Herdman, Karen and Breslin, Carmel B. and Finnerty, Niall J.
(2018)
The aqueous deposition of a pH sensitive quinone on carbon paste electrodes using linear sweep voltammetry.
Journal of Electroanalytical Chemistry, 828.
pp. 137-143.
ISSN 1572-6657
Abstract
Herein, we report the electrodeposition of a quinone containing diazonium salt onto the surface of carbon paste
electrodes (CPE). An extensive characterisation revealed the optimum deposition characteristics to be obtained
using Linear Sweep Voltammetry (LSV) over the potential range +400 mV to −800 mV vs. SCE at 100 mV/s, for
five sweeps in 0.1 M H2SO4. The corresponding FBRR-modified CPE was cycled in phosphate buffered saline over
the potential range +800 mV to −700 mV vs. SCE at 100 mV/s. The anodic peak potential demonstrated excellent stability over 400 cycles and a Nernstian response was recorded (−59 ± 3 mV/pH, n = 39, r2 = 0.99).
The continuous monitoring of pH changes within the same solution exhibited Nernstian behaviour also, confirming the efficacy of the FBRR-modified CPEs for in situ pH monitoring. An extensive shelf-life investigation
identified retention of FBRR-modified CPEs sensitivity over 28 days when stored under air conditions at 4 °C. The
work described within confirms the effectiveness of FBRR-modified CPEs to perform continuous pH monitoring
over a small pH range of physiological relevance.
| Item Type: |
Article
|
| Keywords: |
Continuous pH monitoring;
Linear sweep voltammetry;
Carbon paste electrodes;
Nernstian response;
Shelf-life; |
| Academic Unit: |
Faculty of Science and Engineering > Chemistry |
| Item ID: |
13104 |
| Identification Number: |
https://doi.org/10.1016/j.jelechem.2018.09.049 |
| Depositing User: |
Dr. Carmel Breslin
|
| Date Deposited: |
25 Jun 2020 16:07 |
| Journal or Publication Title: |
Journal of Electroanalytical Chemistry |
| Publisher: |
Elsevier |
| Refereed: |
Yes |
| URI: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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