Here are a few companies which sell adhesives which conduct electricity

3M {Electrically Conductive Adhesive Films}

Cookson Electronics {Electrically Conductive Adhesives, Electronic Polymers}

Dow Corning Effective Shielding Company {Conductive Adhesives; Silver Glass, Silver Copper, Silver Aluminum, Nickel Coated Graphite, Pure Silver}

Ja-Bar Silicone Corp. {Conductive Adhesives}