多孔氧化铝膜上自组织生长Sn纳米点阵列的研究

以多孔阳极氧化铝膜(porous anodic alumina, PAA)为基片，采用真空电子束蒸发的方法在多孔氧化铝膜上制备了高度有序度的Sn纳米点阵列.锡纳米点阵的XRD与块体锡的完全相同，扫描电镜(SEM)测试结果表明，所制备的金属Sn纳米点阵与阳极氧化铝膜的多孔阵列具有完全相同的有序结构，阵列中每个Sn纳米粒子的形状为球形的，其直径接近于PAA膜的孔直径.对Sn纳米点阵形成过程和形成机理进行了讨论.     

含钴阳极氧化铝膜的磁致偏光特性

用电化学法制备了高度有序的多孔阳极氧化铝模板,选用CoSO4溶液为电解液,用交流电化学沉积法在多孔阳极氧化铝的柱形微孔内制备含钴纳米线有序阵列.分别用扫描电镜(SEM)、X射线衍射仪对多孔阳极氧化铝模板和纳米线阵列的微观形貌和结构进行分析,结果显示阳极氧化铝膜内确有钴生成,且钴纳米线中的晶粒在生长过程中有(100)晶面...     

铜钴合金纳米有序阵列的光学特性

用电化学法制备了高度有序的多孔阳极氧化铝模板, 选用CoSO4和CuSO4的混合溶液为电解液,用交流电化学沉积法在多孔阳极氧化铝的柱形微孔内制备铜钴合金纳米线有序阵列.分别用扫描电镜(SEM),X 射线衍射仪(XRD)对多孔氧化铝模板和纳米线阵列的微观形貌和结构进行分析.结果显示,制备的合金纳米线表面光滑、均匀,纳米线中的晶粒在长过程中有(111) 晶面的择优取向.用UV3101分光光度计测试了铜钴合金多孔铝复合结构的透射光谱及偏振光谱表明,合金纳米复合结构在可见及近红外波段具有良好的透射比和消光比;铜钴合金纳米复合结构的确能够改善单一金属的特性,比如在近红外光区,其消光比(30 dB)优于铜纳米复合结构(17 dB).     

一种可控纳米柱阵列的研制

在一次阳极氧化法制备多孔氧化铝(anodized aluminum oxide,AAO)的基础上,进行了二次、三次、四次氧化制备AAO,并对多次氧化制备多孔AAO的电流变化曲线和模板表面的形貌特点等进行了比较分析.二次、三次、四次氧化制备的AAO纳米孔孔径依次增大、孔间距减小,而模板表面的纳米孔有序性分布没有明显变化.控制一次氧化AAO模板的除膜时间,～10 min即可得到孔径规则、高度有序的AAO膜.最后,利用所制备的不同孔深和孔径的AAO为模板,通过热纳米压印复制技术制备了长度和直径等性质可控的PMMA纳米柱阵列. 关键词： 纳米柱阵列 聚甲基丙烯酸甲酯 多孔氧化铝模板 多次氧化法     

利用AAO模板制备银量子点

阳极氧化铝模板(Anodic Aluminum oxide,AAO)是一种具有纳米孔径的透明模板,其孔径在5-200nm范围内可控,孔径大小一致并且分布高度有序。利用阳极氧化铝模板制备量子点具有简单易行,能大规模生产的特点,同时能制备出尺寸大小可控的高度有序的量子点阵,这是其它方法很难做到的,有利于纳米材料及纳米器件的研究与合成。     

Co/AAO纳米有序阵列复合结构的光致发光和光吸收特性

以草酸电解液制备的高度有序的纳米级多孔阳极氧化铝(AAO)为模板,采用交流电化学沉积工艺合成了Co/AAO纳米有序阵列复合结构。分别研究了AAO模板和Co/AAO结构的光致发光和光吸收特性。结果表明,AAO模板在350～550nm范围内存在较强的光致发光带,其峰位在395nm处;Co/AAO纳米有序阵列复合结构的光致发射峰位亦在395nm处,且发光峰强度随Co沉积量的增加而迅速减弱。实验发现,Co/AAO纳米有序阵列复合结构的光吸收边从近紫外至近红外的波段范围内发生大幅度红移,最大红移量甚至超过380nm。文章定性分析并解释了Co/AAO纳米有序阵列复合结构吸收边大幅度红移及其光发射峰位不变、而峰强减弱的主要原因。     

罗丹明6G在银纳米线阵列上的SERS光谱研究

制备出有序、均匀的活性衬底一直足表面增强拉曼散射(SERS)研究中的关键.阳极氧化法制备的多孔氧化铝膜的结构有序、均匀,为纳米金属SERS基底的制备提供了模板.以沉积了银的多孔氧化铝组装体为衬底,研究了罗丹明6G(Rh6G)分子的表面增强拉曼散射光谱.结果表明,沉积了银的多孔氧化铝模板是很好的SERS衬底,Rh6G分子在此衬底上的SERS谱强度与银纳米线在表面的显露高度有关,而其拉曼频移未受表面状态的影响,而PO43-离子的存在使SERS强度得到很大提高.     

金属铜纳米孔洞阵列膜制备方法研究

以多孔阳极氧化铝膜(anodic aluminum oxide，AAO)为模板，用真空蒸镀法复制了金属铜的纳米孔洞阵列膜，SEM结果表明，制备得到的金属铜纳米孔洞阵列膜形貌与AAO膜一致.此方法简单易行，能大规模生产，为纳米膜的工业化复制提供了一种新的工艺，为纳米线、纳米管等纳米阵列材料的合成与组装提供了有利的条件. 关键词： AAO模板 真空蒸镀 金属铜纳米孔洞阵列膜 纳米复制     

纳米多孔金薄膜显微结构分析

 采用亚硫酸金钠为主盐,在阳极氧化铝模板上进行了化学镀和电镀金实验研究。通过扫描电子显微镜和X射线衍射分析测试表明:采用以上两种方法均能制备出纳米多孔金薄膜。两种方法制备的多孔金薄膜微观结构存在较大的差异。化学镀制备的多孔金薄膜微观上是枝晶状的,电镀制备的多孔金薄膜微观上由纳米线构成。     

乙醇对纳米多孔氧化铝薄膜光致发光特性的影响

采用二次阳极氧化法,用乙醇与草酸的混合溶液制备纳米多孔氧化铝薄膜。扫描电子微镜结果显示,乙醇与草酸混合溶液中制备的氧化铝薄膜形貌更规整,有序度更高。光致发光测试结果表明,该混合电解液制备的薄膜的光致发光强度有明显的提高,且随乙醇浓度的增加,发光强度逐渐增大。结合红外反射光谱及X光电子能谱对上述实验现象进行了分析,为多孔氧化铝薄膜掺杂和改善其发光特性提供了新的思路。     

Fabrication of metal nanodot arrays using a porous alumina membrane as a template

Thin nanodotstructured metal films and heterostructured nanodot arrays (metal nanodot arrays/Si) with a high density and uniform distribution for various kinds of metals (Au, Al, Ag, Pb, Cu, Sn, and Zn) were fabricated by thermal vacuum evaporation using an anodic porous alumina membrane as a template. However, for such metals as Sn, Zn, and Pb with relatively lower melting point as compared with Al it was found that heterostructured nanodot arrays were not formed by a single stage of evaporation. For these metals, we developed a new method termed “two step evaporation method”. The size and the arrays of dots were depended on the pore structure in the anodic porous alumina template. The technique demonstrated in this report is simple and suitable for the preparation of nanodot arrays in the large area for materials which could be vacuum evaporated.     

Investigation of the super-long alumina nanowire array synthesized with a novel method

Alumina nanowire array standing on porous anodic alumina (PAA) membrane has been directly and efficiently synthesized in oxalic acid solution by one-step electrochemical anodic oxidation with changing anodic voltages. The morphology of the nanowires on PAA was observed by scanning electron microscopy (SEM). The different patterns on the surface of the sample were synthesized due to the reaction time. The fine structure of the patterns has shown that the pattern is composed of the alumina nanowire array and the morphologies of the patterns can mainly be attributed to the differences in the length of the alumina nanowires. The method of selected area electron diffraction (SAED) for transmission electron microscopy (TEM) has shown that these nanowires are amorphous. An etching model was given to explain the formation mechanism of the amorphous alumina nanowires.     

Controllable synthesis of highly ordered Ag nanorod arrays by chemical deposition method

Highly ordered Ag nanorod arrays were successfully fabricated using a simple chemical deposition method with the assistance of porous alumina membrane (PAM) template. The products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Ag⁺ ions in the PAM nanochannels were reduced by acetaldehyde reagent and resulting in the formation of rod array structures. It is found that the diameter of the Ag nanorods is determined by the PAM template, and the length of the Ag nanorods is depended on the reaction temperature. The growth mechanism of the Ag nanorod arrays is investigated in the study.     

基于包络线法的多孔阳极氧化铝薄膜光学常数的计算

采用二步阳极氧化法在草酸溶液中制备了多孔阳极氧化铝(PAA)薄膜。借助于扫描电子显微镜(SEM)分析了多孔阳极氧化铝薄膜的微观形貌。结果发现,在其表面孔径为30~40nm的六边形孔洞分布均匀,且垂直于表面平行生长。依据PAA透射光谱的实验数据,采用极值包络线算法计算出了PAA薄膜的复折射率以及光学能隙等光学常数。通过分析吸收系数与入射光子能量之间的关系发现,PAA薄膜具有直接带隙半导体的电子结构特征,而且由理论计算得到的PAA的带隙能与其光致发光谱的峰位能是一致的。     

Pluronic P123 assisted synthesis of hollow InSn/In2O3 hybrid nanoparticles by solution dispersion

A detailed analysis of the optimum regimes of pulsed current metal electrodeposition into pores of porous anodic alumina PAA is presented. A simple model based on cathodic and anodic current transients is developed. The model is based on a simplified equivalent circuit consisting of two capacities related to the barrier and porous parts of porous anodic alumina. Nanowires of Cd, Zn, In, Ni, Co, Ag, and Cu were embedded into PAA by pulsed electrodeposition using an asymmetric rectangular ac signal. Deposited metal nanowires were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), optical spectroscopy, Auger electron spectroscopy (AES), and X-ray diffractometry (XRD).     

用PAA模板法实现硅基纳米孔阵列结构

用二次阳极氧化方法制备出分立、双向贯通并且超薄（500—1000 nm）的多孔阳极氧化铝膜,贴合到硅片上进行干法刻蚀,实现图形转移,得到了硅基纳米孔阵列结构,并对工艺中影响图形转移质量的因素进行了探索.扫描电镜（SEM）测试结果表明该途径得到的纳米结构孔形态均匀且大面积有序,孔深度可达到125 nm.对该样品进行热氧化处理后进行光致发光（PL）测试,结果表明其光致发光机理是基于通常较微弱的TO声子辅助的硅带边发光,并实现了显著发光增强,对这种增强效果的物理机理进行了理论分析.该结构具有的独特光学特性为利用 关键词： 多孔阳极氧化铝模板 硅基纳米孔阵列结构 图形转移     

Morphology and transmittance of porous alumina on glass substrate

The porous optical film has higher threshold of laser-induced damage than densified films, for the study of mechanism of laser-induced damage of porous optical film with ordered pore structure. Porous anodic alumina (PAA) film with high transmittance on glass substrate has been prepared. Aluminum film was deposited on glass substrate by means of resistance and electron beam heat (EBH) evaporation. Porous alumina was prepared in oxalic acid solution under different anodizing conditions. At normal incidence, the optical transmittance spectrum over 300-1000 nm spectra region was obtained by spectrophotometer. SEM was introduced to analysis the morphology of the porous alumina film. The pore aperture increased with the increase of anodizing voltage, which resulted in a rapid decrease of the pore concentration and the optical thickness of porous alumina film. Damage morphology of porous alumina film is found to be typically defects initiated, and the defect is the pore presented on the film.     

Si nanopillar arrays with nanocrystals produced by template-induced growth at room temperature

Well-aligned and closely-packed silicon nanopillar (SNP) arrays are fabricated by using a simple method with magnetron sputtering of Si on a porous anodic alumina (PAA) template at room temperature. The SNPs are formed by selective growth on the top of the PAA pore walls. The growth mechanism analysis indicates that the structure of the SNPs can be modulated by the pore spacing of the PAA and the sputtering process and is independent of the wall width of the PAA. Moreover, nanocrystals are identified by using transmission electron microscopy in the as-deposited SNP samples, which are related to the heat isolation structure of the SNPs. The Raman focus depth profile reveals a high crystallization ratio on the surface.     

银纳米有序阵列SERS活性基底的制备及在膀胱肿瘤细胞检测中的应用

以多孔阳极氧化铝(porous anodic alumina,PAA)膜为模板,采用真空电子束蒸镀技术,分别在PAA多孔层以及阻挡层表面形成了银纳米孔和银纳米帽有序阵列表面增强拉曼散射(surface-enhancedRaman scattering,SERS)活性基底,并以膀胱肿瘤细胞作为分子探针,测试和分析了这两种SERS活性基底的表面增强拉曼光谱的特性。结果表明,两种SERS活性基底对膀胱肿瘤细胞的拉曼散射信号均有很好的增强作用。银纳米帽有序阵列SERS活性基底不仅具有较高的SERS增强和荧光猝灭效应,而且不存在与PAA膜中草酸根杂质相关的干扰峰,可获得膀胱肿瘤细胞拉曼散射光谱的更多细节信息。