Unveiling the effect of the crystalline phases of iron oxyhydroxide for highly sensitive and selective detection of dopamine
- Authors
- Moolayadukkam, Sreejesh; Vishwanathan, Savithri; Jun, Byeongsun; Lee, Sang Uck; Matte, H. S. S. Ramakrishna
- Issue Date
- Oct-2021
- Publisher
- Royal Society of Chemistry
- Citation
- Dalton Transactions, v.50, no.38, pp 13497 - 13504
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- Dalton Transactions
- Volume
- 50
- Number
- 38
- Start Page
- 13497
- End Page
- 13504
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/110308
- DOI
- 10.1039/d1dt01672e
- ISSN
- 1477-9226
1477-9234
- Abstract
- Electrocatalysis is key to the development of several important energy and biosensing applications. In this regard, the crystalline phase-dependent electrocatalytic activity of materials has been extensively studied for reactions such as hydrogen evolution, oxygen reduction, etc. But such comprehensive studies for evaluating the phase-dependence of electrochemical biosensing have not been undertaken. Herein, three crystalline phases (alpha-, beta-, and gamma-) of iron oxyhydroxide (FeOOH) have been synthesized and characterized by spectroscopic and microscopy techniques. Electrochemical studies revealed their high sensitivity and selectivity towards dopamine (DA) detection. Amongst the three electrocatalysts, beta-FeOOH shows the highest sensitivity (337.15 mu A mM(-1) cm(-2)) and the lowest detection limit (0.56 mu M). The enhanced electrocatalytic activity of beta-FeOOH, as compared to that of alpha- and gamma-FeOOH, was attributed to its higher active site percentage and facile electrode kinetics. Furthermore, theoretical studies probed into the DA-FeOOH interactions by evaluating the charge transfer characteristics and hydrogen adsorption energies of the three phases to support the experimental findings.
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