Journal
MICROCHIMICA ACTA
Volume 186, Issue 12, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3837-3
Keywords
MXene; Bismuth; Microgrid electrochemical sensor; Micromilling; Heavy metal ions; Square wave anodic stripping voltammetry
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Funding
- National Key Research and Development Program of China [2018YFC1900105]
- National Program on Key Basic Research of China (973 Program) [2015CB258400]
- National Thousand Young Talents Program, Natural Science Foundation of China [51508213, 51608217, 21607046]
- Innovative and Interdisciplinary Team at HUST [0118261077]
- Independent Innovation Foundation of HUSTExploration Fund [2017KFYXJJ217, 2016YXMS291, 2016YXMS288]
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A delaminated MXene-bismuth (Bi@d-Ti3C2) nanocomposite was synthesized for the construction of a microgrid electrochemical sensor via mechanical milling. The Bi@d-Ti3C2 nanocomposite was synthesized by accumulation of Bi(III) on the surface of delaminated Ti3C2 nanosheets through electrostatic attraction and subsequent in-situ growth of bismuth nanorods. Under optimized experimental conditions, the sensor exhibits (a) linear responses to Pb(II), Cd(II) and Zn(II) in the concentration range from 1 to 20 mu g L-1, (b) well separated peak potentials at -0.54 V, -0.76 V and - 1.15 V vs. Ag/AgCl, (c) sensitivities of 0.98, 0.84 and 0.60 mu A L mu g(-1), and (d) detection limits of 0.2, 0.4 and 0.5 mu g L-1, respectively. This performance is attributed to the uniform dispersion of Bi nanorods on electrically conductive delaminated Ti3C2 MXene, and to the enhanced diffusion due to the microgrid structure.
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