季胺化壳聚糖修饰黑磷纳米片的制备及其稳定性与光热性质研究

Study on preparation and the stability and photothermal property of BPNs-QCS

黑磷(BP)作为一种新兴的二维材料,在太阳能电池、光伏电器和光热治疗等领域有着良好的应用前景。然而,BP微纳结构的化学性质不够稳定,极大地限制了它的应用。利用超声辅助液相剥离技术和静电吸附法的方法在BP纳米片(BPNs)表面吸附一层季胺化壳聚糖(QCS),制备得到BPNs-QCS。以透射电镜和纳米粒度仪等对其微观结构进行表征,利用吸收光谱研究材料的稳定性,并利用光热成像仪研究QCS修饰前后材料的光热转换性能。结果表明,QCS的修饰明显改善了BPNs在水溶液中的稳定性,并且在提高稳定性的同时不会影响原本的微观结构和光热性质。

As a new 2 D material,black phosphorus(BP)has good application prospects in solar cells,photovoltaic appliances,and photothermal therapy.However,the chemical properties of its micro-nano structure are not stable enough,which limits its extensive applications.Quaternized chitosan(QCS)modified BP nanosheets(named as BPNs-QCS)were prepared using ultrasonic-assisted liquid-phase exfoliation technology and electrostatic adsorption method.The microstructure was characterized by transmission electron microscopy(TEM)and nanometer particle size analyzer.The stability of the material was studied by absorption spectroscopy,and the light-to-heat conversion performance before and after QCS modification was studied by photothermal imager.The results showed that the modification of QCS significantly improved the stability of BPNs in aqueous solution without affecting the original microstructure and photothermal properties.