【作者】 金嫦香；

【导师】 周骏；

【作者基本信息】 宁波大学 ， 理论物理， 2009， 硕士

【摘要】 本文主要对DNA-CTMA薄膜的制备及DNA-CTMA薄膜光电特性表征进行研究。我们利用离子交换法制备DNA-CTMA复合物,通过旋转涂覆法和自组装法将DNA-CTMA复合物制备成薄膜波导,表征了DNA-CTMA薄膜的吸收光谱、折射率、交流电阻率等光电特性参数,并利用棱镜耦合的方法观测到DNA-CTMA薄膜波导的m线。首先,本文综述了DNA-类脂复合物独特的光电特性及其在光电子器件应用的研究进展。DNA-类脂复合物薄膜,具有透光性好、光学损耗低、在200-250℃仍很稳定等优点。DNA独特的双螺旋结构不但使DNA-阳离子表面活化剂复合物薄膜具有良好的光学特性,而且DNA碱基对结构中的π?π结构为电子的传输提供了通道,同时也为掺杂功能染料提供了纳米级尺寸的自由空间。DNA-类脂复合物在光电子器件中的应用方面,主要有生物有机发光二极管(BioLED)、生物有机半导体场效应管(BioFET)和DNA-类脂复合物在主客掺杂型波导中的应用等。DNA-类脂复合物优越的光电子特性是制备高质量光电子器件的基础。本文第二章根据导波光学理论,应用射线光学方法和电磁理论推导薄膜波导中TE和TM导模的本征方程,分析薄膜波导中传播模式和辐射模式的产生条件,从而为设计和制备DNA-CTMA薄膜波导光电子器件提供理论指导;概括介绍了薄膜波导的折射率和厚度、光传输损耗的测量方法,为测量DNA-CTMA薄膜光电特性和分析波导实验结果奠定了理论基础。在本章的最后,概括了目前介质波导所用的材料,如铌酸锂(LiNbO3)晶体、半导体化合物、二氧化硅(SiO2)、SOI(绝缘体上硅)、聚合物等,以及各种材料的主要光学特性参数。第三章是实验部分。我们利用三文鱼、青鱼和鲫鱼的DNA分别制备成DNA-CTMA薄膜,对三种DNA以及2000bp和50bp两种不同链长的三文鱼DNA进行对比实验,包括对DNA-CTMA薄膜从紫外200nm到红外25μm的吸收光谱、m线、DNA-CTMA薄膜的折射率、交流电阻等光学特性进行表征。实验结果显示:用不同DNA制备的DNA-CTMA薄膜表现出非常相似的吸收光谱、折射率和交流电阻;不同链长的DNA-CTMA薄膜的光学特性的对比,显示出链的长短并不影响吸收光谱和折射率的大小;另外,分析了在薄膜的制备过程中,残留丁醇及制膜温度和干燥时间对薄膜折射率的影响。薄膜交流电阻率测量结果显示:50bp短链DNA-CTMA薄膜的交流电阻率要比2000bp长链DNA-CTMA薄膜的交流电阻率小2-3个数量级;DNA-CTMA薄膜的电阻随交流电频率的增大而减小;随交流电频率的增大,50bp短链DNA-CTMA薄膜的电阻比2000bp长链DNA-CTMA薄膜电阻减小得更快。更多还原

【Abstract】 The preparation and photo-electricity characteristics of DNA-CTMA films are mainly studied in this thesis. DNA-CTMA complexes were prepared by ion-change method,and DNA-CTMA thin film were fabricated by self-assembled and spin-coating methods, respectively. The photo-electricity characteristics of DNA-CTMA, such as the absorb spectra, refractive index, ac resistance and so on, were taken. The m lines were examined through prism coupling method.The unique photo-electricity characteristics and application as an optoelectronic film material of DNA-lipid complex are reviewed in the first part of the thesis. High optical transparency, low loss, thermal stability limit as high as 200-250℃are all the advantages of DNA-lipid complex film. Theπ?πstacking structure of the nucleo-base pairs of DNA not only form a tunnel ready for electron transfer, but also gives the film materials high optical transparency. Nanosize free space was offered for doping with functional dyes. And then , the application in optoelectronic field were summarized, including Bio-Organic Light Emitting Diode(BioLED), Bio-organic-semi- conductor-field-effect-transistor(BioFET) and application in host/guest waveguide and so on. The superior photo-electricity characteristics of DNA-CTMA are the basis of preparation super photo-electricity device.The intrinsic equation of TE and TM mode in plane waveguide were derived on the basis of ray optics and electromagnetic theory in the second part of this thesis. The condition of guided mode and radiation mode were summarized, offering the theory guide in designing and preparation of DNA-CTMA plane waveguide. The measure methods of index of refraction, thickness and loss of plane waveguide were summarized,which are the theory basic of measure in optical characteristics and analysis the experimental results of DNA-CTMA films. The characteristics of photo-electricity of dielectric waveguide material including LiNbO3 crystalloid, semiconductor complex, SiO2, SOI and polymer were summarized in the last nodule.The third part of this thesis is the experiment. DNA-CTMA films were fabricated use Salmon DNA, herring DNA, crucian DNA. 2000bp Salmon DNA-CTMA films were compared with 50bp Salmon DNA-CTMA films in terms of photo-electricity characteristics, including absorption spectrum with wavelength from 200nm to 25μm , m line, index of refraction of DNA-CTMA films and ac resistance. Results show, alike absorption spectra, refractive index and ac resistance were appeared among three kind of DNA. Different length of DNA molecule owed the same absorption spectra and refractive index. In addition, in the preparation process of the films, the some effect factors to the refractive index of film were analyzed, for example, the butanol remained in film, temperature and the dry time. And the ac resistivity of 50bp short DNA-CTMA thin film is less 2-3 orders of magnitude than the 2000bp longer DNA-CTMA thin film. The ac resistance of DNA-CTMA films decreases with increasing frequency of alternating current. Ac resistance of 50bp short DNA-CTMA film decreases at a much faster rate than that of 2000bp DNA-CTMA with frequency increasing.更多还原