Dual Colorimetric and Fluorescent Imaging of Latent Fingerprints on Both Porous and Nonporous Surfaces with Near-Infrared Fluorescent Semiconducting Polymer Dots.
Semiconducting polymer dots (Pdots) have recently been proven as a novel type of ultrabright fluorescent probes that can be extensively used in analytical detection. Here, we developed a dual visual sensor based on Pdots for fingerprint imaging. We first designed and synthesized two types of near-infrared (NIR) fluorescent polymers and then embedded ninhydrin into the Pdot matrix. The resulting Pdot assays showed the colorimetric and fluorescent dual-readout abilities to detect latent fingerprints on both porous and nonporous surfaces. The developed fingerprints clearly revealed first-, second-, and third-level details with high contrast, high selectivity, and low background interference. We also grafted the chemical groups on the nanoparticle surface to investigate the mechanisms involved in the fingerprint development processes. We further utilized this assay in note paper and checks for latent fingerprint imaging. We believe that this dual-readout method based on Pdots will create a new avenue for research in fingerprint detection and anticounterfeiting technology.
You-Hong
YH
Chen
Shih-Yu
SY
Kuo
Wei-Kai
WK
Tsai
Chi-Shiang
CS
Ke
Chia-Hsien
CH
Liao
Chuan-Pin
CP
Chen
Department of Biochemistry, College of Medicine, Kaohsiung Medical University , 100 Tzyou First Road, Kaohsiung, Taiwan 807.
Yeng-Tseng
YT
Wang
Department of Chemistry, National Sun Yat-sen University , 70 Lien Hai Road, Kaohsiung, Taiwan 80424.
Hsiu-Wei
HW
Chen
Department of Chemistry, National Sun Yat-sen University , 70 Lien Hai Road, Kaohsiung, Taiwan 80424.
Yang-Hsiang
YH
Chan