钝化
光致发光
量子产额
材料科学
生物量(生态学)
碳化
水热碳化
碳纤维
绿色化学
纳米技术
化学工程
荧光
分子
有机化学
化学
光电子学
扫描电子显微镜
复合材料
超分子化学
光学
农学
图层(电子)
复合数
生物
物理
工程类
作者
Zicheng Liang,Lei Zeng,Xiaodong Cao,Qun Wang,Xiaohui Wang,Run‐Cang Sun
摘要
High quality blue fluorescent carbon quantum dots (CDs) were fabricated from a dilute NH4OH/water solution of waste biomass via one-step hydrothermal carbonization. Different from conventional synthesis methods, NH4OH was used as the solvent as well as passivation agent rather than organic amine compounds. The best quantum yield (QY) of the nitrogen-doped biomass CDs was up to 16%, which was higher than the non-doped CDs (only 2%) and those passivated by organic molecules (7%). Further investigations revealed the unique emission behaviours of the NH4OH-passivated CDs dependent on excitation, pH values and solvents and interesting up-conversion photoluminescence. In addition, an in vitro cytotoxicity test demonstrated the negligible toxicity of NH4OH-passivated CDs, and they were successfully applied in bio-imaging of murine embryonic stem cells. This low-cost and green chemistry method provides a feasible route for value-added and sustainable utilization of waste biomass.
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