关于金纳米棒应用的研究进展

介绍了金纳米棒的物理和化学性质及应用新进展,重点综述了金纳米棒在自组装、金属离子检测、DNA检测、小分子及生物小分子检测方面的研究。展望了其广阔的发展和应用前景,对以后的研究重点和发展方向进行了讨论。     

金纳米棒重金属离子检测光谱法研究进展

综述了基于金纳米棒重金属离子的检测在光谱方面的研究进展,着重介绍了荧光光谱法和紫外光谱法,并对传感机理进行阐述。     

金纳米棒的合成及应用研究进展

金纳米材料具有特殊的物理、化学性质。与其他形状的金纳米材料相比,金纳米棒同时具有化学和光学方面的备向异性,在材料科学、局域表面等离子体共振（LSPR）传感、生物医学等领域存在着巨大的应用前景。文章系统的评述了金纳米棒的合成及应用进展。具体内容包括金纳米棒的合成、金纳米棒的光学特性、金纳米棒在LSPR传感分析方面的应用以及金纳米棒在生物医学方面的应用。     

纳米分子筛制备及其自组装体系的研究进展

纳米分子筛具有短而规整的孔道和较开放的晶穴,不仅在催化、离子交换和复合材料方面显示优异性能,而且在分子组装、光电磁功能纳米材料制备上也是一种优良的载体材料或宿主材料。对纳米分子筛的研究还利于从深层次了解分子筛的核化和生长机理。介绍了近年来纳米分子筛合成方法的研究进展,并对合成方法进行了分类综述,同时对纳米分子筛的特点及晶化机理进行归纳,进一步对纳米分子筛在催化反应中的应用及纳米自组装体系的新成果做了概述,指出了纳米分子筛研究的几个主要方向。     

自组装金纳米粒子薄膜SERS研究

采用静电自组装技术制备了金纳米粒子薄膜,研究了薄膜的表面增强拉曼散射(SERS)活性。自组装金纳米粒子薄膜具有明显的SERS效应,其中2双层薄膜的增强效应最强。金纳米粒子相互靠近但又不至于连通的状态具有最强的增强效果。若金纳米粒子通过点、面接触形成连通网络,将导致入射光激发表面等离子体波的机率下低,使增强效果降低。     

轮状病毒结构蛋白自组装修饰金纳米粒子

通过轮状病毒结构蛋白VP6自组装的方式对金纳米粒子进行了修饰,获得了VP6包覆的金纳米复合材料,改善了金纳米粒子的生物相容性,使其表面带有丰富的化学基团,更易在靶向药物输运、热疗及造影等方面获得新应用。     

纳米材料自组装合成技术研究进展

简要介绍了制备纳米材料的自组装技术的基本原理，概述了自组装合成方法，并对3种典型的自组装法的特点和研究现状进行了评述。     

液晶金纳米粒子的研究进展

液晶金纳米粒子是一类非常重要的功能材料。液晶金纳米粒子不仅能自组装成一维(1D)、二维(2D)和三维(3D)有序的定向排列还能增强液晶材料的导电性。液晶金纳米粒子在非线性光学、物理化学传感器和分子识别等领域有着广泛的应用前景。综述了近年来液晶硫醇金纳米粒子的研究进展。     

超声分散与离心处理纯化金纳米棒(GNR)

金纳米棒(GNR)具有良好的光、电、热等特性,在药物输送、肿瘤热疗、生化检测等方面具有非常广泛的应用,但获得高纯度的GNR比较困难.本研究采用无种子生长法合成GNR并结合超声分散和离心处理获得高纯度GNR.结果表明,生长液中CTAB浓度0.09 M,HAuCl4浓度为6.0 mM,AgNO3用量为0.22μL,AA用量...     

金纳米棒表面修饰技术及其功能化的研究进展

各向异性的金纳米棒由于具有独特的光学性质、较好的生物适应性,在生物医学领域得到了日益广泛的应用。本文系统评述了金纳米棒的表面修饰技术及其功能化的研究进展,内容包括:①金纳米棒的无机材料修饰,表面活性剂修饰、有机小分子及有机大分子修饰、金属材料修饰及其功能化;②金纳米棒在生物标记与识别、生物成像、癌症诊断和光热治疗等领域中的应用。     

基于相转化的金纳米棒表面修饰

利用种子生长法,以CTAB为表面活性剂制备的金纳米棒具有生物毒性.本研究利用相转化的方法修饰金纳米棒,修饰后金纳米棒的理化性质稳定,生物相容性更好,有更广的应用前景.     

金纳米棒合成及其影响因素的研究

利用种子生长法,通过改变体系中表面活性剂的比例或者硝酸银的量或者金种子的量,可制备出不同长径比(Aspect Ratio,AR)的金纳米棒.结果表明,通过改变表面活性剂的比例可以更好地制备出多种长径比的金纳米棒.     

金纳米棒的合成、光学特性、修饰及其在生物学中的应用

由于具有独特的光学和电子特性,金纳米棒受到人们越来越多的关注。金纳米棒的这些性质主要取决于它自身的形状、大小和长径比。尤其金纳米棒独特的、可调的表面等离子体共振特性,使其在生物标记、生物成像及生物医学等领域有非常广阔的应用前景。本论文详细介绍了金纳米棒的几种合成方法及其光学特性和金纳米棒的表面修饰手段,综述和比较了金纳米棒在生物分子探针技术、荧光探针和癌症诊断和光热治疗领域的研究进展,对其存在的问题做了具体分析并对金纳米棒在生物学中的应用方向进行了展望。     

Low temperature synthesis of TaB2 nanorods by molten‐salt assisted borothermal reduction

TaB₂ powders were synthesized by a molten‐salt assisted borothermal reduction method at 900°C‐1000°C in flowing argon using Ta₂O₅ and amorphous B as starting materials. The results indicated that the presence of liquid phase, such as B₂O₃ and NaCl/KCl, accelerated the mass transfer of reactant species and resulted in the complete finish of the reaction at low temperatures. The obtained TaB₂ powders exhibited a flow‐like shape assembled from nanorods grow along [001] direction or c‐axis. The morphology of the synthesized TaB₂ powders could be tailored by the amount of B₂O₃ or NaCl/KCl.     

水热还原法合成硒纳米棒及其机理研究

以亚硒酸为硒源,以葡萄糖为还原剂和稳定剂,水为溶剂,用水热还原法合成了单质硒纳米棒。考察了反应时间、温度对产物形貌的影响。结果表明,制得单质硒纳米棒的最佳反应条件为:180℃下水热24 h,可以得到结晶良好、粒径均一、表面光滑的棒状纳米结构,直径约为5μm,长约为200μm。同时,探讨了单质硒纳米棒的生长机理。     

Role of OH− in the low temperature hydrothermal synthesis of ZnO nanorods

BACKGROUND: ZnO nanorods, which have a wide range of applications, were grown on a Si substrate by low temperature hydrothermal synthesis. An understanding of the reaction mechanism of ZnO nanorods is crucial to control their growth kinetics. Therefore, the effect of OH^? concentration in a zinc sulfate solution on the growth of ZnO nanorods was investigated in order to better understand the growth mechanism of ZnO nanorods. RESULTS: The growth rate and diameter of ZnO nanorods were increased by increasing the pH of the zinc sulfate solution from 10.4 to 10.6, and the highest growth rate, 850 nm h^?1, was observed when the nanorods were grown in a solution with a pH of 10.6. However, further increase in the pH of the solution decreased the growth rate, due to the simultaneous dissolution of ZnO nanorods by OH^?. The amount of OH^? consumed by the dissolution of ZnO and other subreactions was minimized in a solution with a pH of 10.6. The intensity of c‐axis (0001) orientation was the highest in the solution with a pH of 10.6. CONCLUSION: It is concluded that the concentration of OH^? plays a critical role in the hydrothermal synthesis of ZnO nanorods, and that the suppression of OH^? subreactions increases the growth rate of ZnO nanorods. From the changes in the length and diameter of ZnO nanorods with synthesis time, it is suggested that the nucleation of ZnO nanocrystals occurs in the first 30 min, from which the growth of nanorods then proceeds. Copyright © 2007 Society of Chemical Industry     

Reflectance and SERS from an ordered array of gold nanorods

The optical properties of arrays of Au nanorods were studied by specular reflectance spectroscopy. The spectra were dominated by the surface plasmon modes of the Au nanoarrays superimposed on the effects of interference through the films. The longitudinal plasmon resonance moved to longer wavelength as the aspect ratio of the nanorods increased. The reflectance spectra were modelled by applying the Maxwell-Garnett approximation to a uniaxial thin film (composite Au/alumina) and this yielded a good match to the experimental data. SERS spectra on the Au nanorod arrays were recorded at different externally applied potentials and significant differences with respect to an electrochemically roughened Au electrode were revealed. These have been attributed to the nature of the composite nanoarrays, both their nanostructuring into rods and the regular arrangement of these rods.     

Using gold nanorods to enhance the current response of a choline biosensor

This present work describes the utilization of gold nanorods to create a highly responsive choline biosensor. Choline biosensors have been formed with choline oxidase (ChOx) immobilized in composite immobilization membrane matrix, which is composed of Au nanorods and polyvinyl alcohol (PVA) by a sol–gel method. Circular dichroism (CD) shows that the secondary structure of ChOx was preserved after conjugating with Au nanorods. The cyclic voltammograms (CVs) and electrochemical impedance spectroscopy (EIS) give the evidence that gold nanorods can improve the electrical conductivity of PVA-modified enzyme electrode. A set of experimental results indicates that the current response of modified electrode is several times larger than that without nanorods. The experimental conditions of biosensors are optimized, and the performance of the obtained electrodes with respect to linear range, reproducibility, response time, and stability is also presented.