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Semiconducting CuO Nanotubes: Synthesis, Characterization, and Bifunctional Photocathodic Enzymatic Bioanalysis
- Source :
- Analytical Chemistry. 90:5439-5444
- Publication Year :
- 2018
- Publisher :
- American Chemical Society (ACS), 2018.
-
Abstract
- This work reports the synthesis, characterization, and application of bifunctional semiconducting CuO nanotubes (NTs) electrode for innovative synergized cathodic photoelectrochemical (PEC) enzymatic bioanalysis. Specifically, CuO NTs electrode was fabricated by surface oxidation of the copper foil in an alkaline aqueous solution with (NH4)2S2O8 and then annealed in air at 200 °C. After the subsequent coupling with the model enzyme of xanthine oxidase (XOD), the resulted photocathodic enzyme biosensor exhibited good analytical performance of rapid response, high stability, and good sensitivity. Especially, due to the unique catalytic property of CuO toward H2O2, a novel enzymatic cascade design between biological catalyst (XOD as natural enzyme) and biomimetic catalyst (CuO as the peroxidase mimetics) was constructed, and the dual-catalyst system with special synergy effect could achieve the cathodic PEC guanine bioanalysis with enhanced efficiency. In the determination, the cathodic photocurrent was foun...
- Subjects :
- Xanthine Oxidase
Bioanalysis
Guanine
Biosensing Techniques
02 engineering and technology
010402 general chemistry
01 natural sciences
Analytical Chemistry
Catalysis
chemistry.chemical_compound
Bifunctional
Electrodes
Photocurrent
Nanotubes
Aqueous solution
Chemistry
Electrochemical Techniques
Photochemical Processes
021001 nanoscience & nanotechnology
0104 chemical sciences
Semiconductors
Chemical engineering
Electrode
0210 nano-technology
Biosensor
Copper
Subjects
Details
- ISSN :
- 15206882 and 00032700
- Volume :
- 90
- Database :
- OpenAIRE
- Journal :
- Analytical Chemistry
- Accession number :
- edsair.doi.dedup.....fc6333810f25736c8ae6df2757b3b0af
- Full Text :
- https://doi.org/10.1021/acs.analchem.8b00742