Abstract
In order to enhance the applicability and functionality of DNA-based complexes, we introduced hydroxyl (–OH) group-modified multi-walled carbon nanotubes (MWCNT–OH), which can aid the dispersion and adsorption in the DNA template. Herein, we fabricated MWCNT–OH-combined DNA and cetyltrimethyl-ammonium chloride-modified DNA (DNA-CTMA) layers using the solution-processed method. The distinct chemical and physical characteristics of the MWCNT–OH-combined DNA and DNA-CTMA layers were examined through various characterisation techniques. For instance, the elemental and surface characteristics were analysed by energy-dispersive x-ray spectroscopy, field emission scanning electron microscopy, and atomic force microscopy. The charge transfer was examined by x-ray photoelectron spectroscopy. In the x-ray photoelectron spectra, a negative peak shift was observed, indirectly indicating that the charge transfer from MWCNT‒OH to DNA occurred. The vibrational and rotational modes were analysed by Raman spectroscopy, and the characteristic functional group and molecular interaction were examined using Fourier transform infrared spectroscopy. As expected, we observed four major characteristic Raman bands of MWCNT–OH in the DNA and DNA-CTMA layers which corresponded to the D-, G-, and G′-bands as well as the strain-induced band. Finally, the light absorption, photoluminescence, and electrical characteristics were examined using UV–vis–NIR spectroscopy, a photoluminescence mapper, and a probe station, respectively. The absorption in the full spectral range, photoluminescence quenching, and current enhancement of DNA and DNA-CTMA layers combined with MWCNT–OH were influenced by the electrostatic and van der Waals interactions between MWCNT–OH and DNA (DNA-CTMA). Our results will provide a simple protocol for constructing composite layers made of organic and inorganic materials which show novel characteristics with easy controllability.
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