Electrochemical detection of hydrogen peroxide at a waxed graphite electrode modified with platinum-decorated carbon nanotubes

Platinum-decorated carbon nanotubes(CNT-Pt) were produced by the chemical reduction method. A novel modified electrode was fabricated by intercalated CNT-Pt in the surface of waxed graphite,which provided excellent electrocatalytic activity and selectivity for both oxidation and reduction of hydrogen peroxide. The current response of the modified electrode for hydrogen peroxide was very rapid and the detection limits in amperometry are 2.5×10-6 mol/L at reduction potential and 4.8×10-6 mol/L at oxidation po...     

IR study on surface chemical properties of catalytic grown carbon nanotubes and nanofibers

In this study, the surface chemical properties of carbon nanotubes （CNTs） and carbon nanofibers （CNFs） grown by catalytic decomposition of methane on nickel and cobalt based catalysts were studied by DRIFT （Diffuse Reflectance Infrared Fourier Transform） and transmission Infrared （IR） spectroscopy. The results show that the surface exists not only carbon-hydrogen groups, but also carboxyl, ketene or quinone （carbonyl） oxygen-containing groups. These functional groups were formed in the process of the material growth, which result in large amount of chemical defect sites on the walls.     

激光轰击制备碳纳米管及其相关纳米材料

采用Nd：YAG脉冲激光在常温常压下轰击浸于乙醇流动相中的铁／石墨混合靶进行制备碳纳米管的研究。用傅立叶红外光谱、X射线衍射和透射电镜等现代分析技术分别对激光轰击所得产物进行表征。结果表明，以铁为催化剂，激光波长为1064nm，激光功率密度为4．5x10^9W/cm^2的条件下可成功制备碳纳米管，并且，透射电镜观察到所得的碳纳米管管径约为20～50nm，长度约几百nm，最长可达1μm以上。     

Differences of math anxiety groups based on two measurements,MASS and EEG

This article investigated how mathematic anxiety (MA) of Korean middle school students could be reduced by comparing analytically their cognitive neuroscience and questionnaire results. We developed a three-hour Complex Treatment Program (CTP) on quadratic functions for the study. In the summer of 2016, we collected data of the pre and post MA questionnaires by Mathematics Anxiety Scale for Students (MASS), the percent of correct answers (PCA) and reaction time (RT) by E-prime program, and also brain-imaging data of the event related potentials (ERP) by Electroencephalograph (EEG) using computer-based functional F-G model. The result indicated the CTP to be effective with the group with higher math anxiety and the group with higher achievement respectively. The MASS result was verified with the better performance of PCA on type G, which was measured by E-prime program. Some interesting patterns were revealed on brain-imaging data by EEG, indicating more brain activities with the MA groups.