Chemical Imaging of Fingerprint on RMB Banknotes Using Time-of-Flight Secondary Ion Mass Spectrometry

Autor: Wen-Jie Li, Ling-Hui Sun, Zhan-Ping Li, Wei You, Li-Xue Wang, Ya-Bin Zhao
Rok vydání: 2020
Předmět:
Zdroj: Chinese Journal of Analytical Chemistry. 48:1511-1518
ISSN: 1872-2040
DOI: 10.1016/s1872-2040(20)60059-7
Popis: The development of latent fingerprints on long-circulated RMB banknotes has been one of the challenging task in forensic science research. In this work, time-of-flight secondary ion mass spectrometry (TOF-SIMS) was used to perform chemical imaging of latent fingerprints on the surface of the substrate due to its advantages such as in-situ, quasi-nondestructive, high-throughput, simultaneous analysis of multi-components and high spatial resolution. The developing effect of TOF-SIMS was firstly compared with that of several traditional methods, and the reasons for the unique advantages of TOF-SIMS were discussed. Its applicability was further discussed from the perspective of universality, sensitivity and fingerprint three-level feature acquisition capability. Finally, exogenous substances in fingerprints were also analyzed by using this technology to detect the molecular ions (m/z 92.06) and fragment ion peaks (m/z 43.02) of glycerol in the moisture lotion and developed clear fingerprint images. Preliminary research results showed that TOF-SIMS technology could provide an effective method for the development of latent fingerprints on long-circulated RMB banknotes and was expected to be used for the detection of substances in fingerprints on the surface of various substrates.
Databáze: OpenAIRE
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