Hydrophobic metal organic framework for enhancing performance of acoustic wave formaldehyde sensor based on polyethyleneimine and bacterial cellulose nanofilms

Wang, J.L., Shang, Jihua, Guo, Yuanjun, Jiang, Y.Y., Xiong, W.K., Li, J.S., Yang, X., Torun, Hamdi, Fu, Richard and Zu, Xiaotao (2021) Hydrophobic metal organic framework for enhancing performance of acoustic wave formaldehyde sensor based on polyethyleneimine and bacterial cellulose nanofilms. Journal of Materials Science: Materials in Electronics, 32 (14). pp. 18551-18564. ISSN 0957-4522

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Official URL: https://doi.org/10.1007/s10854-021-06241-6


A surface acoustic wave (SAW) formaldehyde gas sensor was fabricated on a 42°75' ST-cut quartz substrate, with a composite sensing layer of zeolitic imidazolate framework (ZIF)-8 on polyethyleneimine (PEI)/ bacterial cellulose (BC) nanofilms. The addition of snowflake-like ZIF-8 structure on the PEI/BC sensitive film significantly improves the hydrophobicity of the SAW sensor and increases its sensitivity to formaldehyde gas. It also significantly increases surface roughness of the sensitive film. The hydrophobic nature of ZIF-8 prevents water molecules from entering into the internal pores of the BC film, thereby avoiding a significant mass loading caused by humidity when the sensor is used to detect low-concentration formaldehyde gas. The Zn2+ sites at the surface of ZIF-8 improves the sensor's response to formaldehyde gas through enhanced physical adsorptions of gas molecules. Experimental results show that the ZIF-8@PEI/BC SAW sensor has a response (e.g., frequency shift) of 40.3 kHz to 10 ppm formaldehyde gas at 25℃ and 30% relative humidity (RH). When the relative humidity is increased from 30% to 93%, the response of the sensor only varies ~5%, and the change in response is negligible at medium humidity levels (~50 to 60% RH).

Item Type: Article
Additional Information: Funding information: This study was supported financially by the Fundamental Research Funds for the Central Universities (No. A03018023801119), the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. U1930205), Engineering Physics and Science Research Council of UK (EPSRC EP/P018998/1) and UK Fluidic Network (EP/N032861/1) -Special Interest Group of Acoustofluidics, and International Exchange Grant (IEC/NSFC/201078) through Royal Society and NFSC, and Royal Academy of Engineering: Research Exchange between UK and China.
Uncontrolled Keywords: Hydrophobicity, Formaldehyde gas sensor, Zeolitic imidazolate framework-8 (ZIF-8), Polyethyleneimine (PEI), Bacterial cellulose (BC)
Subjects: F200 Materials Science
G900 Others in Mathematical and Computing Sciences
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 21 May 2021 11:08
Last Modified: 07 Jul 2022 03:31
URI: http://nrl.northumbria.ac.uk/id/eprint/46241

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