Singh, R. Arvind Yoon, Eui-Sung Han, Hung-Gu Kong, Hosung 2024-01-21T01:34:58Z 2024-01-21T01:34:58Z 2021-09-05 2007-01-04 0043-1648 https://pubs.kist.re.kr/handle/201004/134748 Friction characteristics of self-assembled monolayers (SAMs) coated on Si-wafer (100) by chemical vapor deposition technique were studied experimentally at nano and micro-scales. Four self-assembled monolayers, such as dimethyldichlorosilane (DMDC), diphenyldichlorosilane (DPDC), perfluorooctyltrichlorosilane (PFOTS) and perfluorodecanoicacid (PFDA) coated on Si-wafer (100) were used as test materials. Nanoscale friction was measured using atomic force microscopy (AFM) in the range of 0-40 nN normal loads, in LFM (lateral force microscopy) mode, using a contact mode type Si3N4 tip. Results showed that the friction of SAMs at this scale was influenced by their physical/chemical properties, while that of Si-wafer by its inherent adhesion. Further, micro-scale friction tests were also performed with a ball-on-flat type micro-tribotester under reciprocating motion. Friction was measured in the range of 1500-4800 mu N applied normal loads using glass balls of varying radii, viz., 0.25, 0.5 and 1 turn. It was observed that the performance of SAMs was more superior to Si-wafer even at micro-scale, except for PFDA. Evidences obtained using scanning electron microscope showed that Si-wafer and PFDA exhibited wear at this scale. Wear in the case of Si-wafer was due to solid-solid adhesion and that in the case of PFDA due to the influence of humidity (moisture). The micro-scale friction in both these materials was severely influenced by their wear. (c) 2006 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA ANTI-STICTION COATINGS FORCE MICROSCOPY CH3-TERMINATED FILMS ATOMIC-FORCE WEAR MEMS OCTADECYLTRICHLOROSILANE SYSTEMS DEVICES CF3 Friction behaviour of chemical vapor deposited self-assembled monolayers on silicon wafer Article 10.1016/j.wear.2006.04.001 1 WEAR, v.262, no.1-2, pp.130 - 137 WEAR 262 1-2 130 137 scie scopus 000242879900014 2-s2.0-33750975879 Engineering, Mechanical Materials Science, Multidisciplinary Engineering Materials Science Article ANTI-STICTION COATINGS FORCE MICROSCOPY CH3-TERMINATED FILMS ATOMIC-FORCE WEAR MEMS OCTADECYLTRICHLOROSILANE SYSTEMS DEVICES CF3 nano micro friction wear tribology AFM SAM