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Abstract
Surface Enhanced Raman is a promising analytical method for harmful pesticides detection. Herein, we demonstrate a rapid method to directly monitor 2,4-D pesticide in water without the need of sample pre-treatment by using Silver-Gum Arabic (Ag-GA) electrochemically co-deposited SERS substrates. The facile electrochemical synthesis of the large-area (40 µm x 20 µm) SERS substrates needs only 10 seconds, with 2 μL AgNO3 and Gum Arabic mixed solution. Different mor-phologies including Ag-GA spherical nanoparticles and nano dendrites were synthesized by tuning the deposition parame-ters. This study therefore offers a novel way to fabricate SERS substrates for rapid determination of 2,4-D pesticides down to 1 pM in deionized water and 0.15 nM in commercial bottled and also river water samples
Supplementary materials
Title
Highly Sensitive Pesticide Detection using Electrochemically Prepared Silver-Gum Arabic Nanocluster-based SERS Substrates
Description
SI includes figures about chip fabrication process, electrochemical deposition setup, chip circuit design, saccharides structure in Gum Arabic, SEM images for SERS substrate optimization, current-time plot and optical images for Ag-GA SERS substrate deposition, SERS spectra for Ag-GA bare substrate in air and in DI water, data process by Matlab, the linear calibration for commercial Gum Arabic-Ag SERS substrate, tables for the literature comparison, table for the mineral water composition.
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