Practical ALD method for improving gas barrier properties of plastic bottles

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-07-24 DOI:10.1016/j.apsusc.2025.164151

Hiroshi Fujimori , Yoshihide Yamada , Masaki Kawano , Yukari Mikami , Daisuke Tadaki , Ayumi Hirano-Iwata , Akemi Kumagai , Tomohiro Miyata , Hiroshi Jinnai , Emiko Takemoto , Michio Niwano

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Abstract

Plastic bottles are widely used as containers for food and cosmetics. The contents in a container can deteriorate due to oxidation when oxygen enters the container through the wall. To address this limitation, in this study, we investigated a practical technique for depositing a silicon oxide film as a gas barrier on the bottle wall using the atomic layer deposition (ALD) method. A test machine capable of depositing a batch of approximately 40 plastic bottles was built. Various properties, such as the gas barrier properties, composition, and film thickness, of the oxide film deposited at room temperature were investigated. The water resistance of the film was examined via infrared spectroscopy and oxygen transmission rate (OTR) measurements. The results demonstrated that water molecules trapped in the gaps of the SiO₂ network remained in the ALD film. The OTR decreased with film thickness. The OTR (in units of cc/pkg(package)/day) of the 40-nm-thick films was 0.4–2 × 10⁻³, which is less than one-tenth of that of the uncoated bottle. Water immersion degraded the barrier properties of the ALD films. However, films that exhibited good barrier properties before water immersion showed a lower degree of degradation after water immersion.

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提高塑料瓶气体阻隔性能的ALD实用方法

塑料瓶被广泛用作食品和化妆品的容器。当氧气通过容器壁进入容器时，容器内的内容物会因氧化而变质。为了解决这一限制，在本研究中，我们研究了一种使用原子层沉积（ALD）方法在瓶壁上沉积氧化硅膜作为气体屏障的实用技术。建造了一台能够沉积一批约40个塑料瓶的测试机器。研究了在室温下沉积的氧化膜的各种性能，如气体阻隔性能、成分和膜厚度。通过红外光谱和氧透过率（OTR）测试了膜的耐水性。结果表明，被困在SiO2网络缝隙中的水分子仍留在ALD膜中。OTR随膜厚的增加而减小。40纳米厚薄膜的OTR（单位为cc/pkg（包）/天）为0.4-2 × 10−3，不到未涂膜瓶的十分之一。水浸降低了ALD膜的阻隔性能。然而，在水浸前具有良好阻隔性能的薄膜，在水浸后降解程度较低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.