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Type: Conference paper
Title: Reflectometric interference biosensing using nanopores: integration into microfluidics
Author: Kumeria, T.
Kurkuri, M.
Diener, K.
Zhang, C.
Parkinson, L.
Losic, D.
Citation: Proceedings of SPIE, vol. 8204 - Smart Nano-Micro Materials and Devices, 5–7 December 2011, Hawthorn, Australia / S. Juodkazis & M. Gu (eds): 82043C
Publisher: SPIE
Publisher Place: Australia
Issue Date: 2011
Series/Report no.: Proceedings of SPIE
ISBN: 9780819488459
ISSN: 0277-786X
Conference Name: Smart Nano-Micro Materials and Devices (2011 : Hawthorn, Australia)
Editor: Juodkazis, S.
Gu, M.
Statement of
Tushar Kumeria, Mahaveer Kurkuri, Kerrilyn Diener, Chen Zhang, Luke Parkinson and Dusan Losic
Abstract: The concept of a microfluidic biosensing device based on reflective interferometric spectroscopy (RIfS) is presented in this article. The key element of the sensor is a highly ordered nanoporous structure of anodic aluminium oxide (AAO) integrated into a microfluidic chip combined with an optical fiber spectrophotometer. AAO was prepared by electrochemical anodization of aluminium using 0.3 M oxalic acid. The structural and geometrical features of the AAO porous structures were controlled to provide optimal RIfS sensing characteristics and there sensing capabilities were explored using two different strategies; i) detection based on the response generated by pefusion of analyte ions inside the pores and ii) detection based on specific adsorption of analyte molecules on surface of AAO pores. The second strategy is based on chemical modification of the AAO surface to target molecules based on specific surface binding reactions. In this work two cases are presented, including the binding of small thiol molecules on gold-modified AAO (Au-AAO) and binding of larger targets such as circulating tumour cells (CTC) on antibody-modified AAO. Our preliminary results show an excellent capability of our system in the detection of different analytes using both strategies, and confirm good potential for the development and application of interferometric label-free biosensing devices in a wide range of biomedical applications. © 2011 SPIE.
Keywords: Nanoporous alumina (AAO)
reflective interference
label-free sensing
Rights: © (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE)
DOI: 10.1117/12.903217
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