Analytical and Bioanalytical Chemistry

, Volume 408, Issue 18, pp 4965–4973 | Cite as

Surface-enhanced Raman spectroscopy for the analysis of smokeless gunpowders and macroscopic gunshot residues

  • María López-López
  • Virginia Merk
  • Carmen García-Ruiz
  • Janina Kneipp
Research Paper

Abstract

Gunshot residues (GSR) result from the discharge of a firearm being a potential piece of evidence in criminal investigations. The macroscopic GSR particles are basically formed by burned and non-burned gunpowder. Motivated by the demand of trace analysis of these samples, in this paper, the use of surface-enhanced Raman scattering (SERS) was evaluated for the analysis of gunpowders and macroscopic GSR particles. Twenty-one different smokeless gunpowders were extracted with ethanol. SERS spectra were obtained from the diluted extracts using gold nanoaggregates and an excitation wavelength of 633 nm. They show mainly bands that could be assigned to the stabilizers diphenylamine and ethylcentralite present in the gunpowders. Then, macroscopic GSR particles obtained after firing two different ammunition cartridges on clothing were also measured using the same procedure. SERS allowed the detection of the particles collected with an aluminum stub from cloth targets without interferences from the adhesive carbon. The results demonstrate the great potential of SERS for the analysis of macroscopic GSR particles. Furthermore, they indicate that the grain-to-grain inhomogeneity of the gunpowders needs to be considered.

Graphical Abstract

SERS allows the detection of GSR particles collected with adhesive stubs from cloth targets using gold nanoaggregates and an excitation wavelength of 633 nm

Keywords

Diphenylamine Forensic Gunpowder Gunshot residue SERS 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • María López-López
    • 1
    • 2
  • Virginia Merk
    • 3
  • Carmen García-Ruiz
    • 1
    • 2
  • Janina Kneipp
    • 3
  1. 1.Department of Analytical Chemistry, Physical Chemistry and Chemical EngineeringUniversity of AlcaláAlcalá de HenaresSpain
  2. 2.University Institute of Research in Police Sciences, Edificio Polivalente de QuímicaUniversity of AlcaláAlcalá de HenaresSpain
  3. 3.Department of ChemistryHumboldt-Universität zu BerlinAdlershofGermany

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