Coupling Mechanical and Electrical Properties in Spin Crossover Polymer Composites

Rat, Sylvain; Piedrahita‐Bello, Mario; Salmon, Lionel; Molnár, Gábor; Demont, Philippe; Bousseksou, Azzedine

doi:10.1002/adma.201705275

Cited by 97 publications

(75 citation statements)

References 41 publications

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“…In this context the attractive actuating properties of SCO materials represent also a very appealing scope. Macroscopic SCO actuators have been recently created by embedding SCO particles in polymer matrices . Particles of the SCO complex [Fe(Htrz) 2 (trz)](BF 4 ) were dispersed in a poly(methylmethacrylate) matrix by Gural'skiy et al and the composite films were then coated with a conducting polymer layer to form a bimorph cantilever.…”

Section: Device Integrationmentioning

confidence: 99%

“…Of particular interest here will be the use of electroactive polymers, which can allow for conversion between mechanical and electrical forms of energy via the electromechanical effect. This approach was successfully used to modulate the conductivity of piezoresistive polypyrrol via the SCO and also to generate discharge current and mechanical actuation peaks in P(VDF‐TrFE) matrices . For future work in this direction it will be thus particularly important to investigate how the microscopic mechanical response of the SCO particles is transmitted, amplified, and converted concomitantly into macroscopic scale mechanical and/or electrical responses by the polymer matrix material.…”

Section: Device Integrationmentioning

confidence: 99%

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Spin Crossover Nanomaterials: From Fundamental Concepts to Devices

et al. 2017

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Nanoscale spin crossover materials capable of undergoing reversible switching between two electronic configurations with markedly different physical properties are excellent candidates for various technological applications. In particular, they can serve as active materials for storing and processing information in photonic, mechanical, electronic, and spintronic devices as well as for transducing different forms of energy in sensors and actuators. In this progress report, a brief overview on the current state-of-the-art of experimental and theoretical studies of nanomaterials displaying spin transition is presented. Based on these results, a detailed analysis and discussions in terms of finite size effects and other phenomena inherent to the reduced size scale are provided. Finally, recent research devices using spin crossover complexes are highlighted, emphasizing both challenges and prospects.

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Section: Device Integrationmentioning

confidence: 99%

Section: Device Integrationmentioning

confidence: 99%

Spin Crossover Nanomaterials: From Fundamental Concepts to Devices

et al. 2017

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“…Another interesting perspective consists of the viscoelastic mapping of SCO nanoparticle–polymer composites. In these dynamic and heterogeneous systems, strain coupling plays often an important role, but the corresponding microscopic mechanisms remain difficult to visualize by other methods.…”

Section: Comparison Of Reported Elastic Moduli Ofmentioning

confidence: 99%

Direct Visualization of Local Spin Transition Behaviors in Thin Molecular Films by Bimodal AFM

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Piedrahita‐Bello

et al. 2019

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Thin films of the molecular spin‐crossover complex [Fe(HB(1,2,4‐triazol‐1‐yl)3)2] undergo spin transition above room temperature, which can be exploited in sensors, actuators, and information processing devices. Variable temperature viscoelastic mapping of the films by atomic force microscopy reveals a pronounced decrease of the elastic modulus when going from the low spin (5.2 ± 0.4 GPa) to the high spin (3.6 ± 0.2 GPa) state, which is also accompanied by increasing energy dissipation. This technique allows imaging, with high spatial resolution, of the formation of high spin puddles around film defects, which is ascribed to local strain relaxation. On the other hand, no clustering process due to cooperative phenomena was observed. This experimental approach sets the stage for the investigation of spin transition at the nanoscale, including phase nucleation and evolution as well as local strain effects.

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“…Spin-crossover (SCO) compounds are an important class of molecular switches which are widely studied in molecular materials chemistry [1][2][3]. The SCO switching event changes a number of physical properties in a material including its colour, magnetic moment [4], volume [5], dielectric properties [6][7][8][9], conductivity [9][10][11][12], and fluorescence [13][14][15]. Solid or mesophase phase transitions and isotropic melting can also be coupled to spin transitions in soft materials containing SCO centres [16,17].…”

Section: Introductionmentioning

confidence: 99%

Five 2,6-Di(pyrazol-1-yl)pyridine-4-carboxylate Esters, and the Spin States of their Iron(II) Complexes

2019

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Two phenyl ester and three benzyl ester derivatives have been synthesized from 2,6-di(pyrazol-1-yl)pyridine-4-carboxylic acid and the appropriate phenyl or benzyl alcohol using N,N’-dicyclohexylcarbodiimide as the coupling reagent. Complexation of the ligands with Fe[BF4]2·6H2O in acetone yielded the corresponding [FeL2][BF4]2 complex salts. Four of the new ligands and four of the complexes have been crystallographically characterised. Particularly noteworthy are two polymorphs of [Fe(L3)2][BF4]2·2MeNO2 (L3 = 3,4-dimethoxyphenyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), one of which is crystallographically characterised as high-spin while the other exhibits the onset of spin-crossover above room temperature. The other complexes are similarly low-spin at low temperature but exhibit gradual spin-crossover on heating, except for an acetone solvate of [Fe(L5)2][BF4]2 (L5 = benzyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), which exhibits a more abrupt spin-transition at T½ = 273 K with 9 K thermal hysteresis.

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Coupling Mechanical and Electrical Properties in Spin Crossover Polymer Composites

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 19383To link to this article :

Cited by 97 publications

References 41 publications

Spin Crossover Nanomaterials: From Fundamental Concepts to Devices

Spin Crossover Nanomaterials: From Fundamental Concepts to Devices

Direct Visualization of Local Spin Transition Behaviors in Thin Molecular Films by Bimodal AFM

Five 2,6-Di(pyrazol-1-yl)pyridine-4-carboxylate Esters, and the Spin States of their Iron(II) Complexes

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