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Temperature-controlled synthesis and photocatalytic performance of ZnO nanoplatelets (Articolo in rivista)

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Temperature-controlled synthesis and photocatalytic performance of ZnO nanoplatelets (Articolo in rivista) (literal)

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D. Barreca, A.P. Ferrucci, A. Gasparotto, C. Maccato, C. Maragno, E. Tondello (2007)
Temperature-controlled synthesis and photocatalytic performance of ZnO nanoplatelets
in Chemical vapor deposition (Print)
(literal)

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D. Barreca, A.P. Ferrucci, A. Gasparotto, C. Maccato, C. Maragno, E. Tondello (literal)

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1: ISTM-CNR and INSTM, Department of Chemistry, Padova University, Via Marzolo, 1 - 35131 Padova (Italy) 2,3,4,5,6: Department of Chemistry, Padova University and INSTM, Via Marzolo, 1 - 35131 Padova (Italy) (literal)

Titolo

Temperature-controlled synthesis and photocatalytic performance of ZnO nanoplatelets (literal)

Abstract

Zinc oxide nanoplatelets are successfully grown on Si(100) by CVD starting from a second-generation ZnII precursor, Zn(hfa)2?TMEDA (Hhfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione; TMEDA=N,N,N?,N?-tetramethylethylenediamine). The synthesis is performed in a nitrogen + wet oxygen atmosphere under optimized conditions, at temperatures between 250 and 500 °C. Field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and glancing incidence X-ray diffraction (GIXRD) analyses indicate a direct correlation between morphology and microstructure. The formation of ZnO nanoplatelets, whose characteristics depend on the deposition temperature, is proposed to result from the synergistic combination of a vapor/solid (VS) mechanism and a preferential direction-conducting growth. The chemical composition is analyzed by means of X-ray photoelectron and energy dispersive X-ray spectroscopies (XPS, EDXS). Finally, the photocatalytic performances of ZnO nanoplatelets in the decomposition of the azo-dye Orange II are investigated and compared to those of uniform ZnO coatings synthesized in the absence of water vapor. The obtained results show a higher activity in the case of nanoplatelets due to their peculiar morphology. (literal)

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