Photoswitching of the dielectric property of salicylideneaniline

Shimayama, Kodai; Karim, Mohammad Razaul; Amolegbe, Saliu Alao; Nakaya, Manabu; Nakamura, Masaaki; Ohtani, Ryo; Lndoy, Leonard F.; Hayami, Shinya

doi:10.1007/s10847-015-0524-9

Cited by 8 publications

(9 citation statements)

References 20 publications

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“…16 ), and its tunable permittivity range ( ε ′ = ~200–18,000) is the widest among the permittivity ranges reported for organic and organic/inorganic materials. Importantly, tunability (range and extent) of our LC blend is far beyond those of the previously reported phototunable materials 40 – 44 . It is worth noting that our LC blend is fluid, whereas most of the reported materials are solids.…”

Section: Resultsmentioning

confidence: 66%

“…As dielectric permittivity is a fundamental parameter that dominates various physical phenomena and properties of materials, many researchers have attempted to tune its value using external stimuli such as photo 40 – 44 , thermo 45 – 51 , electro 52 , 53 , mechano 54 , and chemo stimuli 55 , 56 . The tunable permittivity range, ( ε ′ max − ε ′ min ) and relative tunability, [( ε ′ max − ε ′ min )/ ε ′ max ] of our LC blend ([Azo-F] = 4 wt%) and other reported materials, including organic, inorganic and organic/inorganic hybrid materials, are summarised in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Anisotropic fluid with phototunable dielectric permittivity

2022

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Dielectric permittivity, a measure of polarisability, is a fundamental parameter that dominates various physical phenomena and properties of materials. However, it remains a challenge to control the dielectric permittivity of materials reversibly over a large range. Herein, we report an anisotropic fluid with photoresponsive dielectric permittivity (200 < ε < 18,000) consisting of a fluorinated liquid-crystalline molecule (96 wt%) and an azobenzene-tethered phototrigger (4 wt%). The reversible trans-cis isomerisation of the phototrigger under blue and green light irradiation causes a switch between two liquid-crystalline phases that exhibit different dielectric permittivities, with a rapid response time (<30 s) and excellent reversibility (~100 cycles). This anisotropic fluid can be used as a flexible photovariable capacitor that, for example, allows the reversible modulation of the sound frequency over a wide range (100 < f < 8500 Hz) in a remote manner using blue and green wavelengths.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Anisotropic fluid with phototunable dielectric permittivity

2022

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“…Meanwhile, the functional —OH groups and the intramolecular O—H···N hydrogen bonds with asymmetric distribution of charges in the cis ‐enol form contribute to a higher ε ′ value, as found in other hydrogen‐bonded organic compounds. [ 30 ]…”

Section: Resultsmentioning

confidence: 99%

Optically Induced Ferroelectric Polarization Switching in a Molecular Ferroelectric with Reversible Photoisomerization

et al. 2021

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Ferroelectrics usually exhibit temperature‐triggered structural changes, which play crucial roles in controlling their physical properties. However, although light is very striking as a non‐contact, non‐destructive, and remotely controlled external stimuli, ferroelectric crystals with light‐triggered structural changes are very rare, which holds promise for optical control of ferroelectric properties. Here, an organic molecular ferroelectric, N‐salicylidene‐2,3,4,5,6‐pentafluoroaniline (SA‐PFA), which shows light‐triggered structural change of reversible photoisomerization between cis‐enol and trans‐keto configuration is reported. SA‐PFA presents clear ferroelectricity with the saturate polarization of 0.84 μC cm−2, larger than those of some typical organic ferroelectrics with thermodynamically structural changes. Benefit from the reversible photoisomerization, the dielectric real part of SA‐PFA can be reversibly switched by light. More strikingly, the photoisomerization enables SA‐PFA to show reversible optically induced ferroelectric polarization switching. Such intriguing behaviors make SPFA a potential candidate for application in next‐generation photo‐controlled ferroelectric devices. This work sheds light on further exploration of more excellent molecular ferroelectrics with light‐triggered structural changes for optical control of ferroelectric properties.

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“…However, there are only two reported examples of switchable bistable dielectric materials at RT up to now, one of which is from our group. 18,19 Shimayama et al observed that the dielectric permittivity of salicylideneaniline fell by 33% (100 Hz) at RT when it underwent H-transfer in the photochromic process. 18 However, recently we reported that a photochromic semiconductor, [Pb 3 Br 6 (CV)] n (CV = N,N′-4,4′-bipyridiniodipropionate, PSC-2), showed a dielectric permittivity increase of ∼689% (3 kHz) at RT through photoinduced electron transfer (PIET) from a lead-bromide lattice to a viologen cations derivatives.…”

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confidence: 99%

“…18,19 Shimayama et al observed that the dielectric permittivity of salicylideneaniline fell by 33% (100 Hz) at RT when it underwent H-transfer in the photochromic process. 18 However, recently we reported that a photochromic semiconductor, [Pb 3 Br 6 (CV)] n (CV = N,N′-4,4′-bipyridiniodipropionate, PSC-2), showed a dielectric permittivity increase of ∼689% (3 kHz) at RT through photoinduced electron transfer (PIET) from a lead-bromide lattice to a viologen cations derivatives. 19 Why the dielectric permittivity increase or decrease for the two types of photochromic processes, respectively?…”

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confidence: 99%

Photochromic Semiconductors with Record-High Dielectric Permittivity Gain at Room Temperature

Sun

Wang

2021

ACS Appl. Electron. Mater.

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Bistable-state dielectric properties without maintaining external stimuli after switching are highly desirable for nonvolatile memory devices; however, research on switchable dielectric materials was mostly limited to the stimulation-constant mode. This work reports a record-high dielectric permittivity gain through the bistable-state modulation mode in two photochromic semiconductors (PSCs), and reveals the general structure characteristic and intrinsic physical reasons for the increase of dielectric permittivity. This discovery will guide the design for switchable dielectric materials with dielectric permittivity gain in the future.

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Photoswitching of the dielectric property of salicylideneaniline

Cited by 8 publications

References 20 publications

Anisotropic fluid with phototunable dielectric permittivity

Anisotropic fluid with phototunable dielectric permittivity

Optically Induced Ferroelectric Polarization Switching in a Molecular Ferroelectric with Reversible Photoisomerization

Photochromic Semiconductors with Record-High Dielectric Permittivity Gain at Room Temperature

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