Fundamental understanding of chemistry confined to nanospace remains a challenge since molecules encapsulated in confined microenvironments are difficult to be characterized. Here, we show that CO adsorption on Pt(111) confined under monolayer hexagonal boron nitride (h-BN) can be dynamically imaged using near ambient pressure scanning tunneling microscope (NAP-STM) and thanks to tunneling transparency of the top h-BN layer. The observed CO superstructures on Pt(111) in different CO atmospheres allow to derive surface coverages of CO adlayers, which are higher in the confined nanospace between h-BN and Pt(111) than those on the open Pt surface under the same conditions. Dynamic NAP-STM imaging data together with theoretical calculations confirm confinement-induced molecule enrichment effect within the 2D nanospace, which reveals new chemistry aroused by the confined nanoreactor.

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对局限在纳米空间的化学原理的基本理解仍然是一个挑战，因为封装在局限性微环境中的分子难以表征。在这里，我们表明可以使用近环境压力扫描隧道显微镜（NAP-STM）动态成像单层六方氮化硼（h-BN）下局限在Pt（111）上的CO，这要归功于顶部h-BN的隧道透明性层。在不同CO气氛中在Pt（111）上观察到的CO超结构允许推导CO附加层的表面覆盖率，该覆盖层在相同条件下在h-BN和Pt（111）之间的受限纳米空间中比在敞开的Pt表面上更高。动态NAP-STM成像数据与理论计算一起证实了2D纳米空间内的约束诱导的分子富集效应，

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