Mechanico-chemical interaction of SWNTs with different host matrices evidenced by SERS spectroscopy

Serge Lefrant; Mihaela Baibarac; Ioan Baltog; Christine Godon; Jean-Yves Mevellec; Lucian Mihut

doi:10.1117/12.608098

28 June 2005 Mechanico-chemical interaction of SWNTs with different host matrices evidenced by SERS spectroscopy

Serge Lefrant, Mihaela Baibarac, Ioan Baltog, Christine Godon, Jean-Yves Mevellec, Lucian Mihut

Proceedings Volume 5838, Nanotechnology II; (2005) https://doi.org/10.1117/12.608098
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

Abstract

Surface enhanced Raman scattering (SERS) with 676.4 and 1064 nm excitations was used to investigate single-walled carbon nanotubes (SWNTs) compressed non-hydrostatically at 0.58 GPa, alone and dispersed into chemical reactive and non-reactive (SiO₂ and Al₂O₃) host matrices. As reactive host matrices, we used inorganic compounds (KI and Ag microparticles) and aromatic hydrocarbons (biphenyl, naphthalene, p-terphenyl, phenantrene). SERS spectra indicate that by compression, SWNTs break in fragments of different size, which in turn can react or not with the host matrix. Various mechanico-chemical reactions take place. In inorganic matrices such as KI and Ag, donor-acceptor complexes are formed. Regardless of aromatic hydrocarbons type used as organic matrices, i.e. with isolated or condensed phenyl rings, a non-covalent functionalization of SWNTs is produced. Using aromatic hydrocarbons with isolated phenyl rings like biphenyl or p-terphenyl, an ionic and covalent functionalization of SWNT fragments is demonstrated by the appearance of new Raman bands at 1160 and 1458 cm^-1, the latter being associated with the Ag(2) pentagonal pinch mode observed regularly in Raman spectra of C₆₀ fullerenes. The signature for the appearance of short fragments of carbon nanotubes, behaving as closed-shell fullerenes, is observed also in photoluminescence spectra carried out on SWNTs compressed in biphenyl and p-terphenyl matrix. Additional proofs are found by transmission electron microscopy (TEM) investigations.

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Serge Lefrant, Mihaela Baibarac, Ioan Baltog, Christine Godon, Jean-Yves Mevellec, and Lucian Mihut "Mechanico-chemical interaction of SWNTs with different host matrices evidenced by SERS spectroscopy", Proc. SPIE 5838, Nanotechnology II, (28 June 2005); https://doi.org/10.1117/12.608098

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