|発明の名称||PREPARATION METHOD OF MIXED SAM|
PROBLEM TO BE SOLVED: To provide a preparation method of a mixed SAM, capable of forming at least two different SAM constituent molecules on a substrate in a desired ratio to hold the desired ratio to a stable state, a sensor chip having the mixed SAM, and its manufacturing method.
SOLUTION: The preparation method of the mixed SAM for forming the mixed SAM in a multistage fashion includes: the step for bringing the surface of the substrate into contact with a mixed liquid containing a first polyethylene glycol (PEG) chain having a fixing group at its one terminal and having a first connecting group at its other terminal and fixing the first PEG chain to the surface of the substrate through the fixing group; and the step for bringing the surface of the substrate into contact with a mixed liquid containing at least two second PEG chains having second connecting groups at each one terminal and connecting the second PEG chains to the first PEG chain through the second connecting groups and the first connecting group.
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