• Kirada Khanbo
  • Kittidhaj Dhanasiwawong
  • Kheamrutai Thamaphat
  • Siriprapa Rattanyu
  • Surin Chomsaohus
  • Patchara Sinloyma
  • Pichet Limsuwan


fluorescent powder, latent fingerprints, rice husk, silica nanoparticles, rhodamine 6G


In this work, the fluorescent powders were synthesized using green method for enhancing the visualization of latent fingerprints (LFPs) on physical evidence surfaces. Rice husks, which are one of the major agricultural wastes, were used to synthesize silica nanoparticles (SiNPs) with high purity up to 99.8%. The prepared SiNPs were subsequently coated with fluorescent dyes called rhodamine 6G to obtain the fluorescent silica nanoparticles (SiNPs-R6G) with an average diameter of 25 ± 1 nm. The synthesized SiNPs-R6G were powders in orange color. They were used for the detection of fresh LFPs with non-dusting technique. The results showed that the SiNPs-R6G could efficiently enhance the visualization of LFPs on porous surfaces, semi-porous surfaces, and non-porous surfaces. The best visual contrast of the yellow fingerprints (570 nm) on both smooth and rough surfaces was imaged using orange filter with digital camera under the beam of Polilight with a wavelength of 505 nm. The resultant findings indicated that the developed fluorescent powders and LFPs detection technique proposed herein can be used for criminal investigation in forensic science.  


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บทความวิจัย (Research Article)