Structure and optical properties of mesoporous tungsten oxide
Mesoporous WO 3 was prepared by the sol–gel process and the structure and the optical properties have been investigated. Various techniques were used for characterization of mesoporous WO 3, including Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron mi...
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| Veröffentlicht in: | Journal of alloys and compounds 2005-06, Vol.396 (1), p.251-254 |
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| container_title | Journal of alloys and compounds |
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| creator | Teoh, Lay Gaik Shieh, Jiann Lai, Wei Hao Hung, I Ming Hon, Min Hsiung |
| description | Mesoporous WO
3 was prepared by the sol–gel process and the structure and the optical properties have been investigated. Various techniques were used for characterization of mesoporous WO
3, including Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N
2 adsorption–desorption isotherms and UV–vis spectroscopy. TEM and XRD analyses demonstrated that the mesoporous WO
3 was nanocrystalline. The estimated optical band gap (
E
g) for the mesoporous WO
3 was 3.5
eV. We present evidence for a photoreduction of W
6+ into W
5+ following the irradiation with UV-light. The change in coloration is almost reversible as exposed in oxidation environment. These results suggest that the potential applications of mesostructured WO
3 with nanocrystals in the design of optical devices. |
| doi_str_mv | 10.1016/j.jallcom.2004.12.005 |
| format | Article |
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3 was prepared by the sol–gel process and the structure and the optical properties have been investigated. Various techniques were used for characterization of mesoporous WO
3, including Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N
2 adsorption–desorption isotherms and UV–vis spectroscopy. TEM and XRD analyses demonstrated that the mesoporous WO
3 was nanocrystalline. The estimated optical band gap (
E
g) for the mesoporous WO
3 was 3.5
eV. We present evidence for a photoreduction of W
6+ into W
5+ following the irradiation with UV-light. The change in coloration is almost reversible as exposed in oxidation environment. These results suggest that the potential applications of mesostructured WO
3 with nanocrystals in the design of optical devices.</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2004.12.005</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Exact sciences and technology ; FTIR spectrum ; Mesoporous WO 3 ; Optical band gap ; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation ; Photochromic ; Physics</subject><ispartof>Journal of alloys and compounds, 2005-06, Vol.396 (1), p.251-254</ispartof><rights>2004 Elsevier B.V.</rights><rights>2005 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c436t-affe91f3c03413b861bf233ea406ac6e699f3cdabc1623d95ed137094149ee943</citedby><cites>FETCH-LOGICAL-c436t-affe91f3c03413b861bf233ea406ac6e699f3cdabc1623d95ed137094149ee943</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jallcom.2004.12.005$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16827839$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Teoh, Lay Gaik</creatorcontrib><creatorcontrib>Shieh, Jiann</creatorcontrib><creatorcontrib>Lai, Wei Hao</creatorcontrib><creatorcontrib>Hung, I Ming</creatorcontrib><creatorcontrib>Hon, Min Hsiung</creatorcontrib><title>Structure and optical properties of mesoporous tungsten oxide</title><title>Journal of alloys and compounds</title><description>Mesoporous WO
3 was prepared by the sol–gel process and the structure and the optical properties have been investigated. Various techniques were used for characterization of mesoporous WO
3, including Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N
2 adsorption–desorption isotherms and UV–vis spectroscopy. TEM and XRD analyses demonstrated that the mesoporous WO
3 was nanocrystalline. The estimated optical band gap (
E
g) for the mesoporous WO
3 was 3.5
eV. We present evidence for a photoreduction of W
6+ into W
5+ following the irradiation with UV-light. The change in coloration is almost reversible as exposed in oxidation environment. These results suggest that the potential applications of mesostructured WO
3 with nanocrystals in the design of optical devices.</description><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Exact sciences and technology</subject><subject>FTIR spectrum</subject><subject>Mesoporous WO 3</subject><subject>Optical band gap</subject><subject>Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation</subject><subject>Photochromic</subject><subject>Physics</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNqFkEtLxDAUhYMoOI7-BKEb3bXm1bRZiIj4ggEX6jpk0htJ6TQ1SUX_vRlmwKWru7jfueeeg9A5wRXBRFz1Va-HwfhNRTHmFaEVxvUBWpC2YSUXQh6iBZa0LlvWtsfoJMYeY0wkIwt0_ZrCbNIcoNBjV_gpOaOHYgp-gpAcxMLbYgPRTz74ORZpHj9igrHw366DU3Rk9RDhbD-X6P3h_u3uqVy9PD7f3a5Kw5lIpbYWJLHMYMYJW7eCrC1lDDTHQhsBQsq87PTaEEFZJ2voCGuw5IRLAMnZEl3u7ua_PmeISW1cNDAMeoT8laKtYLThOIP1DjTBxxjAqim4jQ4_imC1LUv1al-W2palCFW5rKy72BvomPPboEfj4p9YtLRpmczczY6DnPbLQVDROBgNdC6ASarz7h-nX9KugzU</recordid><startdate>20050621</startdate><enddate>20050621</enddate><creator>Teoh, Lay Gaik</creator><creator>Shieh, Jiann</creator><creator>Lai, Wei Hao</creator><creator>Hung, I Ming</creator><creator>Hon, Min Hsiung</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20050621</creationdate><title>Structure and optical properties of mesoporous tungsten oxide</title><author>Teoh, Lay Gaik ; Shieh, Jiann ; Lai, Wei Hao ; Hung, I Ming ; Hon, Min Hsiung</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c436t-affe91f3c03413b861bf233ea406ac6e699f3cdabc1623d95ed137094149ee943</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Exact sciences and technology</topic><topic>FTIR spectrum</topic><topic>Mesoporous WO 3</topic><topic>Optical band gap</topic><topic>Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation</topic><topic>Photochromic</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Teoh, Lay Gaik</creatorcontrib><creatorcontrib>Shieh, Jiann</creatorcontrib><creatorcontrib>Lai, Wei Hao</creatorcontrib><creatorcontrib>Hung, I Ming</creatorcontrib><creatorcontrib>Hon, Min Hsiung</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Teoh, Lay Gaik</au><au>Shieh, Jiann</au><au>Lai, Wei Hao</au><au>Hung, I Ming</au><au>Hon, Min Hsiung</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structure and optical properties of mesoporous tungsten oxide</atitle><jtitle>Journal of alloys and compounds</jtitle><date>2005-06-21</date><risdate>2005</risdate><volume>396</volume><issue>1</issue><spage>251</spage><epage>254</epage><pages>251-254</pages><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>Mesoporous WO
3 was prepared by the sol–gel process and the structure and the optical properties have been investigated. Various techniques were used for characterization of mesoporous WO
3, including Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N
2 adsorption–desorption isotherms and UV–vis spectroscopy. TEM and XRD analyses demonstrated that the mesoporous WO
3 was nanocrystalline. The estimated optical band gap (
E
g) for the mesoporous WO
3 was 3.5
eV. We present evidence for a photoreduction of W
6+ into W
5+ following the irradiation with UV-light. The change in coloration is almost reversible as exposed in oxidation environment. These results suggest that the potential applications of mesostructured WO
3 with nanocrystals in the design of optical devices.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2004.12.005</doi><tpages>4</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology FTIR spectrum Mesoporous WO 3 Optical band gap Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Photochromic Physics |
| title | Structure and optical properties of mesoporous tungsten oxide |
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