聚乙烯醇
荧光
材料科学
复合数
透射率
纳米技术
化学工程
碳纤维
光电子学
复合材料
光学
物理
工程类
作者
Xingyu Tao,Meng Liao,Fengxia Wu,Yuheng Jiang,Jianping Sun,Shaohong Shi
标识
DOI:10.1016/j.cej.2022.136442
摘要
Carbon quantum dots (CQDs) have attracted extensive attentions because of their unique luminescent properties and promising prospects in intelligent sensing and detection. However, the increasing environmental pollution caused by chemical substances for synthesizing illuminants limits their expansion in practical applications. Herein, we employed a facile and green synthesis strategy to extract biomass-derived CQDs from natural lignocellulose. The obtained CQD nanoparticles not only showed excellent fluorescent performance, but also posed desirable environmental-friendly characteristic. Moreover, to relieve the fluorescence quenching induced by CQDs aggregation, the well-dispersed [email protected] alcohol ([email protected]) composite film with strong hydrogen-bond interaction was successfully fabricated. The resultant film exhibited high transparency (transmittance of 88%), excellent mechanical flexibility (tensile strength of 39.7 MPa and elongation at break of 453%), and exceptional fluorescence performance. The high concentrated emitting centered in 502 nm emission wavelength was realized in a wide excitation range of 350 ∼ 420 nm with high-stability turquoise fluorescence. More impressively, this fluorescent film demonstrated a sensitive pH-responsiveness, i.e., the fluorescent intensity varied upon pH stimulation. As a proof-of-concept, an intelligent pH-detector based on this fluorescent film was rationally designed for real-time sensing and detection of pH variation in human sweat during movement processing. From fundamental materials to desired applications, this study not only enriches the synthetic strategy of illuminants in an environment-friendly manner, but also paves the way for further applications in wearable, real-time health monitoring.
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