Achieving very low levels of detection : an improved surface-enhanced raman scattering experiment for the physical chemistry teaching laboratory

McMillan, Brian G. (2016) Achieving very low levels of detection : an improved surface-enhanced raman scattering experiment for the physical chemistry teaching laboratory. Journal of Chemical Education. ISSN 0021-9584 (https://doi.org/10.1021/acs.jchemed.6b00312)

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Abstract

This experiment was designed and successfully introduced to complement the nanochemistry taught to undergraduate students in a useful and interesting way. Colloidal Ag nanoparticles were synthesized by a simple, room-temperature method, and the resulting suspension was then used to study the surface-enhanced Raman scattering (SERS) of methylene blue. The colloid was also characterized by UV–visible spectroscopy, and these results were used to help explain some of the observed SERS features. The students looked at the effects of concentration and acquisition time on the measured SERS spectra, and the final part of the experiment was based around using their newly acquired knowledge to investigate the lowest concentration of methylene blue that could be detected. Concentrations of 5 × 10-10 M were routinely achieved. The combination of UV–visible spectroscopy, SERS, and nanochemistry made for an interesting and thought-provoking laboratory experience.

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• Item metadata

  Item type:	Article
  ID code:	57755
  Dates:	Date Event 5 August 2016 Published 5 August 2016 Published Online 5 August 2016 Accepted
  Notes:	This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Journal of Chemical Education, copyright © American Chemical Society after peer review. To access the final edited and published work see http://dx.doi.org/10.1021/acs.jchemed.6b00312
  Subjects:	Science > Chemistry
  Department:	Faculty of Science > Pure and Applied Chemistry
  Depositing user:	Pure Administrator
  Date deposited:	12 Sep 2016 10:29
  Last modified:	14 Apr 2024 00:37
  Related URLs:	Journal or Publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/57755