fig9

Figure 9. Gas-sensing performance and biological application of atomically dispersed Au-sensitized mesoporous SnO₂ toward 3H-2B. (A) Sensor responses of mesoSnO₂ and SnO₂ loaded with 0.3%, 0.6%, and 0.9% atomically dispersed Au, denoted as SnO₂/Au SAs-0.3%, SnO₂/Au SAs-0.6%, and SnO₂/Au SAs-0.9%, respectively, toward 2 ppm 3H-2B at various temperatures; (B) Dynamic response-recovery curve of the SnO₂/Au-SAs-0.6% sensor to 3H-2B; (C) Repeatability performance of SnO₂/Au-SAs-0.6% under eight successive cycles at 50 °C; (D) Concentration-dependent response curves of SnO₂/Au-SAs-0.6% for 3H-2B; (E) Bacterial growth profiles; (F) Sensor responses of SnO₂/Au-SAs-0.6% to bacterial VOCs emitted at 0 h and 16 h; (G) Proposed sensing mechanism involving atomically dispersed Au-mediated adsorption and activation of 3H-2B on mesoporous SnO₂. Reproduced with permission from Ref.^[21]. Copyright 2024, American Chemical Society. mesoSnO₂: Mesoporous SnO₂; MEMS: microelectromechanical systems; 3H-2B: 3-hydroxy-2-butanone; SA: single atom; R_a/R_g: resistance in air/resistance in test gas; CFU: colony-forming unit; VOC: volatile organic compound.