Preparation method of formaldehyde SERS (Surface Enhanced Raman Scattering) sensor based on Au and ZIF-8 core-shell structure

By optimizing the design and assembly process of the Au@ZIF-8 core-shell structure, a multilayer nanoparticle thin film structure was prepared, which solved the problems of insufficient sensitivity and stability of formaldehyde detection in the existing technology, and realized ultrasensitive and specific detection of formaldehyde, which is suitable for rapid quantitative application in complex environments.

CN122084598APending Publication Date: 2026-05-26CHINA JILIANG UNIV
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Patent Information

Application Number
CN202610291985.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-11
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve high sensitivity, specificity, and stability in formaldehyde detection, especially in complex environments where the signal-to-noise ratio is poor. Traditional methods involve expensive equipment and cumbersome sample pretreatment. Furthermore, the poor stability of the Au@ZIF-8 core-shell MOF structure and the tendency of nanoparticles to aggregate lead to decreased detection sensitivity and repeatability.

Method used

By optimizing the design and assembly process of the Au@ZIF-8 core-shell structure, adjusting the size of AuNPs, the thickness of the ZIF-8 shell, and the number of film layers, a multilayer nanoparticle film structure was prepared. Combining the high specific surface area of ​​ZIF-8 and the electromagnetic enhancement effect of Au, ultrasensitive detection of formaldehyde gas was achieved.

Benefits of technology

It achieves ultrasensitive detection of formaldehyde with a detection limit as low as 0.16 ppt. It can specifically identify formaldehyde signals in complex environments, block interfering substances, has a high signal-to-noise ratio, and provides reliable detection results.

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Abstract

The invention discloses a preparation method and application of a formaldehyde SERS (Surface Enhanced Raman Scattering) sensor based on an Au and ZIF-8 core-shell nanostructure, and belongs to the technical field of gas detection. A formaldehyde intrinsic Raman cross section is extremely small, a common SERS substrate is weak in detection signal under low concentration due to lack of capture capability, the sensor adopts Au-coated ZIF-8 core-shell nanoparticles to assemble to form two layers of films as the SERS substrate, Au nanoparticles (AuNPs) are used as an electromagnetic enhancement core, a ZIF-8 shell layer realizes enrichment and screening of formaldehyde molecules, and the SERS substrate is used for detecting the formaldehyde molecules. A double-layer film structure is constructed through a layer-to-layer deposition method so as to obtain the optimal SERS performance. The problems that in an existing formaldehyde detection technology, sensitivity is low, specificity is poor, stability is insufficient, and on-site rapid detection is difficult are solved, the detection limit is as low as 0.16 ppt, in the wide range of 0.01 ppb to 100 ppm, the characteristic peak intensity and the formaldehyde concentration logarithm show an excellent linear relation (R2 is larger than or equal to 0.995), formaldehyde can be specifically recognized, interference of other VOCs can be excluded, and the method is suitable for being applied to the field of formaldehyde detection. The method is suitable for rapid quantitative detection of formaldehyde in actual scenes such as indoor environment and cigarette smoke.
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