US Patent 7562562 Method and device for detecting a material

A method and device is provided for detecting a predetermined material. The device includes a first inner layer having first and second surfaces and a volume responsive to a first predetermined stimuli. A second inner layer has first and second surfaces. An adhesive bonds at least a portion of the first surface of the first inner layer to the first surface of the second inner layer with a bonding force. A change in the volume of the first layer generates an elastic force on the adhesive material. As a result, the first inner layer delaminates from the second inner layer in response to the elastic force overcoming the bonding force.