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Polarized Raman Spectroscopy of Aligned Dna-Wrapped Single-Wall Carbon Nanotubes Publisher



Banihashemian SM1 ; Mesbah M2 ; Kamyab H3, 4, 5 ; Taheri MM6 ; Balasubramanian B7
Authors
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Authors Affiliations
  1. 1. MEMS & NEMS Laboratory, Faculty of New Sciences & Technologies, University of Tehran, PO Box 14395-1561, Tehran, Iran
  2. 2. Metallurgy Department, Faculty of Engineering, University of Mons, 20, Place Du Parc, Mons, Belgium
  3. 3. Department of Biomaterials, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai, 600077, India
  4. 4. The KU-KIST Graduate School of Energy and Environment, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul, 02841, South Korea
  5. 5. Faculty of Social Sciences, Media and Communication, University of Religions and Denominations, Qom, Pardisan, Iran
  6. 6. Department of Pharmaceutical Biomaterials, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
  7. 7. Department of Food Science and Biotechnology, College of Life Sciences, Sejong University, Seoul, 05006, South Korea

Source: Carbon Trends Published:2025


Abstract

This study introduces a new method to create highly ordered, self-aligned arrays of single-wall carbon nanotubes (SWCNTs) using short DNA composed of 20 thymine bases, known as Poly(dT)20. The SWCNTs were first functionalized through a chemical treatment involving a mixture of sulfuric acid (H2SO4) and nitric acid (HNO3) in a 3:1 ratio, followed by uniform dispersion achieved via a cold ultrasonic technique. Subsequently, the Poly(dT)20 was wrapped around the SWCNTs using a sonothermal process, with variations in time and temperature to enhance alignment. The structural integrity and alignment of the resulting Poly(dT)20 /SWCNT arrays were characterized using scanning electron microscopy (SEM), and profile meter geometry analysis, all of which confirmed the successful alignment of the SWCNTs. Further analysis through ultraviolet-visible spectroscopy (UV–VIS) and Fourier-transform infrared spectroscopy (FTIR) provided evidence of the bonding interactions between the Poly(dT)20 and SWCNTs. Ennhanced Raman spectroscopy of the Poly(dT)20/SWCNT arrays, conducted with polarized light, revealed a significant dependence of the G-band on the polarization angle, yielding a depolarization ratio of 0.211 and linear relationship between I and Cos 2 (α). The HRTEM image confirms that the attachment of 20-mer thymine to single-walled carbon nanotubes (SWCNTs) by wrapping around them introduces steric hindrance, which physically separates the nanotubes and prevents aggregation. This finding indicates a well alignment of the Poly(dT)20/SWCNT arrays. The anisotropic characteristics exhibited by the SWCNTs in conjunction with the Poly(dT)20 as a biomaterials suggest promising applications in various fields, including biomedical components, nano-electronic devices, and bio-optics. © 2025 The Author(s)