Fig. 3: Detection of hot electrons generated on CeOx/Pt nanodiodes.
a Scheme of CeOx/Pt film/TiO2 Schottky nanodiodes that can detect the hot electron flux from methanol oxidation reaction (MOR). MOR strongly occurs at the CeOx-Pt interface producing the methyl formate and CO2 gas. b Energy band diagram of the Schottky nanodiode. Hot electrons from exothermic MOR at CeOx-Pt interface can be detected as steady-state current signals when the hot electrons with excess energy overcome the Schottky barrier height. c Schottky barrier height of fabricated nanodiodes with independently modulated CeOx nanowire arrays. The inset figure shows current-voltage curves of Pt-TiO2. The red line means the curve that was calculated by the thermionic emission equation. d Current density difference between under MOR (a mixture of methanol 4 Torr and oxygen 756 Torr) and under non-reactive condition (oxygen 760 Torr) according to temperature.
