Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Oxygen Chemisorption of NbC(111) Surface Studied by High-Resolution Electron Energy Loss and Ultraviolet Photoelectron Spectroscopy

고분해능 전자에너지손실 및 자외선광전자 분광법을 이용한 NbC(111)면의 산소흡착 연구

  • Hwang, Yeon (Department of Inorganic Materials Engineering, Seoul National University) ;
  • Park, Soon-Ja (Department of Inorganic Materials Engineering, Seoul National University) ;
  • Aizawa, Takashi (National Institute for Research in Inorganic Materials) ;
  • Hayami, Wataru (National Institute for Research in Inorganic Materials) ;
  • Otani, Shigeki (National Institute for Research in Inorganic Materials) ;
  • Ishizawa, Yoshio (National Institute for Research in Inorganic Materials)
  • Published : 1992.08.01
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Abstract

Oxygen adsorption on the single crystal NbC(111) surface was studied by high-resolution electron energy loss and ultraviolet photoelectron spectroscopy. On the NbC(111) surface, oxygen molecules as well as oxygen atoms were adsorbed. Oxygen atoms were located at the 3-fold hollow site of the NbC(111) surface with the frequency of 548c$m^{-1}$. It was found that oxygen molecules had vibrational frequency of 968c$m^{-1}$which was much lower than that of the free oxygen molecule. Also the work function of the NbC(111) surface has increased by adsorption of oxygen molecule. These suggest electron tranfer from the NbC(111) substrate to the 2p${pi}_g$ substrate of the oxygen molecule.

고분해능 전자에너지손실 및 자외선광전자 분광법을 사용하여 단결정 NbC(111)면의 산소횹착을 연구하였다. NbC(111) 표면에는 산소가 원자 및 분자상태로 흡착되었다. 산소원자는 3-fold hollow site에 흡착되며 진동수는 548c$m^{-1}$이었다. 산소분자의 신축진동수는 968c$m^{-1}$로서 기체상태인 산소분자의 진동수보다 크게 낮았으며, 산소분자의 흡착으로 일함수가 증가하였다. 이는 NbC(111) 기판으로부터 산소분자의 2p${pi}_g$ 궤도로 전자가 이동하였음을 보여주는 증거이다.

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