Cosima N Boswell

Publications (2)17.04 Total impact

• Source

  Available from: Johnny C Ho

  Article: Nanoscale structural engineering via phase segregation: Au-Ge system.

  Yu-Lun Chueh, Cosima N Boswell, Chun-Wei Yuan, Swanee J Shin, Kuniharu Takei, Johnny C Ho, Hyunhyub Ko, Zhiyong Fan, E E Haller, D C Chrzan, Ali Javey
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  ABSTRACT: A tunable structural engineering of nanowires based on template-assisted alloying and phase segregation processes is demonstrated. The Au-Ge system, which has a low eutectic temperature and negligible solid solubility (<10(-3) atom %) of Au in Ge at low temperatures, is utilized. Depending on the Au concentration of the initial nanowires, final structures ranging from nearly periodic nanodisk patterns to core/shell and fully alloyed nanowires are produced. The formation mechanisms are discussed in detail and characterized by in situ transmission electron microscopy and energy-dispersive spectrometry analyses. Electrical measurements illustrate the metallic and semiconducting characteristics of the fully alloyed and alternating Au/Ge nanodisk structures, respectively.
  Nano Letters 02/2010; 10(2):393-7. · 13.20 Impact Factor
• Article: Processing route for size distribution narrowing of ion beam synthesized nanoclusters

  C. W. Yuan, Cosima N. Boswell, S. J. Shin, C. Y. Liao, J. Guzman, J. W. Ager, E. E. Haller, D. C. Chrzan
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  ABSTRACT: Ion beam synthesis of nanocrystals is explored using a recently developed kinetic Monte Carlo model for the process. The model suggests that temperature can be used to engineer nanocrystal size distributions. Specifically, by initiating implants at low temperature and then ramping the temperature upward, one can both tune the average size of the nanocrystals and restrict size distribution widths to less than 20% of the average size.
  Applied Physics Letters 09/2009; · 3.84 Impact Factor