Neuro-chemical sensor with inhibition of fouling on nano-electrode
A biosensor includes an array of metal nanorods formed on a substrate. An electropolymerized conductor is formed over tops of a portion of the nanorods to form a reservoir between the electropolymerized conductor and the substrate. The electropolymerized conductor includes pores that open and close responsively to electrical signals applied to the nanorods. A dispensing material is loaded in the reservoir to be dispersed in accordance with open pores.
1. A method for fabricating a biosensor, comprising:
forming nanorods on a metal layer;
forming a conformal layer over the nanorods formed on the metal layer;
recessing the conformal layer on at least a portion of the nanorods to expose tops of the nanorods;
electropolymerizing a conductor on the tops of the nanorods exposed by the recessing to form a reservoir between the conductor and the metal layer, the conductor including pores that open and close responsively to electrical signals applied to the nanorods; and
loading a dispensing material to be dispersed in the reservoir in accordance with open pores.
2. The method as recited in claim 1 , further comprising closing the pores after loading the dispensing material in the reservoir for in vivo operation.
3. The method as recited in claim 2 , wherein the pores can be opened to dispense the dispensing material for the in vivo operation.
4. The method as recited in claim 1 , wherein the electrical signals can be pulsed to control an amount of dispensing material released.
5. The method as recited in claim 1 , wherein the dispensing material includes a cell growth inhibitor or a cell growth promoter.
6. The method as recited in claim 1 , wherein the conductor includes polypyrrole.
7. The method as recited in claim 1 , wherein the nanorods are grouped into a first region and a second region where the first region includes the conductor and the dispensing material, and a second region includes a sensing region.
8. The method as recited in claim 7 , wherein the first region inhibits biofouling in at least the first region.
9. The method as recited in claim 7 , wherein the first region inhibits biofouling in the first region and the second region.
10. The method as recited in claim 1 , wherein the dispensing material can be dispersed two or more times.