Visualization and Analysis of Sweat Pore Features in Latent Fingerprints Using Core-Shell Structured Composite Nanofibrous Membrane
10.19756/j.issn.0253-3820.251127
- VernacularTitle:基于核壳结构静电纺丝膜的潜指印汗孔特征显现与分析
- Author:
Shi-Yue MA
1
;
Ya-Li PEI
;
Hong-Yu CHEN
;
Xin DU
;
Yan-Feng ZHANG
;
Rong-Liang MA
;
Mei-Qin ZHANG
Author Information
1. 北京科技大学化学与生物工程学院,生物工程与传感技术北京市重点实验室,北京 100083
- Keywords:
Latent fingerprint visualization;
Sweat pores;
Fibrous membrane;
Hydroluminescence enhancement;
Coaxial electrospinning
- From:
Chinese Journal of Analytical Chemistry
2025;53(8):1269-1278
- CountryChina
- Language:Chinese
-
Abstract:
Introducing fingerprint level 3 features(especially sweat pores)in fingerprint recognition can significantly improve the value of fingerprints.However,conventional fingerprint visualization methods suffer from issues such as poor stability and reproducibility,insufficient resolution,and feature masking in detecting level 3 features.Electrospun membrane has unique advantages in latent fingerprint(LFP)detection due to its excellent adsorption performance and high specific surface area,and thus its application potential in LFP visualization urgently need to be explored.A novel pore visualization method based on core-shell structured PAN-Flu/PVP composite nanofibrous membrane was proposed in this work.Specifically,the PAN-Flu/PVP composite nanofibrous membrane was prepared via coaxial electrospinning technology,with polyacrylonitrile(PAN)loaded with fluorescein(Flu)as the core and polyvinylpyrrolidone(PVP)as the shell.The experimental results showed that the prepared PAN Flu/PVP composite nanofibrous membrane had a porous structure and excellent adsorption performance.Based on the water solubility of the outer shell PVP and the water induced fluorescence enhancement effect of the core Flu,high-resolution visualization of sweat pores could be achieved within 2 s.The optimization experiment showed that the best quality of sweat latent fingerprints was obtained when the Flu content was 4 mg/mL,the spinning time was 1 h,and the sweating time was 2 min.Through repeated fingerprinting and live fingerprint comparison experiment,the strong stability and high reproducibility of the as-produced membrane in displaying fingerprint sweat pores were finally verified.In summary,the development method could quickly,stably and accurately extract the spatial distribution and activity level of fingerprint sweat pores,which was of great significance for improving the utilization and value of fingerprints.
