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Infrared and Raman investigation of carbon nanotube‐polyallylamine hybrid systems
Author(s) -
Tóháti HajnalkaMária,
Botka Bea,
Németh Katalin,
Pekker Áron,
Hackl Rudi,
Kamarás Katalin
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000435
Subject(s) - carbon nanotube , raman spectroscopy , materials science , allylamine , polymer , surface modification , nanotube , attenuated total reflection , selective chemistry of single walled nanotubes , infrared spectroscopy , nanotechnology , optical properties of carbon nanotubes , adsorption , chemical engineering , polyelectrolyte , organic chemistry , composite material , chemistry , optics , physics , engineering
Non‐covalent functionalization of carbon nanotubes (CNTs) by polymers or aromatic systems is a rapidly emerging field. Its importance originates in the possibility of combining special (optical, electric, or dispersive) properties of the added molecules with the mechanical stability of nanotubes. A special application is to use the polymers as interfaces between nanotubes and metallic nanoparticles (“molecular glue”). Crucial to all applications is an experimental tool to characterize the interaction strength between the nanotubes and the associated species. In this paper, we study hybrids of single‐walled nanotubes (SWNT) and polyallylamine obtained from poly(allylamine hydrochloride) (PAH) at high pH. We use attenuated total reflection (ATR) spectroscopy and Raman spectroscopy to understand how polyallylamine covers the surface of the nanotubes. The interaction of the evanescent field on the surface of the nanotube with the vibrations of the adsorbed species invokes surface selection rules and, hence, surface‐attenuated infrared absorption (SAIRA). Raman spectra prove diameter‐selective solubilization of the polymer‐covered nanotubes.