Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/104915
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Type: Journal article
Title: Engineering of surface chemistry for enhanced sensitivity in nanoporous interferometric sensing platforms
Author: Law, C.
Sylvia, G.
Nemati, M.
Yu, J.
Losic, D.
Abell, A.
Santos, A.
Citation: ACS Applied Materials and Interfaces, 2017; 9(10):8929-8940
Publisher: AMER CHEMICAL SOC
Issue Date: 2017
ISSN: 1944-8244
1944-8252
Statement of
Responsibility: 
Cheryl Suwen Law, Georgina M. Sylvia, Madieh Nemati, Jingxian Yu, Dusan Losic, Andrew D. Abell and Abel Santos
Abstract: We explore new approaches to engineering the surface chemistry of interferometric sensing platforms based on nanoporous anodic alumina (NAA) and reflectometric interference spectroscopy (RIfS). Two surface engineering strategies are presented, namely (i) selective chemical functionalization of the inner surface of NAA pores with amine-terminated thiol molecules and (ii) selective chemical functionalization of the top surface of NAA with dithiol molecules. The strong molecular interaction of Au3+ ions with thiol-containing functional molecules of alkane chain or peptide character provides a model sensing system with which to assess the sensitivity of these NAA platforms by both molecular feature and surface engineering. Changes in the effective optical thickness of the functionalized NAA photonic films (i.e., sensing principle), in response to gold ions, are monitored in real-time by RIfS. 6-Amino-1-hexanethiol (inner surface) and 1,6-hexanedithiol (top surface), the most sensitive functional molecules from approaches i and ii, respectively, were combined into a third sensing strategy whereby the NAA platforms are functionalized on both the top and inner surfaces concurrently. Engineering of the surface according to this approach resulted in an additive enhancement in sensitivity of up to 5-fold compared to previously reported systems. This study advances the rational engineering of surface chemistry for interferometric sensing on nanoporous platforms with potential applications for real-time monitoring of multiple analytes in dynamic environments.
Keywords: nanoporous anodic alumina; optical sensing; reflectometric interference spectroscopy; sensing performance; surface chemistry engineering
Rights: Copyright © 2017 American Chemical Society
RMID: 0030066000
DOI: 10.1021/acsami.7b01116
Grant ID: http://purl.org/au-research/grants/arc/DE140100549
http://purl.org/au-research/grants/arc/CE140100003
http://purl.org/au-research/grants/arc/DP120101680
http://purl.org/au-research/grants/arc/FT110100711
Appears in Collections:Chemistry and Physics publications

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