共查询到19条相似文献,搜索用时 218 毫秒
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以TiO2纳米颗粒为前体,采用碱性水热法制备出钛酸盐纳米管(TNTs)与多壁碳纳米管(MWCNTs)的复合纳米材料(MWCNT-TNT);借助透射电子显微镜、傅立叶变换红外光谱仪和X射线衍射仪分析了纳米材料的结构、组成和形貌.将辣根过氧化酶,室温离子液体,Nafion和复合纳米材料共同修饰在电极表面组成酶电极,利用循环伏安法研究了该酶电极的电化学性能.结果表明,TiO2纳米颗粒完全转化为钛酸盐纳米管并且很好的与MWCNTs结合在一起;复合材料修饰酶电极的循环伏安行为明显优于TNTs修饰酶电极,表明引入MWCNTs可改善钛酸盐纳米材料的导电性以及电化学性能. 相似文献
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以对苯二酚为目标化合物比较研究了金纳米粒子、碳纳米管、金纳米粒子/碳纳米管3种纳米粒子修饰电极的电催化性能,结果发现:3种纳米粒子修饰电极均对对苯二酚的电化学信号具有增强作用。电化学阻抗谱和修饰层数试验表明:金纳米粒子的增强效果来自于金纳米粒子的电催化作用,碳纳米管的增强作用来自于电催化作用与大的电极表面积,金纳米粒子/碳纳米管复合修饰电极综合利用了两种纳米粒子的特性,表现出了更为优良的电催化行为。对苯二酚在修饰电极上的电化学过程均为扩散控制过程。 相似文献
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单壁碳纳米管修饰的高灵敏纳米碳纤维电极 总被引:7,自引:0,他引:7
碳纳米管已被应用于电极材料,但未得到良好的电化学伏安行为;且由于碳纳米管的直径很小(几到数十纳米),制作单根的碳纳米管电极非常困难,难以实际应用.碳纳米管用于修饰电极已得到更多重视,但都在常规尺寸(毫米级)的电极上进行,这样的电极不适于在生物微环境和毛细管电泳电化学检测中应用. 相似文献
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在玻碳电极上制备了碳纳米管负载纳米铂修饰电极(Pt-MWCNTs/GCE)。考察了联吡啶钌和富马酸酮替芬在3个不同电极上的电化学及其发光行为,并对其进行了对比。结果表明,在Pt-MWCNTs/GCE上富马酸酮替芬对联吡啶钌的电化学发光强度有明显的增敏作用,其增敏效果约为MWCNTs/GCE电极的2倍,约为裸玻碳电极的3.5倍,据此,建立了一种Pt-MWCNTs/GCE电极上电化学发光法检测富马酸酮替芬的新方法。在优化实验条件下,富马酸酮替芬的浓度在1.0×10-7~1.0×10-4mol/L范围内与其相对发光强度呈线性关系,线性回归方程为I=48.805×106c+221.03(r=0.9969),检出限为2.4×10-9mol/L,连续平行测定1.0×10-5mol/L的富马酸酮替芬溶液5次,发光强度的RSD为3.3%。对样品进行回收率实验,回收率为99%~104%,RSD为2.1%。 相似文献
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The electrocatalytic properties of multi-walled carbon nanotube modified electrodes toward the oxidation of NADH are critically evaluated. Carbon nanotube modified electrodes are examined and compared with boron-doped diamond and glassy carbon electrodes, and most importantly, edge plane and basal pyrolytic graphite electrodes. It is found that CNT modified electrodes are no more reactive than edge plane pyrolytic graphite electrodes with the comparison with edge plane and basal plane pyrolytic graphite electrodes allowing the electroactive sites for the electrochemical oxidation of NADH to be unambiguously determined as due to edge plane sites. Using these highly reactive edge plane sites, edge plane pyrolytic graphite electrodes are examined with cyclic voltammetry and amperometry for the electroanalytical determination of NADH. It is demonstrated that a detection limit of 5 microM is possible with cyclic voltammetry or 0.3 microM using amperometry suggesting that edge plane pyrolytic graphite electrodes can conveniently replace carbon nanotube modified glassy carbon electrodes for biosensing applications with the relative advantages of reactivity, cost and simplicity of preparation. We advocate the routine use of edge plane and basal plane pyrolytic graphite electrodes in studies utilising carbon nanotubes particularly if 'electrocatalytic' properties are claimed for the latter. 相似文献
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Electrodes modified with carbon nanomaterials find wide ranging applications in electrochemistry such as in energy generation and storage through to applications in electroanalysis. A substantial limitation is the presence of metallic impurities which vary between batches and can produce erroneous results. Consequently we have explored the electrochemical properties of metallic impurity free carbon nanotube paste electrodes using potassium ferrocyanide and hydrogen peroxide as model compounds. In terms of the latter utilising cyclic voltammetry, a linear range from 0.75 to 3 mM with a limit of detection of 0.19 mM is possible using the electrochemical oxidation of hydrogen peroxide while using the electrochemical reduction of the target analyte, a linear range from 0.5 to 249 mM is possible with a detection limit of 0.43 mM.The ultra-small size of the carbon nanotubes and fabrication methodology result in a tightly bound carbon nanotube electrode surface which does not exhibit thin-layer behaviour resulting in highly reproducible electrodes with the %RSD found to be 5.5%. These analytical ranges, detection limits and reproducibility are technologically useful.The carbon nanotubes utilised are completely free from metallic impurities and do not require lengthy processing to remove impurities and consequently have no variation in the purity of the nanomaterial between batches as is commonly the case for other available carbon nanotube material. The impurity free nature of this nanomaterial allows for highly reproducible and intelligent sensors based on carbon nanotubes to be understood and realised for the first time. 相似文献
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Electrocatalysis at graphite and carbon nanotube modified electrodes: edge-plane sites and tube ends are the reactive sites 总被引:3,自引:0,他引:3
Banks CE Davies TJ Wildgoose GG Compton RG 《Chemical communications (Cambridge, England)》2005,(7):829-841
Carbon, and particularly graphite in its various forms, is an attractive electrode material. Two areas of particular interest are modified carbon electrodes and carbon nanotube electrodes. In this article we focus on the relationship between surface structure and electrochemical and chemical reactivity of electrodes based on these materials. We overview recent work in this area which has led us to believe that much of the catalytic activity, electron transfer and chemical reactivity of graphitic carbon electrodes is at surface defect sites, and in particular edge-plane-like defect sites. We also question the claimed special "catalytic" properties of carbon nanotube modified electrodes. 相似文献
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Fatemeh Honarasa Maryam Zare Saeed Yousefinejad 《Russian Journal of Electrochemistry》2016,52(10):955-959
Recently, different carbon nanomaterials were introduced for construction of electrochemical sensors. In this study, the influence of carbon nanomaterial on performance of carbon paste potentiometric electrode was investigated. In this manner, different kinds of carbon nanomaterial, i.e., graphene, graphene oxide and carbon nanotube (CNT) were used as a conduction phase in carbon paste electrode. Then, potentiometric characteristics of the corresponding paste electrodes such as calibration slope, linear range, detection limit, response time and stability were compared with each other. The results appeared comprehensive findings about the role of electrode’s content in electrochemical performance. 相似文献
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《Electroanalysis》2017,29(2):548-558
In this work, graphene and multi‐walled carbon nanotubes were derivatised with anthraquinone (AQ) groups using spontaneous or electrochemical grafting of Fast Red AL salt. Glassy carbon (GC) electrodes were coated with AQ‐modified carbon nanomaterials to study the oxygen reduction reaction (ORR). These nanomaterials were characterised by X‐ray photoelectron spectroscopy and multilayer formation of AQ on the electrografted electrodes was observed. All the modified electrodes showed enhanced electrocatalytic activity towards the ORR in alkaline media. High AQ loading on the electrodes was found and the number of electrons transferred per O2 molecule was between 2 and 4. In addition, the stability testing of AQ‐derivatised carbon nanomaterial‐coated GC electrodes was performed. 相似文献
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Lee Yook Heng Alison Chou Jun Yu Ying Chen J. Justin Gooding 《Electrochemistry communications》2005,7(12):1457-1462
The modification of glassy carbon electrodes with random dispersions of nanotubes is currently the most popular approach to the preparation of carbon nanotube modified electrodes. The performance of glassy carbon electrodes modified with a random dispersion of bamboo type carbon nanotubes was compared with single walled carbon nanotubes modified glassy carbon electrodes and bare glassy carbon electrodes. The electrochemical performance of all three types for electrode were compared by investigating the electrochemistry with solution species and the oxidation of guanine and adenine bases of surface adsorbed DNA. The presence of edge planes of graphene at regular intervals along the walls of the bamboo nanotubes resulted in superior electrochemical performance relative to SWNT modified electrodes from two aspects. Firstly, with solution species the peak separation of the oxidation and reduction waves were smaller indicating more rapid rates of electron transfer. Secondly, a greater number of electroactive sites along the walls of the bamboo-carbon nanotubes (BCNTs) resulted in larger current signals and a broader dynamic range for the oxidation of DNA bases. 相似文献
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Louise Highton Rashid O. Kadara Norman Jenkinson Bill Logan Riehl Craig E. Banks 《Electroanalysis》2009,21(21):2387-2389
We demonstrate that metallic free carbon nanotube cluster modified screen printed electrodes provide an advantageous sensing methodology for nicotine. The electrochemical oxidation of nicotine is possible at low potentials compared to other commercially available carbon electrodes. Using the carbon nanotube cluster modified screen printed electrodes a detection range of 10 to 1000 μM is possible with a limit of detection of 2 μM. The sensing protocol is shown to be viable in artificial saliva and is promising as a portable and rapid sensor for nicotine in oral fluid (saliva) in areas such as health/life insurance, instances where smoking is banned and also as a point of care test to help improve smoking quit rates. 相似文献
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Definitive evidence is presented for the favourable electrochemical properties of carbon nanotube modified electrodes arising from the ends of SWNTs due to oxygenated carbon species in general, and carboxylic acid moieties in particular, produced during acid purification. 相似文献