Figure 2
From: Interface-Induced Ordering of Gas Molecules Confined in a Small Space
Height images of a HOPG-water interface acquired with PF mode after oxygen-supersaturated water was deposited.
Peak forces of +100 pN (a), +250 pN (b), +650 pN (c), +1250 pN (d) were applied. The peak force was returned to100 pN in (e) and (f). In the region corresponding to the thick pancake-shaped layer, the tip penetrated through the disordered layer to image the underlying ordered base layers, which appeared approximately 0.5 nm lower than the surrounding ordered layers. Ordered structures, comprising two sets of three rotated row-like structures, were observed. One set with the rows oriented along the arm-chair directions is indicated using blue arrows and the second set, which was oriented along the zig-zag directions, is indicated with pink arrows. The outlined region in (f) indicates an area showing formation of new ordered structures.
