尼龙66基碳点的溶剂热法制备及其在指纹识别和荧光防伪中的应用

Preparation of nylon 66-based carbon dots by solvothermal method and its application in fingerprint recognition and fluorescence anti-counterfeiting

摘要:

为解决尼龙66（PA66）废弃物带来的环境污染及化石资源消耗的问题，以PA66和植酸（IP6）为前驱体、以乙酸为溶剂采用溶剂热法制备了PA66基碳点（66CDs），并对其结构、性能及应用进行了探究。结果表明：制备66CDs的较优条件：1.6 g的PA66、1.1 g的IP6及20 mL的CH3COOH加入50 mL对位聚苯酚水热釜中，置于260 ℃鼓风干燥箱中反应36 h。所制备的66CDs的荧光为非激发波长依赖型，最佳激发波长和最佳发射波长分别为360 nm和490 nm。就结构而言，66CDs为球形结构，平均粒径大小4.00 nm，表面含有羧基、羟基及氨基等官能团。此外，66CDs的荧光强度不受常见金属离子影响，抗干扰能力突出，可用于荧光防伪及指纹识别。

Abstract:

In order to solve the problem of environmental pollution and fossil resource consumption caused by nylon 66(PA66) waste, PA66 based carbon dots(66CDs) were prepared by solvothermal method with PA66 and phytic acid(IP6) as precursors and acetic acid as solvent. The structure, properties and application of PA66 were investigated. The results showed that the optimum conditions for the preparation of 66CDs were as follows:1.6 g PA66,1.1 g IP6 and 20 mL CH3COOH were added to 50 mL para polyphenol hydrothermal reactor and placed in 260 ℃ blast drying oven for 36 h. The fluorescence of the prepared 66CDs was wavelength independent, and the best excitation wavelength and the best emission wavelength were 360 nm and 490 nm, respectively. In terms of structure, 66CDs is spherical with an average particle size of 4.00 nm, and the surface contains carboxyl, hydroxyl, amino and other functional groups. In addition, the fluorescence intensity of 66CDs is not affected by common metal ions, and the anti-interference ability is outstanding, which can be used for fluorescence anti-counterfeiting and fingerprint recognition.