K.H. Bai

Publications (2)3.84 Total impact

• Article: Ion bombardment effects on ZnO nanowires during plasma treatment

  H.-W. Ra, K. S. Choi, C. W. Ok, S. Y. Jo, K. H. Bai, Y. H. Im
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  ABSTRACT: We present the effects of ion bombardment on ZnO nanowires caused by their exposure to an Ar inductively coupled plasma. The conductivity of the individual ZnO nanowire was increased in up to 3 orders of magnitude due to increase in both carrier concentration and mobility, with a substantial negative shift in the threshold gate voltage also being observed. The drastic changes in the electrical properties were attributed to the decrease in species adsorbed on the surface, as well as to the increase in oxygen vacancies near the surface caused by ion bombardment.
  Applied Physics Letters 07/2008; 93(3):033112-033112-3. · 3.84 Impact Factor
• Article: Effects of surface modification of the individual ZnO nanowire with oxygen plasma treatment

  H.-W. Ra, R. Khan, J.T. Kim, B.R. Kang, K.H. Bai, Y.H. Im
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  ABSTRACT: This study examined the effects of an oxygen plasma treatment on the properties of ZnO nanowires with diameters of 80 nm using a single nanowire field effect transistor. After the oxygen plasma treatment, the carrier concentration and mobility of individual ZnO nanowires decreased with a substantial positive shift in the threshold voltage. The shifting was accounted to the surface modification, resulted to the improved gas sensitivity under hydrogen gas exposure and an enhanced photocurrent response time in ultraviolet illumination. The plausible surface mechanisms responsible for these significant changes after the surface modification were suggested by considering the surface analysis and electrical transport mechanism.
  Materials Letters.