槲皮素在碳纳米管修饰碳糊电极上的电化学行为及测定

本文研究了槲皮素在多壁碳纳米管修饰碳糊电极上的电化学行为.实验结果表明:槲皮素在多壁碳纳米管修饰碳糊电极上的电极过程为一受吸附控制的两电子、两质子参与的准可逆过程,电子传递系数α=0.53.槲皮素的氧化峰电流与槲皮素浓度在1.0×10-7～6.0×10-3mol/L范围内呈良好的线性关系,可应用于槐花米中槲皮素含量测定.     

HA／CNTs陶瓷材料中CNTs极限含量和最佳含量的探讨

bk羟基磷灰石（Hydroxyapatite,HA）与碳纳米管（carbonnanotubes,CNTs）的热膨胀失配分析入手,分析了HA／CNTs陶瓷材料中碳管的极限含量,计算出碳管的极限含量为31．5vol％。通过实验研究了碳管含量对HA／CNTs陶瓷材料性能的影响。结果表明：当碳管含量为15v01％时,HA／CNTs陶瓷材料获得最佳的增韧效果;当碳管含量超过最佳值时,碳管在材料内部的团聚现象加重,引起材料的相对密度降低,气孔率增大,并导致材料的强度降低。     

Nafion/MWCNT复合修饰电极测定痕量锡的伏安法

研究了利用Nafion/多壁碳纳米管(MWCNT)复合修饰玻碳电极测定痕量锡的阳极溶出伏安法。结果表明,在pH值为1.2的NH4Cl—HCl电解液中,当Sn(Ⅳ)在Nafion/MWCNT复合修饰电极表面富集时间为3min,电位扫描速度为200mV/s时,该修饰电极在伏安图上能出现一灵敏的氧化峰,峰电位约为-570mV,利用该峰可以进行痕量锡的检测;峰电流与Sn(Ⅳ)浓度在4.0×10-8~1.0×10-6mol/L的范围内呈良好线性关系,相关系数为0.997,检出限为1.0×10-8mol/L;该修饰电极稳定性较好,用于实际水样中锡含量的测定,平均回收率为97.48%,所得结果令人满意。     

Electrical properties of carbon nanotubes in flowing vapor

1 Introduction a Among the numerous sensitive materials, carbon nanotubes (CNTs), both single and multiwalled, have been the focus of many studies recently [1,2]. In addition to high gas detection capability, it is established that CNT-based sensors opera…     

Acceleration sensing based on piezoresistive effect of carbon nanotube films

1 Introduction a Carbon nanotubes have attracted much attention due to their remarkable properties [1, 2]. One of their most important applications is to take advantage of their outstanding mechanical properties for their extreme flexibility and strength …     

电化学双层电容器中碳纳米管电极的化学法处理

Multi-walled carbon nanombes with homogeneous diameters （40 - 60 nm）, produced by chemical vapor deposition of hydrocarbon gas, are purified by nitric acids. Infrared and Raman studies indicate that oxygen containing surface groups, which are predominately carboxylic, phenolic and lactonic groups, are introduced into purified carbon nanotubes. Then three kinds of block-form porous tablets of carbon nanotubes are fabricated as electrodes in electrochemical double-layer capacitors. Using mounded mixture comprising carbon nanotubes and binder powders provides these tablets. Comparison of the effect of different processing on the structural performance of the capacitors is specifically investigated. Using chemically treated electrodes, electrochemical double-layer capacitors with a specific capacitance of about 33 F/g are obtained with 38 wt % H2SO4 as the electrolyte.     

采用改进的湿化学方法提纯多壁碳纳米管

采用改进的湿化学方法提纯多壁碳纳米管。在强酸回流处理多壁碳纳米管之前，在30％双氧水中超声分散多壁碳纳米管。提纯后的碳纳米管的纯度较高，而且分散性较好，为其后期应用奠定了基础。     

碳纳米管结构概述

本文通过对碳纳米管的分类的描述、碳纳米管的合成方法、碳纳米管结构的表征、不规则碳纳米管的结构和欧拉定律、多壁碳纳米管概述、单壁碳纳米管的管束及管束环、碳纳米管结构的稳定性以及碳纳米管结构的观察等8各方面 ,综述了碳纳米管的一般特点 ,同时提供了较详细的参考资料。文章重点描述了碳纳米管结构的表征。     

碳纳米管修饰电极对多巴胺的电催化

制备了羧基化多壁破纳米管修饰电极．考察了该电极在PH=5．4的0．2mol／L的KH2PO4-Na2HPO4磷酸盐缓冲溶液中的电化学行为．结果显示该电极对其电极上的反应具有明显的促进作用并对生物分子多巴胺具有明豆电催化作用．     

碳纳米豆荚的电子状态与电子特性--有关碳纳米管内嵌富勒烯的一些量子化学计算结果

本文提出了碳纳米管内嵌富勒烯形成碳纳米豆荚之电子结构及总能量的某些量子化学计算方法与结果，提供了有关碳纳米管内多种富勒烯内嵌热力学及内嵌所得碳纳米豆荚之电子结构。通过计算我们发现碳纳米豆荚的电子态依赖于碳纳米管内的空隙，并且这种空隙又反映了内嵌富勒烯的电子态。富勒烯的最低未占据态之能级以及富勒烯π态与碳纳米管内近自由电子态之间的杂化形成了碳纳米豆荚内多重载流子的电子特性。