Plasmonic MOF Thin Films with Raman Internal Standard for Fast and Ultrasensitive SERS Detection of Chemical Warfare Agents in Ambient Air

Abstract

Surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique for selective detection and quantification of molecules at extremely low concentrations. However, practical SERS applications for gaseous chemicals with small cross section is still in its early stages. We herein report a plasmonic-sorbent thin-film platform with integrated Raman internal standard with outstanding SERS sensing capabilities for chemical warfare agents (CWA) simulants. The thin film is constituted of close-packed core−shell Au@Ag nanorods individually encapsulated within a ZIF-8

In situ encapsulation of ZrQ in UiO‐66 (Zr‐BDC) for pore size control to enhance detection of a nerve agent simulant dimethyl methyl phosphonate

“…The irreversibility of fluorescence quenching in the ZrQ@Zr-BDC suggests that static quenching is occurring in the nanocomposite. Capacitive micromachined ultrasonic transducer 56 [60] UiO-66-NH 2 coated electrodes 3 [61] UiO-66 film on Parylene-patterned resonant microcantilever 5 [53] Au@Ag@ZIF-8 2500 [62] ZrQ@Zr-BDC 1.04 This work…”

SERS Tags for Biomedical Detection and Bioimaging

“…When employing MOFs to encapsulate plasmonic nanoparticles, the packaged structures show enhanced stability and sensitivity. Plasmonic nanoparticles with different shapes could be encapsulated by zeolitic imidazolate framework-8 (ZIF-8) 72 , 73 . By meticulous designation of a thick ZIF-8 shell on the surface of AuNRs, Lafuente et al fabricated a quantitative and sensitive SERS platform 73 .…”

“…Plasmonic nanoparticles with different shapes could be encapsulated by zeolitic imidazolate framework-8 (ZIF-8) 72 , 73 . By meticulous designation of a thick ZIF-8 shell on the surface of AuNRs, Lafuente et al fabricated a quantitative and sensitive SERS platform 73 . The MOF shells assumed the role of filtration to prevent interferences from closing to the surface of AuNRs, strengthening the identification capability of the sensors.…”

Au@ZrO2 core‐shell nanoparticles as a surface‐enhanced Raman scattering substrate for organophosphorus compounds detection

“…[ 20 ] In addition, due to the complexity of the environment, the substrate lacking specificity is susceptible to interference. [ 21 ] Consequently, it is self‐evidently important to develop a specific substrate to further improve the effective monitoring of OPs compounds.…”