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Article

High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating

1
School of Optoelectronic Engineering and Instrument Science, Dalian University of Technology, Dalian 116024, China
2
School of Physics, Dalian University of Technology, Dalian 116024, China
*
Author to whom correspondence should be addressed.
Academic Editors: Noel Rodriguez and Ana M. Benito
Nanomaterials 2021, 11(5), 1134; https://doi.org/10.3390/nano11051134
Received: 22 February 2021 / Revised: 14 April 2021 / Accepted: 23 April 2021 / Published: 27 April 2021
(This article belongs to the Special Issue Functional Nanomaterials for Sensor Applications)
A high performance humidity sensor using tilted fiber Bragg grating (TFBG) and functional graphene oxide (GO)/multi-walled carbon nanotubes (MWCNTs) hybrid nano-materials was proposed. The humidity-sensitive material with three-dimensional (3D) structure was synthesized by the MWCNTs and GOs. Comparing with traditional two dimensional (2D) GOs film, water molecules could be absorbed effectively due to the larger ripples and more holes in GO/MWCNTs layers. The water molecule will fill the entire space in the 3D structure instead of air, which further enhances the absorption efficiency of the hybrid nanomaterial. TFBG as a compact and robust surrounding complex dielectric constant sensing platform was utilized. The mode coupling coefficient or the amplitude of TFBG cladding mode will vary sharply with the imaginary part of permittivity of the hybrid nanomaterial, realizing the high performance RH sensing. In the experiments, we successfully demonstrated that this 3D structural nanomaterial composed by the MWCNTs and GOs has significant advantages for expanding the range of humidity detection (range from 30% to 90%) and enhancing the detection sensitivity (0.377 dB/% RH is twice more than humidity sensor with 2D GO film). The TFBG-based RH sensor also exhibits good repeatability and stability. Our proposed humidity sensor has potential application in environmental and healthy monitoring fields. View Full-Text
Keywords: fiber Bragg grating; graphene oxide; humidity detection; multi-walled carbon nanotubes fiber Bragg grating; graphene oxide; humidity detection; multi-walled carbon nanotubes
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MDPI and ACS Style

Wang, F.; Wang, B.; Zhang, X.; Lu, M.; Zhang, Y.; Sun, C.; Peng, W. High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating. Nanomaterials 2021, 11, 1134. https://doi.org/10.3390/nano11051134

AMA Style

Wang F, Wang B, Zhang X, Lu M, Zhang Y, Sun C, Peng W. High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating. Nanomaterials. 2021; 11(5):1134. https://doi.org/10.3390/nano11051134

Chicago/Turabian Style

Wang, Fang, Bowen Wang, Xuhui Zhang, Mengdi Lu, Yang Zhang, Changsen Sun, and Wei Peng. 2021. "High Sensitivity Humidity Detection Based on Functional GO/MWCNTs Hybrid Nano-Materials Coated Titled Fiber Bragg Grating" Nanomaterials 11, no. 5: 1134. https://doi.org/10.3390/nano11051134

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