Adsorption of bi-isonicotinic acid on anatase TiO2(101) and (001) studied by photoemission and NEXAFS spectroscopy

Thomas, Andrew G.; Flavell, Wendy R.; Chatwin, C.; Rayner, S.; Tsoutsou, D.; Kumarasinghe, A.R.; Brete, Daniel; Johal, T. K.; Patel, Shelain; Purton, John A.

doi:10.1016/j.susc.2005.07.013

Cited by 27 publications

(49 citation statements)

References 28 publications

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“…1. A similar adsorption geometry has also been found on the anatase TiO 2 surface [15,21]. Bi-isonicotinic anchors to the surface through the deprotonated carboxylic groups, and as such all four oxygen atoms in the molecule are equivalent [9][10][11].…”

Section: Adsorption Of Bi-isonicotinic Acidsupporting

confidence: 68%

Molecular damage in bi-isonicotinic acid adsorbed on rutile TiO2(110)

et al. 2008

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Section: Adsorption Of Bi-isonicotinic Acidsupporting

confidence: 68%

Molecular damage in bi-isonicotinic acid adsorbed on rutile TiO2(110)

et al. 2008

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“…The distance between the Ru ion and the TiO 2 thus depends strongly upon the tilt angle of the pyridyl rings on the surface. Because the dicarboxylated bpy ligand (bi-isonicotinic acid) tends to distort upon anchoring on the TiO 2 surface, different geometries are expected on the (101) and (001) surfaces [45]. The distance between the Ru center of the dye and the Ti 4+ ion directly linked to one of the oxygen atoms of the carboxylic anchor is ≈10 Å when the bpy adopts a flat structure.…”

Section: S Tiomentioning

confidence: 99%

Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets

Laskova

Zukalová

Kavan

et al. 2012

J Solid State Electrochem

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A nanocrystalline TiO 2 (anatase) nanosheet exposing mainly the (001) crystal faces was tested as photoanode material in dye-sensitized solar cells. The nanosheets were prepared by hydrothermal growth in HF medium. Good-quality thin films were deposited on F-doped SnO 2 support from the TiO 2 suspension in ethanolic or aqueous media. The anatase (001) face adsorbs a smaller amount of the used dye sensitizer (C101) per unit area than the (101) face which was tested as a reference. The corresponding solar cell with sensitized (001)-nanosheet photoanode exhibits a larger open-circuit voltage than the reference cell with (101)-terminated anatase nanocrystals. The voltage enhancement is attributed to the negative shift of flatband potential for the (001) face. This conclusion rationalizes earlier works on similar systems, and it indicates that careful control of experimental conditions is needed to extract the effect of band energetic on the current/voltage characteristics of dye-sensitized solar cell.

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“…We have previously studied the adsorption of biisonicotinic acid ͑part of the ligand structure of the Ru bipyridyl dye͒ on anatase TiO 2 ͑101͒ and ͑001͒ using photoemission and near-edge x-ray absorption fine structure. 26 The interaction between a Ru ͑II͒ dye molecule and both nanoparticulate anatase and CuI at the TiO 2 / CuI interface has been studied by Karlsson et al 27 In the present study we focus our attention on model "dye-free" interfaces fabricated by the deposition of CuI onto the surfaces of single crystal anatase TiO 2 ͑101͒ and nanoparticulate thin films of TiO 2 in ultrahigh vacuum ͑UHV͒, in order to model the heterojunction at the heart of the p-CuI / n-TiO 2 solid state solar cell. The electronic structure at the interface between bulk anatase single crystal and CuI is compared with that between nanoparticulate anatase thin films and CuI.…”

Section: Introductionmentioning

confidence: 99%

Electronic properties of the interface between p-CuI and anatase-phase n-TiO2 single crystal and nanoparticulate surfaces: A photoemission study

Kumarasinghe

Flavell

Thomas

et al. 2007

The Journal of Chemical Physics

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We present a study of the growth of the p-type inorganic semiconductor CuI on n-type TiO2 anatase single crystal (101) surfaces and on nanoparticulate anatase surfaces using synchrotron radiation photoemission spectroscopy. Core level photoemission data obtained using synchrotron radiation reveal that both the substrate (TiO2) and the overlayer (CuI) core levels shift to a lower binding energy to different degrees following the growth of CuI on TiO2. Valence band photoemission data show that the valence band maximum of the clean substrate differs from that of the dosed surface which may be interpreted qualitatively as due to the introduction of a new density of states within the band gap of TiO2 as a result of the growth of CuI. The valence band offset for the heterojunction n-TiO2p-CuI has been measured using photoemission for both nanoparticulate and single crystal TiO2 surfaces, and the band energy alignment for these heterojunction interfaces is presented. With the information obtained here, it is suggested that the interface between p-CuI and single crystal anatase-phase n-TiO2 is a type-II heterojunction interface, with significant band bending. The measured total band bending matches the work function change at the interface, i.e., there is no interface dipole. In the case of the nanoparticulate interface, an interface dipole is found, but band bending within the anatase nanoparticles remains quite significant. We show that the corresponding depletion layer may be accommodated within the dimension of the nanoparticles. The results are discussed in the context of the functional properties of dye-sensitized solid state solar cells.

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Adsorption of bi-isonicotinic acid on anatase TiO2(101) and (001) studied by photoemission and NEXAFS spectroscopy

Cited by 27 publications

References 28 publications

Molecular damage in bi-isonicotinic acid adsorbed on rutile TiO2(110)

Molecular damage in bi-isonicotinic acid adsorbed on rutile TiO2(110)

Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets

Electronic properties of the interface between p-CuI and anatase-phase n-TiO2 single crystal and nanoparticulate surfaces: A photoemission study

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