本文介绍了基于金胶的表面增强拉曼光谱技术快速原位检验黑色签字笔和中性笔的书写墨迹的方法。该方法在黑色书写墨迹上滴加自制金胶后,使用DXR显微激光拉曼光谱仪（780 nm激光器,10倍物镜）对黑色书写墨迹的表面增强拉曼光谱进行检测。对90种黑色签字笔和中性笔墨迹样本的分析结果显示,墨迹样本均可有效采集表面增强拉曼光谱,根据光谱信息,可将全部样本分为6大类,说明该技术可快速原位检验纸张上的黑色书写墨迹,同时为黑色书写墨迹的比对检验提供了新思路。

Surface-Enhanced Raman Spectroscopy (SERS) is a technique that extends the range of Raman applications to trace analysis. SERS has considerable benefits in the identification of forensic evidence, as it can quench fluorescence and provide significant differences, including peaks of different heights, shapes and shifting, together with the new peaks. This study presents a new method for the minimally invasive in situ analysis of handwriting from black roller and gel ink pen by the SERS based on concentrated gold colloid. Ninety brands of black roller and gel ink pens were collected to make their own handwriting samples on paper. The concentrated gold colloid was dropped onto the handwriting strokes, then the prepared samples were analyzed by DXR Raman microscope. All the SERS spectra were gathered under the same collection parameters of 780nm laser, 0.1mW laser power at sample, 10X objective of microscope, and dark-field illumination. The SERS spectrums of handwritings written by the 90 brands of black roller and gel ink pens can be classified into six kinds. SERS, based on gold colloid, is a powerful technique for the examiner to rapidly analyze the handwriting from black roller and gel ink pen, demonstrating suggestive for comparative examination of these handwritings.