AuNPs@MIL-101 (Cr) as a SERS-Active Substrate for Sensitive Detection of VOCs

Abstract

Surface-enhanced Raman scattering (SERS) is an important and powerful analytical technique in chemical and biochemical analyses. Metal–organic frameworks (MOFs) can effectively capture volatile organic compounds (VOCs) with high adsorption capacity and fast kinetics, and the local surface plasmon resonance characteristics of gold nanoparticles can quickly and effectively distinguish different VOCs by SERS. Combining both, we designed a novel SERS substrate based on embedding gold nanoparticles (AuNPs) within MIL-101(Cr) for the recognition of various VOCs in the gaseous phase. Occupying of AuNPs inside MIL-101(Cr) increased the micropore-specific surface area of AuNPs@MIL-101(Cr), which enabled AuNPs@MIL-101(Cr) to absorb more toluene molecules and consequently realized its high detection sensitivity. The detection limits for toluene, 4-ethylbenzaldehyde, and formaldehyde were down to 6, 5, and 75, ppm respectively. Moreover, this substrate could be used for detecting different VOCs simultaneously. Finally, we discussed the enhancement of AuNPs outside and inside MIL-101(Cr) on the Raman signal.

Metal–Organic Frameworks–Based Surface–Enhanced Raman Scattering Substrates for Gas Sensing

“…They possess a pore size, high surface area and remarkable stability, making them excellent for adso gases and other substances. To accomplish convenient and speedy optical detecti VOCs, Li et al [58] developed a SERS platform referred to as Au NPs@MIL−101 (C In various core-shell composite materials of NMNPs and MOFs developed throughout history, appropriate capping agents are generally added to prevent the aggregation of NMNPs. In spite of this, the stabilizing agents present around plasmonic Au nanoparticles not only hinder the active sites of plasmonic Au nanoparticles but also result in suboptimal electron transfer between MOFs and plasmonic Au nanoparticles.…”

High sensitive SERS film of Ag-coated aggregated nanowire structure and benzene gas detection

“…[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Porous macromolecules for the promotion of gas molecule adsorption also have been proposed. [30][31][32][33][34] Ultrahigh sensitive gas detections from ppb to ppt-level using bare nanostructured films also have been reported. [35][36][37][38][39][40] On the other hand, the temperature of SERS films is known to be a very important universal parameter which can control the gas adsorption behavior on the SERS films.…”

Enhancing the catalytic performance of MOF-polymer@AuNP-based nanozymes for colorimetric detection of serum l-cysteine

“…Currently, common methods 2–10 for the integration of AuNPs and MOFs are encapsulation, 2,4,5 in situ growth 3,6,8 and surface modification. 7,9,10 For example, MOF@AuNPs with a yolk–shell nanostructure were constructed via a sacrificial template strategy.…”

“…2 This, in turn, improves their responsiveness, operability, and reusability, broadening the application and research potential of MOF@AuNP composite catalysts in pharmaceutical and biological analyses. 3 Currently, common methods [2][3][4][5][6][7][8][9][10] for the integration of AuNPs and MOFs are encapsulation, 2,4,5 in situ growth 3,6,8 and surface modification. 7,9,10 For example, MOF@AuNPs with a yolk-shell nanostructure were constructed via a sacrificial template strategy.…”

“…3 Currently, common methods [2][3][4][5][6][7][8][9][10] for the integration of AuNPs and MOFs are encapsulation, 2,4,5 in situ growth 3,6,8 and surface modification. 7,9,10 For example, MOF@AuNPs with a yolk-shell nanostructure were constructed via a sacrificial template strategy. 2 After the sacrificial silica template was etched, AuNPs were encapsulated in the MOF shell and the resulting material was further used as a nanocatalyst for aerobic oxidation.…”