共查询到19条相似文献,搜索用时 78 毫秒
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在氧化铝模板中制备了HPA/PANI纳米线列阵,SEM、TEM表明列阵中纳米线直径约为80 nm;XRD与FT-IR证明形成了有效掺杂;单根纳米线的导电率为16.2 S.cm-1;材料的TG-DTA表明PANI纳米线材料有三步失重过程,失去吸附水过程,多酸失去结晶水和PANI结构持续分解过程,多酸结构分解过程;在氧化聚合过程中H4PMo11VO40即为质子酸又为氧化剂和掺杂剂;聚合反应采用自由基机理进行,掺杂反应发生在形成醌二亚胺式自由基正离子和双苯胺式自由基正离子和醌二亚胺式自由基正离子偶联聚合成链结构时. 相似文献
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以过硫酸铵(APS)为氧化剂,在无模板,无掺杂酸条件下,利用超声辅助合成了聚苯胺纳米管.通过透射电子显微镜、傅里叶红外光谱、紫外-可见光谱、X-射线衍射对产物的形貌、结构和性能进行了表征.研究表明,形成的聚苯胺纳米管内径约为10 nm,外径约为80 nm,长度约为26μm,且管径均匀.苯胺单体浓度越高,聚合速率越快.但是,聚苯胺的形貌与苯胺单体的浓度无关,而与苯胺和过硫酸铵的摩尔比有关.超声在纳米管的形成中起主要作用,它阻止球状胶束无规则团聚,使得在较高的苯胺浓度下(0.2 mol/L)也可形成纳米管.合成的聚苯胺电导率为5×10-3S·cm-1,结晶度不高. 相似文献
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单根聚苯胺纳米线导电性的研究 总被引:1,自引:0,他引:1
纳米线(管)的模板合成和导电原子力显微镜(C-AFM)结合是一种近期发展起来研究单根一维纳米结构及阵列导电性的有效方法. 本文利用C-AFM测量了阳极氧化铝(AAO)模板电化学合成制备的单根聚苯胺纳米线的电导率, 研究了直径、氧化还原态对单根聚苯胺纳米线电导率的影响. 从I-V曲线可以看到, 其导电性质与半导体类似,但又不同于半导体. 尚未观察到反向击穿现象,可能原因是, 在一定的反向偏压下的离子脱嵌使得它由部分氧化态(导电态)转变为还原态(绝缘态);电导率随纳米线直径减小而线性地增加;以ClO4-离子掺杂的氧化态和还原态比部分氧化态的电导率低二个数量级. 相似文献
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在前期工作的基础上, 利用导电原子力显微镜法测量单根聚苯胺纳米线的电导率, 探讨了聚苯胺纳米线(PANI nanowine)电导率的尺寸效应, 发现尺寸效应与纳米线的有序性有关. 相似文献
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水性聚苯胺纳米线超级电容器电极材料 总被引:1,自引:0,他引:1
使用"假高稀"方法,分别以过硫酸铵、硝酸铁和三氯化铁为氧化剂,含有1个乙氧基基团的酸性磷酸酯为质子酸,经过原位聚合制备了直径分别为78~90 nm、18~30 nm和16~25 nm水分散性聚苯胺纳米线.聚苯胺膜的电导率分别为18,32和35 S cm-1,比表面积为65,70和82 m2g-1.该聚苯胺纳米线能够很好地分散在水中,是一种环境友好型超级电容器电极材料.该电极材料在1 mol L-1四乙基氟硼酸/碳酸丙烯酯非水性电解液中,在-1~1 V扫描范围内,以0.4 A g-1的放电速率下,分别得到了110,140和152 F g-1的比容,比电容与材料的比表面积和电导率有关,随着比表面积以及电导率的增大而增大.聚苯胺纳米线电极材料有较高的充放电效率(大于98%),表明了它们有很好的电化学可逆性. 相似文献
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Marcos Malta Luiz Henrique Silva Andr Galembeck Mauro Korn 《Macromolecular rapid communications》2008,29(14):1221-1225
A single‐step sonochemical procedure to synthesize hybrid vanadium oxide/polyaniline nanowires starting from crystalline V2O5 and aniline in aqueous medium is presented. The synthesis explores the effect of high power ultrasounds on heterogeneous solid–aqueous phases, which leads to 30 nm width wires of 5 to 10 µm in length. Monomer intercalation and oxidative polymerization within the inorganic matrix proceed simultaneously with morphological changes. The electronic conductivity of hybrid nanowires reaches 0.8 S · cm−1 at room temperature.
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Introduction Many methods for the fabrication of nanoparticles have been developed ranging from lithographic techniques to chemical methods. The method termed template synthesis for preparation of a variety of micro- and nano-materials has been explored1-3. The template membranes employed contain cylindrical pores with mono-disperse diameters, that extend through the entire thickness of the membrane. The diameter of this nanocylinder is determined by the diameter of the pores of the template m… 相似文献
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Jianfeng Zang Chang Ming Li Xiaoqiang Cui Jianxiong Wang Xiaowei Sun Hua Dong Chang Q. Sun 《Electroanalysis》2007,19(9):1008-1014
ZnO nanowire was tailored both physically and chemically to immobilize the enzyme glucose oxidase (GOD) for construction of a glucose sensor with high performance, which was ascribed to its high specific surface area and high isoelectric point value for efficient immobilization of high concentration of acidic enzymes and the mediating effect by the redox reaction of ZnO nanowires. The apparent Michaelis constants Jmax, and KM were adjusted in a large scope by tailoring the thickness of the GOD/ZnO nanowire layer and the enzyme load in the nanowired network. Thus, a variety of linear region, sensitivities and reaction rates of the sensor could be easily achieved. Moreover, the glucose sensor showed long term stability with the incorporation of the inorganic zinc oxide nanowire. 相似文献
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Yang Yang Yongnan Zhao Jianguo Yu Yang Zhou Nan Pang Hao Su Sha Pang 《无机化学与普通化学杂志》2008,634(10):1780-1784
Two new open‐framework zincophosphites, Zn(H6C4N2S)(HPO3) (TJPU‐4) and [C6N2H14]·[Zn3(HPO3)4] (TJPU‐5) have been hydrothermally synthesized by using 2‐mercapto‐1‐methylimidazole [MMI] and 1,4‐diazabicyclo[2.2.2]octane [DABCO] as templates. TJPU‐4 crystallizes in monoclinic space group P21/c with the cell parameters a = 8.787(4) Å, b = 9.732(4) Å, c = 10.515(4) Å, β = 105.316(6)°, V = 867.3(6) Å3. The structure of TJPU‐4 is constructed by ZnO3S tetrahedron and HPO3 pseudo‐pyramid to generate a layer of 4, 8‐network in bc plane. The organic template locates on the both sides of the 8‐membered rings and bonds to zinc atom through Zn–S bond. TJPU‐5 crystallizes in the triclinic space group with cell parameters a = 9.294 (5) Å, b = 9.976 (5) Å, c = 9.986 (5) Å, α = 85.692 (7)°, β = 82.010 (7)° and γ = 80.184 (7)°, V = 902.1 (8) Å3. A novel 4488 cage is found in TJPU‐5. The connections of Zn(1)O4, Zn(3)O4 and HPO3 groups give rise to an infinite corner‐shared four‐ring chain. Using Zn(2)O4 as four connected bridges, linkages of these chains produce a 3‐D framework with intersecting 8‐ring channels running along [100], [010], [001], [011] and [111] directions. 相似文献
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以DNA为模板构造苯胺-DNA复合物纳米线和聚苯胺纳米导线 总被引:6,自引:0,他引:6
在溶液中, 以DNA为模板构造出了线性的苯胺-DNA复合物纳米线. 用压缩气流将得到的复合物纳米线拉直并固定到云母基底上. 用原子力显微镜(AFM)可观察到形貌规整的苯胺-DNA复合物纳米线. 苯胺单体在溶液中能从各个方向上组装到DNA分子上, 从而使DNA模板分子的表面包裹了一层苯胺. 以苯胺-DNA复合物纳米线为前驱体通过进一步化学氧化聚合得到了以DNA为模板的聚苯胺纳米导线. 相似文献
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模板法制备高度有序的聚苯胺纳米纤维阵列 总被引:19,自引:0,他引:19
近年来,利用化学或物理方法制备多种材料的纳米有序阵列复合结构已成为学术界的研究热点.用具有纳米孔洞的模板(多孔阳极氧化铝、多孔硅以及聚碳酸脂膜)制备的金属、半导体、碳纳米管等材料的纳米有序阵列复合结构已在润滑、微电极、单电子器件、传感器、垂直磁记录、场致电 相似文献
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The objective of this research was to use combustion synthesis to create a nano‐sized ZnO photocatalyst using citric acid as the fuel and zinc nitrate as the oxidant. The starting materials were mixed in a stoichiometric ratio, and a slurry precursor with high homogeneity was formed. The precursor was ignited at room temperature, resulting in dry, loose, and voluminous ZnO powders. The powders, characterized by SEM, TEM and XRD, showed a particle size range of 40 to 80 nm with a wurtzite structure. The ZnO powders were introduced as a photocatalyst for the degradation of methyl orange, which was adopted as a model compound. UV light (6W) was used as the irradiation source to induce synthesized ZnO powders to perform catalytic activity. The photocatalytic reaction was executed in 40 mL of a 10 ppm methyl orange aqueous solution under 254 nm UV illumination. In this work, it was observed that both UV light and ZnO powders are needed for the photocatalytic reaction. In addition, it was found that increasing the amount of ZnO powder present in the MO (methyl orange‐C14H14N3NaO3S) solution did not correlate directly with an increase in photocatalytic ability. It was found that the scattering problem of UV light also needs to be considered. The optimized photocatalytic degradation ratio in this work reached 92.7%. 相似文献
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Marcos Malta Guy Louarn Nicolas Errien Roberto M. Torresi 《Electrochemistry communications》2003,5(12):1011-1015
This contribution describes the synthesis of a hybrid nanocomposite constituted by vanadium oxide/polyaniline (PAni) with an interesting fibrilar morphology. Nanofibers can be obtained as main reaction products of nanocomposite V2O5/PAni and hexadecylamine after hydrothermal treatment. In general, nanocomposite nanofibers present a typical length varying from 1 to 10 μm and a width varying from 15 to 400 nm. Electrochemical experiments have shown a specific capacity of about 150 A h kg−1 during the 10 initials cycles, revealing a promissory material for utilization as cathode for ion-Li batteries. 相似文献