| Transition metal nitrides belong to a class of interstitial compounds; they have a lot of important application properties. Because of their unique electronic structure, they can be used in such electronic materials as optic, semiconductor, electronic and insulation. Some possess superconductive characters. Therefore,synthesis of nanocrysatllines of bulk transition metal nitrides also is a very important task.The hexagonal InN nanocrystalline ultrathin powder (mixture a little In) was obtained in nitrogen atmosphere, using the dc arc discharge plasma method and the characterization was studied. We have discussed their synthesis mechanism, otherwise, we carried out the acid treatment to synthesized mixed nanopowder by acetum, ultimately, we obtained the pure InN. And their optical properties were characterized. Our main innovative results were presented as follows.(1) In this experiment, we adopted dc arc discharge plasma method to make metal In and nitrogen and obtained InN nanocrystalline successfully. We studied the crystal structure by doing XRD to sample. But because of the low decomposed temperature for InN, which make a little decompose, so there is a little In existed in ultimately production. Through TEM and SEM, the results reveal the morphology of sample is nanoparticles.(2) In order to remove In from the mixture, acid treatment was adopted for the purification. We make specific analysis such as XRD, TEM, SEM, EDS, and Raman and so on for the nanoparticles after acid treatment. The results of XRD and EDS indicated that the sample was pure hexagonal phase InN. The TEM and SEM spectrum evidenced that the sample is InN nanoparticles cluster, the nanoparticles in these clusters turned out to be sheet structure with the size of about 100 nm. The spectrum of the photoluminescence showed that there are two broader emitting peaks lie in 568 nm and 1165 nm, respectively. The former maybe attribute to the surface absorbtion during the acid treatment of the InN. |
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