Vacuum-Free Liquid-Metal-Printed 2D Semiconducting Tin Dioxide: The Effect of Annealing

Surface chemistry altering electronic behaviour of liquid metal-derived tin oxide nanosheets

“…The SnO 2 nanosheet-based transistor exhibited exceptional electronic performance, attributed to fast electron mobility and high conductivity of LM-derived 2D SnO 2 . 23 The output curves (I DS vs. V DS ) and transfer curves (I DS vs. V GS ) plotted in Fig. 2(b), respectively, confirmed the n-type semiconducting behaviour of SnO 2 nanosheets 48 with electron mobility μ e of 2.2 cm 2 V −1 s −1 .…”

“…19 The resulting 2D SnO 2 is composed of covalent bonds at all dimensions and abundant unstratified dangling bonds on the surface, offering active sites for interfacial interactions. Although the current LM processes have been proven effective in creating 2D SnO 2 with superior properties for gas sensing and electronics, 19,[23][24][25] understanding the interfacial chemistry of as-produced SnO 2 is limited. In particular, the influence of intrinsic electronic properties of produced 2D SnO 2 by surface chemistry remains unexplored.…”

Plasmonic Gold Nanoparticle-Decorated Ultrathin SnO2 Nanosheets with Superior Ultraviolet and Visible Photoresponsivity

“…The touch printing technique enables the deposition of continuous nanosheets across a large lateral plane exceeding 1 cm 2 area (Figure S1) and results in highly reproducible tin oxide nanosheets with an average thickness of ∼1.9 nm (Figure S2a). It has, however, been reported that the liquid metal-derived SnO x consists of both tin monoxide (SnO) and tin dioxide (SnO 2 ) under ambient conditions. − Hence, the 2D SnO x nanosheets were subjected to post-thermal annealing at 450 °C for 15 min in ambient air to promote the formation of the SnO 2 phase, a process that is validated via various characterization methods (Figure S2).…”