Regular Article Piezoelectric b-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains ★ Nabil Chakhchaoui 1,2,* , Rida Farhan 3 , Meriem Boutaldat 2,3 , Marwane Rouway 2,4 , Adil Eddiai 3 , Mounir Meddad 5 , Abdelowahed Hajjaji 6 , Omar Cherkaoui 2 , Yahia Boughaleb 1 , and L.Van Langenhove 7 1 BGIM Laboratory, Higher Normal School (ENS), Hassan II University, Casablanca, Morocco 2 REMTEX Laboratory, Higher School of Textile and Clothing Industries (ESITH), Casablanca, Morocco 3 Laboratory of Physics of Condensed Matter (LPMC), Faculty of Sciences Ben M’Sik Hassan II University, Casablanca, Morocco 4 Hassan II University, Faculty of Sciences Aïn Chock, Laboratory of Renewable Energy and Dynamic Systems, BP 5366 Maarif, 20100 Casablanca, Morocco 5 LAS Laboratory of Setif, Mohamed el Bachir el Ibrahimi BBA University, Setif, Algeria 6 Laboratory of Engineer Science for Energy, ENSA, Chouaïb Doukkali University, El Jadida, Morocco 7 Center for Textile Science and Engineering, Department of Materials, Textiles and Chemical Engineering, Ghent University, Ghent, Belgium Received: 31 May 2020 / Received in final form: 5 July 2020 / Accepted: 17 July 2020 Abstract. Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive b-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF)  carbon nanofillers (CNF)  tetraethyl orthosilicate (TEOS), Si(OCH 2 CH 3 ) 4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric b-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric b-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase a introduced in the unloaded PVDF, to the b-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric b-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications. 1 Introduction Composite, the flexible materials mostly consisting of interconnected natural or artificial particles [1], have evolved with us for at least 70 000 [2–4]. Textiles are omnipresent in our life and envelop our skin and its surroundings. They not only provide a protective shield, but they also have aesthetic appeal and cultural signifi- cance. Recent technologies have extended the traditional functionality of textiles. Advances in materials science have added intelligence to textiles and created smart clothes. The introduction of intelligent materials into textile structures offers an opportunity to develop textiles with new functionalities; such as detection, reaction and conduct of electricity, the textile will be able to perform energy conversion operations [5,6]. Particular attention in this work is devoted to describing the materials and the methodology to develop smart electroactive textiles. Moreover, smart textiles are defined as textile products, such as fibers and filaments, yarns together with woven, ★ Contribution to the Topical Issue “Advanced Materials for Energy Harvesting, Storage, Sensing and Environmental Engi- neering (ICOME 2019)”, edited by Mohammed El Ganaoui, Mohamed El Jouad, Rachid Bennacer, Jean-Michel Nunzi. * e-mail: chakhchaoui.nabil@gmail.com Eur. Phys. J. Appl. Phys. 91, 31301 (2020) © EDP Sciences, 2020 https://doi.org/10.1051/epjap/2020200158 THE EUROPEAN PHYSICAL JOURNAL APPLIED PHYSICS 31301-p1