Fig. 4: The SEM images of the HFS under different thermal environments.
From: High temperature heat flux sensor with ITO/In2O3 thermopile for extreme environment sensing
The SEM images of In2O3 electrodes a before annealing, b after annealing, and c after repetitive testing. The SEM images of ITO electrodes d before annealing, e after annealing and f after repetitive testing. The SEM image of the thermal resistance layer after g spraying and h high-temperature testing
