Catalytic synthesis of boron nitride nanotubes at low temperatures

Chemical Vapor Deposition (CVD) technique is an advantageous technique that allows highly pure BNNT synthesis in considerably large amounts. The synthesis quality and the energy efficiency of CVD process is mainly governed by appropriate catalyst choice. This work offers the synthesis and use of a novel alkali based catalyst that is to be used in BNNT synthesis by thermal CVD. The catalyst works at temperatures as low as 750oC that is far below previously reported temperature ranges in the current state of art (1100 oC -1300 oC). Phase analysis of newly introduced catalyst is conducted via XRD. The structural characterization was carried out by Raman Spectroscopy. Microstructure was investigated by SEM and TEM analysis by focusing on size and wall structure of BNNTs, which shown that highly crystalline, long and straight MWBNNTs can be produced on the ceramic substrate at low temperatures by using KFeO2 as parent material. The growth mechanism and the chemical composition was revealed by TEM-EDS and EELS measurements.