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Open AccessArticle

Flexible Pressure Sensor Based on PVDF Nanocomposites Containing Reduced Graphene Oxide-Titania Hybrid Nanolayers

Materials Science & Technology Program (MATS), College of Arts & Sciences, Qatar University, Doha 2713, Qatar
Center for Advanced Materials, Qatar University, Doha 2713, Qatar
College of Polymer Science and Polymer Engineering, Akron Functional Materials Center (AFMC), The University of Akron, Akron, OH 44325, USA
Author to whom correspondence should be addressed.
Academic Editors: Jinlian Hu, Rui Xiao and Chih-Feng Huang
Polymers 2017, 9(2), 33;
Received: 7 November 2016 / Revised: 19 December 2016 / Accepted: 13 January 2017 / Published: 26 January 2017
(This article belongs to the Special Issue Functionally Responsive Polymeric Materials)
A novel flexible nanocomposite pressure sensor with a tensile strength of about 47 MPa is fabricated in this work. Nanolayers of titanium dioxide (titania nanolayers, TNL) synthesized by hydrothermal method are used to reinforce the polyvinylidene fluoride (PVDF) by simple solution mixing. A hybrid composite is prepared by incorporating the TNL (2.5 wt %) with reduced graphene oxide (rGO) (2.5 wt %) synthesized by improved graphene oxide synthesis to form a PVDF/rGO-TNL composite. A comparison between PVDF, PVDF/rGO (5 wt %), PVDF/TNL (5 wt %) and PVDF/rGO-TNL (total additives 5 wt %) samples are analyzed for their sensing, thermal and dielectric characteristics. The new shape of additives (with sharp morphology), good interaction and well distributed hybrid additives in the matrix increased the sensitivity by 333.46% at 5 kPa, 200.7% at 10.7 kPa and 246.7% at 17.6 kPa compared to the individual PVDF composite of TNL, confirming its possible application in fabricating low cost and light weight pressure sensing devices and electronic devices with reduced quantity of metal oxides. Increase in the β crystallinity percentage and removal of α phase for PVDF was detected for the hybrid composite and linked to the improvement in the mechanical properties. Tensile strength for the hybrid composite (46.91 MPa) was 115% higher than that of the neat polymer matrix. Improvement in the wettability and less roughness in the hybrid composites were observed, which can prevent fouling, a major disadvantage in many sensor applications. View Full-Text
Keywords: hybrid additives; nanocomposite; dielectric; relative resistance; synergy hybrid additives; nanocomposite; dielectric; relative resistance; synergy
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MDPI and ACS Style

Al-Saygh, A.; Ponnamma, D.; AlMaadeed, M.A.; Vijayan P, P.; Karim, A.; Hassan, M.K. Flexible Pressure Sensor Based on PVDF Nanocomposites Containing Reduced Graphene Oxide-Titania Hybrid Nanolayers. Polymers 2017, 9, 33.

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