文献类型：期刊文献

英文题名：Solvent-free pyrolysis synthesis of solid-state fluorescent carbon dots: Optical properties and latent fingerprint imaging

作者：Luo, Kun[1,2];Li, Wanjun[1];Luo, Xiaoke[1];Kang, Xinhuang[1];Wen, Yanmei[1]

机构：[1]Guangdong Ocean Univ, Fac Chem & Environm Sci, Zhanjiang 524088, Peoples R China;[2]China Univ Geosci, Sch Sci, Beijing 100083, Peoples R China

年份：2024

卷号：142

外文期刊名：DIAMOND AND RELATED MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001171283500001)、、EI(收录号：20240415429917)、Scopus(收录号：2-s2.0-85182913225)、WOS

基金：The authors declare that only ChatGPT was used to check the language and no content was written. We would like to thank the researchers at the Shiyanjia Lab ( www.shiyanjia.com ) for their assistance with material characterization. This research was funded by the Natural Science Foundation of Guangdong Province (No. 2021A1515010304) , the Enhancing School with Innovation of Guangdong Ocean University (No. 230419054) , and the Laboratory of Marine Chemistry Resource Utilization and Research (No. Q17092) .

语种：英文

外文关键词：Carbon dots; Solid-state fluorescent; Solvent -free; Pyrolysis; Multicolor

外文摘要：Carbon dots (CDs) have garnered significant attention due to their remarkable optical properties and low cytotoxicity. However, most studies on CDs have predominantly focused on their fluorescence behavior in solution, because their pi-pi stacking interactions, fluorescence resonance energy transfer, and surface electron transitions can induce fluorescence quenching through aggregation. In this investigation, three variants of solidstate fluorescent CDs were synthesized using a solvent-free pyrolysis technique under atmospheric pressure at 200 C-degrees. In the solvent-free CDs syntheses, urea as a dispersant, while the carbon precursors (m-phenylenediamine, DL-aspartic acid, and p-phenylenediamine) were diversified. The photoluminescence quantum yields of the resultant blue-, yellow-, and red-emitting CDs powders were measured to be 11.62, 3.59, and 0.57 %, respectively. Radiative transitions resulting from the eigenstates of CDs dominate. Fluorescence decay studies suggested that radiative transitions resulting from the eigenstates of the CDs dominate as the emission maximum shifts to the red region. These CDs exhibit outstanding solid-state fluorescence, enabling their successful utilization in latent fingerprinting imaging. Remarkably, the red-emitting CDs also exhibited blue room-temperature phosphorescence, observable for 3 s.