Assembly of metal nanoparticles on regenerated fibers from wood sawdust and de-inked pulp: flexible substrates for surface enhanced Raman scattering (SERS) applications

Abstract

We report on simple and low-cost active SERS substrates made using regenerated fibers from wood products. Glycidyltrimethylammonium chloride (GTAC) was used to graft ammonium groups on the fibers' surfaces under strong alkaline conditions. After GTAC treatment, citrate-stabilized nanoparticles were assembled via electrostatic interaction. X-ray diffraction, Scanning electron microscopy images and optical photographs indicated that the surfaces of the fibers were conformally coated with metal nanoparticles. We also observed that after being cationized, the fibers experienced significant swelling and shrinking under dry and wet conditions. Rhodamine 6G was used as probe molecule to test the SERS performance of the substrates-concentrations as low as 10 -9 M were detected. Furthermore, the modified fibers were used to detect melamine, illustrating their potential as viable substrates for applications such as markers for the quality and shelf-life of food products and detection of toxins.

Plasmonic nanoparticles‐decorated diatomite biosilica: extending the horizon of on‐chip chromatography and label‐free biosensing

“…Figure a shows the SERS spectra of the pure substances. Specifically: pyrene, the peak at 590 cm −1 is assigned to the skeletal stretching vibration and 1230 cm −1 is associated with the C–C stretching/C–H in‐plane bending of pyrene ; MBA, the peaks located at 1074 and 1587 cm −1 are associated with C−C ring‐breathing modes of MBA ; R6G, the peak at 607 cm −1 is associated with C−C‐C ring in plane vibrations, while the peaks at 1360 and 1508 cm −1 are associated with aromatic C−C stretching vibrations of R6G ; NB, the peak at 594 cm −1 is assigned to the in‐plane deformation vibration of the NB. The peaks labeled with asterisks are used to represent the substances respectively.…”

Ultra-sensitive lab-on-a-chip detection of Sudan I in food using plasmonics-enhanced diatomaceous thin film

“…R6G is the most commonly used Raman probe molecule because of its affinity with metallic surfaces and intense Raman signals. The peak at 1308 cm −1 is assigned to C-O-C stretching vibrations of R6G, while the peaks at 1194, 1360 and 1508 cm −1 are associated with aromatic C-C stretching vibrations of R6G (X.-M. Kong, et al, 2015). For Sudan I, the peak at 1160 cm −1 is assigned to the vibration of benzene ring with double benzene nucleus, and the peak at 1577 cm −1 is assigned to the vibration of azo and double benzene nucleus.…”

Antibacterial fibers impregnated with mycosynthetized AgNPs for control of Pectobacterium carotovorum

“…Cotton fibers were modified with AgNP using two methodologies; prior cationization of the fiber to obtain the “A-AgNPs-C″ material [ 31 , 32 ], and in situ biochemical reduction of silver to get the “A-AgNPs-IBR” material [ 33 ]. The first, A-AgNPs-C, were made by soaking 5 g of cotton fibers in 10 mL of Milli Q water, to later immerse them in a solution composed of 10 mL of 10 % NaOH and 5 mL of 75 % glycidyl trimethylammonium chloride (GTAC) solution for 15 min under agitation at 150 rpm.…”