Fig. 10: Different approaches for regulating the sensing performance of pristine MOSs.
a XRD patterns of TiO2 films synthesized with different ethanol contents. * indicates the diffraction peaks from FTO substrate; b intrinsic resistance of four samples without H2 and the response of four samples to different H2 concentrations; c Response and recovery time of the hydrogen sensors to various H2 concentrations140. Copyright 2018, American Chemical Society. d Schematic of the formation process of SnO2 nanospheres and e, f the sensing performance of four sensors toward H2153. Copyright 2022, Elsevier. g Synthesis process for 2D holey/unholey ZnO NS; h Linearity sensing response of holey/unholey ZnO based sensors to different H2 concentrations and i The response/recovery time of optimized holey ZnO-based sensor toward 100 ppm H2129. Copyright 2021, Elsevier
