光谱学与光谱分析, 2019, 39 (4): 1154, 网络出版: 2019-04-11  

基于明胶制备碳量子点及其光学性能的研究

Synthesis of Carbon Quantum Dots Based on Gelatin and Study on It’s Optical Property
作者单位
1 陕西科技大学轻工科学与工程学院轻化工程国家级实验教学示范中心, 陕西 西安 710021
2 陕西科技大学化学与化工学院, 陕西 西安 710021
摘要
通过水热法采用热解明胶制备出有蓝色荧光的碳量子点, 并通过单因素优化实验对制备碳量子点的温度、 时间进行优化以选择出制备碳量子点的最佳条件, 结果表明在水热反应温度为200 ℃, 反应时间为6 h时制备的碳量子点的荧光性能最强。 同时, 利用透射电子显微镜(TEM)、 傅里叶变换红外光谱(FTIR)、 X射线光电子能谱(XPS)、 X射线衍射(XRD)、 紫外-可见吸收光谱(UV)及荧光光谱(PL)等手段对最佳条件下制备的碳量子点进行测试与表征, 结果表明, 该方法制备的碳量子点量子产率为39.4%, 与不掺杂的碳量子点相比其量子产率相对较高, 这可能是因为有N元素的存在使得量子产率有所提高; 所制备的碳量子点不仅具有丰富的含氧官能团而且抗光漂白性能良好, 形态主要是均匀分散的球形, 没有明显的晶格条纹, 这与相关文献报道的碳量子点的形态相一致, 其在250~300 nm有较弱的吸收, 但无明显的特征吸收峰, 这可能是由于CO基团的n—π*跃迁引起的; 此外, 还讨论了氙灯照射时间、 pH、 碳量子点浓度、 不同类型溶剂及离子强度等因素对碳量子点荧光性能的影响, 研究结果表明, 氙灯照射时间及离子强度对碳量子点荧光性能几乎无影响, 在过酸或过碱的条件下其荧光强度相对较弱, 原因可能是在过酸或过碱的条件下发生质子化或非质子化的作用导致其荧光强度减弱; 且碳量子点溶液随着其浓度的增加, 荧光强度先增加后减小; 而对于溶剂类型而言, 其在极性溶剂中的荧光强度大于其在非极性溶剂中的荧光强度, 说明该方法制备的碳量子点具有良好的水溶性。
Abstract
In this article, the blue luminescent carbon quantum dots (CQDs) were prepared by hydrothermal method using pyrolysis of gelatin. The temperature, time of the prepared CQDs were optimized via single-factor experiments to select the optimal conditions for the preparation of CQDs. The results showed that fluorescence of carbon quantum dots was the strongest when the carbonization temperature was 200 ℃, and time was 6 h. At the same time, the obtained carbon quantum dots under the optimal conditions was characterized by transmission electron microscope (TEM), UV-visible spectroscopy, photoluminescence spectroscopy (PL), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), the result indicating that the quantum yield of carbon quantum dots prepared by this method is 39.4%, and the quantum yield is relatively higher than that of carbon quantum dots that do not doped, which may be due to the presence of N elements that increase the quantum yield, and the prepared carbon quantum dots not only have rich oxygen-containing functional groups but also have good photobleaching performance, and the morphology of the carbon quantum dots is mainly spherical with uniform dispersion and no obvious lattice fringes, which is consistent with the morphology of the carbon quantum dots reported in related literatures; And the carbon quantum dots had weak absorption at 250~300 nm, but there was no obvious characteristic absorption peak, which may be due to the n—π* transition of the CO group; In addition, the pH, the Xenon lamp irradiation time, the concentration of carbon quantum dots, the type of solvent, andionic strengthon the fluorescence properties of carbon quantum dots were discussed. The results showed that the irradiation time of the xenon lamp and ionic strength had little effect on the fluorescence performance of the carbon quantum dots. The fluorescence intensity is relatively weak under peracid or overbase conditions, which may be due to protonated or non-protonated effects resulting in decreased fluorescence intensity under peracid or overbase conditions. And as the concentration of the carbon quantum dots increased, the fluorescence intensity increased first and then decreased. For the solvent type, the fluorescence intensity in the polar solvent was greater than the fluorescence intensity in the non-polar solvent which indicated that the carbon quantum dots had good water solubility by this method.

王学川, 白鹏霞, 罗晓民, 李季. 基于明胶制备碳量子点及其光学性能的研究[J]. 光谱学与光谱分析, 2019, 39(4): 1154. WANG Xue-chuan, BAI Peng-xia, LUO Xiao-min, LI Ji. Synthesis of Carbon Quantum Dots Based on Gelatin and Study on It’s Optical Property[J]. Spectroscopy and Spectral Analysis, 2019, 39(4): 1154.

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