Plasmonic nose: integrating the MOF-enabled molecular preconcentration effect with a plasmonic array for recognition of molecular-level volatile organic compounds

Abstract

Timely detection of toxic vapor is vital for safeguarding people's lives. Herein, we design a plasmonic nose based on a zeolitic imidazolate framework (ZIF)-encapsulated Ag nanocube array for ultratrace recognition of VOC vapor. The plasmonic nose enables in situ adsorption kinetics and recognition of various VOCs at ppm levels, eliminating false positives. Our approach provides a paradigm shift to next-generation, effective and specific gas sensors.

Understanding the Role of Metal–Organic Frameworks in Surface‐Enhanced Raman Scattering Application

“…Ling and co‐workers also designed and synthesized a plasmonic nose based on a ZIF‐8‐encapsulated Ag nanocube platform (Figure 5E). [ 28 ] The MOFs layer plays a critical role in enabling in situ kinetics investigations which should be attributed to their excellent sensitivity and responsiveness toward gas detection compared to their absence. Via modulating ZIF‐8 thickness and interparticle spacing of Ag nanocubes, both ZIF‐8's preconcentration effect for gas accumulation and 3D spatial electromagnetic field enhancement are maximized (Figure 5F).…”

“…MOF‐based SERS substrates have been successfully used to detect pesticide residues, [ 58 ] illegal additives, [ 29 ] and environmental pollutants. [ 28 ] Cao et al. used a simple solution impregnation method to synthesize three types of AuNP/MOF materials for the detection of pesticide‐acetamiprid in aqueous solution (detection limit up to 0.009 × 10 −6 m ).…”

“…Ling and co‐workers developed an Ag@ZIF‐8 plasma array gas detector pair to ultratrace recognition of VOCs vapor in industrial pollution. [ 28 ] The plasmonic nose enabled in situ adsorption kinetics and recognition of various VOCs at ppm levels. In addition to detecting the atmospheric environment, SERS based on MOFs is also very sensitive to the detection of pollutants in the water environment.…”

Recent advances in surface-enhanced Raman spectroscopy for the detection of tumor markers

“…Koh等人 [78] 设计了一种"等离子体鼻"结构, 其由MOF 包覆的Ag纳米立方体(Ag@ZIF)组成, 以将气体分子 和电磁场集中在该结构三维空间的纳米尺度上, 检测 低至ppm(parts per million)级的VOCs. Yang等人 [79] 提 出了一种新型阵列辅助SERS微流控芯片(ArraySERS 芯片), 用于气体传感分析, 三角形阵列结构可增加通 道中气体分子与传感界面之间的碰撞概率, 以提高检 图 4 (网络版彩色)SERS技术在气体类和其他类肿瘤标志物检测中的应用.…”

A Sensitive “Optical Nose” for Detection of Volatile Organic Molecules Based on Au@MOFs Nanoparticle Arrays through Surface‐Enhanced Raman Scattering

“…[ 26 ] Recently, Ling and co‐workers prepared Ag@MOFs SERS platform to concentrate gas molecules, achieving SERS detection of VOMs at ppm level. [ 27 ] However, the structural units of as‐prepared SERS based gas sensors were mainly random distribution and the thickness of MOF shell also affected the intensity of SERS signals, which lead relatively low average enhancement and poor reproducibility on a large scale of these SERS substrates. Therefore, developing a SERS based gas sensor with effective enrichment of gas, high average enhancement and good reproducibility is important.…”