Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 23, Pages 14389-14395Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03352
Keywords
latent fingerprints; SERS imaging; sandwich structure; aptamers; lysozyme
Funding
- National Natural Science Foundation of China [21175028, 21375022]
- China Postdoctoral Science Foundation [2015M580287]
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Although fingerprints have been widely used in forensic investigations, low resolution and poor universality are still the main obstacles for the development of fingerprint visualization. In this paper, a facile and universal imaging protocol for latent fingerprints (LFPs) was developed by combining sandwiched SERS probes with the highly sensitive and selective recognition of aptamers. The embedded SERS probes (Au/pNTP/SiO2) successfully avoid the environment interference, ascertaining the stability and reproducibility of Raman signals, and simultaneously improve the efficiency of the fingerprint identification. This approach is operationally simple without complicated pre- or post-treatments. Moreover, the fingerprint images display the high resolution in which third-level details can be clearly identified. This is a general approach and can be used to detect various types of fingerprints, including sebaceous, eccrine, fresh LFPs, and aged LFPs on different substrates (such as smooth, scratching; semiporous, and porous surfaces).
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