Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/92951
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Type: Journal article
Title: Interferometric nanoporous anodic alumina photonic coatings for optical sensing
Author: Chen, Y.
Santos, A.
Wang, Y.
Kumeria, T.
Wang, C.
Li, J.
Losic, D.
Citation: Nanoscale, 2015; 7(17):7770-7779
Publisher: Royal Society of Chemistry
Issue Date: 2015
ISSN: 2040-3364
2040-3372
Statement of
Responsibility: 
Yuting Chen, Abel Santos, Ye Wang, Tushar Kumeria, Changhai Wang, Junsheng Li, and Dusan Losic
Abstract: Herein, we present a systematic study on the development, optical optimization and sensing applicability of colored photonic coatings based on nanoporous anodic alumina films grown on aluminum substrates. These optical nanostructures, so-called distributed Bragg reflectors (NAA-DBRs), are fabricated by galvanostatic pulse anodization process, in which the current density is altered in a periodic manner in order to engineer the effective medium of the resulting photonic coatings. As-prepared NAA-DBR photonic coatings present brilliant interference colors on the surface of aluminum, which can be tuned at will within the UV-visible spectrum by means of the anodization profile. A broad library of NAA-DBR colors is produced by means of different anodization profiles. Then, the effective medium of these NAA-DBR photonic coatings is systematically assessed in terms of optical sensitivity, low limit of detection and linearity by reflectometric interference spectroscopy (RIfS) in order to optimize their nanoporous structure toward optical sensors with enhanced sensing performance. Finally, we demonstrate the applicability of these photonic nanostructures as optical platforms by selectively detecting gold( III ) ions in aqueous solutions. The obtained results reveal that optimized NAA-DBR photonic coatings can achieve an outstanding sensing performance for gold( III ) ions, with a sensitivity of 22.16 nm μM-1 , a low limit of detection of 0.156 μM( i.e. 30.7 ppb) and excellent linearity within the working range (0.9983).
Rights: © The Royal Society of Chemistry 2015
RMID: 0030026171
DOI: 10.1039/c5nr00369e
Grant ID: http://purl.org/au-research/grants/arc/DE140100549
http://purl.org/au-research/grants/arc/DP120101680
http://purl.org/au-research/grants/arc/FT110100711
Appears in Collections:Chemical Engineering publications

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