Journal
JOURNAL OF FORENSIC SCIENCES
Volume 54, Issue 4, Pages 947-952Publisher
WILEY
DOI: 10.1111/j.1556-4029.2009.01058.x
Keywords
forensic science; questioned documents; ink analysis; dyes; Raman spectroscopy; surface-enhanced Raman scattering; SERS
Categories
Funding
- Direct For Education and Human Resources
- Division Of Human Resource Development [833180] Funding Source: National Science Foundation
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The applicability of Raman spectroscopy and surface-enhanced Raman scattering (SERS) to the analysis of synthetic dyes commonly found in ballpoint inks was investigated in a comparative study. Spectra of 10 dyes were obtained using a dispersive system (633 nm, 785 nm lasers) and a Fourier transform system (1064 nm laser) under different analytical conditions (e.g., powdered pigments, solutions, thin layer chromatography [TLC] spots). While high fluorescence background and poor spectral quality often characterized the normal Raman spectra of the dyes studied, SERS was found to be generally helpful. Additionally, dye standards and a single ballpoint ink were developed on a TLC plate following a typical ink analysis procedure. SERS spectra were successfully collected directly from the TLC plate, thus demonstrating a possible forensic application for the technique.
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