Bare gold nanoparticles mediated surface-enhanced Raman spectroscopic determination and quantification of carboxylated single-walled carbon nanotubes

- c-SWNTs have been determined in spiked river water samples by SERS spectroscopy.
- Bare AuNPs are microfiltrated on a membrane forming the SERS active substrate.
- Measured SERS intensity data were closely fit to a Langmuir isotherm.
- The use of a portable Raman spectrometer enables in situ determination of SWNTs.
- The limit of detection of the proposed methodology is 10 μg L−1.