcontrib><title>IR Spectroscopic investigations of gasochromic and electrochromic sol-gel-derived peroxotungstic acid/ormosil composite and crystalline WO3 films</title><title>Journal of sol-gel science and technology</title><description>We studied the gasochromic effect of amorphous peroxopolytungstic acid (W-PTA), W-PTA (ormosil) and crystalline WO3 films. These latter films were prepared after a heat treatment of W-PTA/ormosil films at 450°C. The ormosil served as a template, providing the monoclinic WO3 films with adequate porosity. The spill-over effect was attained by impregnating the porous WO3 crystalline films with H2PtCl6 followed by a heat treatment at 380°C. The amorphous films became gasochromic with the addition of PdCl2 to the corresponding W-PTA and W-PTA/ormosil sols.Structural features of all the films were studied with the help of infrared (IR) spectroscopy and transmission electron microscopy (TEM). In situ IR spectra of the films, performed in the presence of reducing (H2/Ar) and oxidising (O2/Ar) gases, revealed a reversible transformation of the monoclinic to the tetragonal HxWO3 phase. At the same time the coloration (reduction) of the amorphous films was accompanied by the formation of coordinated water molecules and increased numbers of W=O bonds. Gasochromic colouring/bleaching changes and the corresponding kinetics were assessed from in situ UV-visible transmission measurements on the films.</description><subject>Bleaching</subject><subject>Chemistry</subject><subject>Colloidal gels. Colloidal sols</subject><subject>Colloidal state and disperse state</subject><subject>Coloring</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Electrochromism</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Heat treatment</subject><subject>Impregnation</subject><subject>Infrared spectroscopy</subject><subject>Porosity</subject><subject>Sol-gel processes</subject><subject>Sols</subject><subject>Spectrum analysis</subject><subject>Transmission electron microscopy</subject><subject>Tungsten oxides</subject><subject>Water chemistry</subject><issn>0928-0707</issn><issn>1573-4846</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNo1j01LAzEQhoMoWKtnrwHxuDafm423UvwoFAp-4HFJk2xNyW7WZFvsz_AfG2o9zcvMM88wAFxjdIcRoZPpPUaYYyY4RRUrT8AIc0ELlvMpGCFJqgIJJM7BRUobhBBnWIzAz_wFvvZWDzEkHXqnoet2Ng1urQYXugRDA9cqBf0ZQ5unqjPQ-gP_30rBF2vrC2Oj21kDexvDdxi23Tpr8oZ2ZhJiG5LzUIe2z2GwB5GO-zQo711n4ceSwsb5Nl2Cs0b5ZK-OdQzeHx_eZs_FYvk0n00XRU8wHooVLbnUTHEirS0R42YlKo3RChusjGVSaW6aBivCCLcIMUaEFlxKK5VgRNIxuPnz9jF8bfPL9SZsY5dP1oRwyTkrK5Kp2yOlkla-iarTLtV9dK2K-xrTktEqc790BXcX</recordid><startdate>20020501</startdate><enddate>20020501</enddate><creator>OREL, Boris</creator><creator>GROSELJ, N</creator><creator>KRASOVEC, U. Opara</creator><creator>JESE, R</creator><creator>GEORG, A</creator><general>Springer</general><general>Springer Nature B.V</general><scope>IQODW</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20020501</creationdate><title>IR Spectroscopic investigations of gasochromic and electrochromic sol-gel-derived peroxotungstic acid/ormosil composite and crystalline WO3 films</title><author>OREL, Boris ; GROSELJ, N ; KRASOVEC, U. Opara ; JESE, R ; GEORG, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p211t-b3659c4a529ee6045db78c10b1d1ade49ac5dff1a2425e004427c7599e9a74293</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Bleaching</topic><topic>Chemistry</topic><topic>Colloidal gels. Colloidal sols</topic><topic>Colloidal state and disperse state</topic><topic>Coloring</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>Electrochromism</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Heat treatment</topic><topic>Impregnation</topic><topic>Infrared spectroscopy</topic><topic>Porosity</topic><topic>Sol-gel processes</topic><topic>Sols</topic><topic>Spectrum analysis</topic><topic>Transmission electron microscopy</topic><topic>Tungsten oxides</topic><topic>Water chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>OREL, Boris</creatorcontrib><creatorcontrib>GROSELJ, N</creatorcontrib><creatorcontrib>KRASOVEC, U. Opara</creatorcontrib><creatorcontrib>JESE, R</creatorcontrib><creatorcontrib>GEORG, A</creatorcontrib><collection>Pascal-Francis</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><jtitle>Journal of sol-gel science and technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>OREL, Boris</au><au>GROSELJ, N</au><au>KRASOVEC, U. Opara</au><au>JESE, R</au><au>GEORG, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>IR Spectroscopic investigations of gasochromic and electrochromic sol-gel-derived peroxotungstic acid/ormosil composite and crystalline WO3 films</atitle><jtitle>Journal of sol-gel science and technology</jtitle><date>2002-05-01</date><risdate>2002</risdate><volume>24</volume><issue>1</issue><spage>5</spage><epage>22</epage><pages>5-22</pages><issn>0928-0707</issn><eissn>1573-4846</eissn><abstract>We studied the gasochromic effect of amorphous peroxopolytungstic acid (W-PTA), W-PTA (ormosil) and crystalline WO3 films. These latter films were prepared after a heat treatment of W-PTA/ormosil films at 450°C. The ormosil served as a template, providing the monoclinic WO3 films with adequate porosity. The spill-over effect was attained by impregnating the porous WO3 crystalline films with H2PtCl6 followed by a heat treatment at 380°C. The amorphous films became gasochromic with the addition of PdCl2 to the corresponding W-PTA and W-PTA/ormosil sols.Structural features of all the films were studied with the help of infrared (IR) spectroscopy and transmission electron microscopy (TEM). In situ IR spectra of the films, performed in the presence of reducing (H2/Ar) and oxidising (O2/Ar) gases, revealed a reversible transformation of the monoclinic to the tetragonal HxWO3 phase. At the same time the coloration (reduction) of the amorphous films was accompanied by the formation of coordinated water molecules and increased numbers of W=O bonds. Gasochromic colouring/bleaching changes and the corresponding kinetics were assessed from in situ UV-visible transmission measurements on the films.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1023/A:1015147530846</doi><tpages>18</tpages></addata></record> |
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| subjects | Bleaching Chemistry Colloidal gels. Colloidal sols Colloidal state and disperse state Coloring Crystal structure Crystallinity Electrochromism Exact sciences and technology General and physical chemistry Heat treatment Impregnation Infrared spectroscopy Porosity Sol-gel processes Sols Spectrum analysis Transmission electron microscopy Tungsten oxides Water chemistry |
| title | IR Spectroscopic investigations of gasochromic and electrochromic sol-gel-derived peroxotungstic acid/ormosil composite and crystalline WO3 films |
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