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Nanostructured hybrid ZnO thin films for energy conversion.

Moya M, Samantilleke AP, Mollar M, Marí B - Nanoscale Res Lett (2011)

Bottom Line: We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY).High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films.Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department de Física Aplicada-IDF, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, Spain. anura@fisica.uminho.pt.

ABSTRACT
We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY). Both the morphology and porosity of hybrid ZnO films are highly dependent on the type of dyes used in the synthesis. High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films. Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

No MeSH data available.


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AFM images of nanostructured hybrid ZnO thin films.
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Figure 1: AFM images of nanostructured hybrid ZnO thin films.

Mentions: Figure 1 shows AFM images of the surface topography of the nanostructured hybrids of ZnO with (a) EoY, (b) TS-CuPc, and (c) ZnO without dyes. The pure ZnO (Figure 1c) is composed of large crystals (about approx. 500 nm diameter), suggesting high crystallinity of the film. The conductivity of ZnO films is high enough to allow for an efficient redox process, which also provides a large internal surface available for dye intercalation. The ZnO/EoY sample (Figure 1a) shows domains of the same size or even larger than pure ZnO, consisting of numerous features with the size of a few hundred nanometers. This structure appears to show mesoporous morphology with open pores formed during the exposure to NaOH. The pores are undetectable in our topography measurements, because tips with large curvature radii (approx. 30 nm) were used. Ts-CuPc particles were absorbed by the irregularly shaped ZnO. On the other hand, in ZnO/EoY hybrid films, a formation of clusters of EY4-/Zn2+ was observed, in which the edges of the particles were indistinct with a granular and compact morphology. In addition, some cracks on the surface of the hybrid film were seen. Subsequently, globular ZnO clusters were observed, connected one to another, and assimilated within a porous structure. Furthermore, as Figure 1b shows, the structures with TS-CuPc dye are found to be of non-uniform morphology consisting of open and closed pores.


Nanostructured hybrid ZnO thin films for energy conversion.

Moya M, Samantilleke AP, Mollar M, Marí B - Nanoscale Res Lett (2011)

AFM images of nanostructured hybrid ZnO thin films.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211477&req=5

Figure 1: AFM images of nanostructured hybrid ZnO thin films.
Mentions: Figure 1 shows AFM images of the surface topography of the nanostructured hybrids of ZnO with (a) EoY, (b) TS-CuPc, and (c) ZnO without dyes. The pure ZnO (Figure 1c) is composed of large crystals (about approx. 500 nm diameter), suggesting high crystallinity of the film. The conductivity of ZnO films is high enough to allow for an efficient redox process, which also provides a large internal surface available for dye intercalation. The ZnO/EoY sample (Figure 1a) shows domains of the same size or even larger than pure ZnO, consisting of numerous features with the size of a few hundred nanometers. This structure appears to show mesoporous morphology with open pores formed during the exposure to NaOH. The pores are undetectable in our topography measurements, because tips with large curvature radii (approx. 30 nm) were used. Ts-CuPc particles were absorbed by the irregularly shaped ZnO. On the other hand, in ZnO/EoY hybrid films, a formation of clusters of EY4-/Zn2+ was observed, in which the edges of the particles were indistinct with a granular and compact morphology. In addition, some cracks on the surface of the hybrid film were seen. Subsequently, globular ZnO clusters were observed, connected one to another, and assimilated within a porous structure. Furthermore, as Figure 1b shows, the structures with TS-CuPc dye are found to be of non-uniform morphology consisting of open and closed pores.

Bottom Line: We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY).High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films.Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department de Física Aplicada-IDF, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, Spain. anura@fisica.uminho.pt.

ABSTRACT
We report on hybrid films based on ZnO/organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines (TS-CuPc) and Eosin-Y (EoY). Both the morphology and porosity of hybrid ZnO films are highly dependent on the type of dyes used in the synthesis. High photosensitivity was observed for ZnO/EoY films, while a very weak photoresponse was obtained for ZnO/TS-CuPc films. Despite a higher absorption coefficient of TS-CuPc than EoY, in ZnO/EoY hybrid films, the excited photoelectrons between the EoY levels can be extracted through ZnO, and the porosity of ZnO/EoY can also be controlled.

No MeSH data available.


Related in: MedlinePlus