کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6477081 | 1426592 | 2016 | 4 صفحه PDF | دانلود رایگان |
- Nanoporous gold is formed on microelectrode by simple electrochemical treatment.
- Bare gold microelectrodes are treated by oxidation reduction cycles in acidic media.
- Large double-layer capacitance is observed in the voltammogram.
- Surface area is 27 times higher than that of the bare electrode (Rf = 49).
We fabricated nanoporous gold (NPG) on a microelectrode by oxidization and reduction cycles (ORCs) in acidic media. The typical morphology of the nanostructures comprised tangled thickets of branched nanowires with diameters of 20-30 nm. Furthermore, the surface area was significantly increased compared with the bare electrode. The roughness factor (Rf) of NPG could be controlled by changing the number of ORCs. The NPG-modified microelectrode with a roughness factor of 49 could immobilize 11 times more thiol-modified oligodeoxynucleotides on its surface than a microelectrode without NPG (Rf = 1.8). The results suggest that NPG formation is an important method for enhancing the electrochemical sensitivity of microelectrodes.
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Journal: Journal of Electroanalytical Chemistry - Volume 783, 15 December 2016, Pages 188-191