doping

in polymer chemistry
https://doi.org/10.1351/goldbook.DT07204
oxidation or reduction process brought about by a dopant.
Source:
PAC, 2006, 78, 2067. 'Terminology of polymers containing ionizable or ionic groups and of polymers containing ions (IUPAC Recommendations 2006)' on page 2070 (https://doi.org/10.1351/pac200678112067)