Synthesis And Properties Of Boron Nitride Composites Design Groups

In this paper, hexagonal boron nitride nanosheet, boron nitride carbon nanosheetand ZnO-modified BN/BNC composites were prepared through simple methods.Novel hexagonal boron nitride FeB49composited nanosheets containing FeB49nanoparticles have been synthesized via a simple chemical vapor deposition method at1200-1400℃. The sample synthesized at1350℃, which contains12layers of h-BNsheet doped FeB49nanoparticles of5-8nm, has a lot of defects. TEM images show thatthe FeB49nanoparticles can be observed on the hexagonal boron nitride FeB49composited nanosheets, but the novel hexagonal boron nitride nanosheets can be tunedto different structure by adjusting reaction temperature and other chemical reactionparameters. A strong photoluminescence emission from the as-prepared nanosheetsreveals in the visible range, displaying strong visible lasing behavior at roomtemperature. The luminescence response indicates that the novel hexagonal boronnitride FeB49composited nanosheets could be used as compact light emitters at visiblewavelengths.The BNC nanosheets have been synthesized though the chemical vapor deposition(CVD) method. And different structure of the BNC nanosheets has been synthesized bycontrolling the different temperature and mass ratio. Detailed electron microscopystudied the morphologies of the samples. The photoluminescence (PL) spectrum showsthat the as-prepared products with special structures have strong emissions.A novel ZnO-modified BN/BNC composite has been synthesized via a simpleprocess, and further characterized by XRD, IR and TEM. The results showed that thesynthesized composite had more defects and sulfate radical, where the ZnOnanoparticles had been successfully embedded on the nanosheet with the gooddispersion size of5-10nm. It has been found that the unique structure of the compositeprovided more active sites for the adsorption of gaseous molecules. This wasattributable to the chemical functionalization on the surface of the BN/BNC nanosheetsand the increased surface-to-volume ratio of the samples. Compared with the bareBN/BNC nanosheets and the ZnO, our ZnO-modified BN/BNC composite showed preferential sensing activity of NOxat room temperature. The BNFs-135exhibitedhigher sensitivity of33.5%at97ppm and rapider response/recovery of8s. Its structureprovided effective and fast channels for fast capturing and migrating electrons. ThusZnO-modified BN/BNCcomposite was expected to be applied for gas sensing.