MilliporeSigma
  • Home
  • Search Results
  • Tungsten carbide nanotubes supported platinum nanoparticles as a potential sensing platform for oxalic acid.

Tungsten carbide nanotubes supported platinum nanoparticles as a potential sensing platform for oxalic acid.

Analytical chemistry (2014-07-16)
Thandavarayan Maiyalagan, Palanisamy Kannan, Martin Jönsson-Niedziolka, Joanna Niedziolka-Jönsson
ABSTRACT

Supported tungsten carbide is an efficient and vital nanomaterial for the development of high-performance, sensitive, and selective electrochemical sensors. In this work, tungsten carbide with tube-like nanostructures (WC NTs) supported platinum nanoparticles (PtNPs) are synthesized and explored as an efficient catalyst toward electrochemical oxidation of oxalic acid for the first the time. The WC NTs supported PtNPs modified glassy carbon (GC) electrode is highly sensitive toward the electrochemical oxidation of oxalic acid. A large decrease in the oxidation overpotential (220 mV) and significant enhancement in the peak current compared to unmodified and Pt/C modified GC electrodes have been observed without using any redox mediator. Moreover, WC NTs supported PtNPs modified electrode possessed wide linear concentration ranges from 0 to 125 nM and a higher sensitivity toward the oxidation of oxalic acid (80 nA/nM) achieved by the amperometry method. The present modified electrode showed an experimentally determined lowest detection limit (LOD) of 12 nM (S/N = 3). Further, WC NTs supported PtNPs electrode can be demonstrated to have an excellent selectivity toward the detection of oxalic acid in the presence of a 200-fold excess of major important interferents. The practical application of WC NTs supported PtNPs has also been demonstrated in the detection of oxalic acid in tomato fruit sample, by differential pulse voltammetry under optimized conditions.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, meets USP testing specifications
Sigma-Aldrich
Hydrofluoric acid, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥48%
Sigma-Aldrich
Sulfuric acid, ACS reagent, 95.0-98.0%
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, ACS reagent
Sigma-Aldrich
Hydrogen peroxide solution, 50 wt. % in H2O, stabilized
Sigma-Aldrich
Hydrofluoric acid, ACS reagent, 48%
Sigma-Aldrich
Sulfuric acid, puriss., meets analytical specification of Ph. Eur., BP, 95-97%
Sigma-Aldrich
Hydrogen Peroxide Solution, 30% (w/w), puriss. p.a., reag. ISO, reag. Ph. Eur.
Sigma-Aldrich
Hydrogen peroxide solution, purum p.a., ≥35% (RT)
Sigma-Aldrich
Sulfuric acid solution, puriss. p.a., ≥25% (T)
Sigma-Aldrich
Sulfuric acid, puriss. p.a., for determination of Hg, ACS reagent, reag. ISO, reag. Ph. Eur., 95.0-97.0%
Sigma-Aldrich
Hydrofluoric acid, puriss. p.a., reag. ISO, reag. Ph. Eur., ≥40%
Sigma-Aldrich
Water, HPLC Plus
Sigma-Aldrich
Water, suitable for HPLC
Sigma-Aldrich
Water, deionized
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 35 wt. % in H2O
Sigma-Aldrich
Water, ACS reagent
Sigma-Aldrich
Hydrofluoric acid, 48 wt. % in H2O, ≥99.99% trace metals basis
Sigma-Aldrich
Hydrogen peroxide solution, contains ~200 ppm acetanilide as stabilizer, 3 wt. % in H2O
Sigma-Aldrich
Hydrogen peroxide solution, contains potassium stannate as inhibitor, 30-32 wt. % in water, semiconductor grade, 99.999% trace metals basis
Sigma-Aldrich
Hydrogen peroxide solution, 30 % (w/w) in H2O, contains stabilizer
Supelco
Sulfuric acid, for the determination of nitrogen, ≥97.0%
Supelco
Hydrogen peroxide solution, ≥30%, for trace analysis
Sigma-Aldrich
Hydrogen peroxide solution, 34.5-36.5%
Sigma-Aldrich
Oxalic acid, ReagentPlus®, ≥99%
Sigma-Aldrich
Sulfuric acid, 99.999%
Sigma-Aldrich
Oxalic acid, 98%
Sigma-Aldrich
Water, deuterium-depleted, ≤1 ppm (Deuterium oxide)
Sigma-Aldrich
Water, for embryo transfer, sterile-filtered, BioXtra, suitable for mouse embryo cell culture
Sigma-Aldrich
Water, sterile-filtered, BioReagent, suitable for cell culture