Abstract
Carbon nanotube-encapsulated nickel selenide composite nanostructures were used as nonenzymatic electrochemical sensors for dopamine detection. These composite nanostructures were synthesized through a simple, one-step, and environmentally friendly chemical vapor deposition method, wherein the CNTs were formed in situ from pyrolysis of a carbon-rich metallo-organic precursor. The composition and morphology of these hybrid NiSe2-filled carbon nanostructures were confirmed by powder X-ray diffraction, Raman, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy images. Electrochemical tests demonstrated that the as-synthesized hybrid nanostructures exhibited outstanding electrocatalytic performance toward dopamine oxidation, with a high sensitivity of 19.62 μA μM-1 cm-2, low detection limit, broad linear range of 5 nM-640 μM, and high selectivity. The synergistic effects of enhanced electrochemical activity of nickel selenide along with the enhanced conductivity of carbon nanotubes led to the high electrocatalytic efficiency for these nanostructured composites. The high sensitivity and selectivity of this nanostructured composite could be exploited to develop simple, selective, and sensitive electrochemical sensors to detect and quantify dopamine in human tear samples with high reliability. This nanotube-encapsulated sensor, hence, paves the way for discoveries in the development of dopamine sensors with low cost and high stability, which can be used for noninvasive dopamine detection in peripheral bodily fluids.
Recommended Citation
H. Singh et al., "Highly Efficient Dopamine Sensing With A Carbon Nanotube-Encapsulated Metal Chalcogenide Nanostructure," ACS Applied Nano Materials, vol. 7, no. 5, pp. 4814 - 4823, American Chemical Society, Mar 2024.
The definitive version is available at https://doi.org/10.1021/acsanm.3c05422
Department(s)
Chemical and Biochemical Engineering
Second Department
Chemistry
Keywords and Phrases
carbon nanotube composites; dopamine oxidation; dopamine sensor; metal chalcogenide nanostructures; nonenzymatic biosensor
International Standard Serial Number (ISSN)
2574-0970
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Chemical Society, All rights reserved.
Publication Date
08 Mar 2024
Comments
National Science Foundation, Grant CAS-2155175