Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/119226
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Type: | Journal article |
Title: | Environmental copper sensor based on polyethylenimine-functionalized nanoporous anodic alumina interferometers |
Author: | Kaur, S. Law, C.S. Williamson, N.H. Kempson, I. Popat, A. Kumeria, T. Santos, A. |
Citation: | Analytical Chemistry, 2019; 91(8):5011-5020 |
Publisher: | American Chemical Society |
Issue Date: | 2019 |
ISSN: | 0003-2700 1520-6882 |
Statement of Responsibility: | Simarpreet Kaur, Cheryl Suwen Law, Nathan Hu Williamson, Ivan Kempson, Amirali Popat, Tushar Kumeria and Abel Santos |
Abstract: | Anthropogenic copper pollution of environmental waters from sources such as acid mine drainage, antifouling paints, and industrial waste discharge is a major threat to our environment and human health. This study presents an optical sensing system that combines self-assembled glutaraldehyde-cross-linked double-layered polyethylenimine (PEI-GA-PEI)-modified nanoporous anodic alumina (NAA) interferometers with reflectometric interference spectroscopy (RIfS) for label-free, selective monitoring of ionic copper in environmental waters. Calibration of the sensing system with analytical solutions of copper shows a linear working range between 1 and 100 mg L-1, and a low limit of detection of 0.007 ± 0.001 mg L-1 (i.e., ∼0.007 ppm). Changes in the effective optical thickness (ΔOTeff) of PEI-GA-PEI-functionalized NAA interferometers are monitored in real-time by RIfS, and correlated with the amount of ionic copper present in aqueous solutions. The system performance is validated through X-ray photoelectron spectroscopy (XPS) and the spatial distribution of copper within the nanoporous films is characterized by time-of-flight-secondary ion mass spectroscopy (TOF-SIMS). The specificity and chemical selectivity of the PEI-GA-PEI-NAA sensor to Cu2+ ions is verified by screening six different metal ion solutions containing potentially interfering ions such as Al3+, Cd2+, Fe3+, Pb2+, Ni2+, and Zn2+. Finally, the performance of the PEI-GA-PEI-NAA sensor for real-life applications is demonstrated using legacy acid mine drainage liquid and tap water for qualitative and quantitative detection of copper ions. This study provides new opportunities to develop portable, cost-competitive, and ultrasensitive sensing systems for real-life environmental applications. |
Keywords: | Aluminum Oxide Copper Polyethyleneimine Calibration Interferometry Electrodes Nanopores |
Rights: | © 2019 American Chemical Society |
DOI: | 10.1021/acs.analchem.8b04963 |
Grant ID: | http://purl.org/au-research/grants/arc/DE140100549 http://purl.org/au-research/grants/arc/CE140100003 http://purl.org/au-research/grants/nhmrc/1146627 http://purl.org/au-research/grants/nhmrc/1143296 |
Published version: | http://dx.doi.org/10.1021/acs.analchem.8b04963 |
Appears in Collections: | Aurora harvest 8 Chemistry publications IPAS publications |
Files in This Item:
File | Description | Size | Format | |
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hdl_119226.pdf | Accepted version | 2.16 MB | Adobe PDF | View/Open |
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