Study On The Three Dimensional Macroporous Semiconductor Metal Oxide Composites And Its Sensing Properties

Nowadays,sensors play an irreplaceable role in many aspects in our life and industry production.With the rapidly increase of people's needs and requirements,develop new,effective,and inexpensive sensors is particularly important.Among different kinds of sensors,semiconductor metal oxide with low price,simple preparation method,stable physical and chemical properties,and high sensitivity has become the research hotspot in the sensing field.At the same time,the rapid development of nanotechnology has provided a new direction for the exploration of high-performance sensors.Nanomaterials with various structures have attracted more and more attention.As a special nanostructure,three dimensional inverse opal?3DIO?has been widely studied.It can provide a large number of active sites and unique porous properties which is conducive to electron migration.In this paper,different 3DIO structures of semiconductor metal oxide were studied,and different strategies?such as synthesis method,doping,and introducing of metal organic framework?MOF??were used to further improve the performance of its sensing properties,then the proposed materials were successfully applied to the electrochemical sensor and gas sensor.The main results are as follows:?1?The design and preparation of high-performance biosensors that can accurately monitor the release of trace hydrogen peroxide?H₂O₂?by cells is an important means for the study of cellular metabolic abnormalities.In order to achieve the non-enzymatic high efficiency detection of H₂O₂ in cells,we prepared a series of 3DIO CuO composite nanomaterials coated with NiO nanosheets and Au nanoparticles.Under optimal conditions,the prepared sensing electrodes exhibited high sensitivity(650.2?A mM^-1 cm^-2?20 nM²0?M??432.7?A mM^-1 cm^-2?21?M² mM?in PBS environment)and low detection limits?2.1 nM and 3.7 nM,S/N=3,in the NaOH and PBS environments,respectively?.?2?A 3DIO ZnO gas sensor modified by Pt NPs was designed.The strategy of different concentrations of Pt nanoparticles coated with MOF added into the precursor of 3DIO ZnO was adopted to obtain 3DIO Pt@ZnO-ZnO nanomaterials.Due to the long-range ordered macroporous structure and high dispersion of Pt NPs,the 3DIO Pt@ZnO-ZnO sensor exhibited excellent sensitivity,long-term stability and good selectivity for H₂S gas.In addition,under the condition of ensuring high performance,the strategy of preparing ZIF-8 with Pt NPs improves the dispersion of Pt NPs,reducing the cost of introducing noble metals and providing a new direction for the preparation of lower cost H₂S sensor.In summary,we improved the performance of the sensor by different methods based on different 3DIO nanomaterials,realized the electrochemical sensing of trace H₂O₂ released by cells and the detection of H₂S,which has reference significance for some research.