CAJ | 학술논문

以Si粉、SiO2粉和人造石墨为原料，在1480℃、4 kW、80 min的真空微波辐照条件下快速高效地合成SiC纳米线。利用SEM、TEM、XRD等对所得产物的微观结构解析表明，在未使用催化剂的条件下，基于气固( VS)机制可成功制备出β型SiC。根据坩埚中的部位不同，所得SiC呈现出不同的形貌。坩埚上层的产物呈亮绿色，较为纯净，主要为直径约150 nm的纳米棒，并含有部分微米级SiC晶粒，表面氧化迹象不明显。其余部分产物呈灰绿色，主要是直径为20~50 nm的SiC/SiO2同轴纳米线(表层的SiO2厚度约2 nm)，并夹杂有未反应完全的石墨和SiO2。利用波长为240 nm的激发光分别对SiC纳米棒和同轴纳米线的光致发光特性的测试表明，两者均可观察到峰位在390 nm左右的发射峰，此结果与所报道的β-SiC纳米材料的发光性能相比，蓝移程度更高。
이Si분、SiO2분화인조석묵위원료，재1480℃、4 kW、80 min적진공미파복조조건하쾌속고효지합성SiC납미선。이용SEM、TEM、XRD등대소득산물적미관결구해석표명，재미사용최화제적조건하，기우기고( VS)궤제가성공제비출β형SiC。근거감과중적부위불동，소득SiC정현출불동적형모。감과상층적산물정량록색，교위순정，주요위직경약150 nm적납미봉，병함유부분미미급SiC정립，표면양화적상불명현。기여부분산물정회록색，주요시직경위20~50 nm적SiC/SiO2동축납미선(표층적SiO2후도약2 nm)，병협잡유미반응완전적석묵화SiO2。이용파장위240 nm적격발광분별대SiC납미봉화동축납미선적광치발광특성적측시표명，량자균가관찰도봉위재390 nm좌우적발사봉，차결과여소보도적β-SiC납미재료적발광성능상비，람이정도경고。
SiC nanowires were synthesized by a microwave-heating method at 1480 ° C for 80 min under vacuum, using silicon powder, silica dioxide powder and artificial graphite as raw materials. SEM, TEM and XRD were used to investigate the microstruc-ture of the samples and excitation light with wavelength of 240 nm was used to test the photoluminescence properties of the products. Results indicated thatβ-SiC can be synthesized directly without using a catalyst by the vapor-solid growth mechanism. The samples exhibited different morphologies and sizes at different zones due to the temperature differences. The products in an upper crucible were bright-green, relatively pure SiC, consisting of mainly nano-rods with a diameter of about 150 nm and small amount of SiC micro-crystals, and surface oxidation was not obvious. The products in other zones were grey-green with lots of SiC/SiO2 coaxial nanowires with a diameter around 20-50 nm and a SiO2 surface layer of thickness about 2 nm, and there was also some un-reacted graphite and silica dioxide. Both the SiC nano-rods and SiC/SiO2 coaxial nanowires exhibited a strong broad photoluminescence peak at a wavelength of about 390 nm and a high degree of blue-shift compared with the reported luminescence ofβ-SiC nano-mate-rials.