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. 2020 Jun 16;10(6):1176. doi: 10.3390/nano10061176

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Fourier transform infrared spectroscopy (FT-IR) spectra of: (a) CNTs, (b) CNT-SP, (c) CNT-1,2,5-trimethyl-1H-pyrrole (TMP), (d) CNT-2,5-dimethyl-1-(3-(triethoxysisyl)propyl)-1H-pyrrole (APTESP), and (e) CNT-1-dodecyl-2,5-dimethyl-1H-pyrrole (DDcP). Panel (I): 700–3900 cm⁻¹ region; Panel (II): fingerprint region 700–1800 cm⁻¹ after baseline correction. Spectra are displayed with normalized intensity. Peaks discussed in the text and the absorption features due to the diamond anvil cell (DAC) accessory are labeled in the figure.