Patent ID: 6797187
Filing Date: 2004-09-28
Classification: B01J,B01L,G01N

Abstract:
A method for forming a fluid-flow channel on a substrate, comprising steps for:(a) depositing a first layer of silicon nitride on the substrate; (b) depositing at least one layer of a sacrificial material over the first layer of silicon nitride, and patterning the sacrificial material to define a nonuniform shape for the channel, with the nonuniform shape including a constricted portion of the channel which has a height that is smaller than the height of the remainder of the channel; (c) depositing a second layer of silicon nitride over the patterned sacrificial material, with the second layer of silicon nitride conforming to the nonuniform shape of the channel; (d) forming a plurality of vertically-disposed electrical conductors spaced along the length of the constricted portion; and (e) removing the sacrificial material from the channel.