Stable dielectric response of low-loss aromatic polythiourea thin films on Pt/SiO<sub>2</sub> substrate

Eršte, A.; Fulanović, Lovro; Čoga, Lucija; Lin, Minren; Thakur, Yash; Zhang, Q. M.; Bobnar, V.

doi:10.1142/s2010135x1650003x

Cited by 6 publications

(5 citation statements)

References 13 publications

(12 reference statements)

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“…In addition, the aromatic rings hinder the dipole–dipole coupling between thiourea groups, which great reduce large dielectric losses in the ArPTU dielectrics. However, due to the poor solvent processing, ArPTU films were usually fabricated through vapor deposition polymerization or casting on silicon substrates, which are difficult to enlarge for scale production. Moreover, the rigid molecular structure makes ArPTU brittle and unsuitable as a flexible dielectric film .…”

Section: Introductionmentioning

confidence: 99%

All-Organic Cross-Linked Polysiloxane-Aromatic Thiourea Dielectric Films for Electrical Energy Storage Application

Liu

Chen

Jiang

et al. 2020

ACS Appl. Energy Mater.

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The development of high-power-density energy storage devices and systems calls for high-dielectric-constant (high-k) polymer films with low dielectric loss. Aromatic polythiourea attracts many interests because of its low dielectric loss and high beakdown strength, whereas the high brittleness significantly limits its application as dielectric films. In this report, flexible high-k films were successfully fabricated by cross-linking aromatic thiourea oligomers with allyl glycidyl ether grafted poly(methylhydrosiloxane) (PMHS). Siloxane segments of PMHS improve the flexibility of the cross-linked dielectric films, and the grafted glycidyl ether side groups of PMHS provide highly polarizable building blocks. Because of the high dipole moment (4.89 D), aromatic thiourea endows the dielectric films with a high dielectric constant. Microphase separation morphology was found within the film, and the self-assembly into layered lamellae contributed to the scatter of high-energy-charge carriers. As a result, the dielectric films exhibit reduced dielectric loss tangent and suppressed leakage current density with a high dielectric constant of above 6, a promissing energy density of 3.15 J/cm3 and a high efficiency of above 87% under an electric field of 350 MV/m.

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Section: Introductionmentioning

confidence: 99%

All-Organic Cross-Linked Polysiloxane-Aromatic Thiourea Dielectric Films for Electrical Energy Storage Application

Liu

Chen

Jiang

et al. 2020

ACS Appl. Energy Mater.

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“…Figure shows the frequency dependence of the real ɛ′(ω) parts of the complex dielectric constant on a semi‐log scale at room temperatures in the parallel plate device under test for PMMA(Chol‐ n ‐MMA), and PMMA(Chol‐ n ‐MMA‐ co ‐MMA). As seen in Figure , all the polymers have shown almost constant value of ɛ′(ω) at low frequencies up to 10 kHz, indicating a stable dielectric response over a wide frequency band (100 Hz–10 kHz) . In higher frequencies, especially after 10 kHz nearly all polymers show dielectric relaxation.…”

Section: Resultsmentioning

confidence: 74%

Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism

Doğancı

Çakırlar

Bayır

et al. 2017

J of Applied Polymer Sci

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Methacrylate based side‐chain liquid crystalline polymers (SCLCP) bearing cholesterol pendant moieties with various lengths of aliphatic spacer were synthesized and their electrical conductivity mechanism was studied for their possible applications in elastic microelectronic devices. All the polymers exhibited liquid crystalline behavior of broken focal‐conic fan texture of smectic phase. The dielectric properties of polymers were investigated by impedance spectroscopic technique in the frequency range of 100 Hz to 15 MHz at room temperature. Alternating current (AC) conductivity ( σAC) of the liquid crystalline polymeric films was observed to vary with angular frequency, ω as ωS with s < 2. Detailed conductivity analysis revealed that the conductivity of the polymeric films follows quantum mechanical tunneling and correlated barrier hoping conductivity mechanisms at low frequency regime, whereas it obeys super linear power law and direct current conductivity mechanisms at high frequency region. The investigation of the SCLC polymeric films helped to propose a model system for their possible potential applications. In the light of this study, the SCLC polymers will be employed as the gate insulator for organic field effect transistor applications, such as large area flexible arrays or as other advanced microelectronic devices that have superior performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45207.

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“…Polythiourea (PTU) and its blends have been extensively studied for application in capacitor dielectrics due to their high dielectric constant, high breakdown field and low dielectric loss [ 14 , 15 , 16 ]. It has also been applied as an elastomeric coating material [ 17 , 18 ] where some have been commercially used.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Performance of PTU-Cu Composite Membrane Fabricated through Simultaneous Complexation and Non-Solvent Induced Phase Separation

2021

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This study aims to integrate copper (Cu) during membrane formation by a facile simultaneous phase separation process to alleviate biofouling and improve membrane performance. Polythiourea (PTU) polymer synthesized through condensation polymerization of 4,4-oxydianiline and p-phenylene diisothiocyanate in dimethyl sulfoxide was used in the preparation of dope solution. By incorporating different concentrations of cupric acetate in the non-solvent bath, both non-solvent induced phase separation and complexation induced phase separation occur instantaneously. Scanning electron microscopy—energy dispersive X-ray, fourier-transform infrared spectroscopy and time-of-flight secondary ion mass spectroscopy analysis accompanied by color change of the membrane surfaces—confirms the interaction of the polymer with Cu. Interaction of Cu at the interface during membrane formation results in a decrease in contact angle from 2 to 10° and a decrease in surface roughness from 30% to 52% as measured by atomic force microscope analysis. Pure water flux of PTU-Cu membrane increased by a factor of 3 to 17 relative to pristine PTU membrane. Both the pristine PTU and PTU-Cu membrane showed antibacterial characteristics against E. coli.

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Stable dielectric response of low-loss aromatic polythiourea thin films on Pt/SiO₂ substrate

Cited by 6 publications

References 13 publications

All-Organic Cross-Linked Polysiloxane-Aromatic Thiourea Dielectric Films for Electrical Energy Storage Application

All-Organic Cross-Linked Polysiloxane-Aromatic Thiourea Dielectric Films for Electrical Energy Storage Application

Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism

Characteristics and Performance of PTU-Cu Composite Membrane Fabricated through Simultaneous Complexation and Non-Solvent Induced Phase Separation

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Stable dielectric response of low-loss aromatic polythiourea thin films on Pt/SiO2 substrate

Cited by 6 publications

References 13 publications

All-Organic Cross-Linked Polysiloxane-Aromatic Thiourea Dielectric Films for Electrical Energy Storage Application

All-Organic Cross-Linked Polysiloxane-Aromatic Thiourea Dielectric Films for Electrical Energy Storage Application

Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism

Characteristics and Performance of PTU-Cu Composite Membrane Fabricated through Simultaneous Complexation and Non-Solvent Induced Phase Separation

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Stable dielectric response of low-loss aromatic polythiourea thin films on Pt/SiO₂ substrate