Issue 67, 2015

Polyelectrolyte stabilized bi-metallic Au/Ag nanoclusters modified electrode for nitric oxide detection

Abstract

In situ synthesis of bi-metallic Au/Ag nanoclusters (NCs) embedded in poly(acrylamide-co-diallyldimethylammonium chloride) (PADA) matrix and its application towards the detection of nitric oxide (NO) in nanomolar concentration range are reported. The cationic PADA matrix was used as stabilizer and support material for the preparation of bi-metallic Au/Ag NCs. The electrocatalytic oxidation and electrochemical sensing of NO were studied using the bi-metallic Au/Ag NCs modified electrodes. The modified electrode exhibited synergistic electrocatalytic activity, sensitivity and selectivity towards NO detection when compared to the mono-metallic Au and Ag nanostructures (NSs) modified electrodes. The present bi-metallic Au/Ag NCs modified electrode showed a sensitivity of 3.77 nA nM−1, a lowest experimental detection limit of 10 nM with S/N = ∼4.9, a fast response time (1 s) and a wide linear range of 10 nM to 0.9 μM towards the detection of NO. Selective sensing of NO was studied in the presence of NO3, CO2, NH3 and other common physiological interferences.

Graphical abstract: Polyelectrolyte stabilized bi-metallic Au/Ag nanoclusters modified electrode for nitric oxide detection

Supplementary files

Article information

Article type
Paper
Submitted
06 Apr 2015
Accepted
10 Jun 2015
First published
10 Jun 2015

RSC Adv., 2015,5, 54735-54741

Author version available

Polyelectrolyte stabilized bi-metallic Au/Ag nanoclusters modified electrode for nitric oxide detection

P. Viswanathan, S. Manivannan and R. Ramaraj, RSC Adv., 2015, 5, 54735 DOI: 10.1039/C5RA06098B

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