Conductive principle of graphite paper Why can graphite paper conduct electricity?

Carbon is a tetravalent atom. On the one hand, just as electrons in the outermost layer of metal atoms are easily lost, there are fewer electrons in the outermost layer of carbon, much like metals, so it has certain conductivity.

When pentavalent phosphorus and trivalent boron penetrate into it, corresponding free electrons and holes will be generated. In addition, the outer electrons easily lost by carbon will move and fill holes under the action of potential difference. Produce an electron flow. This is the principle of semiconductors.