Spectroscopic investigation confirms retaining the pristine nature of single-walled carbon nanotubes on dissolution in aniline

doi:10.1007/s11706-017-0395-7

Front. Mater. Sci.

2017, Vol. 11

Issue (3) : 276-283 https://doi.org/10.1007/s11706-017-0395-7

RESEARCH ARTICLE

Spectroscopic investigation confirms retaining the pristine nature of single-walled carbon nanotubes on dissolution in aniline

Somdutta SINGHA(

), Swapankumar GHOSH(

)

Project Management Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata-700032, India

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Abstract

Carbon nanotubes in all forms are very much insoluble in both organic and inorganic solvents due to its high agglomeration and entangled morphology. General methods for dissolution of single-walled carbon nanotubes (SWNTs) are mostly associated with complexation or polymerization or addition of macromolecules which change the physical or chemical properties of SWNTs and the pristine nature of SWNTs is lost. Dissolution of SWNTs in a solvent like aniline is practiced here which is a very simple reaction method. Here aniline is capable to form a SWNT-aniline charge transfer complex without attachment of macromolecules or polymer which is also soluble in other organic solvents. Solvation of SWNTs by this method is also capable of maintaining the similarity between the structure of SWNTs before and after the dissolution, which means that the pristine nature of SWNTs is preserved. Formation of charge transfer complex in this reaction has been proven by UV-Vis/NIR absorption and photoluminescence spectroscopy. Raman spectroscopy and electron microscopy (FESEM and TEM) are the evidences for protection of the pristine nature of SWNTs even after high-temperature complexation reaction with aniline and also after solubilization in organic solvents.

Keywords single-walled carbon nanotubes aniline dissolution organic solvent spectroscopy

Corresponding Author(s): Somdutta SINGHA,Swapankumar GHOSH

Online First Date: 14 August 2017 Issue Date: 24 August 2017

Cite this article:

Somdutta SINGHA,Swapankumar GHOSH. Spectroscopic investigation confirms retaining the pristine nature of single-walled carbon nanotubes on dissolution in aniline[J]. Front. Mater. Sci., 2017, 11(3): 276-283.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-017-0395-7
https://academic.hep.com.cn/foms/EN/Y2017/V11/I3/276

Fig.1 Scheme&chsp;1&chsp;Formation of donor–acceptor complex by proton transfer between aniline and SWNT.

Fig.2 Digital images of concentrated solutions of (a) AR and (b) ARNT just after the reflux reaction and centrifugation. The same solutions after ×15 dilution of (c) AR and (d) ARNT with chloroform.

Fig.3 (a) UV-Vis spectra of AR and ARNT solutions after the same degree of dilution of both the sample with chloroform, where the solid line represents ARNT and dotted line represent AR. Inset graph is the UV-Vis spectra of pure aniline after the dilution with chloroform.(b) UV-Vis spectra of ARNT solutions as prepared (i) and after 1 month (ii) and 2 months (iii) ageing with the same ×15 diluted sample.

Fig.4 Photoluminescence spectra of aniline-SWNT complex along with aniline reflux at the same dilution made by chloroform after the excitation at 500 nm.

Fig.5 Raman spectra of as supplied SWNTs and ARNT solutions after drop casting them on glass slide. Inset is the digital picture of drop casted glass slide with(a) ARNT and (b) AR solution after dilution with chloroform.

Fig.6 FESEM picture of as supplied (a) SWNT and (b) ARNT after drop casting of solution on glass slides. TEM images of as supplied (c) SWNT and (d) ARNT on carbon grid.

Fig.7 Absorption spectra of ARNT and AR solutions, along with the SWNT dispersion in DMF (inset) in the Vis-NIR range.

Fig.8 (a) Particle size distribution and (b) correlation coefficients of ARNT and SWNT in aniline as obtained from photon scattering experiments.

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