Analyzing Spin Selectivity in DNA-Mediated Charge Transfer via Fluorescence Microscopy

作者：Abendroth John M; Nakatsuka Nako; Ye Matthew; Kim Dokyun; Fullertor Eric E; Andrews Anne M; Weiss Paul S

来源：ACS Nano, 2017, 11(7): 7516-7526.

DOI：10.1021/acsnano.7b04165

• chiral-induced spin selectivity effect
• perylenediimide
• DNA-mediated charge transfer
• chemical lift-off lithography
• photospintronics
• fluorescence microscopy

Understanding spin-selective interactions between electrons and chiral molecules is critical to elucidating the significance of electron spin in biological processes and to assessing the potential of chiral assemblies for organic spintronics applications. Here, we use fluorescence microscopy to visualize the effects of spin-dependent charge transport in self-assembled monolayers of double-stranded DNA on ferromagnetic substrates. Patterned DNA arrays provide background regions for every measurement to enable quantification of substrate magnetization dependent fluorescence due to the chiral-induced spin selectivity effect. Fluorescence quenching of photoexcited dye molecules bound within DNA duplexes is dependent upon the rate of charge separation/recombination, upon photoexcitation and the efficiency of DNA-mediated charge transfer to the surface. The latter process is modulated using an external magnetic field to switch the magnetization orientation of the underlying ferromagnetic substrates. We discuss our results in the context of the current literature on the chiral-induced spin selectivity effect across various systems.

• 出版日期2017-7