Abstract

We present atomic-resolution images of TiSe $_2$ , MoTe $_2$ and TaS $_2$ single crystals in liquid condition using our home-built scanning tunneling microscopy (STM). By facilely cleaving of single crystals in liquid, we were able to keep the fresh surface not oxidized within a few hours. Using the high-stable home-built STM, we have obtained atomic resolution images of TiSe $_2$ accompanied with the single atom defects as well as the triangle defects in solution for the first time. Besides, the superstructure of MoTe $_2$ and hexagonal charge-density wave domain structure in nearly commensurate phase of TaS $_2$ were also obtained at room temperature (295 K). Our results provide a more efficient method in investigating the lively surface of transition metal dichalcogenides. Besides, the high stable liquid-phase STM will support the further investigations in liquid-phase catalysis or electrochemistry.

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