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Yttrium hexacyanoferrate microflowers on freestanding three-dimensional graphene substrates for ascorbic acid detection

Hatamie, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1021/acsanm.9b00167
  3. Publisher: American Chemical Society , 2019
  4. Abstract:
  5. Recently, three-dimensional carbon nanostructures have attracted significant attention for biosensing applications. We have prepared highly porous three-dimensional graphene (3DG) structures (90% porosity) by template-assisted chemical vapor deposition technique and enhanced their electrocatalytic activity through in situ electrochemical deposition of rose-like yttrium hexacyanoferrate particles on their struts. The 3DG structure has an average channel size of ∼500 μm, and the microflowers have lateral sizes in the range of 2-10 μm. The performance of the 3DG-based electrode in efficient detection of ascorbic acid was investigated after transferring on a gold screen printed electrode (SPE). The sensor exhibits an electrocatalytic response as low as <5 s, a detection limit of 0.5 μM within a wide linear range up to 1.5 mM, and a fairly high sensitivity of 43.3 μA μM-1 cm-2. These electrochemical responses are superior to many other electrodes, particularly carbon materials, utilized for ascorbic acid detection. The developed sensor also shows good selectivity for ascorbic acid detection; no interference with other common electroactive inferences such as glucose, sucrose, and uric acid is obsereved. The potential application of the Y-modified 3DG sensor for detection of ascorbic acid in commercial juices as real samples is also shown. This novel nanocomposite structure may open a novel approach for the expansion of efficient electrochemical sensors based on commercial SPE. Copyright © 2019 American Chemical Society
  6. Keywords:
  7. Graphene-based sensor ; Yttrium hexacyanoferrate ; Chemical analysis ; Chemical vapor deposition ; Electrochemical deposition ; Electrochemical electrodes ; Electrochemical sensors ; Graphene ; Particle size analysis ; Reduction ; Yttrium ; Amperometric analysis ; Electrocatalytic activity ; Electrocatalytic response ; Electrochemical response ; Graphene-based sensors ; Hexacyanoferrates ; Screen printed electrodes ; Three-dimensional graphene ; Ascorbic acid
  8. Source: ACS Applied Nano Materials ; Volume 2, Issue 4 , 2019 , Pages 2212-2221 ; 25740970 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acsanm.9b00167