Abstract
We report on studies of new gas sensing devices to be used in high humidity environments. Highly thermal-stable, super hydrophobic 2-dimensional (2D) boron nitride nanosheets (BNNSs) functionalized with Pt nanoparticles were prepared and used as an active layer for the prototype. The morphologic surface, crystallographic structures and chemical compositions of the synthesized 2D materials were characterized by using optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM) and atomic force microscope (AFM) and Raman scattering, respectively. The experimental data reveals that high-quality BNNSs were prepared. A pair of Au electrodes were combined with a basic electrical circuit and the 2D sensing material to form high-performance gas sensors for the detection of pollution gases. The present structure is simple and the fabrication is easy and fast, which ensures the creation of a low-cost prototype with harsh (high humidity, high temperature) environment resistance and potential for miniaturization. The responses of the prototype to different target gases with different concentrations were characterized. The influences of the operating temperature and bias voltage effect on sensing performances were also investigated. The fabricated sensors appear to have high selectivity, high sensitivity and fast response to target gases. The sensing mechanism in the present case is attributed to the electron donation from the target gas molecules to the active layer, leading to the change of electrical properties on the surface of BNNS layer.
Highlights
Low concentrations of hazardous gases are difficult to be detected by using common gas sensors.Development of novel materials for the formation of devices optimized for their use for the detection of target gas contaminants while operating in hazardous environments has always been the subject of prime interest
Features that the target gas reacts with agents presented onat the surface, resulting Good in an increase or response at is almost times higher than that operating at room temperature
Even if theoretical estimations predict that the adsorption energies of target gases on the surface of BN cluster is relatively weak, our experiments demonstrated that a boron nitride nanosheets (BNNSs) based gas sensor has excellent performances including quick response time, good response strength, stable baseline and repeatability
Summary
Low concentrations of hazardous gases are difficult to be detected by using common gas sensors. There are no reports related to 2D BNNSs based ultra-sensitivity gas sensing devices that can stand up to high humidity environments. Very recent experiments suggested that the problems above could possibly be solved by using highly ordered 2D nanomaterials It revealed that properties including the wettability and sensing response of 2D materials relies on doping elements, doping concentrations and surface functionalization and highly depends on oriented nanostructures. The focus of the present work is on the synthesis and functionalization of wide bandgap, oriented 2D BNNS materials to achieve a highly stable, highly sensitive material for development of high-performance gas sensor for detection of pollution gases. The clarification of such processes brings important information on how these mechanisms are altered in the presence of high humidity and interfering gas contaminants
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