Ag@SiO2 nanocube loaded miniaturized filter paper as a hybrid flexible plasmonic SERS substrate for trace melamine detection. Issue 48 (1st December 2017)

• Record Type: Journal Article
• Authors: Mekonnen, Menbere Leul; Su, Wei-Nien; Chen, Ching-Hsiang; Hwang, Bing-Joe
• Is Part Of: Analytical methods. Volume 9:Issue 48(2017)
• Page Start: 6823
• Page End: 6829
• Publication Date: 2017-12-01
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c7ay02192e
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : An inexpensive flexible plasmonic substrate exploiting the intrinsic properties of paper and anisotropic Ag@SiO2 nanocubes with improved SERS activity is demonstrated. Abstract : A robust flexible paper-plasmonic hybrid SERS substrate is reported by exploiting the intrinsic properties of filter paper and anisotropic Ag@SiO2 nanocubes. The fibrous structure of paper promotes the assemblage of sharp-edged nanostructures which significantly improved the SERS activity. An inexpensive sensing platform with reasonable distribution and interparticle spacing of nanocubes was obtained by filtering Ag@SiO2 through a miniaturized filter paper. The thin silica shell improved the stability and interparticle spacing of silver nanocubes in the sensing platform, rendering enhanced SERS activity through the plasmon-coupling effect as compared to a conventional rigid substrate. Assessment of the analytical performance of the substrate for melamine quantification showed a good linearity ( R 2 = 0.9948) up to 1 mg L −1 with a limit of detection of 0.06 mg L −1 . The detection limit in liquid milk was down to 0.17 mg L −1, which is below the permissible residue limit signifying adequate sensitivity for real sample analysis with less sample treatment.