Collect. Czech. Chem. Commun. 1991, 56, 104-111

In situ observation using a scanning tunneling microscope of a local morphological light-induced transformation of n-molybdenumdisulfide in contact with acetonitrile containing a small amount of water

Kenji Sakamaki*, Kohichiroh Hinokuma and Akira Fujishima

Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113, Japan


A scanning tunneling microscope (STM) under photoelectrochemical control was used to expand the understanding of nanometer scale in situ photoelectrochemical processes at an n-MoS2/acetonitrile interface. A local morphological light-induced transformation occurred around a MoS2(0001) surface depression. This morphological transformation was attributed to the n-MoS2 photoelectrochemical reaction which was controlled by a small amount of water contained in the acetonitrile. After visible light illumination (276 s), photoelectrochemical reactions under anodic polarization transformed the original depression into a "right-angled triangular" type depression.