共查询到19条相似文献,搜索用时 593 毫秒
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近年来,利用LB技术制备电活性的有机超薄膜受到广泛的关注.导电LB膜的膜材料主要是含有受体化合物7,7’,8,8’-四氰基二亚甲基苯醌(TCNQ)的电荷转移复合物[1~3]以及给体分子[4,5],特别是四硫代富瓦烯(TTF)衍生物[6~8].尽管LB膜多由带长链的两亲性分子组装而成,但是对非两亲性TTF衍生物LB膜的研究[9~11]结果表明,引入长链烷基并非制备TTF类电荷转移复合物LB膜的先决条件.该结果极大地拓展了LB膜材料的研究范围.本文报道非两亲性TTF衍生物与花生酸混合导电LB膜的制备、结构表征与导电性能研究.1实验部分利用亚磷… 相似文献
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四硫富瓦烯衍生物/硬脂酸LB膜的表征 总被引:2,自引:0,他引:2
研究了四(苄硫基)四硫富瓦烯/硬脂酸(TBT-TTF/SA)(1:1)LB膜、二(亚乙二硫基)四硫富瓦烯/硬脂酸(BEDT-TTF/SA)(1:1)LB膜和四(十六烷硫基)四硫富瓦烯/硬脂酸(THT-TTF/SA)(1:1)LB膜的结构.从X射线衍射结果得到了LB膜的层间距离.X射线衍射图显示了TBT-TTF/SALB膜和BEDT-TTF/SALB膜的层间结构由硬脂酸控制.从偏振红外结果计算出硬脂酸和四硫富瓦烯衍生物在LB膜中的取向角.根据分子取向角确定了LB膜的层间结构.用分子长度和分子取向角得到的层间距离与从X射线衍射得到的层间距离相吻合. 相似文献
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有关LB膜中的Forst。r型共振能量转移已有不少报导,这种能量转移一般可发生在给体(D)和受体(川两者相距50-100A以上.所以,可以用F0rS比r公式对临界转移距离进行计算h-’1.而对LB膜中涉及三线态的分子间能量转移报导则不多见,此类能量转移是发生在6-15A之间.Yalnamo 相似文献
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胆红素LB膜的电化学行为研究 总被引:1,自引:0,他引:1
胆红素(BR)是存在于动物体内的一种重要生物物质,也是人和绝大多数哺乳动物体内血红蛋白等含铁卟啉化合物分解代谢的产物和代谢中间体。它是一种内源性抗氧化剂,对肝细胞的再生具有积极的作用,BR常以线状四吡咯或类卟啉结构的形式存在。胆红素及其金属配合物在水溶液犤1~6犦与有机介质(如DMF和DMSO)犤7~9犦中的电化学行为,文献上已有较多报道。前文犤10~12犦我们报道了胆红素可在不同亚相(酸性、中性及部分金属离子)表面形成Langmuir-Blodgett(LB膜);在有磷脂存在时,其成膜性能更佳犤13犦。由于LB膜同生… 相似文献
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电荷转移配合物薄膜制备方法和结构表征的研究进展 总被引:1,自引:0,他引:1
回顾了与Langmuir-Blodgett(LB)技术有关的电荷转移配合物薄膜的各类制备方法、结构表征结果,并比较了制备方法对薄膜结构的影响.例如,将LB膜C18H37TCNQ(电子受体)插入到电子给体3,3’,5,5’-tetramethylbenzidine(四甲基联苯胺, TMB)的石油醚溶液中进行掺杂,制备了TMB•C18H37TCNQ电荷转移配合物薄膜.在这种薄膜中,给体和受体以面对面的方式堆积,两者的环平面与基片平面接近垂直.而采用硬脂酸和C18H37TCNQ的混合LB膜通过类似的掺杂路线制备的TMB•C18H37TCNQ薄膜的结构发生了一些变化,例如其长的烃链C18H37更加垂直于基片平面.通过比较以前的各种实验结果可以得出以下结论:电荷转移配合物的结构可以通过制备方法得到控制. 相似文献
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YUAN Chun-Wei WU Hai-Ming XIAO Dong WEI YuDepartment of Biomedical Engineering Southeast University Nanjing Jiangsu China 《中国化学》1994,12(2):113-116
Langmuir-Blodgett (LB) films of N-docosylpyridinium-TCNQ (NDP-TCNQ) were prepared in air. The films deposited at the room temperature showed in-plane conductivity of 4×10-3 S.cm-1 and its absorption spectra in UV and IR regions resembled those for the films composed of mixed-valence TCNQ salts of NDP-(TCNQ)2 rather than for the NDP-TCNQ LB films preparaed under protection of nitrogen. In the case that the films left in a warm environment after each dipping cycle, the absorption in the corresponding region changed. Spectral analysis and XPS study revealed that more TCNQ molecules were produced. The oxidation of TCNQ- in air was considered to be the origin of neutral TCNQ formed. 相似文献
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Evaluation of Some Redox Mediators in the Design of Reagentless Amperometric Glucose Biosensor 下载免费PDF全文
Asta Kausaite‐Minkstimiene Viktor Mazeiko Almira Ramanaviciene Yasemin Oztekin Ali Osman Solak Arunas Ramanavicius 《Electroanalysis》2014,26(7):1528-1535
The influence of redox mediators (tetrathiafulvalene (TTF), tetrathiafulvalene‐tetracyanoquinodimethane complex (TTF‐TCNQ), phenazine methosulfate (PMS), 5,6‐diamino‐1,10‐phenonthroline (5,6‐DAP), potassium ferrocyanide (K4[Fe(CN)6]), methylene blue (MB) and toluidine blue (TB)) on the response of amperometric glucose biosensor was investigated in this research. Graphite rod electrode (GRE) modified by adsorbed mediator and glucose oxidase (GOx) cross‐linked with glutaraldehyde was served as working electrode. The highest amperometric signals were observed by using TTF and TTF‐TCNQ as mediators. The impact of amount of immobilized GOx, an optimal pH region for operation, stability and reproducibility of the analytic signal of designed biosensor using these mediators were investigated and discussed. 相似文献
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《Electroanalysis》2003,15(13):1115-1119
A novel electrocatalytic biosensor for glucose is reported that incorporate encapsulation of tetrathifulvalene‐tetracyanoquinodimethane (TTF‐TCNQ) functionalized organically modified sol gel glass (ormosil). The new ormosil is made using palladium‐linked glycidoxypropyltrimethoxysilane precursor, trimethoxysilane, HCl and TTF‐TCNQ powder at 25 °C. The ormosil is converted into fine powder and incorporated within graphite paste electrode along with glucose oxidase. The bioelectrochemistry of GOD and TTF‐TCNQ functionalized ormosil is examined based on cyclic voltammetry and amperometric measurements. A large electrocatalytic current to the order of 8000 μA/cm2 is recorded on the addition of 300 mM glucose. Typical responses of new biosensor are reported. The sensitivity of glucose analysis is found relatively much better as compared to earlier reported glucose biosensors. The role of palladium and TTF‐TCNQ introduction within ormosil and its advantages on bioelectrocatalysis are discussed. 相似文献
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P.N. Bartlett 《Journal of Electroanalytical Chemistry》1991,300(1-2)
Electrodes made from single crystals of tetrathiafulvalenium tetracyanoquinodimethanide (TTF. TCNQ) have been used to study the electrochemistry of the conducting organic salt and to investigate the mechanism of the electrochemical oxidation of glucose oxidase at conducting salt electrodes.The single crystal electrodes exhibit much lower non-Faradaic currents than the corresponding polycrystalline electrodes prepared as sublimed films or as pressed pellets. This leads to much lower background current levels and hence more clearly defined electrochemistry for solution species. Studies of the ac impedance behaviour and the electrochemistry of outer sphere redox species indicate that TTF·TCNQ electrodes behave as conventional metallic electrodes within their stable potential range.Results for the electrochemistry of glucose oxidase at the single crystal electrodes are inconsistent with a simple homogeneous mediation mechanism or with simple heterogeneous redox catalysis. Similarities with results obtained for TTF modified glucose oxidase suggest that the enzyme may undergo direct electrochemistry after modification by hydrophobic interaction with TTF molecules derived from the conducting salt electrode. 相似文献
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Akutagawa T Kakiuchi K Hasegawa T Nakamura T Christensen CA Becher J 《Langmuir : the ACS journal of surfaces and colloids》2004,20(10):4187-4195
Amphiphilic bis(tetrathiafulvalene) [bis(TTF)] macrocycles with four alkyl chains were fabricated as novel electrically active Langmuir-Blodgett (LB) films. Two TTF units were linked via [24]crown-8, [21]crown-7, and [18]crown-6 macrocycles, forming charge-transfer (CT) salts with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-p-quinodimethane (F4-TCNQ) at the air-water interface and on solid substrates. The CT salt of the amphiphilic bis(TTF)-macrocycle having a [24]crown-8 ring system formed a uniform surface morphology on mica. Using single-crystal X-ray structural analysis, the layer structure between the hydrophobic chains and the one-dimensional pi-pi stack of the CT salt was confirmed. Our results show that the bis(TTF)-macrocycle was folded at the flexible [24]crown-8 moiety, forming intramolecular pi-pi dimer structures and one-dimensional intermolecular pi-pi stacks with F4-TCNQ dimers. The open-shell electronic structure of the LB films was determined by electronic spectra, electrical conductivity, and electron spin resonance analyses. Asymmetry was introduced into the bis(TTF)-macrocycle by changing the ring size from [24]crown-8 to [21]crown-7. The surface morphology of the CT salts with F4-TCNQ was established as two-dimensional round-shape domains on mica. Further reduction of the macrocyclic ring from [21]crown-7 to [18]crown-6 resulted in a CT salt of the bis(TTF)-macrocycle with F4-TCNQ with a leaf-shape domain morphology and a typical dimension of approximately 1 microm2 on mica. In general, decreasing the macrocyclic ring size from [24]crown-8 to [21]crown-7 or [18]crown-6 affected the inter- and intramolecular interactions and the surface morphologies of LB films. 相似文献
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Lakhemici Kaboub Jean‐Marc Fabre Laure Vendier Jean‐Pierre Legros 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(8):o429-o432
A new bis‐TTF donor (TTF is tetrathiafulvalene) containing a pyridine diester spacer, namely bis{2‐[(6,7‐tetramethylene‐3‐methylsulfanyltetrathiafulvalen‐2‐yl)sulfanyl]ethyl} pyridine‐2,6‐dicarboxylate–tetracyanoquinodimethane–dichloromethane (2/1/2), 2C33H33NO4S12·C12H4N4·2CH2Cl2, has been synthesized and its electron‐donating ability determined by cyclic voltammetry. The electrical conductivity and crystal structure of this donor–acceptor (DA) complex with TCNQ (tetracyanoquinodimethane) as the acceptor are presented. The TCNQ moiety lies across a crystallographic inversion centre. In the crystal structure, TTF and TCNQ entities are arranged in alternate stacks; this feature, together with the bond lengths of the TCNQ molecule, suggest that the expected charge transfer has not occurred and that the D and A entities are in the neutral state, in agreement with the poor conductivity of the material (σRT = 2 × 10−6 S cm−1). 相似文献
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The adsorption and adlayer structures of tetrathiofulvalene (TTF), tetracyanoquinodimethane (TCNQ) and TTF-TCNQ on Au(111)
have been systematically investigated by in situ electrochemical scanning tunneling microscopy (ECSTM) and cyclic voltammetry in 0.1 mol L−1 HClO4. All the three molecules were found to form well-ordered adlayers in the double-layer potential region of Au(111). For TTF
and TCNQ adlayers, (6×3) and (4×7) structures have been observed, respectively. A structural transition was observed on TCNQ
adlayer at potential negative of 0.08 V vs. the reversible hydrogen electrode (RHE), and induced a new phase with (3 × 12) structure. On the other hand, the charge transfer complex, TTF-TCNQ, self-organized into ordered domains with a lamellar
structure different from those of the pure TTF and TCNQ adlayers on Au(111). Its packing arrangement was comparable to surface
structures of either single crystal or thin film of TTF-TCNQ.
Supported by the National Natural Science Foundation of China (Grant Nos. 20673121, 20733004 & 20821003), the National Key
Project for Basic Research (Grant Nos. 2006CB806101 & 2006CB932100) and Chinese Academy of Sciences 相似文献