Electrochemical incorporation of hemin in a ZnO-PPy nanocomposite on a Pt electrode as NO(x) sensor

An electrochemical NO(x) sensor was fabricated based on the incorporation of hemin on a ZnO-PPy nanocomposite modified Pt electrode. Scanning electron microscopy, energy dispersive X-ray analysis and cyclic voltammetry were used to confirm the successful stepwise assembly procedure for the sensor. T...

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Bibliographic Details
Published in:Analyst (London) 2012-12, Vol.137 (24), p.5874-5880
Main Authors: Prakash, Subash, Rajesh, Seenivasan, Singh, Sarkkarai Raja, Karunakaran, Chandran, Vasu, Veerapandy
Format: Article
Language:English
Subjects:
Chemistry Techniques, Analytical - instrumentation
Electrochemistry
Electrodes
Hemin - chemistry
Nanocomposites - chemistry
Nitrogen Oxides - analysis
Nitrogen Oxides - chemistry
Platinum - chemistry
Polymers - chemistry
Pyrroles - chemistry
Reproducibility of Results
Time Factors
Zinc Oxide - chemistry
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Summary:An electrochemical NO(x) sensor was fabricated based on the incorporation of hemin on a ZnO-PPy nanocomposite modified Pt electrode. Scanning electron microscopy, energy dispersive X-ray analysis and cyclic voltammetry were used to confirm the successful stepwise assembly procedure for the sensor. The electrocatalytical behavior of the sensor was investigated by cyclic voltammetry. The hemin-ZnO-PPy-Pt electrode exhibited characteristic hemin reversible redox peaks at 0.035 V and -0.11 V vs. Ag/AgCl respectively. The hemin-ZnO-PPy-Pt electrode exhibited 3-fold enhanced electrocatalytic activity towards NO(x) compared to the hemin-PPy-Pt electrode. The electrocatalytic response of the sensor was proportional to the NO(x) concentration in the range of 0.8 to 2000 μM (r(2) = 0.9974) with a sensitivity of 0.04 μA μM(-1) cm(-2) and detection limit of 0.8 μM for the hemin-ZnO-PPy-Pt electrode. The low detection limit, wide linear range and enhanced sensitivity of the present sensor make it valuable for potential applications. In addition, this sensor exhibited good reproducibility and stability.
ISSN:1364-5528
DOI:10.1039/c2an36347j