Electrochemical Determination of Hydrazine at Gold and Platinum Nanoparticles Modified Poly(L-Serine) Glassy Carbon Electrodes

Abstract

L-serine monomer was polymerized electrochemically on a glassy carbon electrode by cyclic voltammetry. After L-serine polymerization, gold and platinum metal nanoparticles were doped by electrochemical reduction on the surface. The modified electrodes were characterized by Downloaded by [UQ Library] at 23:20 13 June 2015 2 using scanning electron microscopy and electrochemical impedance spectroscopy. The electrochemical behavior of hydrazine oxidation at the electrodes was investigated in 0.1 M pH 7.0 phosphate buffer. Hydrazine oxidation peaks were observed at 650, 399, 280, and 395 mV at the bare glassy carbon , poly(L-serine) modified glassy carbon, gold nanoparticle modified poly(L-serine) film glassy carbon electrode, and platinum nanoparticles modified poly(L-serine) film glassy carbon electrode, respectively. The most active surface towards hydrazine oxidation was the platinum nanoparticle modified poly(L-serine) film glassy carbon electrode with a 1045 mV negative potential shift and approximately three-fold higher peak current. The hydrazine oxidation peak was shifted to a 370 mV negative potential with a 2.5 times higher current at the gold nanoparticle modified poly(L-serine) film glassy carbon electrode compared to the bare electrode. The linear concentration ranges were from 1.0 to 1000 µM and 0.5 to 1000 µM for the gold nanoparticle modified poly(L-serine) film glassy carbon and the platinum nanoparticles modified poly(L-serine) film glassy carbon electrodes with limits of detections of 0.5 and 0.2 µM, respectively.

Electrochemical Determination of Dicofol at Nickel Nanowire Modified Poly(p‐aminophenol) Film Electrode

“…Recently, our group has published reports based on conducting polymer modified surfaces as catalytically active electrode materials. Antimony (III) determination with over‐oxidized poly (phenol red) film , hydrazine determination at Au−Pt nanoparticles modified poly L Serine , and at Pt nanoparticle‐poly bromocresol purple modified carbon nanotube electrode , oxygen reduction with Pt−Au/poly (p‐aminophenol) electrode , Au−Ag/poly(p‐aminophenol) film electrode for electrocatalytic oxidation of ammonia borane , overoxidized poly(p‐aminophenol) studied for determination of ascorbic acid, epinephrine and uric acid , Ag nanoparticles modified poly(thiophene) studied for the electroanalysis of caffeic acid , Cu/polypyrrole/GCE for dopamine and uric acid determination .…”

Over‐Oxidized Poly (Phenol Red) Film Modified Glassy Carbon Electrode for Anodic Stripping Voltammetric Determination of Ultra‐Trace Antimony (III)

“…Other alternative techniques for sensitive antimony determination are electroanalytical techniques especially stripping voltammetry since it offers several advantages such as simple, cheap and having portable instrumentation, rapid, sensitive and selective analysis of antimony ,,. Among the stripping voltammetric techniques, which are anodic stripping voltammetry (ASV), anodic stripping chronopotentiometry (ASC), cathodic stripping voltammetry (CSV), adsorptive cathodic stripping voltammetry (AdCSV), potentiometric stripping analysis (PSA), ASV has been known as influential techniques for the trace determination of metals or organic molecules without any separation.…”

Amperometric Electrochemical Platform for Hydrazine Determination Exploiting Reduced Graphene Oxide, Co(Salophen) and DNA: Application in Pharmaceutical Formulations Samples

“…[12][13][14][15] The electrochemical methods present some interesting properties in comparison to the previously Freitas et al 2097 Vol. 29, No.…”

“…[12][13][14][15] The electrochemical methods present some interesting properties in comparison to the previously presented non-electrochemical methods, since they do not require long preparing steps, analytical grade reagents or skilled operators for the analysis. In this sense, the electrochemical methods show excellent performance for the determination of electroactive species in biological and environmental samples with good sensitivity, selectivity, low cost and high throughput.…”