Fig. 1: Morphology of ZnO NT-based pressure sensor.
From: Individually addressable and flexible pressure sensor matrixes with ZnO nanotube arrays on graphene

a Top-view and b 30° tilted-view SEM images of ZnO NT arrays on graphene. c SEM images of a single ZnO NT with 30° tilted views. d Top-view and e 30° tilted-view SEM images of ZnO NT-based pressure sensor arrays on graphene. f 30° tilted-view SEM images of a single ZnO NT-based pressure sensor. g TEM image of an individual ZnO NT collected after scratching the ZnO NTs on a Cu grid. h, i Corresponding HRTEM lattice image and SAED pattern, respectively.