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

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A Sensitive “Optical Nose” for Detection of Volatile Organic Molecules Based on Au@MOFs Nanoparticle Arrays through Surface‐Enhanced Raman Scattering
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-03-03 , DOI: 10.1002/ppsc.201900452
Dandan Men ₁ , Sujuan Feng ₂ , Guangqiang Liu ₂ , Lifeng Hang ₃ , Tao Zhang ₃

Affiliation

Surface‐enhanced Raman scattering (SERS) is an effective technique for detecting toxic gas and volatile organic molecules (VOMs); however, recent SERS‐based gas sensors have disadvantages and lack an effective approach to capture toxic gas and insufficient reproducibility of SERS substrates. Herein, a facile strategy is developed to integrate metal‐organic frameworks with Au nanoparticle (NP) arrays to form Au@ZIF‐8 NP arrays, which can be used as an “optical nose” based on SERS to detect toxic VOMs with good reproducibility and sensitivity. Toluene as a target molecule is recognized at ppm levels by the Au@ZIF‐8 NP arrays in situ. And the analytical enhancement factor of Au@ZIF‐8 NP arrays for toluene is about 1.2 × 10⁵. Importantly, this SERS substrate can also detect the 1‐butanol molecule, which provides an idea for designing a universal VOM sensor. In addition, the coating method of the ZIF‐8 shell can be extended to synthetize various NPs@ZIF‐8 core–shell composites, such as Au nanospheres@ZIF‐8, Au@Ag nanorods@ZIF‐8, PS microspheres@ZIF‐8, and Fe₂O₃ microellipsoids@ZIF‐8 composites.

中文翻译：

基于Au @ MOFs纳米粒子阵列的表面增强拉曼散射检测灵敏的“光学鼻”，用于检测挥发性有机分子

表面增强拉曼散射（SERS）是检测有毒气体和挥发性有机分子（VOM）的有效技术。但是，最近基于SERS的气体传感器具有缺点，并且缺乏有效的方法来捕获有毒气体，并且SERS基质的再现性不足。本文提出了一种简便的策略，将金属有机框架与金纳米颗粒（NP）阵列集成以形成Au @ ZIF-8 NP阵列，该阵列可以用作基于SERS的“光学鼻”，以良好的可重复性检测有毒VOM和敏感性。Au @ ZIF-8 NP阵列可以原位识别ppm级的甲苯作为目标分子。Au @ ZIF-8 NP阵列对甲苯的分析增强因子约为1.2×10 ⁵。重要的是，这种SERS底物还可以检测1-丁醇分子，这为设计通用VOM传感器提供了一个思路。此外，可以扩展ZIF-8外壳的涂覆方法，以合成各种NPs @ ZIF-8核-壳复合材料，例如Au纳米球@ ZIF-8，Au @ Ag纳米棒@ ZIF-8，PS微球@ZIF ‐8和Fe ₂ O ₃微椭球体@ ZIF-8复合材料。

更新日期：2020-03-03

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