Imperial College London
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DrAndreasKafizas

Faculty of Natural Sciences, Department of Chemistry

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6752a.kafizas Website

 
 
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Location

 

301GMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Jiamprasertboon:2019:10.1002/chem.201902175,
author = {Jiamprasertboon, A and Kafizas, A and Sachs, M and Ling, M and Alotaibi, AM and Lu, Y and Sirithanon, T and Parkin, IP and Carmalt, CJ},
doi = {10.1002/chem.201902175},
journal = {Chemistry - A European Journal},
pages = {11337--11345},
title = {Heterojunction α-Fe2O3/ZnO films with enhanced photocatalytic properties grown by aerosol-assisted chemical vapour deposition.},
url = {http://dx.doi.org/10.1002/chem.201902175},
volume = {25},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Type-I heterojunction films of α-Fe2O3/ZnO are reported herein as a non-titania based photocatalyst that shows remarkable enhancement in the photocatalytic properties towards stearic acid degradation under UVA light exposure (λ = 365 nm), with a quantum efficiency of ξ = 4.42 ± 1.54 × 10-4 molecules degraded/photon, which was about 16 times greater than that of α-Fe2O3, and 2.5 times greater than that of ZnO. As the degradation of stearic acid requires 104 electron transfers for each molecule, this represents an overall quantum efficiency of 4.60% for the α-Fe2O3/ZnO heterojunction. Time-resolved transient absorption spectroscopy (TAS) revealed the charge carrier behavior responsible for this increase in activity. Photogenerated electrons, formed in the ZnO layer, were transferred into the α-Fe2O3 layer on the pre-µs timescale, which reduced electron-hole recombination. This increased the lifetime of photogenerated holes formed in ZnO that oxidise stearic acid. The heterojunction α-Fe2O3/ZnO films grown herein show potential environmental applications as coatings for self-cleaning windows and surfaces.
AU  - Jiamprasertboon,A
AU  - Kafizas,A
AU  - Sachs,M
AU  - Ling,M
AU  - Alotaibi,AM
AU  - Lu,Y
AU  - Sirithanon,T
AU  - Parkin,IP
AU  - Carmalt,CJ
DO  - 10.1002/chem.201902175
EP  - 11345
PY  - 2019///
SN  - 0947-6539
SP  - 11337
TI  - Heterojunction α-Fe2O3/ZnO films with enhanced photocatalytic properties grown by aerosol-assisted chemical vapour deposition.
T2  - Chemistry - A European Journal
UR  - http://dx.doi.org/10.1002/chem.201902175
UR  - https://www.ncbi.nlm.nih.gov/pubmed/31241218
UR  - https://onlinelibrary.wiley.com/doi/abs/10.1002/chem.201902175
UR  - http://hdl.handle.net/10044/1/71693
VL  - 25
ER  -
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