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Al3+ ion sensing at attomole level via surface-potential mapping of gold nanoparticle complexes

Authors
Kim, WoongLee, GyudoKim, MinwooPark, JoohyungJo, SeongjaeYoon, Dae SungPark, Youngja H.Hong, JunghwaPark, Jinsung
Issue Date
2월-2018
Publisher
ELSEVIER SCIENCE SA
Keywords
Attomole; Label-free; Aluminum ions; Nanotoxicity; Gold nanoparticle; Surface potential; Real sample
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.255, pp.2179 - 2186
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
255
Start Page
2179
End Page
2186
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/77907
DOI
10.1016/j.snb.2017.09.031
ISSN
0925-4005
Abstract
Aluminum can be ionized in water by reacting with chlorides. Aluminum ions (Al3+) are believed to be very harmful to human health and are associated with Alzheimer's disease. The detection of Al3+ is extremely important, but conventional methods suffer from low sensitivity and cumbersome processes. Herein, we report ultra-sensitive and label-free detection of Al3+ using gold nanoparticles (AuNPs) and Kelvin probe force microscopy (KPFM). Al3+ was exposed on citrated AuNPs with different concentrations; Al3+/AuNP complexes were constructed via binding interactions between Al3+ and the citrates. By probing the Al3+/AuNP complexes, we quantified the degree of interactions between Al3+ and the citrated AuNPs using KPFM. As the Al3+ concentration decreased, KPFM succeeded in exhibiting ultra-sensitive detection as low as 2 amol (limit of detection 1 pM, single droplet 2 mu L). We tested real samples from a sheet of aluminum foil, and detected similar to 748 amol (similar to 374 pM, single droplet 2 mu L) Al3+. The results indicate that the combination of AuNPs and KPFM offers a robust, facile, and an ultra-sensitive platform technology for detecting Al3+. (C) 2017 Elsevier B.V. All rights reserved.
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Graduate School > Department of Biotechnology and Bioinformatics > 1. Journal Articles
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College of Pharmacy > Department of Pharmaceutical Science > 1. Journal Articles
Graduate School > Department of Control and Instrumentation Engineering > 1. Journal Articles

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