基于生色团-纳米管混合器件的颜色检测
Color Detection Using Chromophore-Nanotube Hybrid Devices
摘要：
我们提出了一个纳米级的颜色检测器的基础上的单壁碳纳米管功能化偶氮苯生色团，其中生色团作为光吸收剂和纳米管作为电子读出。通过合成在可见光谱中具有特定吸收窗口的发色团并将其锚定到纳米管表面，我们展示了在窄波长范围内对低强度的可见光的受控检测。我们的测量结果表明，在光吸收，生色团异构化从基态的反式配置的激发态顺式配置，伴随着一个大的变化，在偶极矩，改变静电环境的纳米管。全电子从头计算被用来研究发色团的纳米管杂化物，并显示发色团强烈结合到纳米管，而不干扰任何物种的电子结构。计算值的偶极矩支持偶极变化的光学检测机制的概念。
英文摘要：
We present a nanoscale color detector based on a single-walled carbon nanotube functionalized with azobenzene chromophores, where the chromophores serve as photoabsorbers and the nanotube as the electronic read-out. By synthesizing chromophores with specific absorption windows in the visible spectrum and anchoring them to the nanotube surface, we demonstrate the controlled detection of visible light of low intensity in narrow ranges of wavelengths. Our measurements suggest that upon photoabsorption, the chromophores isomerize from the ground state trans configuration to the excited state cis configuration, accompanied by a large change in dipole moment, changing the electrostatic environment of the nanotube. All-electron ab initio calculations are used to study the chromophore-nanotube hybrids, and show that the chromophores bind strongly to the nanotubes without disturbing the electronic structure of either species. Calculated values of the dipole moments support the notion of dipole changes as the optical detection mechanism.
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