Fig. 13.

a FESEM image of the MoS₂ nanosphere. b Sensor response profile. c Transient resistance profile. Reproduced with permission from Ref. [33]. Copyright (2016) from Elsevier. d FESEM image of the CTAB-assisted MoS₂ sphere. e Gas response obtained at different temperature range. f Time response profile of NO₂ sensing. Reproduced with permission from Ref. [306]. Copyright (2018) from Elsevier. g FESEM image of solid MoS₂ sphere and hollow sphere. h Obtained sensor response for hollow, solid and smooth spheres. i Sensor response at different temperatures. The highest sensor response obtained for the hollow spheres. Reproduced with permission from Ref. [307]. Copyright (2019) from Elsevier