Microcrystals of metallic copper were electrochemically deposited onto the surface of porous silicon films in the aqueous electrolyte of copper(II) chloride.

以氯化铜水溶液作电解液，在发光多孔硅薄膜表面上电沉积铜。

youdao

It used to be that we got all of our copper either from the very small deposits of pure metallic copper or from the larger deposits of copper sulfides.

FORBES: Peak Copper: Worldwatch Institute Gets It Wrong Again

Then a coat is applied of yttrium, barium and copper, the metallic elements of YBCO, today's HTS recipe of choice, along with impurities just nanometres (billionths of a metre) across.

ECONOMIST: Inside story

Miners can use underwater robots to dig up deposits left from "black smokers, " which are little towers of metallic sulfides that form after magma forces fluids with copper, gold and other metals through the seafloor.

WSJ: Exhausting the Earth's Resources? Not So Fast