光学生物传感器检测环境的模型
A model of an optical biosensor detecting environment
摘要：
海勒等Al.（Science 311，508（2006））通过在单壁碳纳米管（CN）的表面周围包裹一片双链DNA展示了第一个DNA-CN光学传感器。这种新型的光学设备可以放置在活细胞内，并通过近红外线检测微量的有害污染物。利用纳米结构中简单的激子理论和DNA的B-Z结构相变现象，研究了这种新型的DNA光学生物传感器的工作原理，即利用纳米结构表面作为传感器，检测DNA对目标离子的响应而引起的性质变化。我们还提出了一些新的设计模型，用石墨烯带半导体取代碳纳米管。
英文摘要：
Heller et. Al. (Science 311, 508 (2006)) demonstrated the first DNA-CN optical sensor by wrapping a piece of double-stranded DNA around the surface of single-walled carbon nanotubes (CN). This new type of optical device can be placed inside living cells and detect trace amounts of harmful contaminants by means of near infrared light. Using a simple exciton theory in nanostructures and the phenomena of B-Z structural phase transition of DNA, we investigate the working principle of this new class of optical biosensor from DNA by using the nanostructure surface as a sensor to detect the property change of DNA as it responds to the presence of target ions. We also propose some new design models by replacing carbon nanotubes with graphene ribbon semiconductors.
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