Catalytic Behaviour of Transition Metal Cations In Electrosynthesis and Growth of Nanostructure Conducting Polypyrrole Films On/Between the Passive Cu Interdigital Electrodes: Application In Gas Sensors

The electrosynthesis of nanostructured polypyrrole (PPy) on copper interdigital electrodes (Cu‐IDEs) surfaces was performed by anodic oxidation of pyrrole in the presence of oxalic acid in aqueous solution (passivation technique) by potentiostatic method. Some divalent transition metal ions (Fe(II), Co(II), Ni(II), Cu(II), Zn(II)) as catalyst can be used to polymers growth on/between spacing between passive Cu‐IDEs by using potentiostatic technique. The morphology of the conducting films was examined by field emission scanning electron microscope, indicating a dependence of the film morphology to catalyst type. The PPy films on Cu‐IDEs were used to investigate the properties of the gas sensing ability.     

Characterization of Au Nanoparticle Film Electrodes Prepared on Polystyrene

Au nanoparticle films prepared on a polystyrene substrate were studied as a new electrode material. The films were formed from Au particles with different sizes (2–50 nm) and binder molecules (methanethiol, butanethiol, pentanethiol, hexanethiol and heptanethiol) on the substrate with a straightforward procedure. The electrode allows one to monitor reactions occurring only on the nanoparticles, and the catalytic currents resulting from small molecules such as hydrogen peroxide and organic amines were successfully detected in such a manner.     

The Catalytic Effect of Polypyrrole/Pt‐Cu on Oxygen Reduction Reaction

This paper studies the electrochemical properties of ppy/Pt‐Cu composite for oxygen reduction reaction (ORR) and compares it to the highly porous ppy/Pt‐Cu catalyst, which can be synthesized by galvanostatic method (ppy/Pt‐Cu(GS)). The results of the polarization, rotating disk electrode and electrochemical impedance tests are discussed to determine the electrochemical properties of the catalysts. According to the results, ppy/Pt‐Cu(GS) catalyst is more active toward ORR compared to ppy/Pt‐Cu catalyst. The rotating disk electrode data indicates four‐electron transfer mechanism for this catalyst.     

An Effective Non-Enzymatic Glucose Biosensor Based on Nanostructured CuxO/Cu Electrodes Synthesized in Situ by Copper Anodization

Potentiostatic anodization was developed to synthesize copper oxide/copper (Cu_xO/Cu, x=1,2) electrode with nano structure for sensitive non-enzymatic glucose detection. At a catalytic potential of 0.55 V, the CuO/Cu electrode presented a high sensitivity of 2954.38 μA mM⁻¹ cm⁻² to glucose and a linear range of 0.1 mM to 1.3 mM. The response time is less than 3 s with addition of 0.1 mM glucose. The CuO/Cu electrode above was anodized in 1M KOH solution at −100 mV and the morphology was compact nanoparticles and sparsely dispersed nanosheets, which enlarged the surface area and provided abundant electrocatalytic active sites. Compared the sensing property of electrodes with different morphologies, it indicated that nanostructure was significant to the efficient glucose catalytic oxidation process and it could be regulated by changing the potential and electrolyte concentration during anodization.     

Electrochemical Study of a Polypyrrole Film/Decanethiol Self-Assembled Monolayer on a Gold Electrode

Cyclic voltammetry and chronoamperometry were used to study the deposition of polypyrrole on a decanethiol self-assembled monolayer modified gold electrode (PPY/SAM/Au). The voltammetric behavior of the PPY/SAM film was investigated in the presence of several different electrolytes. It is found that the SAM shows great influence on the nucleation and growth of the PPY film. The reaction of the SAM and the anions causes the different voltammetric behavior of the polymerization of pyrrole on the modified electrode. Chronoamperometry shows the nucleation and growth of the PPY is initially inhibited but followed by a rapid increase. The SAM also influences electrochemical behavior of PPY film. Experiments show that the SAM can greatly depress the diffusion of anions in the PPY film, and minimize the background capacitance current.     

不同方法制备的纳米Au/NiO上CO常温常湿催化氧化性能的研究

CO的常温催化氧化过程在消除环境污染、空气净化、CO传感器、封闭式CO₂激光器、防毒面具以及密闭系统内CO的消除等方面都具有较高的实用价值.     

Ce掺杂对SnO2薄膜电学及气敏性能的影响

以无机盐ＳｎＣｌ２．２Ｈ２Ｏ（Ｎ４）３Ｃｅ（ＮＯ３）６为原料，无水乙醇为溶剂，采用溶胶－凝胶工艺制备了纯ＳｎＯ２及ＳｎＯ２：Ｃｅ薄膜。研究了ＳｎＯ２：Ｃｅ薄膜的热分解晶化过程和Ｃｅ掺杂和ＳｎＯ２薄膜的及气敏性能的影响，发现ＳｎＯ２：Ｃｅ薄膜在常温下对Ｈ２Ｓ气体具有较妇的敢敏性能，对ＳｎＯ２：Ｃｅ薄膜的结构进行了表征。