Citation: Mei-Han DONG, Feng LI, Yong-Juan XU, Yan-Chao DONG, Min-Hao LI, Chui-Long KONG, Xin-Yang CHEN, Jiu-Yan YANG, Jia-Yi SUN. Phosphorescent carbon dots powder: Synthesis and application in anti-background interference latent fingerprint imaging[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(8): 1527-1535. doi: 10.11862/CJIC.2023.098 shu

Phosphorescent carbon dots powder: Synthesis and application in anti-background interference latent fingerprint imaging

Department of Chemistry, Normal College, Shenyang University, Shenyang, 110044, China

Corresponding author: Feng LI, syufengli@126.com
Received Date: 27 January 2023
Revised Date: 18 May 2023

Figures(9)

In this work, fluorescent carbon dots (CDs) solution was prepared via a hydrothermal method with ethylenediamine, phosphoric acid, and boric acid as starting materials. Subsequently, the obtained solution was heated at 180 ℃ for 5 h to get phosphorescent CDs powder. The structure, morphology and size, surface groups and chemical compositions, and optical properties of as-prepared CDs were then characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible absorption spectroscopy, and photoluminescence spectra. The results showed the synthesized CDs were amorphous carbon structure, well-dispersed, and sphere-like in shape with a diameter of 3.78-7.64 nm. CDs were rich in heteroatom groups containing N, P, and B on the surface. Under 365 nm UV light irradiation, the CDs powder exhibited bright blue fluorescence, and green room-temperature phosphorescence (RTP) was observed for up to 10 s after switching off the 365 nm light irradiation. The as-obtained CDs powder as an efficient fingerprint reagent was successfully used for developing latent fingerprints (LFPs) on substrates with complex background patterns and strong background fluorescence. After turning off the 365 nm UV light, the clear whole fingerprint shapes with well-defined details can be observed. The background patterns and background fluorescence interference were efficiently eliminated by capturing the phosphorescent latent fingerprint images. Meanwhile, the developed 7-day-old LFPs on various substrates with strong background interference showed well-resolved green ridge flow phosphorescence fingerprint patterns.
- phosphorescence,
- carbon dots,
- latent fingerprints
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