Flexible 2D nanocellulose-based SERS substrate for pesticide residue detection

Jingjing Wu; Jianfeng Xi; Haibo Chen; Sijie Li; Lei Zhang; Peng Li; Weibing Wu

doi:10.1016/j.carbpol.2021.118890

Flexible 2D nanocellulose-based SERS substrate for pesticide residue detection

Carbohydr Polym. 2022 Feb 1:277:118890. doi: 10.1016/j.carbpol.2021.118890. Epub 2021 Nov 15.

Authors

Jingjing Wu¹, Jianfeng Xi¹, Haibo Chen², Sijie Li¹, Lei Zhang³, Peng Li², Weibing Wu⁴

Affiliations

¹ Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China.
² School of Electronic and Information Engineering, Soochow University, Suzhou 215000, Jiangsu, China.
³ Key Laboratory for Organic Electronics and Information, National Jiangsu Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China. Electronic address: iamlzhang@njupt.edu.cn.
⁴ Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China. Electronic address: wbwu@njfu.edu.cn.

PMID: 34893292
DOI: 10.1016/j.carbpol.2021.118890

Abstract

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.

Keywords: Flexible substrate; Nanocellulose; Pesticide; Sensor; Surface enhanced Raman scattering.