Multilayer Graphene for Flexible Optoelectronic Devices

Marinova, Vera; Petrov, Stefan; Napoleonov, Blagovest; Mickovski, J; Petrova, Dimitrina; Dimitrov, Dimitre; Hsu, Ken Yuh; Lin, Shiuan-Huei

doi:10.3390/iocn2020-07900

“…Therefore, alternative electrodes that can match or surpass ITO’s optical and electrical properties, without any disadvantages, are required. Numerous alternative materials such as carbon nanotubes [ 11 ], graphene [ 12 , 13 , 14 , 15 ], conductive polymers [ 16 , 17 ], and metal nanowires [ 18 , 19 ] have been explored and developed to replace ITO layers. Graphene has recently emerged as a promising alternative owing to its outstanding optical and electrical properties and thermal and chemical stabilities.…”

Section: Introductionmentioning

confidence: 99%

A Graphene-Based Polymer-Dispersed Liquid Crystal Device Enabled through a Water-Induced Interface Cleaning Process

Kim

¹

,

Kim

²

,

Choi

³

et al. 2023

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We report the use of four-layer graphene (4LG) as a highly reliable transparent conductive electrode (TCE) for polymer-dispersed liquid crystal (PDLC)-based smart window devices. The adhesion between 4LG and the substrate was successfully improved through a water-induced interface-cleaning (WIIC) process. We compared the performance of a device with a WIIC-processed 4LG electrode with that of devices with a conventional indium tin oxide (ITO) electrode and a 4LG electrode without a WIIC. With the application of the WIIC process, the PDLC smart window with a 4LG electrode exhibited reduced turn-on voltage and haze compared to 4LG without the WIIC process and characteristics comparable to those of the ITO electrode. The WIIC-processed 4LG electrode demonstrated enhanced electrical properties and better optical performance, leading to improved device efficiency and reliability. Furthermore, our study revealed that the WIIC process not only improved the adhesion between 4LG and the substrate but also enhanced the compatibility and interfacial interactions, resulting in the superior performance of the smart window device. These findings suggest that 4LG with WIIC holds great promise as a transparent conductive electrode for flexible smart windows, offering a cost-effective and efficient alternative to conventional ITO electrodes.

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Three-dimensional self-folding assembly of multi-layer graphene at the interface with a polymeric film

Goto

¹

,

Teshima²,

Sakai

³

et al. 2022

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Three-dimensional (3D) architectures of graphene are of great interest for applications in flexible electronics, supercapacitors, and biointerfaces. Here, we demonstrate that multi-layer graphene (MLG), like single-layer graphene (SLG), can self-fold to form 3D architectures at the interface with a polymeric film. Bilayers composed of graphene and polymeric film tightly adhere to each other and possess a sloped internal strain, which leads to spontaneous rolling to predetermined 3D microscale architectures. The curvature radii of self-folding films can be controlled by changing the thicknesses of the polymeric film and the stacking order. In contrast to single-layer graphene, multi-layer graphene shows no strain in most of the outer graphene layers and linear ohmic current characteristics after self-folding. Throughout the self-folding process, the conductance of MLG decreases but remains higher than that of SLG. This versatile way of forming a 3D multi-layer graphene structure is potentially applicable for fabrication of practical carbon devices without the changes in their conductive properties.

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Graphene-Based PDLC Device Enabled by Water-Induced Interface Cleaning Process

Kim¹,

Kim²,

Choi³

et al. 2023

Preprint

1

0

View full text Add to dashboard Cite

We report the use of four-layer graphene (4LG) as a highly reliable transparent conductive electrode (TCE) for polymer-dispersed liquid crystal (PDLC)-based smart window devices. The adhesion between 4LG and the substrate was successfully improved through a water-induced interface-cleaning (WIIC) process. We compared the performance of a device with a WIIC-processed 4LG electrode with that of devices with a conventional Indium tin oxide (ITO) electrode and a 4LG electrode without a WIIC. With the application of the WIIC process, the PDLC smart window with a 4LG electrode exhibited reduced turn-on voltage and haze compared to 4LG without the WIIC process and characteristics comparable to those of the ITO electrode. Based on our observations, we conclude that 4LG with WIIC is a promising TCE for flexible smart windows.

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Multilayer Graphene for Flexible Optoelectronic Devices

Cited by 3 publications

References 22 publications

A Graphene-Based Polymer-Dispersed Liquid Crystal Device Enabled through a Water-Induced Interface Cleaning Process

A Graphene-Based Polymer-Dispersed Liquid Crystal Device Enabled through a Water-Induced Interface Cleaning Process

Three-dimensional self-folding assembly of multi-layer graphene at the interface with a polymeric film

Graphene-Based PDLC Device Enabled by Water-Induced Interface Cleaning Process

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