Dynamic nanoscale imaging of enriched CO adlayer on Pt(111)confined under h-BN monolayer in ambient pressure atmospheres

Fun dame ntal un derstandi ng of chemistry confined to nano space remains a challe nge since molecules en capsulated in confined microe nviron merits are difficult to be characterized.Here,we show that CO adsorptio n on Pt(111)8nfined un der mono layer hexago nal boron nitride(h-BN)can be dynamically imaged using near ambient pressure seanning 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 8nfined nano space between h-BN and Pt(111)than those on the ope n Pt surface un der the same conditions.Dynamic NAP-STM imaging data together with theoretical calculations confirm confinement-induced molecule enrichment effect within the 2D nano space,which reveals new chemistry aroused by the confined nano reactor.