Ag-Coated Cellulose Fibers as Surface-Enhanced Raman Scattering Substrates for Adsorptive Detection of Malachite Green

Abstract

Surface-enhanced Raman scattering (SERS) is a sensitive technique for the detection of low concentration analytes. In this study, we used cellulose fibers (CF) as the templates for the loading of silver nanoparticles (Ag NPs), and the obtained CF-Ag was applied in the detection of R6G and Malachite Green (MG) by surface-enhanced Raman scattering. The adsorption technique was employed in the sample preparation, and the optimal detecting status was identified in the dynamic range (sample status ranging from wet to dry) for different concentration of analytes. In comparison to Ag NPs, CF-Ag showed enhanced performance for adsorptive detection of Malachite Green, and the limit of detection was 5 × 10−12 M.

Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

“…The nanospheres, highly symmetrical particles, are the most studied because of their monodispersity and synthetic reproducibility, that assure the repeatability of experiments and results. Spherical AgNPs and their composites have a widely application range, mostly in biotechnology and sensors [79][80][81]85,95,96]. The AgNPs show a typical localized surface plasmon resonance (LSPR) whereby the electrons on the AgNPs surface interact with electromagnetic radiation, generating LSPR and producing extinction and scattering spectra, with absorption bands in the 370-470 nm range.…”

“…On the other hand, the void area has been used to tune the refractive index, increase the active region for catalysis, and advance the ability to tolerate cyclic volume modifications. The morphology plays a key role, especially for the possibility of having materials with different symmetries (spheres, AgNPs, cubes AgNCs) [79][80][81][82][83][84][85][86][87] or without defined and reproducible symmetry (stars, AgNSs, flower, AgNFs, wires, AgNWs) [69,[88][89][90][91][92][93][94]. TEM images of silver nanoparticles of different geometries and shape are presented in Figure 4.…”

Fabrication process and characterization of AgNPs/PVA/cellulose as a SERS platform for in-situ detection of residual pesticides in fruit

“…However, the instability of the existing silver based substrates, leading to the requirement of strict conditions for preservation, has been the main issue limiting the utility of SERS in practice. Several stabilizers have been investigated, such as poly(N-vinylpyrrolidone) (PVP), carboxylic acid, sodium citrate, nano cellulose, starch, and protein [5][6][7][8][9]. The use of stabilizers, while improving the stability, also interfere with the scattering signals, which is extremely undesirable especially in quantitative analysis.…”

Silver-Nanocellulose Composite Used as SERS Substrate for Detecting Carbendazim

“…As the Ag branches increasingly developed blooms, the SERS hotspot increased; however, some analytes adsorbed under the branch and remained undetected by the laser. These branches were unable to contribute to the SERS intensity as in our previous work [29]. When the Ag ion concentration reached 8 mM, the compactness of Ag branches intensified.…”

“…Francis et al [28] used hydroxypropyl cellulose as a template to synthesize Ag NPs and demonstrated that Ag + readily combines with O − in the R-OH or ROOH groups of cellulose, which provide us with attachment sites. In our previous work [29], we used cellulose to adsorb the Ag + and used the reducibility itself to form Ag seeds and shaped Ag-coated cellulose fibers in the presence of the hydroxylamine hydrochloride. Limei Tian et al thought that the bacterial nanocellulose (BNC) film base could obtain significantly lower surface roughness than conventional filter paper consisting of normal cellulose, so they made the BNC film and fabricated and loaded Au nanoparticles by a gravity­assisted filtration method as a SERS substrate [30].…”