Fabrization And Application Of Polymer/noble Metal-nanoparticle Nanocomposites

The study of nanocomposite materials offers the possibility of substantial improvements in material properties , ranging from mechanical to funetional properties,with nanoparticles dispersed in polymer matrices. In this paper, some polymer and nanoparticles were introduced onto electrode for the electrochemical determination of contamination and amino acid. The main contents are listed as follows:1.An interesting mode of reactivity of gold nanoparticles (nano-Au) bonded with polythionine modified electrode in the presence of nitrite is reported. The modified electrode was characterized by search engine marketing,electrochemical impedance spectroscopy, cyclic voltammetry, and i-t amperometric curve. The nano-Au on polythionine modified electrode exhibited fast response towards nitrite with a detection limit of 0.023 M (S/N = 3) and a linear range of 0.16μM to 6.96 mM. Good storage stability, reproducibility, sensitivity, and anti-interference ability were obtained. The proposed method was successfully applied in the detection of nitrite in real samples.2 . Platinum nanoparticles (nano-Pt) and poly(o-aminophenol) (POAP) were fabricated onto the glassy carbon electrode(GCE) to form the nano-Pt/POAP/GCE for the electrochemical determination of L-cysteine. The POAP film was obtained through electrochemical polymerization of o-aminophenol on GCE. The nano-Pt was electrochemically deposited onto the surface of the activated POAP/GCE The resultant nano-Pt/POAP/GCE was characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), and showed excellent electrochemical response to L-cysteine at low oxidative potential in Britton-Robinson (BR) buffer solution (pH = 3.0), with good stability and sensitivity, and featured with a low detection limit (0.08μM,) and wide linear range (0.4μM⁶.3 mM).3.A biosensor for determining catechol and hydroquinone was fabricated with polymer and nanoparticles by electrochemical method. The poly(o- phenylenediamine) film was prepared through electrochemical polymerization o-phenylenediamine on a glassy carbon electrode (GCE) to form PoPD/GCE. The flower-like Pt was electrochemically deposited onto the surface of the activated PoPD/GCE. The modified electrode was used to electrochemically determination of catechol and hydroquinone simultaneously. It was characterized by scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. The enhanced electrocatalytic behavior and reversibility towards the oxidation of catechol and hydroquinone redox isomers in BR buffer solutions (0.04 M) with pH 7.0. The oxidation and reduction peak separation (â–³E) has been decreased. The differential pulse voltammograms in a mixture solution of catechol and hydroquinone have shown that the oxidation peaks became well resolved and are separated by about 112 mV, and the bare electrode gave a single broad oxidation peak. Moreover, the oxidation current of hydroquinone and catechol has been enhanced by a factor of two and four time. Using differential pulse voltammetry, a highly selective and simultaneous determination of hydroquinone and catechol has been explored at modified electrode. In comparison with other methods, it shows larger peak currents and different linear range. In the presence of 4×10^-5 M isomer, the linear concentration range of CC (or HQ) is 3.6μM to1.1mM (or 4.5μM to 1.2 mM), and the detection limits (S/N = 3) is 9.2×10^-7 M and 9.8×10^-7 M.