Low-concentration acetone detection is of great importance for acetone sensor in the fields of environmental protection and noninvasive diagnosis.In this work,mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)n-p heterojunctions were...Low-concentration acetone detection is of great importance for acetone sensor in the fields of environmental protection and noninvasive diagnosis.In this work,mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)n-p heterojunctions were constructed for efficient improvement of low-concentration acetone gas sensing.The gas-sensing results indicated that the mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)composites with a significantly large specific surface area exhibited significantlyenhanced acetone gas-sensitive performance compared to pure Fe_(2)O_(3).The Fe_(2)O_(3)/Cr_(2)O_(3)composites demonstrated a high response,good selectivity and excellent stability over200 days to 10 ppm acetone at 220℃.And the theoretical detection limit was calculated to reach 0.285 ppm acetone.A feasible acetone sensing mechanism was proposed through electronic band structure and density functional theory.The improved low-concentration acetone sensing performance was due to the formed mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)n-p heterojunctions with a large specific surface area.The Fe_(2)O_(3)/Cr_(2)O_(3)composites showed excellent acetone gas-sensitive performance,which could be a promising candidate for developing low-concentration acetone sensing devices at low working temperatures.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.62374154 and12374128)the National Key R&D Program of China(Nos.2022YFB3903200 and 2022YFB3903203)
文摘Low-concentration acetone detection is of great importance for acetone sensor in the fields of environmental protection and noninvasive diagnosis.In this work,mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)n-p heterojunctions were constructed for efficient improvement of low-concentration acetone gas sensing.The gas-sensing results indicated that the mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)composites with a significantly large specific surface area exhibited significantlyenhanced acetone gas-sensitive performance compared to pure Fe_(2)O_(3).The Fe_(2)O_(3)/Cr_(2)O_(3)composites demonstrated a high response,good selectivity and excellent stability over200 days to 10 ppm acetone at 220℃.And the theoretical detection limit was calculated to reach 0.285 ppm acetone.A feasible acetone sensing mechanism was proposed through electronic band structure and density functional theory.The improved low-concentration acetone sensing performance was due to the formed mesoporous Fe_(2)O_(3)/Cr_(2)O_(3)n-p heterojunctions with a large specific surface area.The Fe_(2)O_(3)/Cr_(2)O_(3)composites showed excellent acetone gas-sensitive performance,which could be a promising candidate for developing low-concentration acetone sensing devices at low working temperatures.
