材料科学
生物相容性
荧光
光致发光
量子产额
纳米材料
纳米技术
碳纤维
热稳定性
猝灭(荧光)
发光
碳化
量子点
生物成像
化学稳定性
化学工程
光电子学
复合材料
扫描电子显微镜
复合数
光学
物理
工程类
冶金
作者
Waheed Ullah Khan,Lu-Ping Qin,Ping Zhou,Ahm Zahirul Alam,Zhangjie Ge,Yuhua Wang
标识
DOI:10.1021/acsami.3c09688
摘要
Carbon dots are emerging fluorescent nanomaterials with unique physical and chemical properties and a wide range of applications. Herein, we have designed and successfully synthesized thermally stable green emissive nitrogen-doped carbon dots (NCDs) with a photoluminescent quantum yield of 11.32% through facile solvent-free carbonization. NCDs demonstrated zero thermal quenching upon various temperatures modulating from 20 to 80 °C. The green emissive NCDs perform very stably even after heating them at 80 °C for 1 h. The thermal stability mechanism demonstrates that C═O and C═N functional groups control the particle aggregation and protect the fluorescent hub from photo-oxidation and thermal oxidation. Highly biocompatible CDs exhibit bright, stable, and multicolor emissions in T-ca cells under hot circumstances (25–45 °C). Additionally, NCDs offer long-term stability in the biosystem, as evidenced by the fact that the cell retains its brightness about 70% after prolonging the incubation time to 8 days. Furthermore, the fluorescent NCDs are utilized as in vivo imaging agents in the hot environment as they display bright and thermally stable imaging (27–45 °C) under 488 nm excitation. The results confirmed that the produced thermally stable NCDs could be used in biology and related medical fields that require hot environment imaging.
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