Gas flow through atomic-scale apertures
Gas flow through atomic-scale apertures
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DOI：
10.1126/sciadv.abc7927
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发表时间：
2020-12-01
期刊：
影响因子：
13.6
通讯作者：
Radha, Boya
中科院分区：
文献类型：
--
作者：
Thiruraman, Jothi Priyanka;Dar, Sidra Abbas;Radha, Boya
气体流动通常用一个多世纪前形成的理论描述来分析，并且不断受到新兴的狭窄通道、狭缝和孔隙结构的挑战。在此，我们报道了二维（2D）材料中的原子尺度缺陷可作为气体在最终准零维原子极限下流动的孔隙。我们证实原始的单层二硫化钨（WS₂）膜可作为气体传输的原子级薄屏障。通过聚焦离子束辐照在独立的（WS₂）单层中制造出因钨（W）位点缺失而产生的原子空位，并使用像差校正的透射电子显微镜对其进行表征。具有原子孔隙的WS₂单层具有机械稳定性，并显示出快速的氦气流动。我们提出了一种简单而可靠的方法，利用气体流动来确认大面积原子孔隙的形成，这是探索其在包括分子分离、单量子发射器、超低浓度气体的传感和监测等各个领域的潜在应用的关键步骤。
Gas flows are often analyzed with the theoretical descriptions formulated over a century ago and constantly challenged by the emerging architectures of narrow channels, slits, and apertures. Here, we report atomic-scale defects in two-dimensional (2D) materials as apertures for gas flows at the ultimate quasi-OD atomic limit. We establish that pristine monolayer tungsten disulfide (WS2) membranes act as atomically thin barriers to gas transport. Atomic vacancies from missing tungsten (W) sites are made in freestanding (WS2) monolayers by focused ion beam irradiation and characterized using aberration-corrected transmission electron microscopy. WS2 monolayers with atomic apertures are mechanically sturdy and showed fast helium flow. We propose a simple yet robust method for confirming the formation of atomic apertures over large areas using gas flows, an essential step for pursuing their prospective applications in various domains including molecular separation, single quantum emitters, sensing and monitoring of gases at ultralow concentrations.