(1) Please describe the chemical surface modification method, Self-Assembled Monolayers? (2) Please describe the functions of each of three key regions of Self-assembling molecules as shown in the figure. Surface interactions Strong interactions van der Waals forces Functional head group (e.g., CF3, OH, HC=O) van der Waals forces Assembling structure (e.g., alkyl groups) Attachment group (e.g., COOH, SH, SiH4, PO4) Substrate (e.g., gold, silica, aluminum oxide)