自组装二维金纳米粒子阵列的后处理：退火，操控及应用

发布时间：2018-07-23 20:44

【摘要】：自组装贵金属二维纳米粒子阵列是一种具有单层厚度和宏观面积尺度的纳米结构。由于纳米粒子颗粒之间的近场耦合效应，贵金属二维纳米粒子阵列整体上表现出了独特的光学、电学、磁学特性，在许多方面具有潜在的应用价值。然而，由于制备过程中各种条件的限制，目前自组装二维纳米粒子阵列在调节及操控等方面还存在诸多挑战。对已制备的纳米粒子自组装体进一步处理是解决这一问题的可行途径。后处理可以有效地对纳米粒子阵列进行调控，并可规避制备条件的限制，充分利用现有制备方法。鉴于此种考虑，本论文围绕着自组装二维金纳米粒子阵列的后处理展开了以下工作。首先，通过热处理一个自组装的二维金纳米粒子阵列来调控纳米颗粒之间的距离，实现了在亚纳米尺度下纳米间距的调控。利用理论模拟的方式验证了热处理条件下纳米颗粒间距减少的极限值，同时还描绘了纳米粒子间距与二维纳米粒子阵列紫外光谱的关系曲线。其次，研究了热处理后的金纳米粒子阵列在不同有机试剂中的响应行为。热处理后的金纳米粒子阵列由于纳米间距的减少及配体烷基链的交叉藕联，其稳定性大大增强。在不同的有机试剂中，由于烷基链的不同伸展度导致了纳米粒子间不同的距离，从而产生了不同的光谱效应。再者，以聚乳酸为媒介物，将热处理后的金纳米粒子阵列从原始基底上转移至目标基底上，系统地研究了转移过程中各种因素对转移效果的影响。并在此基础上，利用转移法将二维金纳米粒子阵列完整的转移至高分子薄膜夹层中，，制备了一种高模量的高分子/无机纳米复合薄膜。
[Abstract]:Self-assembled two-dimensional noble metal nanoparticles array is a kind of nanostructure with monolayer thickness and macroscopic area scale. Due to the near-field coupling effect between nanoparticles, the two-dimensional noble metal nanoparticles array displays unique optical, electrical and magnetic properties, and has potential application value in many fields. However, due to the constraints of various conditions in the preparation process, there are still many challenges in adjusting and manipulating the self-assembled two-dimensional nanoparticles array. Further treatment of the prepared self-assembled nanoparticles is a feasible way to solve this problem. Post-processing can effectively regulate the nanoparticles array and avoid the limitations of preparation conditions and make full use of existing preparation methods. In view of this consideration, the following work has been done on self-assembled two-dimensional gold nanoparticles array. First, the distance between nanoparticles is controlled by heat treatment of a self-assembled two-dimensional gold nanoparticles array, and the nanospheres spacing is regulated at sub-nanoscale scale. The theoretical simulation was used to verify the limit value of decreasing the spacing of nanocrystalline particles under heat treatment, and the curve of the relationship between the spacing of nanoparticles and the UV spectrum of two-dimensional nano-particle array was also described. Secondly, the response behavior of gold nanoparticles array after heat treatment in different organic reagents was studied. After heat treatment, the stability of the gold nanoparticles array was greatly enhanced due to the decrease of nanometer spacing and the cross coupling of ligand alkyl chains. In different organic reagents, the different stretching degree of alkyl chain leads to different distances between nanoparticles, which results in different spectral effects. Furthermore, with polylactic acid as the medium, the gold nanoparticles array after heat treatment was transferred from the original substrate to the target substrate, and the effects of various factors on the transfer effect were systematically studied. On this basis, a kind of high modulus polymer / inorganic nanocomposite film was prepared by transferring the two-dimensional gold nanoparticles array into the interlayer of polymer film.
【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TB383.1

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