Red Fluorescent Carbon Dot Powder for Accurate Latent Fingerprint Identification using an Artificial Intelligence Program

Abstract

Development and comparison of the latent fingerprints (LFPs) are two major studies in detection and identification of LFPs, respectively. However, integrated research studies on both fluorescent materials for LFP development and digital-processing programs for LFP comparison are scarcely seen in the literature. In this work, highly efficient red-emissive carbon dots (R-CDs) are synthesized in one pot and mixed with starch to form R-CDs/starch phosphors. Such phosphors are comparable with various substrates and suitable for the typical powder dusting method to develop LFPs. The fluorescence images of the developed LFPs are handled with an artificial intelligence program. For the optimal sample, this program presents an excellent matching score of 93%, indicating that the developed sample has very high similarity with the standard control. Our results are significantly better than the benchmark obtained by the traditional method, and thus, both the R-CDs/starch phosphors and the digital processing program fit well for the practical applications.

Applications of Carbon Dots (CDs) in Latent Fingerprints Imaging

“…Recently, Xiong and his team established fluorescent red CD (R-CD) powder for accurate latent FP detection by using an artificial intelligence program. [61] The fluorescent R-CDs were prepared using citric acid, p-phenylenediamine and phytic acid followed by mixing with starch to obtain R-CDs/starch phosphors. The developed latent FPs on different substrates, such as glass, paper, and plastic surface clearly visible under green light, particularly on glass and paper surface (Figure 22A-C).…”

“…Reproduced with permission. [61] Copyright 2020, American Chemical Society. 3) termination in the partially enlarged images, are converted from (e) input image to (f) binary image, (g) comparative study of three different substrates using black ink, (h) similarity assessment results of the same fingerprint on different substrates and achievement of benchmark by the standard fuming method.…”

“…(d) magnified images show FPs details up to third level as marked in A, (e) confocal fluorescence microscopy images of R-CDs/starch-stained FPs deposited on a glass sheet and (f) same fingerprint after several weeks' storage. Reproduced with permission [61]. Copyright 2020, American Chemical Society.…”

“…The second-level details, (1) island, (2) bifurcation, and (3) termination in the partially enlarged images, are converted from (e) input image to (f) binary image, (g) comparative study of three different substrates using black ink, (h) similarity assessment results of the same fingerprint on different substrates and achievement of benchmark by the standard fuming method. Reproduced with permission [61]. Copyright 2020, American Chemical Society.…”

Enhanced Fluorescence and Environmental Stability of Red-Emissive Carbon Dots via Chemical Bonding with Cellulose Films

“…In the latest reports, a physical blending of the highly efficient red-emissive CDs with starch particles was carried out to form R-CDs/starch phosphors for latent fingerprints. 14 Also, inorganic minerals of mesoporous aluminas (MAs) were applied as a substrate to combine with carbon dots. 15 Two kinds of carbon dots were restricted within the substrate pores after stirring with MAs, and emissions originating from both blue and red CDs were retained.…”