title: Bare gold nanoparticles mediated surface-enhanced Raman spectroscopic determination and quantification of carboxylated single-walled carbon nanotubes.
abstract: The paper proposes a simple and portable approach for the surface enhanced Raman scattering (SERS) spectroscopy in situ determination of carboxylated single walled carbon nanotubes (SWNTs) in river water samples. The method is based on the subsequent microfiltration of a bare gold nanoparticles solution and the water sample containing soluble carbon nanotubes by using a home-made filtration device with a small filtration diameter. An acetate cellulose membrane with a pore size of 0.2 μm first traps gold nanoparticles to form the SERS-active substrate and then concentrates the carbon nanotubes. The measured SERS intensity data were closely fit with a Langmuir isotherm. A portable Raman spectrometer was employed to measure SERS spectra, which enables in situ determination of SWNTs in river waters. The limit of detection was 10 μg L(-1). The precision, for a 10 mg L(-1) concentration of carbon nanotubes, is 1.19% intra-membrane and 10.5% inter-membrane.
authors.affiliation: Department of Analytical Chemistry, University of Córdoba, E-14071 Córdoba, Spain.
authors.forename: A I
authors.initials: AI
authors.lastname: López-Lorente
authors.forename: B M
authors.initials: BM
authors.lastname: Simonet
authors.forename: M
authors.initials: M
authors.lastname: Valcárcel
authors.forename: B
authors.initials: B
authors.lastname: Mizaikoff
keywords: AFM; CNTs; Carboxylated single walled carbon nanotubes; Cellulose membrane; EDX; Gold nanoparticles; MWNTs; NPs; RBM; RSD; SEM; SERS; STP; SWNTs; Surface-enhanced Raman scattering; TEM; atomic force microscopy; c-SWNTs; carbon nanotubes; carboxylated single walled carbon nanotubes; energy-dispersive X-ray; multiwalled carbon nanotubes; nanoparticles; radial breathing mode; relative standard deviation; scanning electron microscopy; sewage treatment plant; single-walled carbon nanotubes; surface enhanced Raman scattering; transmission electron microscopy