Experimental Evidence of Single-Stranded DNA Adsorption on Multiwalled Carbon Nanotubes,The Journal of Physical Chemistry B

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Experimental Evidence of Single-Stranded DNA Adsorption on Multiwalled Carbon Nanotubes
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-03-16 , DOI: 10.1021/acs.jpcb.0c00882
Franco Tardani ₁ , Stefano Sarti , Simona Sennato ₁ , Manuela Leo , Patrizia Filetici , Stefano Casciardi ₂ , Pier Giorgio Schiavi , Federico Bordi ₁

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Noncovalent DNA functionalization is one of the most used routes for the easy dispersion of carbon nanotubes (CNTs) yielding DNA-CNTs complexes with promising applications. Definition of the structure of adsorbed DNA is crucial, but the organization of polymer at the carbon interface is far from being understood. In comparison to single-walled nanotubes, not much effort has been devoted to assessing the structure of the adsorbed DNA on multiwalled carbon nanotubes (MWCNTs), where their metallic nature, large size, and polydispersity represent serious obstacles for both experimental and theoretical studies. As a contribution to fill this lack in these aspects, we investigated DNA-MWCNT complexes by dielectric spectroscopy (DS) which is sensitive to even small changes in the charge distribution at charged interfaces and was largely employed in studying the electric and conformational properties of polyelectrolytes, such as DNA, in aqueous solutions and at interfaces. The dielectric relaxation in the MHz range is the signature of DNA adsorption on CNTs and sheds light on its conformational properties. A detailed analysis of the conductivity of the DNA-MWCNT suspensions unequivocally proves that DNA is adsorbed in a single-stranded conformation while excess DNA reassociates without interfering with the stability of the complexes.

中文翻译：

多壁碳纳米管上单链DNA吸附的实验证据

非共价DNA功能化是碳纳米管（CNT）易于分散的最常用方法之一，可产生具有广阔前景的DNA-CNTs复合物。吸附的DNA的结构的定义至关重要，但是在碳界面处的聚合物组织还远未了解。与单壁纳米管相比，在评估多壁碳纳米管（MWCNT）上吸附的DNA的结构方面投入了很多精力，而金属纳米管的金属性质，大尺寸和多分散性使其成为实验和理论研究的严重障碍。为了弥补这些方面的不足，我们通过介电谱法（DS）研究了DNA-MWCNT配合物，该配合物对带电界面处的电荷分布甚至很小的变化都非常敏感，并且被广泛用于研究水溶液和界面处的聚电解质（如DNA）的电和构象性质。MHz范围内的介电弛豫是DNA吸附在CNT上的标志，并阐明了其构象性质。对DNA-MWCNT悬浮液电导率的详细分析明确证明，DNA以单链构型吸附，而过量的DNA重新结合而不会影响复合物的稳定性。MHz范围内的介电弛豫是DNA吸附在CNT上的标志，并阐明了其构象性质。对DNA-MWCNT悬浮液电导率的详细分析明确证明，DNA以单链构型吸附，而过量的DNA重新结合而不会影响复合物的稳定性。MHz范围内的介电弛豫是DNA吸附在CNT上的标志，并阐明了其构象性质。对DNA-MWCNT悬浮液电导率的详细分析明确证明，DNA以单链构型吸附，而过量的DNA重新结合而不会影响复合物的稳定性。

更新日期：2020-03-19

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