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http://hdl.handle.net/10397/106330
Title: | A highly sensitive polydopamine@hybrid carbon nanofillers based nanocomposite sensor for acquiring high-frequency ultrasonic waves | Authors: | Weng, Z Guan, R Zou, F Zhou, P Liao, Y Su, Z Huang, L Liu, F |
Issue Date: | Dec-2020 | Source: | Carbon, Dec. 2020, v. 170, p. 403-413 | Abstract: | Nanocomposite strain sensors have shown application prospect in a wide range of applications. However, the sensitivities of the existing nanocomposite strain sensors to high-frequency, microscope dynamic strains are rather unsatisfactory. Herein, we fabricate a highly sensitive nanocomposite sensor for acquiring micro-vibrations generated by ultrasonic waves, from polydopamine(PDA)-coated hybrid carbon nanofillers. First, multi-walled carbon nanotubes (MWCNTs) are coated by 10s nm thick viscous PDA to improve their compatibility with polyvinylidene fluoride substrates. Compared to uncoated MWCNTs, the use of 15 wt% PDA-coated MWCNTs leads to a 40% increase in sensitivity. Then, one-dimensional PDA@MWCNTs are mixed with two-dimensional single-layer graphene to enhance the geometric contact between nanofillers. The sensitivity of sensors with hybrid nanofillers far exceeds that of PDA@MWCNT sensors. Also, as the mass fraction of graphene within hybrid nanofillers expands from 33% to 66%, the sensitivity of the proposed sensor improves by approximately 120%, surpassing that of pure graphene sensors. The high sensitivity of the proposed sensor, which actually utilizes a lower graphene content, was shown to be derived from the synergy between the two types of nanofillers which are of different dimensionalities. This study presents a novel approach for optimizing the sensitivity of nanocomposite strain sensors to high-frequency micro-vibrations. | Keywords: | Condition monitoring Hybrid nanofiller Nanocomposite strain sensor Piezoresistive effect Polydopamine Tunneling effect Ultrasonic wave |
Publisher: | Elsevier Ltd | Journal: | Carbon | ISSN: | 0008-6223 | EISSN: | 1873-3891 | DOI: | 10.1016/j.carbon.2020.08.030 | Rights: | © 2020 Elsevier Ltd. All rights reserved. © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Weng, Z., Guan, R., Zou, F., Zhou, P., Liao, Y., Su, Z., ... & Liu, F. (2020). A highly sensitive polydopamine@ hybrid carbon nanofillers based nanocomposite sensor for acquiring high-frequency ultrasonic waves. Carbon, 170, 403-413 is available at https://doi.org/10.1016/j.carbon.2020.08.030. |
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Weng_Highly_Sensitive_Polydopamine.pdf | Pre-Published version | 2.07 MB | Adobe PDF | View/Open |
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