Ag@ZIF-67 decorated cotton fabric as flexible, stable and sensitive SERS substrate for label-free detection of phenol-soluble modulin

Abstract

Although strategies of compositing noble materials and Zeolitic imidazolate frameworks (ZIFs) have been used to enhance the performance of ZIF-based surface-enhanced Raman scattering (SERS) substrates, the enhancement process still remains unclear and the sampling process with powder-form substrates is challenging for practical applications. In this study, a exible SERS substrate with silver (Ag) nanoparticle decorated ZIF-67 as the active materials and cotton fabric as the supporting framework is developed with a facile method in two steps. The proposed exible SERS substrate not only can reduce di culties during the sampling process, but also expands future applications for sampling towards irregular target substances. Meanwhile, the enhancement mechanism has been investigated by using Methylene Blue (MB) to probe the molecular interactions. The constructed SERS substrate shows the highest enhancement factor of 6.25×10 6 and an excellent detection sensitivity with a limitation of detection (LoD) of 10 − 14 M/L. Because of its excellent performance in SERS tracing, the proposed SERS substrate shows exceptional ability in detecting and identifying phenol-soluble modulins and is considered to be a label-free approach that requires no adding markers/tags or antibodies. The proposed substrate expands the potential applications of SERS technology for rapid detection of bacterial toxins during clinical diagnoses and treatment.

Hybrid electrodes composed of graphitic carbon nitride and zeolitic imidazolate framework‐67 for supercapacitor applications

“…In Figure 3A, the peaks seen around 474, 544, 591, 707, 751, 761, 980, 1051, 1152, 1212, 1234, and 1308 cm −1 are the characteristic Raman peaks of g‐C 3 N 4 proclaims the successful exfoliation of g‐C 3 N 4 43–45 . In Figure 3B (red line), the characteristic Raman peaks of ZIF‐67 can be seen obviously 46,47 . It can be syllogized from Figure 3B (blue line) that the peaks belonging to ZIF‐67 are dominant owing to the composition.…”

“…[43][44][45] In Figure 3B (red line), the characteristic Raman peaks of ZIF-67 can be seen obviously. 46,47 It can be syllogized from Figure 3B (blue line) that the peaks belonging to ZIF-67 are dominant owing to the composition.…”

Enhancing High-Temperature Energy Storage Performance of PEI-Based Dielectrics by Incorporating ZIF-67 with a Narrow Bandgap

“…23 Addition of small amounts of MOFs into the polymer matrix reduces the conductivity loss and improves the U e and η values of polymer dielectrics at high temperatures. 24 Dimethylimidazolium cobalt (ZIF-67), a type of MOF, exhibits excellent thermal and chemical stability 25 and a narrow bandgap (E g = 1.6 eV) 26 similar to that of semiconductors. The narrow E g endows ZIF-67 with exceptional electron affinity (χ F = 5.12 eV) 26 (the detailed analysis is provided in Figure S1).…”

“…24 Dimethylimidazolium cobalt (ZIF-67), a type of MOF, exhibits excellent thermal and chemical stability 25 and a narrow bandgap (E g = 1.6 eV) 26 similar to that of semiconductors. The narrow E g endows ZIF-67 with exceptional electron affinity (χ F = 5.12 eV) 26 (the detailed analysis is provided in Figure S1). Furthermore, the organic ligands of 2-methylimidazole (2-MiM) in ZIF-67 degrade at high temperatures.…”

Recent Developments in Plasmonic Sensors of Phenol and Its Derivatives

“…Specific studies on the development of several novel nanomaterials have been reported to assist effective Raman platforms including nanogold film-based Raman detection of rhodamine 6G and p-nitrophenol [28], Raman detection of multiple analytes based on Ag nanoparticle-modified SiO 2 nanofibrous [29], Ag nanostructure-assisted Raman sensing for monofluoroacetic acid [30], Ag nanoparticle-introduced Raman detection of carbofuran [31], on-site Raman detection of 1,2,3-benzotriazole on colloidal lignin particles [32], Ag-capped silicon nanopillar-based Raman detection of ochratoxin A [33], nano-shell composite array-based Raman sensor for antioxidant [34], and bimetallic plasmonic nanoparticle-assisted Raman detection of hazardous contamination [35]. Moreover, a series of scientific reports on several special metal-organic framework (MOF) structures has been investigated, leading to successful fabrication of novel Raman substrates applied in trace detection of phenol red [36], phenol-soluble modulin [37], and engine oil [38].…”