Face-to-Face Assembly of Ag Nanoplates on Filter Papers for Pesticide Detection by Surface-Enhanced Raman Spectroscopy

Abstract

Surface-enhanced Raman spectroscopy (SERS) technology has been regarded as a most efficient and sensitive strategy for the detection of pollutants at ultra-low concentrations. Fabrication of SERS substrates is of key importance in obtaining the homogeneous and sensitive SERS signals. Cellulose filter papers loaded with plasmonic metal NPs are well known as cost-effective and efficient paper-based SERS substrates. In this manuscript, face-to-face assembly of silver nanoplates via solvent-evaporation strategies on the cellulose filter papers has been developed for the SERS substrates. Furthermore, these developed paper-based SERS substrates are utilized for the ultra-sensitive detection of the rhodamine 6G dye and thiram pesticides. Our theoretical studies reveal the creation of high density hotspots, with a huge localized and enhanced electromagnetic field, near the corners of the assembled structures, which justifies the ultrasensitive SERS signal in the fabricated paper-based SERS platform. This work provides an excellent paper-based SERS substrate for practical applications, and one which can also be beneficial to human health and environmental safety.

Chiral Au Nanorods: Synthesis, Chirality Origin, and Applications

“…The plasmonic modes on these three types of nanostructures generate the strongest electromagnetic field at their tips and interparticle regions because of the dipole resonance and dipole−dipole resonance within nanogaps, respectively. 76 In the complexes formed between chiral molecules and plasmonic metal nanomaterials, the angles between the effective electric dipoles and magnetic dipoles inside the molecules can be influenced by the adjacent SPR, as proposed by Govorov in the Figure 2a. 38 SPR can enhance the angle changes between electric and magnetic dipole moments, improving the CD intensity of chiral molecules.…”

“…The intensity and localization of electromagnetic field can be modulated by controlling their morphologies and conformations. The plasmonic modes on these three types of nanostructures generate the strongest electromagnetic field at their tips and interparticle regions because of the dipole resonance and dipole–dipole resonance within nanogaps, respectively …”

Synergistic effects of boron nitride sheets and reduced graphene oxide on reinforcing the thermal conduction, SERS performance and thermal property of polyimide composite films

“…into the matrix of polymer is an usual method to enhance SERS signals. [44][45][46][47] However, these metals are expensive, and plating metal on the surface of polymers is an inconvenient method. The potential use of two-dimensional materials as active substrates for SERS is increasingly being investigated.…”

“…Introducing common noble metallic nanoparticles (such as Au, Ag, and Cu, etc.) into the matrix of polymer is an usual method to enhance SERS signals 44–47 . However, these metals are expensive, and plating metal on the surface of polymers is an inconvenient method.…”

Colloidal nanomaterials for water quality improvement and monitoring

“…The lightweight and flexibility of membrane SERS substrates can also be combined with portable Raman spectrometers and smartphones, providing on-site detection ( Gao et al, 2016 ; Guo et al, 2019 ; Sun et al, 2021 ). Several filtering membranes have been used as SERS substrates, such as cellulose (paper) ( Lee et al, 2010 ; Moram et al, 2018 ; Wu et al, 2018 ; Jiao et al, 2022 ), polyamide (PA) ( Yu and White, 2012 ; Shi et al, 2014 ; Fateixa et al, 2018a ; Yu et al, 2021 ), PVDF ( Yu and White, 2012 ; Gao et al, 2016 ; Guo et al, 2019 ; Sun et al, 2021 ), and derived polymer-based composites ( Fateixa et al, 2018b ; Ankudze et al, 2019 ; Ye et al, 2020 ). Polymer-based membranes offer flexibility, porosity and extensive fibrillar networks for surface chemical functionalization, which are important features for substrates fabrication, but they are not SERS active themselves.…”