Microfabrication property modification

Microfabrication techniques can be classified as follows (1) property modification, (2) patterning, (3) subtractive processes and (4) additive processes and packaging [10],... 

MCE devices have been made from a wide variety of materials with greatly varying properties. Selection of an appropriate material is best determined by the specific needs related to detection, cost, available microfabrication facilities, and required separation resolution. In many cases, however, the base material does not provide appropriate chemical properties for the desired application. For this reason, a number of methods for surface modification have been developed to provide chemical control of electrophoresis. 

SECM microfabrication is based on the use of the tip to alter local chemical properties in small (micrometer or submicrometer-sized) domains. Several approaches to surface modification by SECM are outlined in this section. These may be divided roughly into methods in which the tip and substrate are the working electrode and auxiliary electrodes of a cell and methods in which the chemistry of the system is chosen so that the SECM feedback process leads to deposition or... 

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