Journal
ELECTROPHORESIS
Volume 40, Issue 20, Pages 2699-2705Publisher
WILEY
DOI: 10.1002/elps.201900169
Keywords
AC electrokinetics; Capacitive sensing; Cu2+ detection; l-cysteine
Funding
- Anhui Provincial Natural Science Foundation [1908085MF180] Funding Source: Medline
- National Natural Science Foundation of China [61674048] Funding Source: Medline
- the National Natural Science Foundation of China [61674048] Funding Source: Medline
- Key Laboratory of MEMS of the Ministry of Education Funding Source: Medline
- University of Tennessee Funding Source: Medline
- the National Key R&D Program of China [2017YFC1600603] Funding Source: Medline
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Copper is an indispensable trace element for human health. Too much or too little intake of copper ion (Cu2+) can lead to its own adverse health conditions. Therefore, detection of Cu2+ is always of vital importance. In this work, a simple sensor was developed for rapid detection of trace Cu2+ in water, in which L-cysteine (Cys) as a molecular probe was self-assembled on a gold interdigital electrode to form a monolayer for specific capture of Cu2+. The interfacial capacitance of interdigital electrode was detected to indicate the target adsorption level under an AC signal working as the excitation to induce directed movement and enrichment of Cu2+ to the electrode surface. This sensor reached a limit of detection of 4.14 fM and a satisfactory selectivity against eight other ions (Zn2+, Hg2+, Pb2+, Cd2+, Mg2+, Fe2+, As3+, and As5+). Testing of spiked tap water was also performed, demonstrating the sensor's usability. This sensor as well as the detection method shows a great application potential in fields such as environmental monitoring and medical diagnosis.
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