w7_SAMS - Nanotribological Properties and Mechanisms of...

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  Nanotribological Properties and Mechanisms of Self-assembled Monolayers Studied by AFM Prof. Bharat Bhushan Nanotribology Laboratory for Information Storage and MEMS/NEMS
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  Outline Introduction Need for lubrication for nanotechnology applications SAMs: The model lubricant for nanotechnology applications Objectives and Approach Experimental Results Hexadecane thiol and biphenyl thiol SAMs on Au (111) Alkylsilane and pefluoroalkylsilane SAMs on Si (100) and alkylphosphonate SAMs on Al Conclusions
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  Need of Lubrication for Nanotechnology Applications The ideal lubricant for nanotechnology applications should have the following attributes: Molecularly thick film Easy to be deposited Well organized Chemically bonded to substrate Insensitive to environment
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  SAMs: The Model Lubricant for Nanotechnology Applications W h a t i s S A M s ? S A M s a r e o r d e r e d m o l e c u l a r a s s e m b l i e s f o r m e d b y c h e m i c a l a d s o r b t i o n o f a n a c t i v e s u r f a c t a n t o n a s o l i d s u b s t r a t e s u r f a c e . S A M s c o n s i s t o f t h r e e b u i l d i n g g r o u p s : H e a d g r o u p : b i n d s s t r o n g l y t o a s u b s t r a t e T a i l g r o u p : c o n s t i t u t e s t h e o u t e r s u r f a c e o f t h e f i l m S p a c e r c h a i n : c o n n e c t e d t o t h e h e a d a n d t a i l g r o u p s . P r e p a r t i o n S A M s c a n b e s p o n t a n e o u s l y f o r m e d b y i m m e r s i o n o f a n a p p r o p r i a t e s u b s t r a t e i n t o a s o l u t i o n o f a n a c t i v e s u r f a c t a n t i n a n o r g a n i c s o l v e n t W h y S A M s ? E a s y t o b e p r e p a r e d o n v a r i o u s s h a p e d d e v i c e s . F l e x a b i l e f o r m o l e c u l a r t a i l o r i n g . W e l l o r g a n i z e d , c h e m i c a l l y b o n d e d t o s u b s t r a t e . S e l f A s s e m b l e d M o n o l a y e r s ( S A M s )
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  Study the nanotribological properties of SAMs with different spacer chains, different backbone structures, different head and tail groups and deposited on different substrates. Understand the relationships between molecular structure and nanotribological performance as well as the molecular scale friction and wear mechanisms Objective
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  Approach Alkylsilanes and perfluoroalkylsilanes are ideal SAMs from tribology point of view
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w7_SAMS - Nanotribological Properties and Mechanisms of...

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