【作者】 李旭；

【导师】 杨学恒；

【作者基本信息】 重庆大学 ， 理论物理， 2005， 硕士

【摘要】 原子力显微镜(AFM)作为纳米科技中最为有效和重要的检测加工手段之一,其应用随着纳米科技热的兴起而日益引起人们的重视,仪器本身的稳定性、图像质量、操作的简便性以及应用领域的拓展和产业化也越来越受到关注。通过对AFM 基本原理的了解,以及对相应于不同应用的改进技术和在同样原理基础上发展起来的新型检测仪器的了解为背景,通过比较和分析,找出给现有AFM 仪器增加新功能的可行性。在对其主要的缺陷和不足有了比较深入认识的基础之上,针对IPC-208BJ 型机的研制和应用过程中碰到的问题,提出了配合新应用的改进方案,并进行了初步的实验研究,积累了应用经验。不仅拓展了AFM 的应用领域,也为AFM 在国内的普及和产业化奠定了良好的基础。本论文研究的主要内容包括:研究了AFM 扫描控制系统设计的基本理论,寻找出电路中适于引入其他装置以增加新功能的工作点;根据扫描隧道谱(STS)相关实验方式,在IPC-208BJ 型机的反馈回路中引入控制开关,并借助外围设备(函数信号发生器、存储示波器等)进行了三种样品(纳米碳酸钙、二氧化钛、晶体硅)的STS 实验,获得了初步的结论;研究了与其他方式相比较,STM 作为原子力显微镜(AFM)微悬臂的微位移检测装置的适用性,以及对应的对于金属丝微悬臂的改进措施,对于钨丝针尖的改进措施;针对生物样品的特殊性,对几种样品进行检测并对结果进行分析.更多还原

【Abstract】 Atomic Force microscope (AFM), one of the most effective and important means of testing and processing in nanometer technology, is receiving increasing popularity in application with the rising of nanometer technology. Besides the stability of the instrument itself, the quality of the re-built pictures, the simplicity of its operation, the expansion of its application sphere and the trend of becoming an industry is being more and more concerned. This dissertation is based on the foundational principles of the AFM, modified-techniques related to different application and some new-typed instrument that sharing the same principles. By comparing and analyzing, this dissertation proves that there is feasibility to add new function to it. Having known about its shortages in the procedure of developing and applying, this dissertation presents the way to modify it to satisfy the need comes from new application. Some experiments were done to test the modification. More application experience is gained. This does not only expand its application sphere but also make it easy to get popularization and industrialization. This dissertation concerns the design of IPC-208BJ to find out the best point to add new device to it. Inserting a switch in the feed-back circuit to fit Scanning Tunneling Spectrum (STS) testing. With a function generator and a oscillograph, three specimen (nano-Caco3、TiO2、Si) were tested. Qualitative analysis was made about the STS obtained in the experiment. This dissertation also studied the applicability of STM as the device to detect the micro-displace of the cantilever of the Atomic Force Microscope (AFM). The cantilever is modified from a wiry one that not fit for STM as the sensor. The modification methods for tungsten filament needlepoint . Considering the specialties of biological sample, we tested some biological sample and analysised the result.更多还原