Effect of reaction time on synthesis of boron nitride microtube (BNMT) [Bor nitrür mikrotüp (BNMT) sentezine reaksiyon süresinin etkisi]

In this study,boron nitride microtube (bnmt) synthesis was carried out with a catalytic annealing method from amorphous boron powder and nitrogen gas (n2) in the presence of mno2. experiments were performed in n2 atmosphere controlled furnace at 1400°c and also at 1/1 weight ratio of b/mno2 for different time as 2-6 hrs. it was seen that from the results of xrd analysis as the reaction time increases,the crystallinity of h-bn increases. the 6-hour reaction time at which the highest crystal size is obtained with 207 å is the optimum reaction time for the study. it was understood that from the results of ft-ir analysis as the reaction time increases,the peak areas of the b-n stretching and b-n-b bending vibrations and h-bn formation are increased. also,it was understood that from the results of ft-ir analysis the optimum reaction time for the study was 6 hours. it was determined that from the results of edx analysis the atomic ratio 1,03 of b/n is compatible with the chemical stoichiometric ratio (1.00) of the atom b and the atom n of h-bn. it was identified that from the results of sem analyzes the bnmt's diameters changed from 394 to 633 nm and bnmt's lengths changed from 3,13 to 6,12 μm. from the results of the volumetric pore size distribution it was understood that the synthesized material is in a mesoporous structure consisting of particles having a mean pore radius of 16,997 å. as a result,it was observed that the reaction efficiency increased as the reaction time increased in the synthesis reaction of bnmts at 1400° c and the highest reaction efficiency reached to 81,20% after 6 hours reaction time.