A metallic nanoparticle composition dispenser includes a piston-cylinder assembly and a capillary tube. The piston-cylinder assembly includes a cylinder, a pneumatic port at first end of the cylinder, an outlet port at a second end of the cylinder opposite the first end, and a piston movable in the cylinder between the first end and the second end. The capillary tube has a tube inlet and a tube outlet, with the tube inlet being coupled to the outlet port of the cylinder. A metallic nanoparticle composition is contained in the cylinder. The metallic nanoparticle composition dispenser is configured such that the metallic nanoparticle composition is extruded by the piston through the capillary tube under pneumatic actuation by a regulated pneumatic system coupled to the pneumatic port.

Aspects of the disclosure relate to a method of forming an article including: combining first and second chemical components that are reactive with each other to form a coreactive composition; depositing the coreactive composition to form a conductive portion of an article; wherein, 48 hours after depositing, the conductive portion comprises: a tensile modulus of at least 5 MPa; and an electrical conductivity of at least 2 S/m; wherein the coreactive composition comprising: a solvent content less than 5 wt %; and a conductive filler content effective for the conductive portion to reach the electrical conductivity of at least 2 S/m.