Metal oxide hierarchical heterostructures(HHSs)for gas sensors with controllable and novel nanostructures have attracted tremendous attention due to their multi-junction,multi-phase,interfacial and synergic effects.Ba...Metal oxide hierarchical heterostructures(HHSs)for gas sensors with controllable and novel nanostructures have attracted tremendous attention due to their multi-junction,multi-phase,interfacial and synergic effects.Based on various metal oxide materials,multifarious hierarchical nanostructures and heterostructures can be constructed to enhance the sensor performances of the primary structures.Herein,SnO_(2)/ZnO HHSs are successfully prepared via a fast,simple,and low-cost microwave-assisted hydrothermal(MWAH)approach.The epitaxial growth of SnO_(2) nanorods on ZnO nanoflowers formed hierarchical structures that are conducive to promoting sensor performance.The detection limit is 2 ppb for NO_(2) based on the SnO_(2)/ZnO HHSs.The sensor response toward 10 ppm NO_(2) is 52.3,which is 5 and 10 times higher than those of SnO_(2) and ZnO.The response and recovery times of SnO_(2)/ZnO HHSs are 16 and 10 s,respectively.We believe that the strategy of synthesizing metal oxides with HHSs based on the MWAH method provides novel insight into the next generation of gas sensors.展开更多
基金support from the National Natural Science Foundation of China(grants 61701402,61804125 and 61974120)the Key Program for International Science and Technology Cooperation Project of Shaanxi Province(grants 2018KWZ-08 and 2019KW-029)+6 种基金the Fundamental Research Funds for the Central Universities(3102019PY004)the Natural Science Foundation of Shaanxi Province(grants 2017JM5135 and 2018JM6046)the Foundation of the Education Department of Shaanxi Province(grants 18JK0772 and 18JK0780)the Northwest University Doctorate Dissertation of Excellence Funds(grant YYB17020)the Singapore National Research Foundation under NRF Award(no.NRF-RF2013-08)MOE under AcRF Tier 2(MOE2016-T2-1-131)MOE under AcRF Tier 3(MOE2018-T3-1-002).
文摘Metal oxide hierarchical heterostructures(HHSs)for gas sensors with controllable and novel nanostructures have attracted tremendous attention due to their multi-junction,multi-phase,interfacial and synergic effects.Based on various metal oxide materials,multifarious hierarchical nanostructures and heterostructures can be constructed to enhance the sensor performances of the primary structures.Herein,SnO_(2)/ZnO HHSs are successfully prepared via a fast,simple,and low-cost microwave-assisted hydrothermal(MWAH)approach.The epitaxial growth of SnO_(2) nanorods on ZnO nanoflowers formed hierarchical structures that are conducive to promoting sensor performance.The detection limit is 2 ppb for NO_(2) based on the SnO_(2)/ZnO HHSs.The sensor response toward 10 ppm NO_(2) is 52.3,which is 5 and 10 times higher than those of SnO_(2) and ZnO.The response and recovery times of SnO_(2)/ZnO HHSs are 16 and 10 s,respectively.We believe that the strategy of synthesizing metal oxides with HHSs based on the MWAH method provides novel insight into the next generation of gas sensors.
