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Electron transfer mechanisms of Ni‐CAT‐1‐on‐SLG device. A) Illustration of the KPFM test for Ni‐CAT‐1‐on‐SLG and SLG heterojunction. B) AFM image of the Ni‐CAT‐1‐on‐SLG‐15 nm and SLG heterojunction. C) Corresponding KPFM image of the Ni‐CAT‐1‐on‐SLG‐15 nm and SLG heterojunction. D) Band diagram of Ni‐CAT‐1‐on‐SLG and the electron transfer mechanism during ammonia adsorption.
