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Ordinary AFM probes‘ characters prevent the AFM‘s application in various scopes. Carbon nanotubes represent ideal AFM probe materials for their higher aspect ratio, larger Young‘ s modulus, unique chemical structure, and well-defined electronic property. Carbon nanotube AFM probes are obtained by using a new method of attaching carbon nanotubes to the end of ordinary AFM probes, and are then used for doing AFM experiments. These experiments indicated that carbon nanotube probes have higher elastic deformation, higher resolution and higher durability. And it was also found that carbon nanotube probes can accurately reflect the morphology of deep narrow gaps, while ordinary probes can not reflect. 相似文献
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原子力显微镜(AFM)在空气中对DNA进行观察时,针尖很容易对其造成损伤,从而影响图象质量,为探索此问题的解决办法,本研究在空气、水和无水乙醇中对DNA进行成象,同时对针尖的结构进行了扫描电镜观察,取100μg/ml质粒pQE30水溶液20μl滴加在新鲜剥离的云母基底上,吸附1min,用滤纸吸去基底上的多余残液,氮气吹干后在空气中成像;pQE30分别溶于去离子水和无水乙醇,质量浓度为100μg/ml,各取100μl加入液体池中成象,成象时均采用MultiMode AFM(NanoscopeⅢa)的敲击模式,并记录力曲线,结果发现:在液体中DNA的图象分辨率优于在空气中,在无水乙醇中优于在水中;针尖与DNA样品间的相互作用力越大,成象的分辨率越低,多次使用后针磨损,分辨率降低,这一结果为选择DNA的理想AFM成象环境,研究生理条件下DNA的结构和功能提供了实验基础。 相似文献
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