TY - JOUR
T1 - Effect of coadsorption of water and alcohol vapor on the nanowear of silicon
AU - Chen, L.
AU - Yang, Y. J.
AU - He, H. T.
AU - Kim, S. H.
AU - Qian, L. M.
N1 - Funding Information:
The authors are grateful for the financial support from the National Natural Science Foundation of China ( 91323302 , 51375409 , and 51175441 ).
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Using an environment-controlled atomic force microscope, the nanowear of silicon against SiO2 microsphere was investigated under various relative humidity (RH) and ethanol partial pressure (Pa/Psat) conditions. When RH was below 10%, there was no discernable wear of the substrate in any Pa/Psat conditions. However, when RH>10%, although the contact pressure (1.3GPa) was far less than the yield stress of silicon material (7GPa), the occurrence of tribochemical wear was observed on silicon surface without ethanol adsorption. When ethanol vapor was introduced, the wear of silicon was inhibited fully or partially depending on RH. At RH below 50%, there was a critical ethanol partial pressure above which tribochemical reaction was completely suppressed and no wear was generated on silicon surface. At RH above 50%, the wear of silicon could be significantly reduced, but not completely, with the increase of ethanol partial pressure. Upon addition of ethanol vapor, the frictional energy dissipation decreased and the energy barrier for tribochemical reaction could also become larger. These factors could explain the lubrication effect of the adsorbate ethanol layer in humid environment. The RH and ethanol partial pressure conditions for the lubrication of Si/SiO2 sliding pairs were identified, which can be used for optimizing the MEMS operation conditions without failure due to wear.
AB - Using an environment-controlled atomic force microscope, the nanowear of silicon against SiO2 microsphere was investigated under various relative humidity (RH) and ethanol partial pressure (Pa/Psat) conditions. When RH was below 10%, there was no discernable wear of the substrate in any Pa/Psat conditions. However, when RH>10%, although the contact pressure (1.3GPa) was far less than the yield stress of silicon material (7GPa), the occurrence of tribochemical wear was observed on silicon surface without ethanol adsorption. When ethanol vapor was introduced, the wear of silicon was inhibited fully or partially depending on RH. At RH below 50%, there was a critical ethanol partial pressure above which tribochemical reaction was completely suppressed and no wear was generated on silicon surface. At RH above 50%, the wear of silicon could be significantly reduced, but not completely, with the increase of ethanol partial pressure. Upon addition of ethanol vapor, the frictional energy dissipation decreased and the energy barrier for tribochemical reaction could also become larger. These factors could explain the lubrication effect of the adsorbate ethanol layer in humid environment. The RH and ethanol partial pressure conditions for the lubrication of Si/SiO2 sliding pairs were identified, which can be used for optimizing the MEMS operation conditions without failure due to wear.
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U2 - 10.1016/j.wear.2015.02.052
DO - 10.1016/j.wear.2015.02.052
M3 - Article
AN - SCOPUS:84937852530
VL - 332-333
SP - 879
EP - 884
JO - Wear
JF - Wear
SN - 0043-1648
ER -