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71.
72.
Liping Heng Jin Zhai Yong Zhao Jinjie Xu Xianliang Sheng Lei Jiang 《Chemphyschem》2006,7(12):2520-2525
A light-emitting poly (distyryldimethylbenzene-co-triethylene glycol) rod-coil block copolymer was used to fabricate films with three-dimensionally ordered honeycomb structures by the breath-figure method. Photocurrent generation and photovoltaic performance are studied, and the dependence of photocurrent on applied electric field is investigated. Introducing the ordered porous structure significantly improves the photoelectric conversion behavior, because porous structures not only enhance the light-harvesting efficiency but also benefit charge separation and charge transfer. This phenomenon may have great prospects for enhancing the photovoltaic behavior of organic thin-film devices. 相似文献
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在 pH 4.5 HAc-NaAc缓冲溶液中,钍试剂分别于- 0.36 V、- 0.60 V产生两个灵敏的极谱波。基于钒对溴酸钾氧化钍试剂的催化作用,建立了双极谱波测量的催化动力学极谱法。钒浓度在0.7~15μg/L与△I(△I1+ I2)呈线性关系,检测限为0.5μg/L。研究了极谱波性质及电极反应机理。本法简便、灵敏、准确,已用于直接测定水中痕量钒。 相似文献
75.
A new Fe(III)-imprinted amino-functionalized silica gel sorbent was prepared by a surface imprinting technique for selective solid-phase extraction (SPE) of Fe(III) prior to its determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). Compared with non-imprinted polymer particles, the ion-imprinted polymers (IIPs) had higher selectivity and adsorption capacity for Fe(III). The maximum static adsorption capacity of the ion-imprinted and non-imprinted sorbent for Fe(III) was 25.21 and 5.10 mg g−1, respectively. The largest selectivity coefficient of the Fe(III)-imprinted sorbent for Fe(III) in the presence of Cr(III) was over 450. The relatively selective factor (αr) values of Fe(III)/Cr(III) were 49.9 and 42.4, which were greater than 1. The distribution ratio (D) values of Fe(III)-imprinted polymers for Fe(III) were greatly larger than that for Cr(III). The detection limit (3σ) was 0.34 μg L−1. The relative standard deviation of the method was 1.50% for eight replicate determinations. The method was validated by analyzing two certified reference materials (GBW 08301 and GBW 08303), the results obtained is in good agreement with standard values. The developed method was also successfully applied to the determination of trace iron in plants and water samples with satisfactory results. 相似文献
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We report the observation and characterization of a series of stable bimetallic 18-valence-electron clusters containing a highly symmetric 12-atom icosahedral Au cage with an encapsulated central heteroatom of Group VB transition metals, M@Au(12) (-) (M=V,Nb,Ta). Electronic and structural properties of these clusters were probed by anion photoelectron spectroscopy and theoretical calculations. Characteristics of the M@Au(12) (-) species include their remarkably high binding energies and relatively simple spectral features, which reflect their high symmetry and stability. The adiabatic electronic binding energies of M@Au(12) (-) were measured to be 3.70+/-0.03, 3.77+/-0.03, and 3.76+/-0.03 eV for M=V, Nb, and Ta, respectively. Comparison of density-functional calculations with experimental data established the highly symmetric icosahedral structures for the 18-electron cluster anions, which may be promising building blocks for cluster-assembled nanomaterials in the form of stoichiometric [M@Au(12) (-)]X(+) salts. 相似文献
79.
光纤生物传感器用于核酸的特异性检测 总被引:15,自引:2,他引:15
为了利用光纤传感器实现对细菌核酸分子的特异性和相对快速检测,我们使用直径1mm的石英光纤和635nm激光二极管,利用倏逝波原理制作了光纤生物传感器。光纤经过处理后产生醛基化基团,然后与核酸分子进行共价结合。通过3个实验来验证传感器的特异性和灵敏度。蒌光素溶液直接检测,使用互补模式寡核苷酸分子(25mer)进行核酸杂交模式实验和设计嗜肺军团菌一段特异性探针一 光标记嗜肺军团菌染色体DNA杂交。结果表明:光纤检测荧光素的灵敏度可达0.01mmol/L,而生物芯片扫描仪最低可检测到1nmol/L的荧光素;模式寡 核苷酸杂交表明:光纤传感器可以特异地检出目的核酸分子,灵敏度可达纳克级水平;染色体杂交结果显示在正常检测浓度下,光纤检测军团菌之信噪比达到了6:1,同时具有较好的特异性。检测时间约需要3-4h。我们构建的光纤生物传感器可以用于核酸分子的特异性检测,并且具有较好的灵敏度,对光纤表面修饰、样品处理和杂交过程的优化可望使之应用于实际标本的检测。 相似文献
80.
Wei F Chen C Zhai L Zhang N Zhao XS 《Journal of the American Chemical Society》2005,127(15):5306-5307
Conventional single nucleotide polymorphism (SNP) assays, which based their detection on the stringency or temperature of the washing buffers, have encountered difficulties to distinguish a single base pair mismatch from a perfect match. In this study, scanning potential hairpin denaturation (SPHD) has been developed to detect SNP in a sensitive and reliable manner. Combined with hairpin oligonucleotide probes, scanning surface electric potential was used to induce a dissociation of double-stranded DNA around a unique "melting potential" (Vm), and it generated a high-contrast SNP recognition signal. A 21 base pair p53 gene segment was used to test this novel method. A single nucleotide mismatch to the hairpin probes caused an average of 400-800 mV difference in melting potential against the perfect match, while the error of this assay was lower than 20 mV. Experiments demonstrated that the hairpin stem was critical to the method. The concept of scanning potential hairpin denaturation could also be used extensively in different areas of nucleotide hybridization based assays. 相似文献