Geiman Irina, Leona Marco, Lombardi John R
John Jay College of Criminal Justice, CUNY, 445 West 59th Street, New York, NY 10019, USA.
J Forensic Sci. 2009 Jul;54(4):947-52. doi: 10.1111/j.1556-4029.2009.01058.x. Epub 2009 Apr 24.
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.
在一项对比研究中，对拉曼光谱和表面增强拉曼散射（SERS）用于分析圆珠笔油墨中常见合成染料的适用性进行了研究。在不同分析条件下（如粉末状颜料、溶液、薄层色谱 [TLC] 斑点），使用色散系统（633 nm、785 nm 激光）和傅里叶变换系统（1064 nm 激光）获得了 10 种染料的光谱。虽然所研究染料的常规拉曼光谱通常具有高荧光背景和较差的光谱质量，但发现 SERS 通常很有帮助。此外，按照典型的油墨分析程序在 TLC 板上制备了染料标准品和单一圆珠笔油墨。直接从 TLC 板上成功收集到了 SERS 光谱，从而证明了该技术在法医学上的一种可能应用。
