Zheng Yu, Bachilo Sergei M, Weisman R Bruce
Department of Chemistry and the Smalley-Curl Institute and ‡Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
J Phys Chem Lett. 2017 May 4;8(9):1952-1955. doi: 10.1021/acs.jpclett.7b00583. Epub 2017 Apr 18.
The selective interactions between short oligomers of single-stranded DNA (ssDNA) and specific structures of single-walled carbon nanotubes have been exploited in powerful methods for nanotube sorting. We report here that nanotubes coated with ssDNA also display selective interactions through the selective quenching of nanotube fluorescence by dissolved oxygen. In aqueous solutions equilibrated under 1 atm of O, emission intensity from semiconducting nanotubes is reduced by between 9 and 40%, varying with the combination of ssDNA sequence and nanotube structure. This quenching reverses promptly and completely on the removal of dissolved O and may be due to physisorption on nanotube surfaces. Fluorescence quenching offers a simple, nondestructive approach for studying the structure-selective interactions of ssDNA with single-walled carbon nanotubes and identifying recognition sequences.
单链 DNA（ssDNA）短寡聚物与单壁碳纳米管特定结构之间的选择性相互作用已被用于强大的纳米管分类方法中。我们在此报告，涂有 ssDNA 的纳米管还通过溶解氧对纳米管荧光的选择性猝灭表现出选择性相互作用。在 1 个大气压的 O 下平衡的水溶液中，半导体纳米管的发射强度降低了 9%至 40%，这随 ssDNA 序列和纳米管结构的组合而变化。去除溶解的 O 后，这种猝灭会迅速且完全逆转，这可能是由于在纳米管表面的物理吸附。荧光猝灭为研究 ssDNA 与单壁碳纳米管的结构选择性相互作用以及识别识别序列提供了一种简单、无损的方法。
