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. 2022 Sep 21;12(19):3277.
doi: 10.3390/nano12193277.

Improving Minutiae Image of Latent Fingerprint Detection on Non-Porous Surface Materials under UV Light Using Sulfur Doped Carbon Quantum Dots from Magnolia Grandiflora Flower

David Nugroho  1 , Won-Chun Oh  2 , Saksit Chanthai  3 , Rachadaporn Benchawattananon  1
Affiliations

Improving Minutiae Image of Latent Fingerprint Detection on Non-Porous Surface Materials under UV Light Using Sulfur Doped Carbon Quantum Dots from Magnolia Grandiflora Flower

David Nugroho et al. Nanomaterials (Basel). .

Abstract

In this study, carbon quantum dots (CQDs) from Magnolia Grandiflora flower as a carbon precursor were obtained using a hydrothermal method under the optimized conditions affected by various heating times (14, 16, 18, and 20 min) and various electric power inputs (900-1400 W). Then, hydrogen sulfide (H2S) was added to dope the CQDs under the same manner. The aqueous solution of the S-CQDs were characterized by FTIR, XPS, EDX/SEM, and TEM, with nanoparticle size at around 4 nm. Then, the as-prepared S-CQDs were successfully applied with fine corn starch for detection of minutiae latent fingerprints on non-porous surface materials. It is demonstrated that the minutiae pattern is more clearly seen under commercial UV lamps with a bright blue fluorescence intensity. Therefore, this research has proved that the S-CQDs derived from plant material have a better potential as fluorescent probes for latent fingerprint detection.

Keywords: carbon dots; forensic science; latent fingerprint; minutiae pattern; nanoparticle.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
FTIR of (a) CQDs, (b) S-CQDs, and (c) S-CQDs/starch.
Figure 2
Figure 2
XRD of (a) CQDs, (b) S-CQDs, and (c) S-CQDs/starch.
Figure 3
Figure 3
XPS of (a) survey spectrum of S-CQDs, (b) C1s, (c) S2p, and (d) O1s peaks.
Figure 4
Figure 4
FIB-SEM of (a) CQDs, (b) S-CQDs, and (c) S-CQDs/starch; EDX of (d) S-CQDs; TEM of (e)-CQDs.
Figure 5
Figure 5
Synthesis optimization of S-CQDs: (a) Uv–Vis of the effect of heating time, (b) Uv–Vis of the effect of H2S on absorption of CQDs, (c) Uv–Vis of the effect of hydrothermal treatment (W), (d) FL Spectrophotometer of optimum condition (S/W:5/5).
See this image and copyright information in PMC

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