Where, k is a device parameter, a; is the thermal expansion coefficient, t is the thickness of the two layers, Xj is the thermal conductivity of the two layers, l and ro are the length and width of the cantilever, and P is the total power on the sensor. A thin silicon cantilever coated with a 0.4 p.m aluminium layer has a sensitivity in the picojoule range. Thus, the cantilever can be used as a very small and sensitive power meter. This bimetallic effect can also be observed if there is a reaction (such as the phase transition of a deposited layer of material or a catalytic reaction on the surface of a cantilever with gas physical adsorption) on only one side of the cantilever. These reactions will then involve a miniscule amount of solid material (picoliter).
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