Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (1): 183-194.doi: 10.3866/PKU.WHXB201512113

• REVIEW • Previous Articles     Next Articles

STM Study of CaO(001) Model Catalytic Thin Films Prepared on Mo(001) Surface

Li WANG1,Hong SHI1,Hui-Hui LIU1,Xiang SHAO1,*(),Kai WU2,*()   

  1. 1 STM Study of CaO(001) Model Catalytic Thin Films Prepared on Mo(001) Surface
    2 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2015-10-15 Published:2016-01-13
  • Contact: Xiang SHAO,Kai WU;
  • Supported by:
    the National Natural Science Foundation of China(21333001);National Key Basic Research Program of China (973)(2014CB932700);Thousand Talent Program for Young Outstanding Scientists of the Chinese Government


Single crystalline oxide thin film has been delegated as an important approach to studying oxide materials. The related researches are at the frontier of model catalysis. In this review, we try to summarize what has been researched so far around the CaO(001) films, which have been recently developed in Prof. Hajo Freund′s group at the Fritz-Haber Institute. The revealed properties of CaO films have displayed the common characteristics of supported ultrathin oxide films, which are sensitively dependent on the interface structures and film thicknesses, but they have also shown new aspects such as the novel tuning effects from self-doping by substrate ions. Low-temperature scanning tunneling microscopy (LT-STM) has been applied through all detailed studies, including the characterizations of atomic structure and electronic properties, recognition of various defects and charge analyses of various surface species. The microscopic information received from delicate STM measurements provides atomic views of the effective factors involved in manipulating the oxide surface properties. With the aid of theoretical calculations, deep insights of the doping mechanism and selection principles of the dopants are achieved, which should largely assist the design of new catalysts.

Key words: CaO, Thin film, Model catalyst, STM, Surface chemistry


  • O647