NIR-induced highly sensitive detection of latent finger-marks by NaYF₄:Yb,Er upconversion nanoparticles in a dry powder state.

ABSTRACT: The most commonly found fingermarks at crime scenes are latent and, thus, an efficient method for detecting latent fingermarks is very important. However, traditional developing techniques have drawbacks such as low detection sensitivity, high background interference, complicated operation, and high toxicity. To tackle this challenge, we employed fluorescent NaYF₄:Yb,Er upconversion nanoparticles (UCNPs), which can fluoresce visible light when excited by 980 nm human-safe near-infrared light, to stain the latent fingermarks on various substrate surfaces. The UCNPs were successfully used as a novel fluorescent label for the detection of latent fingermarks with high sensitivity, low background, high efficiency, and low toxicity on various substrates including non-infiltrating mate

SUBMITTER: Wang M 

PROVIDER: S-EPMC5091657 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature