石墨烯量子点与纤维素构筑的蓝色发光水凝胶研究

Construction of Blue-emissive Cellulose Hydrogels with Graphene Quantum Dots

以氢氧化钠/尿素为溶剂溶解微晶纤维素,在溶解过程中原位引入高量子产率的蓝光石墨烯量子点(GQDs),制备了GQDs/纤维素发光水凝胶。我们发现交联剂的用量增加,复合水凝胶的力学强度增大,透光率减小,溶胀率减小,GQDs释放速率减小,但是光谱仍保持稳定。Fe3+对GQDs/纤维素水凝胶具有荧光猝灭特性。我们相信,这种基于天然生物资源的发光水凝胶为化学和生物传感器的设计提供了低成本、多样化、环境友好的选择。

Microcrystalline cellulose（ MCC） was dissolved in Na OH / urea solvent,and graphene quantum dots（ GQDs） with high quantum yield were introduced in situ,then luminescent GQDs/cellulose hydrogels were obtained. As the amount of crosslinking agent increased, the mechanical strength of the composite hydrogels increased, the transmittance decreased,the swelling ratio decreased,and release rate decreased,but the spectrum remained stable. In addition,composite hydrogels were found to be sensitive and exhibit fluorescent quenching to a variety of metal ions,especially Fe3＋. Thus,such luminescent hydrogel based on natural biological resources provided low cost,versatile and environmental friendly candidate for chemical and biological sensor.