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kanl331

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Hot filament and microwave plasma CVD micro- nanocrystalline diamond films are analysed by visible and ultra-violet excitation source Raman spectroscopy. The sample grain size varies from 20 nm to 2 ¦Ìm. The hydrogen concentration in samples is measured by SIMS and compared to the grain size, and to the ratio of sp2 carbon bonds determined by Raman spectroscopy from the 1332 cm−1 diamond peak and the sp2 1550 cm−1 G band. Hydrogen concentration appears to be proportional to the sp2 bonds ratio. The 3000 cm−1 CHx stretching mode band intensity observed on the Raman spectra is decreasing with the G band intensity. Thermal annealing modifies the sp2 phase structure and concentration, as hydrogen outdiffuses.

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kanl331(½ð±Ò+50, ·­ÒëEPI+1): »¶Ó­Äã¶à¶àÖ¸µã 3q 2011-06-01 10:02:43
Hot filament and microwave plasma CVD micro- nanocrystalline diamond films are analysed by visible and ultra-violet excitation source Raman spectroscopy. Hot filament and microwave plasma CVD ΢ÄÉÃ×¾§Ìå½ð¸ÕʯĤÒԿɼûºÍ×ÏÍ⼤·¢¹âÔ´À­Âü¹ãÆ×·¨¼ÓÒÔ·ÖÎö¡£The sample grain size varies from 20 nm to 2 ¦Ìm.ÑùÆ·¾§Á£´óСΪ20nmµ½2¦Ìm²»µÈ¡£ The hydrogen concentration in samples is measured by SIMS and compared to the grain size, and to the ratio of sp2 carbon bonds determined by Raman spectroscopy from the 1332 cm−1 diamond peak and the sp2 1550 cm−1 G band. ÑùÆ·ÖÐÇâµÄŨ¶ÈÒÔSIMS²âÁ¿²¢ºÍ¾§Á£³ß´çÒÔ¼°ÓÉÀ­Âü¹âÆ×²âµÃµÄ1332 cm−1½ð¸Õʯ·åµÄsp2̼´øºÍ1550cm-1µÄG´øsp2Ö®±ÈÏà±È½Ï¡£Hydrogen concentration appears to be proportional to the sp2 bonds ratio. ÇâŨ¶ÈºÃÏñÊÇÓësp2Æ×´ø±È³É±ÈÀý¡£The 3000 cm−1 CHx stretching mode band intensity observed on the Raman spectra is decreasing with the G band intensity. ÔÚÀ­Âü¹âÆ×ÉϹ۲⵽£¬3000cm-1µÄCHxÉìչģʽÆ×´øµÄÇ¿¶ÈËæG´øÇ¿¶ÈÔö¼Ó¶ø¼õС¡£Thermal annealing modifies the sp2 phase structure and concentration, as hydrogen outdiffuses.ÈÈ´¦Àíʱ£¬ÇâÏòÍâÀ©É¢£¬sp2ÏàµÄ½á¹¹ºÍŨ¶È±»Ð޸ġ£

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