Synthesis of polyacrylamide hydrogels as p–n‐junction with ionic charge carriers

Abstract

Three different designs for p–n junctions were formed with p‐and n‐type polyacrylamide hydrogels (PAAm) doped with positive (Na+) and negative (Br−) ions as charge carriers. First, previously synthesized p‐and n‐type gels in slab forms were contacted physically with together. Second, having synthesized p‐type gel, n‐type pregel solution was poured onto p‐type slab gel for synthesis. Thus, p‐and n‐type gels were synthesized as to be contacted chemically together. Third, first p‐type and n‐type pregel solutions were mixed together, then the mixing was poured into a pot to form a layer, and then the reaction was performed under an electric field for directing the dopants on the opposite sides. The rectification efficiencies of all these junctions were discussed in detail. POLYM. ENG. SCI., 54:2799–2805, 2014. © 2013 Society of Plastics Engineers

Polyacrylamide hydrogel as an electrolyte for oxidation-based organic rectifiers

“…The conductivity of the hydrogels can be increased by doping with metal particles or salt molecules. If the hydrogels were doped with some salt molecules, the charge carriers would be the counter ions of these doped molecules in addition to H + and OH − ions.…”