Sensitive and reproducible gold nanostar@metal–organic framework-based SERS membranes for the online monitoring of the freshness of shrimps

Abstract

Given the prevalence of food safety, it is essential to on-line monitor the food quality. Surface-enhanced Raman scattering (SERS) has very high sensitivity and molecular fingerprinting capabilities in analytical fields,...

Dual-Mode Separation and SERS Detection of Carbaryl with PA-6/AuNRs@ZIF-8 Films

“…Moreover, the ZIF-8 shell structure provides chemical enhancement that allows further amplification of the Raman signal. 35,36 In a word, the PA-6/AuNRs@ZIF-8 substrate can amplify the SERS signal significantly through the synergistic effect of the core AuNRs and the ZIF-8 shell structure. The enhancement factor (EF) of the PA-6/AuNRs@ZIF-8 film is 2.3 × 10 6 .…”

“…The p -ATP Raman signature peaks can be found on the PA-6/AuNRs substrate clearly shown in Figure B­(b), most can be attributed to the electromagnetic mechanism (EM) and vast hot spots between AuNRs (Figure B­(c)). − Further on, with the encapsulation of ZIF-8 on the AuNRs, further improved p -ATP signals can be observed in Figure B­(a), confirming the further enhanced Raman intensity through adsorption of ZIF-8 to small molecules. Moreover, the ZIF-8 shell structure provides chemical enhancement that allows further amplification of the Raman signal. , In a word, the PA-6/AuNRs@ZIF-8 substrate can amplify the SERS signal significantly through the synergistic effect of the core AuNRs and the ZIF-8 shell structure. The enhancement factor (EF) of the PA-6/AuNRs@ZIF-8 film is 2.3 × 10 6 .…”

Design, Fabrication, and Applications of SERS Substrates for Food Safety Detection: Review

“…For instance, after Kneipp first used colloidal silver nanoparticle solution to detect a single R6G molecule in 1997 [ 101 ], subsequent studies have demonstrated the achievement of single-molecule detection using nanometal colloids. As a result, ongoing efforts focus on the development of metal nanoparticles, including different shapes of MNPs [ 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 ], composite materials of MNPs [ 111 , 112 , 113 , 114 , 115 ], and the modified MNPs [ 116 , 117 , 118 ].…”

“…Currently, various shapes of metal MNPs have been proposed, including the nanorods [ 111 , 116 ], nanostars [ 109 ], nanocubes [ 110 ], hyperbranched Au nanocorals [ 102 ], flower-like Au NPs [ 103 ], Pt-Au triangular nanoprisms [ 104 ], Au popcorns [ 105 ], decahedral Ag NPs [ 106 ], Au nanofoams [ 107 ], and dual-gap Au nanodumbbells [ 108 ]. These different shapes are aimed at creating more branches, pores, or tips on the MNPs, which are believed to generate high-intensity electromagnetic regions, also known as anisotropic hot spots.…”

Differences between surfactant-free Au@Ag and CTAB-stabilized Au@Ag star-like nanoparticles in the preparation of nanoarrays to improve their surface-enhanced Raman scattering (SERS) performance

“…8 The SERS signal enhancement strongly depends on the interaction between the induced light and substrate carrying the analyte. 9–11 Based on the electromagnetic enhancement mechanism, 12 SERS signal amplification relies on the intersection of plasmonic nanoparticles, which creates a strong near-field coupling effect called “hot spots”. 13 The “hot spots” are the positions where the localized electromagnetic field can be highly improved, and the Raman signal can be significantly amplified when the analytes reaches these positions.…”