Please use this identifier to cite or link to this item:
http://acervodigital.unesp.br/handle/11449/40105
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Oliveira, Daniela C. | - |
dc.contributor.author | Macedo, Andreia G. | - |
dc.contributor.author | Silva, Nuno J. O. | - |
dc.contributor.author | Molina, Celso | - |
dc.contributor.author | Ferreira, Rute A. S. | - |
dc.contributor.author | Andre, Paulo S. | - |
dc.contributor.author | Dahmouche, Karim | - |
dc.contributor.author | Bermudez, Veronica de Zea | - |
dc.contributor.author | Messaddeq, Younes | - |
dc.contributor.author | Ribeiro, Sidney José Lima | - |
dc.contributor.author | Carlos, Luis D. | - |
dc.date.accessioned | 2014-05-20T15:30:48Z | - |
dc.date.accessioned | 2016-10-25T18:06:25Z | - |
dc.date.available | 2014-05-20T15:30:48Z | - |
dc.date.available | 2016-10-25T18:06:25Z | - |
dc.date.issued | 2008-06-10 | - |
dc.identifier | http://dx.doi.org/10.1021/cm7031702 | - |
dc.identifier.citation | Chemistry of Materials. Washington: Amer Chemical Soc, v. 20, n. 11, p. 3696-3705, 2008. | - |
dc.identifier.issn | 0897-4756 | - |
dc.identifier.uri | http://hdl.handle.net/11449/40105 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/40105 | - |
dc.description.abstract | Organic-inorganic hybrids containing methacrylic acid (McOH, CH(2)= C(CH(3))COOH)) modified zirconium tetrapropoxide, Zr(OPr(n))(4), classed as di-ureasil-zirconium oxo-cluster hybrids, have been prepared and structurally characterized by X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), Fourier transform infrared (FT-IR) and Raman (FT-Raman) spectroscopies, Si and C nuclear magnetic resonance (NMR), and atomic force microscopy (AFM). XRD and SAXS results have pointed out the presence of Si- and Zr-based nanobuilding blocks (NBBs) dispersed into the organic phase. Inter-NBBs correlation distances have been estimated for the pure di-ureasil and a model compound obtained. by hydrolysis/condensation of Zr(OPr(n))(4):McOH (molar ratio 1: 1): d(Si) approximate to 26 +/- 1 angstrom and d(Zr) approximate to 16 +/- 1 angstrom, respectively. In the case of the di-ureasil-zirconium oxo-cluster hybrids, these distances depend on the Zr relative molar percentage (rel. mol. Zr %) (d(Si) ranges from 18 to 25 angstrom and d(Zr) from 14 to 23 angstrom, as the rel. mol. Zr % increases from 5 to 75), suggesting that the Si- and Zr-based clusters are interconstrained. Complementary data from FT-IR, FT-Raman, (29)Si and (13)C NMR, and AFM support to a structural model where McOH-modified Zr-based NBBs (Zr-OMc) are present over the whole range of composition. At low Zr-OMc contents (rel. mol. Zr % <30) the clusters are well-dispersed within the di-ureasil host, whereas segregation occurs at the 0.1 mu m scale at high Zr-OMc concentration (rel. mol. Zr % = 50). No Zr-O-Si heterocondensation has been discerned. Monomode waveguides, diffractions gratings, and Fabry-Perot cavities have been written through the exposure of the hybrid monoliths to UV light. FT-Raman has shown that the chemical process that takes place under illumination is the polymerization of the methacrylate groups of the Zr-OMc NBBs. The guidance region in patterned channels is a Gaussian section located below the exposed surface with typical dimensions of 320 mu m wide and 88 mu m deep. The effective refractive index is 1.5162 (maximum index contrast on the order of 1 x 10(-4)) and the reflection coeficient of the Fabry-Perot cavity (formed by a grating patterned into a 0.278 cm channel) is 0.042 with a free spectral range value of 35.6 GHz. | en |
dc.format.extent | 3696-3705 | - |
dc.language.iso | eng | - |
dc.publisher | Amer Chemical Soc | - |
dc.source | Web of Science | - |
dc.title | Photopatternable di-ureasil-zirconium oxocluster organic-inorganic hybrids as cost effective integrated optical substrates | en |
dc.type | outro | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.contributor.institution | Univ Aveiro | - |
dc.contributor.institution | Univ Estadual Zona Oeste | - |
dc.contributor.institution | Univ Tras Montes & Alto Douro | - |
dc.description.affiliation | Univ São Paulo, Inst Chem, UNESP, BR-14801970 Araraquara, SP, Brazil | - |
dc.description.affiliation | Univ Aveiro, Dept Phys, CICECO, P-3810193 Aveiro, Portugal | - |
dc.description.affiliation | Univ Aveiro, Dept Phys, Inst Telecommun, P-3810193 Aveiro, Portugal | - |
dc.description.affiliation | Univ Estadual Zona Oeste, BR-23070200 Rio de Janeiro, Brazil | - |
dc.description.affiliation | Univ Tras Montes & Alto Douro, Dept Quim, P-5000801 Vila Real, Portugal | - |
dc.description.affiliation | Univ Tras Montes & Alto Douro, CQ VR, P-5000801 Vila Real, Portugal | - |
dc.description.affiliationUnesp | Univ São Paulo, Inst Chem, UNESP, BR-14801970 Araraquara, SP, Brazil | - |
dc.identifier.doi | 10.1021/cm7031702 | - |
dc.identifier.wos | WOS:000256443900025 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Chemistry of Materials | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.