Detection of Ultra-Low Concentration of Methylene Blue by Porous Silicon Photonic Crystals Covered With Siver Nanoparticles as Efficient Sers Substrate

Vu, Chinh Duc; Nguyen, Thuy Van; Pham, Thanh Binh; Pham, Van Hoi; Bui, Huy; Vu, Thi Hong Hanh; Hai, Pham Viet

doi:10.15625/0868-3166/15927

Cited by 1 publication

(1 citation statement)

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“…This was achieved via spectroscopic techniques that included the conventional UV/Vis absorption as well as the surface enhanced Raman scattering (SERS) technique. The latter has previously been introduced as an advanced analytical tool for the quantification of molecules at very low detection limits with structural specificity, and has been reported to be able to detect even single or very few molecules [38]. An additional task of the study, related to the case of dyeing with a ternary combination, is to identify any potential selectivity of dyes binding onto the modified fabrics.…”

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of the Dyeing Process for Pristine and Modified Cotton Fabrics towards the Reduction of the Environmental Fingerprint

et al. 2023

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Though an important and chronic source of dyes released to the environment, the determination of the release of dyes that occurs during household or industrial washing is usually disregarded. The main scope of this study is to reveal the extent of dye release through washing, and to understand if the modification of cotton fabrics with cationic polymers could reduce it. Modified cotton fabrics, dyed with Acid Blue 281 (AB) or by a mixture of the reactive dyes Novacron Yellow S-3R (NY), Novacron Ruby S-3B (NR) and Novacron Dark Blue S-GL (NDB), underwent a certified washing process. The dyed fabrics were analyzed colorimetrically, while the washing waters were analyzed spectroscopically, via UV/Vis absorption and surface enhanced Raman scattering (SERS). In the modified fabrics dyed with the acid dye, an increased dye uptake was noticed that exhibited a color intensity of K/S~16, compared to K/S~0.45 of the unmodified fabrics. The corresponding normalized dye release (dye concentration/color intensity factor) in the wash water was ~1.6 for the modified fabrics, compared to ~6.5 in the case of the unmodified fabrics, indicating the significance of cotton modification on both the dye uptake and dye release during washing. In the fabrics dyed with a mixture of selected reactive dyes, the color uptake of modified (K/S~10) was also increased compared with unmodified fabrics (K/S~4.5). An important observation, is that in the case of the dyeing of the reactive dyes mixture, a selectivity on the part of the dye uptake was noticed, since the contribution of NY (yellow) is higher compared to that of the blue (positive value of color indicator coordinate (b)); however, this also resulted in an increased NY dye release during washing. The findings of this study could contribute to the dye release problem control due to fabric washing, and to the understanding of any potential selectivity on the part of dye–cotton interactions.

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Section: Introductionmentioning

confidence: 99%