Connatser R Maggie, Prokes Sharka M, Glembocki Orest J, Schuler Rebecca L, Gardner Charles W, Lewis Samuel A, Lewis Linda A
Oak Ridge National Laboratory, 1 Bethel Valley Road, Bldg. 4500N, Room F56, MS 6120, Oak Ridge, TN 37831, USA.
J Forensic Sci. 2010 Nov;55(6):1462-70. doi: 10.1111/j.1556-4029.2010.01484.x.
Exposure to light or heat, or simply a dearth of fingerprint material, renders some latent fingerprints undetectable using conventional methods. We begin to address such elusive fingerprints using detection targeting photo- and thermally stable fingerprint constituents: surface-enhanced Raman spectroscopy (SERS). SERS can give descriptive vibrational spectra of amino acids, among other robust fingerprint constituents, and good sensitivity can be attained by improving metal-dielectric nanoparticle substrates. With SERS chemical imaging, vibrational bands' intensities recreate a visual of fingerprint topography. The impact of nanoparticle synthesis route, dispersal methodology-deposition solvent, and laser wavelength are discussed, as are data from enhanced vibrational spectra of fingerprint components. SERS and Raman chemical images of fingerprints and realistic contaminants are shown. To our knowledge, this represents the first SERS imaging of fingerprints. In conclusion, this work progresses toward the ultimate goal of vibrationally detecting latent prints that would otherwise remain undetected using traditional development methods.
暴露于光或热下，或者仅仅是指纹材料不足，都会使一些潜在指纹无法用传统方法检测到。我们开始使用针对光和热稳定指纹成分的检测方法来处理这类难以捉摸的指纹：表面增强拉曼光谱法（SERS）。SERS可以给出氨基酸等其他稳定指纹成分的描述性振动光谱，并且通过改进金属-电介质纳米颗粒基底可以获得良好的灵敏度。通过SERS化学成像，振动带的强度可以重现指纹地形的可视化图像。讨论了纳米颗粒合成路线、分散方法-沉积溶剂和激光波长的影响，以及指纹成分增强振动光谱的数据。展示了指纹和实际污染物的SERS和拉曼化学图像。据我们所知，这是首次对指纹进行SERS成像。总之，这项工作朝着振动检测潜在指纹这一最终目标迈进，否则这些潜在指纹使用传统显影方法将仍然无法检测到。
