gno Nazionale sulla Scienza e Tecnologia dei Materiali – Perugia 12-15 Giugn gno Nazionale sulla Scienza e Tecnologia dei Materiali – Perugia 12-15 Giugn CVD SYNTHESIS AND CVD SYNTHESIS AND PHOTOCATALYTIC ACTIVITY PHOTOCATALYTIC ACTIVITY OF ZnO NANOPLATELETS OF ZnO NANOPLATELETS C. Maccato* C. Maccato* 2 , , D. Barreca D. Barreca 1 , A. P. , A. P. Ferrucci Ferrucci 2 , , A. Gasparotto A. Gasparotto 2 , C. Maragno , C. Maragno 2 , E. , E. Tondello Tondello 2 1 ISTM-CNR and INSTM - Padova, Italy ISTM-CNR and INSTM - Padova, Italy 2 Department of Chemistry - Padova University Department of Chemistry - Padova University and INSTM - Padova, Italy and INSTM - Padova, Italy * [email protected][email protected]Padova University ISTM-CNR INSTM
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CVD SYNTHESIS AND PHOTOCATALYTIC ACTIVITY OF ZnO NANOPLATELETS
Padova University. ISTM-CNR. INSTM. C. Maccato* 2 , D. Barreca 1 , A. P. Ferrucci 2 , A. Gasparotto 2 , C. Maragno 2 , E. Tondello 2 1 ISTM-CNR and INSTM - Padova, Italy 2 Department of Chemistry - Padova University and INSTM - Padova, Italy * [email protected]. - PowerPoint PPT Presentation
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VI Convegno Nazionale sulla Scienza e Tecnologia dei Materiali – Perugia 12-15 Giugno 2007VI Convegno Nazionale sulla Scienza e Tecnologia dei Materiali – Perugia 12-15 Giugno 2007
CVD SYNTHESIS AND CVD SYNTHESIS AND
PHOTOCATALYTIC ACTIVITY PHOTOCATALYTIC ACTIVITY
OF ZnO NANOPLATELETSOF ZnO NANOPLATELETS
C. Maccato*C. Maccato*22, , D. BarrecaD. Barreca11, A. P. Ferrucci, A. P. Ferrucci22, , A. GasparottoA. Gasparotto22, C. Maragno, C. Maragno22, E. Tondello, E. Tondello22
11 ISTM-CNR and INSTM - Padova, Italy ISTM-CNR and INSTM - Padova, Italy22 Department of Chemistry - Padova University and INSTM - Department of Chemistry - Padova University and INSTM -
• The aim of semiconductor The aim of semiconductor photocatalysis is to effectivelyphotocatalysis is to effectivelydecompose organic pollutants.decompose organic pollutants.
• Photons are used to createPhotons are used to createelectron – hole pairs in electron – hole pairs in
the semiconductor.the semiconductor.
ee- - + O+ O22 → O→ O22--
hh++ + OH + OH- - → OH→ OH
•The competition between separation and recombination processes ofThe competition between separation and recombination processes ofcharge carriers (echarge carriers (e--, h, h++)).
•Surface catalysts-dye charge transfer and Surface catalysts-dye charge transfer and efficient surface adsorption/desorption processes.efficient surface adsorption/desorption processes.
Photocatalytic Activity depends on:Photocatalytic Activity depends on:
AIM:AIM:Synthesis of nanosystems characterized by a Synthesis of nanosystems characterized by a highhigh surface/volume surface/volume
ratio using a bottom-up ratio using a bottom-up CVDCVD approach approach .
Zn(hfa)Zn(hfa)22TMEDATMEDA
(Hhfa=1,1,1,5,5,5-hexafluoro-2,4-pentanedionate;
TMEDA=N,N,N’,N’-tetramethyilethylendiamine)
Zn(NO)3·xH2O
+
1,1,1,5,5,5-hexafluoro-2,4-pentanedione
+
N,N,N’,N’-tetramethylethylendiamine
Zn(hfa)Zn(hfa)22(TMEDA)(TMEDA)
Yield = 63%Yield = 63%
Tobin J. Marks et al., J. Am. Chem. Soc., (2005) 127, 5613.
Zn
O
H
F
N C
22ndnd Generation precursor Generation precursor
• high volatility high volatility and thermal stabilityand thermal stability