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Highly Selective Nanostructured Electrochemical Sensor Utilizing Densely Packed Ultrathin Gold Nanowires Film
Author(s) -
Dervisevic Esma,
Dervisevic Muamer,
Wang Yan,
MalaverOrtega Luis F.,
Cheng Wenlong,
Tuck Kellie L.,
Voelcker Nicolas H.,
Cadarso Victor J.
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060071
Subject(s) - electrode , detection limit , materials science , electrochemistry , nanotechnology , selectivity , nanowire , electrochemical gas sensor , linear range , chemistry , chromatography , biochemistry , catalysis
Abstract The number of studies conducted about nonenzymatic electrochemical sensors has increased in recent years due to the development of more stable and robust electrodes using noble metals. One of the key aspects for achieving high sensing performance including detection limit and sensitivity is the design of electrode architecture. Herein, we report a new electrochemical sensing platform featuring ultrathin standing gold nanowires (AuNWs) for nonenzymatic detection of hydrogen peroxide (H 2 O 2 ). The use of AuNWs resulted in an increased electron transfer efficiency due to the higher active surface area compared to traditional gold film electrodes. This sensor demonstrates good selectivity, reproducibility, a linear range up to 49.5 mM of H 2 O 2 with a sensitivity of 0.185±0.003 mAmM −1 cm −2 and a limit of detection of 111 μM. The biological relevance of this sensor was tested in cell culture media to illustrate the performance of the proposed sensing electrode in complex biological media.