Magnetic-field-assisted assembly of metal/polymer/metal junction sensors

Zhang, Haiqian; Boussaad, Salah; Ly, Nguyen; Tao, Nongjian J.
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p133
Academic Journal
We present a method to assemble Au/polyaniline/Au junctions and demonstrate a chemical sensor application. The building blocks consist of an array of microelectrodes on a silicon chip, microfabricated metallic bars, and a thin polyaniline layer deposited on the microelectrodes or on the bars. The individual bars suspended in solution are placed, with the help of a magnetic field, across the microelectrodes to form the junctions. The polyaniline layer is ∼30 nm thick and modified with glycine-glycine-histidine oligopeptides. Strong binding of Cu[sup 2+] to the oligopeptide is converted into a conductance change of the junctions, allowing selective detection of trace amounts of Cu[sup +2] ions. © 2004 American Institute of Physics.


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