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Nanocrystalline diamond (NCD) films were grown on gold/Al2O3 substrate using microwave plasma‐enhanced chemical vapor deposition (PECVD) process. The NCD morphology was controlled by the deposition time and it was investigated by scanning electron microscopy (SEM). Gas sensing properties of NCD surface conductivity to humid air, CO2, NH3, and COCl2 gases were measured by impedance measurements at room and at high temperature (140 °C). The H‐terminated NCD surface shows a significant response to oxidizing gas (humid air, COCl2) in comparison to reducing gases (CO2, NH3).
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Davydova et al. (2009) studied this question.
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