期刊
CARBOHYDRATE POLYMERS
卷 277, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118890
关键词
Nanocellulose; Flexible substrate; Surface enhanced Raman scattering; Sensor; Pesticide
资金
- National Key Research and Development Program of China [2019YFC19059003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Flexible and high-sensitivity two-dimensional SERS substrates based on self-assembled gold nanoflowers and silver-coated gold nanocubes were successfully developed on nanocrystalline cellulose film. The substrate could sensitively detect pesticide residues on apple surface and showed a linear relationship with pesticide concentration in the range of 10-100 mu g/L.
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 mu g/L, respectively. In addition, Raman signal intensity showed a good linear relationship with pesticide concentration in the range of 10-100 mu g/L, which provided great potential for high sensitivity and field detection of dangerous targets.
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