纳米纤维素
检出限
拉曼散射
材料科学
基质(水族馆)
胶体金
纳米技术
纳米颗粒
纤维素
化学工程
分析化学(期刊)
拉曼光谱
化学
色谱法
光学
工程类
地质学
物理
海洋学
作者
Jingjing Wu,Jianfeng Xi,Haibo Chen,Sijie Li,Lei Zhang,Peng Li,Weibing Wu
标识
DOI:10.1016/j.carbpol.2021.118890
摘要
Nanocellulose holds considerable promise as an effective surface-enhanced Raman scattering (SERS) substrate for sensitive detection of trace targets. Flexible and high-sensitivity two-dimensional (2D) SERS substrates based on nanocrystalline cellulose (CNC) film were successfully developed via self assembly of two plasma nanoparticles: gold nanoflowers (AuNFs) and silver-coated gold nanocubes (Au@AgNCs). The loading process allows the precise control of nanoparticle distribution density and uniformity on CNC film, which are closely related to the plasma coupling effect between particles. The obtained CNC/Au@AgNC flexible two-dimensional substrate could sensitively detect pesticide residues on apple surface, and the detection limits (LOD) of dimethoate and acetamiprid were 4.1 and 10.7 μg/L, respectively. In addition, Raman signal intensity showed a good linear relationship with pesticide concentration in the range of 10-100 μg/L, which provided great potential for high sensitivity and field detection of dangerous targets.
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