Integrated Charge Transfer in Organic Ferroelectrics for Flexible Multisensing Materials

Xu, Beibei; Ren, Shenqiang

doi:10.1002/smll.201600980

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…All these requirements impose challenges for conventional piezoelectric ceramics, which needs high processing temperatures, have almost no mechanical flexibility and contain potential toxic elements. A way to overcome this problem is to use polymer based ME composites that can provide colossal ME response due to a large piezoelectric stress coefficient and a great displacement transfer capability of the polymer [1,2,[7][8][9][10][11][12][13][14]. Recent developments on polymer processing [15] show the possibility of obtaining high dielectric constant and low dielectric loss by easy fabrication strategies.…”

Section: Introductionmentioning

confidence: 99%

Spin Coating and Micro-Patterning Optimization of Composite Thin Films Based on PVDF

et al. 2020

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We optimize the elaboration of very thin film of poly(vinylidene fluoride) (PVDF) polymer presenting a well-controlled thickness, roughness, and nano-inclusions amount. We focused our effort on the spin coating elaboration technique which is easy to transfer to an industrial process. We show that it is possible to obtain continuous and smooth thin films with mean thicknesses of 90 nm by properly adjusting the concentration and the viscosity of the PVDF solution as well as the spin rate and the substrate temperature of the elaboration process. The electro-active phase content versus the magnetic and structural properties of the composite films is reported and fully discussed. Last but not least, micro-patterning optical lithography combined with plasma etching has been used to obtain well-defined one-dimensional micro-stripes as well as squared-rings, demonstrating the easy-to-transfer silicon technology to polymer-based devices.

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Section: Introductionmentioning

confidence: 99%

Spin Coating and Micro-Patterning Optimization of Composite Thin Films Based on PVDF

et al. 2020

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“…Therefore, organic materials have become an attractive topic not only due to the remarkable structural variability and highly tunable properties, but also due to their potential applications in light sources, photovoltaics, and electronics. 8 Recently, a breakthrough of piezoelectric material was reported by Yu-Meng You, Ren-Gen Xiong, and colleagues. 9 Based on molecular design strategy and elaborate organic cation selection, they successfully synthesized a family of metal-free organic perovskite ferroelectrics.…”

Section: Introductionmentioning

confidence: 99%

Large piezoelectric response in a family of metal-free perovskite ferroelectric compounds from first-principles calculations

et al. 2019

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Metal-free organic perovskite ferroelectric materials have been shown recently to have a number of attractive properties, including high spontaneous polarization and piezoelectric coefficients. In particular, slow evaporation of solutions containing organic amines, inorganic ammoniums, and dilute hydrohalogen acid has been shown to produce several attractive materials in the MDABCO-NH 4 -I 3 family (MDABCO is N-methyl-N'-diazabicyclo[2,2,2] octonium). In the present work, we study by first-principles calculations the origin of polarizaiton, electronic density of state, piezoelectric response, and elastic properties of MDABCO-NH 4 -X 3 (X = Cl, Br, I). We find that the dipole moments of the MDABCO and NH 4 groups are negligible, and the large spontaneous polarization of MDABCO-NH 4 -I 3 mainly results from MDABCO and NH 4 being off-center relative to I ions. Although the piezoelectric response of organic materials is usually very weak, we observe large piezoelectric strain components, d x4 and d x5 ; the calculated d x5 is 119 pC/N for MDABCO-NH 4 -Cl 3 , 248 pC/N for MDABCO-NH 4 -Br 3 and 178 pC/N for MDABCO-NH 4 -I 3 . The large value of d x5 is found to be closely related with the large value of elastic compliance tensor, s 44 . These results show that MDABCO-NH 4 -X 3 metal-free organic perovskites have large piezoelectric response with soft elastic properties.npj Computational Materials (2019) 5:17 ; https://doi.

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“…Herein, the micropillar or microdome array has been widely investigated for the potential high pixel density. Various techniques have been developed to prepare the arrays, such as the subtractive processes, additive processes, and micromolding technique . However, the technologies still have limitations to apply for businesses large‐scale manufacturing, such as complex processes, difficult operations, time‐consuming steps, costly materials or machines, and relatively low production efficiency.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Multifunctional Magnetoresistive Strain Sensor Based on Hair‐Like Magnetization‐Induced Pillar Forests

Ding

Pei

Xuan

et al. 2019

Adv Elect Materials

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mechanic-resistive, [7] have been proposed and implemented in the design of electronic systems. Although such systems have undergone rapid growth and can satisfy or surpass the subtle sensing properties of human skin, it is still challenging to develop flexible electronics with multimodal sensing capabilities to detect manifold environmental changes. The contact-type mechanic-resistive sensors convert mechanical displacements into impedance changes and have gained tremendous interest owing to their simple read-out mechanism and higher sensitivity to pressure. [8-10] Herein, the micropillar or microdome array has been widely investigated for the potential high pixel density. Various techniques have been developed to prepare the arrays, such as the subtractive processes, additive processes, and micromolding technique. [11-15] However, the technologies still have limitations to apply for businesses large-scale manufacturing, such as complex processes, difficult operations, time-consuming steps, costly materials or machines, and relatively low production efficiency. For example, in the subtractive processes, the three-dimensional structures are selectively carved out of a two-dimensional (2D) substrate, including lithography with wet or dry etching, micromachining, laser cutting, electroplating, and wire electrode cutting. [15,16] Moreover, most precision technology manufacturing array structures are rigid, which are incompatible for the required flexible electronic components. Above all, challenges remain for the simple, scalable, low-cost, and rapid fabrication. Remarkably, there are many attempts to realize the functions and capabilities beyond the human skin, such as superhydrophobicity, [17] anti-freezing, [18] proximity detection, [19] magnetoreception, [20] self-healing, [21] and electromagnetic interference shielding. [22] These additional features that humans do not possess are challenging and attractive, which may greatly expand the application range of artificial electronic systems. [23,24] Among them, magneto-reception is a sensing capability which allows organisms, such as bacteria, ants, bees, pigeons, and whales to detect the earth's magnetic field for orientation and navigation. By endowing artificial electronics with magnetic field sensing capability, flexible magnetic sensors are believed to open up new areas for the future of intelligent wearable An ultrasensitive multifunctional sensor which integrates tactile sensing and magnetism sensing together in one device is presented. The sensor, dubbed L-MPF, consists of two interlocking hair-like magnetizationinduced pillar forests, which are self-formed under a magnetic field and a loading pressure. An L-MPF endows intelligent electronics with magnetic field reception, which is the sense of bacteria, birds, and whales, rather than human beings. It is found that the L-MPF precisely detects the magnitude and the loading path of the dynamic load, including pressure, shear, and magnetic field, with fast response, high reversibility, excellent sensitivity, a...

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Integrated Charge Transfer in Organic Ferroelectrics for Flexible Multisensing Materials

Cited by 11 publications

References 31 publications

Spin Coating and Micro-Patterning Optimization of Composite Thin Films Based on PVDF

Spin Coating and Micro-Patterning Optimization of Composite Thin Films Based on PVDF

Large piezoelectric response in a family of metal-free perovskite ferroelectric compounds from first-principles calculations

Ultrasensitive Multifunctional Magnetoresistive Strain Sensor Based on Hair‐Like Magnetization‐Induced Pillar Forests

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