水蒸气辅助石墨烯光学可视化
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- 英文论文题名：Water-assist direct optical visualization of graphene
- 论文作者：夏凯伦 ; 张莹莹
- 英文论文作者：Kailun Xia ; Yingying Zhang ; Department of Chemistry & Center for Nano and Micro Mechanics ; Tsinghua University
- 年：2016
- 作者机构：清华大学化学系&清华大学微纳米力学中心;
- 论文关键词：石墨烯 ; 水蒸气 ; 光学可视化 ; 润湿行为
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十一分会：纳米材料与器件
- 语种：中文
- 分类号：TQ127.11
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十一分会 ; 纳米材料与器件
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：105k
- 原文格式：D
- 会议级别：全国
摘要
近年来,石墨烯独特的润湿行为受到了广泛的关注。此外,水的蒸发和凝结又是生活中最常见的现象,本工作中,我们利用了石墨烯独特的润湿行为和水的蒸发、凝结现象,实现了石墨烯在各种基底表面(例如硅片,石英、载玻片、PDMS等)光学可视化。在喷射水蒸气数秒后,基底上的石墨烯就会显现出来;当停止喷射水蒸气,待水滴蒸发后,石墨烯又不再可见。我们发现,石墨烯在这些基底表面是部分润湿透明的,基底和石墨烯表面的润湿行为的差异会导致表面凝结的水滴在形态、密度以及分布上出现差异,并且基底上的水在石墨烯的边界位置会产生明显的边界效应,这些实现了石墨烯的可视化。而且,这种方法也可以分辨出单层和非单层石墨烯。这种方法简单、高效、可重复,在石墨烯以及其他二维材料的应用上有很大的潜力。
Graphene has unique water wetting properties, which has drawn great research interests recently. On the other side, water condensation and evaporation is a natural phenomenon in our daily life. By combining these, we develop a facile optical visualization approach for graphene on a variety of substrates simply with the assistance of water vapor. We show that graphene is visible when it is not fully transparent to wetting for the underlying substrates. The different wetting behavior of graphene-covered and uncovered surface leads to the difference in the distribution and morphology of water droplets, also gives rise to the interesting confining wall effect of the graphene edge, contributing to the observation of graphene. Moreover, this approach also enables the distinguishing of monolayer and non-monolayer graphene. This simple but powerful method is green, convinient and repeatable, promising its great potential applications for graphene or other two-dimensional materials.
Graphene has unique water wetting properties, which has drawn great research interests recently. On the other side, water condensation and evaporation is a natural phenomenon in our daily life. By combining these, we develop a facile optical visualization approach for graphene on a variety of substrates simply with the assistance of water vapor. We show that graphene is visible when it is not fully transparent to wetting for the underlying substrates. The different wetting behavior of graphene-covered and uncovered surface leads to the difference in the distribution and morphology of water droplets, also gives rise to the interesting confining wall effect of the graphene edge, contributing to the observation of graphene. Moreover, this approach also enables the distinguishing of monolayer and non-monolayer graphene. This simple but powerful method is green, convinient and repeatable, promising its great potential applications for graphene or other two-dimensional materials.
引文
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[2]Shih C.J.;Wang Q.H.;Lin S.;Park K.C.Phys.Rev.Lett.2012,109,176101.
[2]Shih C.J.;Wang Q.H.;Lin S.;Park K.C.Phys.Rev.Lett.2012,109,176101.