Determining the orientation and molecular packing of organic dyes on a TiO(2) surface using x-ray reflectometry

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dc.contributor.authorGriffith, MJen_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorTriani, Gen_AU
dc.contributor.authorWagner, Pen_AU
dc.contributor.authorWallace, GGen_AU
dc.contributor.authorOfficer, DLen_AU
dc.date.accessioned2012-01-12T05:01:54Zen_AU
dc.date.available2012-01-12T05:01:54Zen_AU
dc.date.issued2011-11-01en_AU
dc.date.statistics2012-01-12en_AU
dc.description.abstractThe determination of the orientation and molecular density for several porphyrin dyes adsorbed on planar TiO2 surfaces using X-ray reflectometry (XRR) is reported. Adsorption of nanoscale water layers occurred rapidly upon exposure of freshly prepared TiO2 surfaces to ambient conditions; however, this was successfully eliminated, resulting in clearly discernible adsorbed dye layers for sensitized surfaces. Adsorbed dye orientations, determined from computations constrained by the measured dye layer thickness, were calculated to have a binding tilt angle of 35°?40°. Combining the XXR data with the orientation models indicates that the porphyrins form densely packed surfaces with an intermolecular spacing of 3?4 Ã…, consistent with Ï€?Ï€ stacking interactions. Changes in the molecular size of probe dyes were reflected in corresponding changes in the measured dye layer thickness, confirming the ability of this technique to resolve small variations in dye layer thickness and consequently adsorption orientation. Application of these results to understanding the behavior of dye-sensitized devices is discussed. © 2011, American Chemical Societyen_AU
dc.identifier.citationGriffith, M. J., James, M., Triani, G., Wagner, P., Wallace, G. G., & Officer, D.L. (2011). Determining the orientation and molecular packing of organic dyes on a TiO(2) surface using x-ray reflectometry. Langmuir, 27(21), 12944-12950. doi:10.1021/la202598cen_AU
dc.identifier.govdoc3884en_AU
dc.identifier.issn0743-7463en_AU
dc.identifier.issue21en_AU
dc.identifier.journaltitleLangmuiren_AU
dc.identifier.pagination12944-12950en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/la202598cen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3992en_AU
dc.identifier.volume27en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectDyesen_AU
dc.subjectFilmsen_AU
dc.subjectSolar cellsen_AU
dc.subjectReflectivityen_AU
dc.subjectRecombinationen_AU
dc.subjectElectronic circuitsen_AU
dc.titleDetermining the orientation and molecular packing of organic dyes on a TiO(2) surface using x-ray reflectometryen_AU
dc.typeJournal Articleen_AU
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