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...     

碳纳米管修饰碳糊电极测定水中痕量铅

提出了一种用多壁碳纳米管修饰碳糊电极,以差分脉冲伏安法测定水中痕量铅离子的方法。在优化的条件下,铅的脉冲峰电流与其浓度在2.0×10-9~8.0×10-7mol/L呈良好的线性关系,检测限为8.0×10-11mol/L。平行测定1.0×10-6mol/L的Pb2+,其标准偏差为0.372%(n=4)。用此法测定了水样中铅的含量,加标回收率为98.6%~103.6%。     

碳纳米管的生长机理

目前,对于碳纳米管成核及生长机理依然理解不充分,文章描述了碳纳米管在电弧蒸发法及激光蒸发法的生长过程。许多早期的模型都是假设在生长过程中有气相现象,但是有一个实验证据表明多壁碳纳米管和单壁碳纳米管两者的形成都包含有一个固态的转换。而在促进纳米管生长的过程中,升温速率好像也是一个重要的因素。     

碳纳米管负载单（双）核四硝基铁酞菁的制备和催化性能

制备出了碳纳米管负载单（双）核硝基铁酞菁,采用电化学手段研究了碳纳米管与金属酞菁的最佳配比,最佳热处理温度以及它们催化氧还原反应的动力学特征。结果表明：对于单核硝基铁酞菁而言,其与碳纳米管的最佳比例为2：3,而双核硝基铁酞菁与碳纳米管的最佳比例为1：4：样品的最佳热处理温度为500℃,催化剂催化氧还原反应的电极过程均受表面吸附所控制。     

碳纳米管储氢前后的势场分布研究

研究碳纳米管储氢前后的势场分布及其变化,揭示GCMC方法模拟碳纳米管储氢所得氢气分子形成一定分布的内在原因和碳纳米管吸附储氢过程.     

炭纳米管化学修饰电极测定槲皮素的研究

研究了槲皮素在多壁炭纳米管修饰电极上的伏安行为 ,其结果表明 ,在 0 .1mol·L- 1 磷酸盐介质 ( pH =5 .0 )中 ,该修饰电极对槲皮素产生较强的吸附催化作用 ,催化电流 (Ep =0 .2 6V ,vs .SCE)与槲皮素在浓度为 1 .0× 1 0 - 7mol·L- 1 ～ 6.0× 1 0 - 5mol·L- 1 范围内呈线性关系。本法用于芦丁水解产物的测定 ,效果良好。     

Silicon carbide nanotubes with special morphology prepared by super critical hvdrothermal method and photoluminescence character

Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 ℃ and 8 MPa have been reported in this paper.SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM).There are two kinds of silicon carbide with special morphology:One is oval SiCNTs with small aspect ratio,the other is bamboo cone-shape structure.SiCNTs have been analyzed by fluorescence spectrometer.The results indicate that the SiCNTs have strong photoluminescence (PL) property.The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube.The growth mechanism of silicon nanotubes has been proposed based on experiment data.The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure.     

Silicon carbide nanotubes with special morphology prepared by super critical hydrothermal method and photoluminescence character

Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 °C and 8 MPa have been reported in this paper. SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). There are two kinds of silicon carbide with special morphology: One is oval SiCNTs with small aspect ratio, the other is bamboo cone-shape structure. SiCNTs have been analyzed by fluorescence spectrometer. The results indicate that the SiCNTs have strong photoluminescence (PL) property. The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube. The growth mechanism of silicon nanotubes has been proposed based on experiment data. The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure.     

多壁碳纳米管修饰电极对抗坏血酸的电催化作用

用循环伏安法研究了在不同的电解质溶液及不同扫速下,多壁碳纳米管修饰电极对抗坏血酸(AA)的电催化作用。实验表明在MWCNT电极上,AA的氧化峰电位负移,氧化峰电流显著增加,AA的电极过程呈现扩散控制的特征,且AA浓度在1.0×10-5-5.0×10-1moL·dm-3范围内,其浓度与峰电流有良好的线性关系,检测下限达1.0×10-6moL·dm-3,一些常见物质对其测定无干扰。     

个体网络结构分析在科学交流活动中的应用研究——以碳纳米管领域的科学合作为例

 近年来,研究者们由对数据数量特征的关注转向加强对数据结构特征的分析,这一转向源于网络分析方法的兴起和成熟的网络测度方法的广泛运用。以个体网络为研究对象,结合网络结构分析的多种测度指标,对领域重要研究者,与重要研究者密切合作的学者及其结构特征等方面进行测量与分析,挖掘大量数据中隐藏的关系和结构。