Fabrication and Application of a Novel Modified Electrode Based on Multiwalled Nanotubes/Cerium(III) 12‐Tungstophosphoric Acid Nanocomposite

Abstract

A novel multiwalled nanotubes (MWNTs)/Cerium(III) 12-tungstophosphoric acid (CePW) nanocomposite film glassy carbon electrode was prepared in this paper. Electrochemical behaviors of the CePW/MWNTs modified electrode were investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). This modified electrode brought new capabilities for electrochemical devices by combining the advantages of carbon nanotubes, rare-earth, and heteropoly-acids. The results demonstrated that the CePW/MWNTs modified electrode exhibited enhanced electrocatalytic behavior and good stability for the detection of guanine and adenine in 0.1 M PBS (pH 7.0). The experimental parameters were optimized and a direct electrochemical method for the simultaneous determination of guanine and adenine was proposed. The detection limit (S/N ¼ 3) for guanine and adenine was 2.0 Â 10 À8 M and 3.0 Â 10 À8 M, respectively. Further, the acid-denatured calf thymus DNA was also detected and the result was satisfied.

Sensitive and Facile Determination of Catechol and Hydroquinone Simultaneously Under Coexistence of Resorcinol with a Zn/Al Layered Double Hydroxide Film Modified Glassy Carbon Electrode

“…As shown in Figure 2, on the bare glassy carbon electrode (curve a), there was almost a very small semicircle domain as was reported in literatures [32,33], implying a very low electron-transfer resistance to the redox-probe dissolved in the electrolyte solution. However, deposition of Zn/Al LDH film on the electrode surface caused the appearance of the semicircle portion at higher frequencies, and a line at lower frequencies.…”

“…Differential pulse voltammetry (DPV) was performed for the determination of dihydroxybenzene concentration under the optimized conditions to reduce the background current [33]. Either i pc or i pa of CA and HQ could be used as the analytical signal.…”

Polyoxometalates in Analytical Sciences

“…The (Table 2). [78][79][80][81][82][83] In addition, cysteine was determined based on its ability to reduce [P2Mo18O62] 6by using a stepwise injection spectrophotometric analyser, presenting a range of 9 μM -0.1 mM and a LOD of 3 μM. 84 Amperometric determination (0.…”

Calcium Salts of Tungstophoric Acid Supported on Silica as Novel Catalysts for Tetrahydrofuran Polymerization

“…Heteropolyacids have many applications in science researches [4][5][6][7] and industrial production [8], and it could also replace HF, H 2 SO 4 , and other traditional inorganic corrosive acids in the synthesis of polytetrahydrofuran in mild conditions [9,10]. Because of low specific area (\10 m 2 /g) and dissolution in polar solution, heteropolyacid is not easy to separate from the reaction mixture and its catalytic reaction stability is poor [11].…”