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81.
Gold nanorods (GNRs) with suitable aspect ratio were synthesized with a template technique and then dispersed in a saturated sodium citrate solution by ultrasonication to form a GNR suspension. A GNR-modified electrode was fabricated using the GNR suspension. The oxidation of dopamine at the GNR/GC electrode exhibited surprisingly high electrocatalytic activity and adsorption-controlled characteristics. Square-wave voltammetry was used to detect dopamine. At the GNR/GC electrode, the linear concentration range of DA is from 1 × 10−8 M to 1 × 10−7 M and the detection limit (s/n = 3) is as low as 5.5 × 10−9 M. The current sensitivity is 3.280 μA/μM, and 1000-fold ascorbic acid (AA) cannot interfere with the determination of DA. All these performances are greatly superior to those of the bare GC electrode. 相似文献
82.
对未经化学抛光处理的Al进行阳极氧化得到阳极氧化铝模板,发现Al表面形成了条纹与多孔阵列共存的自组织结构,用原子力显微镜对这种结构进行了研究.借助Brusselator模型对条纹的形成机理进行了讨论,认为条纹图案是Al表面氧化层/电解液界面的Al2O3在整个反应过程中的生成和溶解两个过程相互竞争导致的,只有在特定的反应条件才会出现高度有序的结构.
关键词:
氧化铝模板(AAO)
原子力显微镜(AFM)
自组织条纹
Brusselator模型 相似文献
83.
Lead strontium titanate(Pb_xSr_(1-x))TiO_3(x=0.4,0.6) nanotubes were synthesized by sol-gel template method via spin coating.The structures and morphology of the as-prepared samples were characterized by X-ray diffractometry.scanning electron microscopy and transmission electron microscopy.X-ray photoelectron spectroscopy was used to determine the chemical composition of the sample and the valence state of elements.Raman spectroscopy of the as-prepared(Pb_xSr_(1-x))TiO_3(x=0.4,0.6) nanotubes at room temp... 相似文献
84.
采用水热法在多孔阳极氧化铝(AAO)模板上制备了NaGdF<,4>:Eu<'3+>(摩尔分数5.0%)/AAO薄膜,并研究了制备方法、溶液浓度和退火温度对薄膜样品形貌、结构和发光性质的影响.XRD结果表明,在低于500 ℃退火,得到具有NaGdF<,4>六方相结构的NaGdF<,4>:Eu<'3+>/AAO薄膜;而在5... 相似文献
85.
86.
Synthesis of highly ordered SnO2/Fe2O3 composite nanowire arrays by electrophoretic deposition method 总被引:1,自引:0,他引:1
LIJianjun ZHANGXingtang CHENYanhui LIYuncai HUANGYabin DUZuliang LITiejin 《科学通报(英文版)》2005,50(10):1044-1047
Highly ordered SnO2/Fe2O3 composite nanowire arrays have been synthesized by electrophoretic deposition method. The morphology and chemical composition of SnO2/Fe2O3 composite nanowire arrays are characterized by SEM, TEM, EDX, XPS, and XRD. The results show that the SnO2/Fe2O3 composite nanowires are about 180 nm in width and tens of microns in length, and they are composed of small nanoparticles of tetraganal SnO2 and rhombohedral α-Fe203 with diameters of 10-15nm. The SnO2/Fe2O3 composite nanowires are formed by a series of chemical reactions. 相似文献
87.
用电化学阳极氧化工艺,在草酸电解液中制备了3个系列的多孔阳极氧化铝(AAO)薄膜样品,分别考察了氧化电压、氧化时间以及电解液浓度对样品光致发光的影响.结果表明,AAO薄膜的光致发光发射谱(PL)和光致发光激发谱(PLE)的峰强随阳极电压的增加、氧化时间的延长及浓度的增大分别依次单调增强;阳极电压、氧化时间和电解液的浓度只对峰强起调制作用,并不改变发射谱和激发谱的峰位.分析了存在这种相关性的原因. 相似文献
88.
用模板法制备TiO2纳米线阵列膜及光催化性能的研究 总被引:21,自引:0,他引:21
用溶胶-凝胶技术在多孔阳极氧化铝模板的有序微孔内制备了高度取向的TiO2纳米线阵列膜光催化剂.用XRD,AFM和SEM等手段对样品进行了表征.结果表明,TiO2纳米线阵列膜晶型为锐钛矿,从AFM图像中可以看出TiO2纳米线线径分布均匀一致,取向性极好,直径与AAO模板的孔径大小一致.以其对吖啶橙的降解效果作为评价光催化活性的标准,与相同条件下制备的TiO2/玻璃膜相比,TiO2纳米线阵列膜具有很好的催化活性. 相似文献
89.
利用Ag离子与Br离子之间的化学沉积作用在孔隙中充满明胶的阳极氧化铝(AAO)模板中制备了AgBr/AAO纳米介孔复合材料.材料选择性曝光后,利用原位显影液对其进行化学显影,在AAO模板中选择性得到Ag纳米线阵列.实验结果表明:Ag纳米线是连续的、致密的,且具有多晶结构,充满了曝光部分的模板孔隙.本文还对影响Ag纳米线选择性生长的因素进行了简单讨论. 相似文献
90.
为了解决因受阳极氧化铝(AAO)孔道直径限制导致合成的金属纳米线尺寸单一、磁性受限的问题,采用二次阳极氧化法制备了不同孔径的阳极氧化铝(AAO)模板,依据模板辅助电沉积法,在不同孔径AAO模板内生长了Ni纳米线阵列,利用SEM,TEM,XRD和EDS等技术对制备的Ni纳米线阵列形貌、微观结构和成分进行表征,通过物理性能... 相似文献