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Citation: LI Wen-Jie, SUN Ling-Hui, YOU Wei, WANG Li-Xue, ZHAO Ya-Bin, LI Zhan-Ping. Chemical Imaging of Fingerprint on RMB Banknotes Using Time-of-Flight Secondary Ion Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(11): 1511-1518. doi: 10.19756/j.issn.0253-3820.201350 shu

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

LI Wen-Jie ¹ ,
SUN Ling-Hui ¹ ,
YOU Wei ¹ ,
WANG Li-Xue ¹ ,
ZHAO Ya-Bin ^1,, ,
LI Zhan-Ping ^2,3,,

1.
Academy of Investigate, People's Public Security University of China, Beijing 100038, China;
2.
Analysis Center, Tsinghua University, Beijing 100084, China;
3.
Department of Chemistry, Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China

Corresponding author: ZHAO Ya-Bin, LI Zhan-Ping,
Received Date: 15 June 2020
Revised Date: 14 September 2020

Fund Project: This work was supported by the Basic Research Project of People's Public Security University of China (No. 2019JKF216) and the National Key R&D Program of China (No. 2018YFA0702600).

The development of latent fingerprints on long-circulated RMB banknotes has been one of the difficulties 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 surfaces of the substrates 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. Secondly, 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 technique 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 technique 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 the substrates.
- Time-of-flight secondary ion mass spectrometry,
- RMB banknotes,
- Fingerprint analysis,
- Chemical imaging
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