X射线光电子能谱
拉曼光谱
荧光
傅里叶变换红外光谱
核化学
光谱学
透射电子显微镜
分析化学(期刊)
碳纤维
化学
材料科学
荧光光谱法
纳米技术
化学工程
有机化学
物理
光学
复合数
复合材料
量子力学
工程类
作者
Raji Atchudan,Thomas Nesakumar Jebakumar Immanuel Edison,Mathur Gopalakrishnan Sethuraman,Yong Rok Lee
标识
DOI:10.1016/j.apsusc.2016.05.054
摘要
Highly fluorescent nitrogen-doped carbon dots (N-CDs) were synthesized using the extract of unripe Prunus mume (P. mume) fruit by a simple one step hydrothermal-carbonization method. The N-CDs were synthesized at different pH ranges, 2.3, 5, 7, and 9. The pH of the P. mume extract was adjusted using an aqueous ammonia solution (25%). The optical properties of N-CDs were examined by UV–vis and fluorescence spectroscopy. The N-CDs synthesized at pH 9 emitted high fluorescence intensity compared to other obtained N-CDs. The N-CDs synthesized at pH 9 was further characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and Fourier transform-infra red (FT-IR) spectroscopy. HR-TEM showed that the average size of the synthesized N-CDs was approximately 9 nm and the interlayer distance was 0.21 nm, which was validated by XRD. The graphitic nature of the synthesized N-CDs were confirmed by Raman spectroscopy. XPS and FT-IR spectroscopy confirmed the doping of the nitrogen moiety over the synthesized CDs. The synthesized nitrogen doped CDs (N-CDs) were low toxicity and were used as a staining probe for fluorescence cell imaging.
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