biostudies-literatureUnknown9(4)Yin GThe development of heterojunction structures has been considered as an important step for sensing materials. In this report, 3D hierarchical SnO-SnO₂ heterojunction structures were synthesized and developed <i>via</i> simple one-pot hydrothermal synthesis without any extra processes. The prepared 3D samples exhibit high sensitivity, benefiting from the synergistic effects of SnO and SnO₂. Interestingly, SnO-SnO₂ hybrid structures exhibited distinctly different sensitivities at 180 and 280 °C, and the sensitivity can achieve values of 47.69 and 41.56 toward ethanol and acetone, respectively, at concentrations of 100 ppm. A mechanistic analysis of the sensitivity and concentration-dependence revealed that the oxygen species on the surface were O^- aRSC advances1903-1908https://www.ebi.ac.uk/biostudies/studies/S-EPMC9059712biostudies-literatureEnhanced gas selectivity induced by surface active oxygen in SnO/SnO₂ heterojunction structures at different temperatures.PMC9059712Xu LZhang FYin GPeng FHe DLu JYu WGe MChen XLuo CSun YSun JfalseEnhanced gas selectivity induced by surface active oxygen in SnO/SnO₂ heterojunction structures at different temperatures.The development of heterojunction structures has been considered as an important step for sensing materials. In this report, 3D hierarchical SnO-SnO₂ heterojunction structures were synthesized and developed <i>via</i> simple one-pot hydrothermal synthesis without any extra processes. The prepared 3D samples exhibit high sensitivity, benefiting from the synergistic effects of SnO and SnO₂. Interestingly, SnO-SnO₂ hybrid structures exhibited distinctly different sensitivities at 180 and 280 °C, and the sensitivity can achieve values of 47.69 and 41.56 toward ethanol and acetone, respectively, at concentrations of 100 ppm. A mechanistic analysis of the sensitivity and concentration-dependence revealed that the oxygen species on the surface were O^- a2019-01-01T00:00:00Z2019 Jan2025-04-04T20:22:04.185Z2025-04-04T20:22:04.185ZS-EPMC90597123551611610.1039/c8ra09965k