scholarly journals hBN Flake Embedded Al2O3 Thin Film for Flexible Moisture Barrier

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7373
Author(s):  
Wonseok Jang ◽  
Seunghun Han ◽  
Taejun Gu ◽  
Heeyeop Chae ◽  
Dongmok Whang
Keyword(s):  
Thin Film ◽  
Mechanical Stability ◽  
Hexagonal Boron Nitride ◽  
Critical Role ◽  
Composite Layer ◽  
Diffusion Path ◽  
Layer By Layer ◽  
Moisture Barrier ◽  
Organic Optoelectronic ◽  
Al2o3 Thin Film

Due to the vulnerability of organic optoelectronic devices to moisture and oxygen, thin-film moisture barriers have played a critical role in improving the lifetime of the devices. Here, we propose a hexagonal boron nitride (hBN) embedded Al2O3 thin film as a flexible moisture barrier. After layer-by-layer (LBL) staking of polymer and hBN flake composite layer, Al2O3 was deposited on the nano-laminate template by spatial plasma atomic layer deposition (PEALD). Because the hBN flakes in Al2O3 thin film increase the diffusion path of moisture, the composite layer has a low water vapor transmission ratio (WVTR) value of 1.8 × 10−4 g/m2 day. Furthermore, as embedded hBN flakes restrict crack propagation, the composite film exhibits high mechanical stability in repeated 3 mm bending radius fatigue tests.

scholarly journals Carbon Nano-Onions Reinforced Multilayered Thin Film System for Stimuli-Responsive Drug Release

Pharmaceutics ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 1208
Author(s):  
Narsimha Mamidi ◽  
Ramiro Velasco Delgadillo ◽  
Aldo Gonzáles Ortiz ◽  
Enrique Barrera
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Drug Release ◽  
Self Assembly ◽  
Critical Role ◽  
Layer By Layer ◽  
Film System ◽  
Stimuli Responsive ◽  
Ph Responsive ◽  
Thin Film System

Herein, poly (N-(4-aminophenyl) methacrylamide))-carbon nano-onions (PAPMA-CNOs = f-CNOs) and anilinated-poly (ether ether ketone) (AN-PEEK) have synthesized, and AN-PEEK/f-CNOs composite thin films were primed via layer-by-layer (LbL) self-assembly for stimuli-responsive drug release. The obtained thin films exhibited pH-responsive drug release in a controlled manner; pH 4.5 = 99.2% and pH 6.5 = 59.3% of doxorubicin (DOX) release was observed over 15 days. Supramolecular π-π stacking interactions between f-CNOs and DOX played a critical role in controlling drug release from thin films. Cell viability was studied with human osteoblast cells and augmented viability was perceived. Moreover, the thin films presented 891.4 ± 8.2 MPa of the tensile strength (σult), 43.2 ± 1.1 GPa of Young’s modulus (E), and 164.5 ± 1.7 Jg−1 of toughness (K). Quantitative scrutiny revealed that the well-ordered aligned nanofibers provide critical interphase, and this could be responsible for augmented tensile properties. Nonetheless, a pH-responsive and mechanically robust biocompatible thin-film system may show potential applications in the biomedical field.

Fabrication of layer-by-layer graphene oxide thin film on copper substrate by electrophoretic deposition

2020 ◽  
Vol 59 (12) ◽  
pp. 125001
Author(s):  
Nan Ye ◽  
Satoka Ohnishi ◽  
Mitsuhiro Okada ◽  
Kazuto Hatakeyama ◽  
Kazuhiko Seki ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Copper Substrate ◽  
Oxide Thin Film ◽  
Layer By Layer ◽  
Layer Graphene

scholarly journals Flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Long Hu ◽  
Qian Zhao ◽  
Shujuan Huang ◽  
Jianghui Zheng ◽  
Xinwei Guan ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
High Performance ◽  
Mechanical Stability ◽  
Mechanical Adhesion ◽  
Perovskite Quantum Dots ◽  
Efficient Charge ◽  
Photovoltaic Technologies

AbstractAll-inorganic CsPbI3 perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. These quantum dot devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. We demonstrate higher mechanical endurance of quantum dot films compared to bulk thin film and highlight the importance of further research on high-performance and flexible optoelectronic devices using nanoscale grains as an advantage. Specifically, we develop a hybrid interfacial architecture consisting of CsPbI3 quantum dot/PCBM heterojunction, enabling an energy cascade for efficient charge transfer and mechanical adhesion. The champion CsPbI3 quantum dot solar cell has an efficiency of 15.1% (stabilized power output of 14.61%), which is among the highest report to date. Building on this strategy, we further demonstrate a highest efficiency of 12.3% in flexible quantum dot photovoltaics.

Radical-triggered cross-linking for molecular layer deposition of SiAlCOH hybrid thin films

2021 ◽  
Author(s):  
Kristina Ashurbekova ◽  
Karina Ashurbekova ◽  
Iva Saric ◽  
Evgeny Modin ◽  
Mladen Petravic ◽  
...  
Keyword(s):  
Thin Film ◽  
Film Growth ◽  
Molecular Layer ◽  
Thin Film Growth ◽  
Cross Linking ◽  
Layer By Layer ◽  
Molecular Layer Deposition ◽  
Layer Deposition ◽  
Hybrid Thin Films ◽  
Enhanced Stability

We developed a thin film growth with a radical-initiated cross-linking of vinyl groups in a layer-by-layer manner via molecular layer deposition (MLD). The cross-linked film exhibited improved properties like 12% higher density and enhanced stability compared to the non-cross-linked film.

Layer-by-Layer Assembled Transparent Conductive Graphene Films for Silicon Thin-Film Solar Cells

2012 ◽  
Vol 51 ◽  
pp. 11PF01 ◽  
Author(s):  
Ryousuke Ishikawa ◽  
Masashi Bando ◽  
Hidetoshi Wada ◽  
Yasuyoshi Kurokawa ◽  
Adarsh Sandhu ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Thin Film Solar Cells ◽  
Layer By Layer ◽  
Silicon Thin Film ◽  
Graphene Films

The Influence of Moisture Barrier Films in ZnO-Based Thin Film Transistors

2012 ◽  
Vol 159 (4) ◽  
pp. H353-H357 ◽  
Author(s):  
Woong-Sun Kim ◽  
Sae-Young Shin ◽  
Jong-Wan Park
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Moisture Barrier ◽  
Barrier Films
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