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(A) Image showing a microdrone equipped with a Ni-Pd–based H2-sensitive CS-FET (top) and an unassembled drone showing the individual components (bottom). DAQ, data acquisition. (B) Image depicting the experimental setup used for the aerial hydrogen sensing experiment. (C and D) Image capture of the CS-FET–equipped microdrone in motion at different times with corresponding altimetry and generated H2 sensor response, respectively.
