Synthesis of lead-free (Bi0,5Na0,5)TiO3 thin film by RF magnetron sputtering: Impact of Na on the properties of film

Hamieh, Ahmad; Ponchel, Freddy; Barrau, Sophie; Rémiens, Denis

doi:10.1080/00150193.2020.1713345

Cited by 8 publications

(8 citation statements)

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“…First, a bottom electrode of LaNiO 3 (LNO) (200 nm) was sputtered on the Si/SiO 2 substrate. Then, lead-free (Bi 0.5 Na 0.5 )TiO 3 (BNT) thin films (300 nm) were grown on Si/SiO 2 /LNO by RF magnetron sputtering following a procedure described previously . BNT was crystallized in a perovskite structure with a (100) orientation enhanced by the structure matching between BNT and LNO; no second phase was observed.…”

Section: Methodsmentioning

confidence: 99%

“…Then, lead-free (Bi 0.5 Na 0.5 )TiO 3 (BNT) thin films (300 nm) were grown on Si/SiO 2 /LNO by RF magnetron sputtering following a procedure described previously. 45 BNT was crystallized in a perovskite structure with a (100) orientation enhanced by the structure matching between BNT and LNO; no second phase was observed. The obtained multilayer Si/SiO 2 /LNO/BNT is named BNT in the present study.…”

Section: Syntheses and Preparation Of The Bilayer Composite Synthesis...mentioning

confidence: 99%

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Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Bouad

Fadel

Mohan

et al. 2022

ACS Appl. Polym. Mater.

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An approach based on the use of a macromolecular coupling agent and the aim to improve the interfacial adhesion between piezoelectric ceramics and piezoelectric polymer matrix in piezoelectric composites is presented. Poly(methyl methacrylate) (PMMA) bearing a catechol moiety was used as a macromolecular coupling agent, as it is known to be miscible to piezoelectric fluoropolymers and catechol groups can strongly bind to a large variety of surfaces. Thus, entanglement between the PMMA chains and the amorphous segments of the fluoropolymer would ensure the desired interfacial adhesion. Well-defined PMMA was synthesized via RAFT polymerization using 2-cyano-2-propyl dodecyl trithiocarbonate as a chaintransfer agent. The PMMA ω-chain end was then functionalized with a catechol group via a one-pot aminolysis/thia-Michael addition procedure using a dopamine acrylamide (DA) derivative as a Michael acceptor. The presence of the catechol moiety at the chain end of PMMA was controlled by 1 H NMR and cyclic voltammetry measurements. The resulting PMMA-DA was then grafted onto the surface of a lead-free piezoelectric ceramic film (i.e., a thin film of H 2 O 2 -activated (Bi 0.5 Na 0.5 )TiO 3 (BNT) with a large contact area). The increase of the water contact angle confirmed the efficiency of the grafting. A commercial piezoelectric copolymer P(VDF-co-TrFE) was then spin-coated onto the modified BNT surface to form a bilayer composite. The composite cross section prepared by cryofracture was examined by scanning electron microscopy and revealed that the ceramic/polymer interface of the BNT-PMMA/P(VDF-co-TrFE) bilayer composite exhibits a much better cohesion than its counterpart composite prepared from nonmodified BNT. Moreover, the grazing incidence wide-angle X-ray scattering confirmed that the copolymer crystal structure was not impacted by the presence of the PMMA-DA coupling agent. A strong piezoelectric response was locally detected by piezoresponse force microscopy. This study highlights the potential of PMMA-DA as a macromolecular coupling agent to improve the ceramic/polymer interface in piezoelectric composite materials.

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Section: Methodsmentioning

confidence: 99%

Section: Syntheses and Preparation Of The Bilayer Composite Synthesis...mentioning

confidence: 99%

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Bouad

Fadel

Mohan

et al. 2022

ACS Appl. Polym. Mater.

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“…Therefore, target composition change cannot be a solution in our case. These results are discussed elsewhere 24 . In this work, a new approach will be highlighted in order to control the Bi contents in the film.…”

Section: Introductionmentioning

confidence: 94%

Composition control of lead‐free piezoelectric BNT thin ceramic films deposited by ex situ sputtering

2021

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(Bi0.5Na0.5)TiO3 thin film growth by ex situ sputtering has been investigated and reported in this paper. An original approach, based on the growth process, was used in order to precisely control the film composition, which has never been reported in BNT growth. The bismuth content in the films and so the composition of amorphous sputtered films was controlled by a slight heating of the substrate during the growth (150–240°C). Then, films were crystallized, obviously without any change in composition, by a post‐annealing treatment. More precisely, without substrate heating and using a stoichiometric target, the film presents an excess of Bi but when it is deposited at 200°C the film becomes stoichiometric. It was shown that the sticking coefficient of Bi is particularly sensitive even at low substrate temperatures, whereas Na and Ti sticking coefficients are not impacted. Followed by a post‐annealing in air at 650°C, the composition of the amorphous BNT films deposited at 200°C remains stoichiometric and the film exhibits a high (100) preferred orientation in a pure perovskite phase and a dense microstructure. The evaluation of the electrical properties as a function of the Bi content in the film, adjusted by the deposition temperature, shows a strong impact on the ferroelectric properties where the best performances were obtained with the stoichiometric BNT film deposited at 200°C.

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“…[15][16][17] Therefore, the strain responses of piezoelectric thin films are generally smaller than those of their ceramic counterparts and it is fairly difficult to improve the strain responses. [18][19][20][21][22][23][24][25] For example, in 2019, Wang et al reported antiferroelectric Pb 1À3x/2 La x ZrO 3 (PLZ-x) thin films with a strain response of B 0.53%, which is lower than that in PbZrO 3 -based bulk materials. 22 However, regarding the most potential materials with a large strain response, BNTbased materials, a strain response of 0.9% was reported in (1 À x)(Bi 0.5 Na 0.5 )TiO 3 -xSrTiO 3 (BNT-xST) thin films.…”

Section: Introductionmentioning

confidence: 99%

Giant strain responses and relaxor characteristics in lead-free (Bi_0.5Na_0.5)TiO₃–BaZrO₃ ferroelectric thin films

et al. 2022

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Synthesis of lead-free (Bi_0,5Na_0,5)TiO₃ thin film by RF magnetron sputtering: Impact of Na on the properties of film

Cited by 8 publications

References 10 publications

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Composition control of lead‐free piezoelectric BNT thin ceramic films deposited by ex situ sputtering

Giant strain responses and relaxor characteristics in lead-free (Bi_0.5Na_0.5)TiO₃–BaZrO₃ ferroelectric thin films

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Synthesis of lead-free (Bi0,5Na0,5)TiO3 thin film by RF magnetron sputtering: Impact of Na on the properties of film

Cited by 8 publications

References 10 publications

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Utilization of Catechol End-Functionalized PMMA as a Macromolecular Coupling Agent for Ceramic/Fluoropolymer Piezoelectric Composites

Composition control of lead‐free piezoelectric BNT thin ceramic films deposited by ex situ sputtering

Giant strain responses and relaxor characteristics in lead-free (Bi0.5Na0.5)TiO3–BaZrO3 ferroelectric thin films

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Synthesis of lead-free (Bi_0,5Na_0,5)TiO₃ thin film by RF magnetron sputtering: Impact of Na on the properties of film

Giant strain responses and relaxor characteristics in lead-free (Bi_0.5Na_0.5)TiO₃–BaZrO₃ ferroelectric thin films