Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7690950 | Vibrational Spectroscopy | 2018 | 19 Pages |
Abstract
The black inkjet and laser prints were analysed with regard to application in forensic analysis of questioned documents. The purpose of this work was to study spectral properties and compare the suitability of surface-enhanced Raman scattering (SERS) with Fourier transform Raman spectra of prints. This work aimed to find optimal surface-enhanced Raman spectroscopic approach for the future analysis of documents using statistical methods. In this work, we analysed eight prints of four laser and four inkjet devices. The samples were measured using two dispersive Raman devices; (DXR Raman microscope with excitation line 532Â nm, Foram 685-2 spectrometer â 685Â nm) and FT-Raman device (Bruker Spectrometer MultiRAM with excitation line 1064Â nm). The silver nanoparticles (AgNPs) colloid for SERS experiment were synthesised and checked by UV-vis spectroscopy and scanning electron microscopy (SEM). The remarkable differences caused by centrifugation of silver colloid were observed just in the SEM images. The main contribution of this paper is to propose the novel approach achieving sufficient SERS signal intensity of black prints using the both, laser and inkjet printers. Moreover, this method is based on just a single metal colloid, and the analysis can be performed in-situ, i.e. directly on the printed sample surface. We consider the SERS could by highly promising and universal for applications in the forensic analysis of printed documents with the combination of statistical method when conventional methods are not effective.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Michal Oravec, Vlasta Sasinková, KatarÃna Tomanová, LukáÅ¡ Gál, Silvia Parciová, Christian W. Huck,