CAJ | 학술논문

通过电热板在空气中直接加热氧化沉积在硅基片上的Fe膜,在其表面上获得大面积α-Fe2 O3纳米带,这一方法为制备大面积氧化物纳米结构提供了一种非常简单的工艺。研究了所制备的α-Fe2 O3纳米带的形貌、晶体结构、生长机制及其磁性能。α-Fe2 O3纳米带呈尖锐状并沿[110]方向垂直基片生长,其顶端为10~50 nm,长度为几百纳米至几微米。α-Fe2 O3纳米带在较低温度下的生长过程是一种扩散机制。α-Fe2 O3纳米结构的Morin温度TM、Néel温度TN 分别为113和814 K,与其块体材料相比均降低了150 K左右。
통과전열판재공기중직접가열양화침적재규기편상적Fe막,재기표면상획득대면적α-Fe2 O3납미대,저일방법위제비대면적양화물납미결구제공료일충비상간단적공예。연구료소제비적α-Fe2 O3납미대적형모、정체결구、생장궤제급기자성능。α-Fe2 O3납미대정첨예상병연[110]방향수직기편생장,기정단위10~50 nm,장도위궤백납미지궤미미。α-Fe2 O3납미대재교저온도하적생장과정시일충확산궤제。α-Fe2 O3납미결구적Morin온도TM、Néel온도TN 분별위113화814 K,여기괴체재료상비균강저료150 K좌우。
Large-areaα-Fe2 O3 nanobelts were synthesized by heating the Fe film on silicon substrate in air,using a very simple hotplate technique.The morphologies,crystal structures,growth mechanism and magnetic prop-erties of the nanobelts were investigated.The results showed that single-crystalα-Fe2 O3 nanobelts grew per-pendicularly to the substrate along [110]direction with a very sharp tip about 10-50 nm.The length of the nanobelts were from hundreds nanometers to several micrometers.A diffusion mechanism was responsible for theα-Fe2 O3 nanostructure growth at relatively low temperatures.The Morin temperature TM and Néel temper-ature TN ofα-Fe2 O3 nanostructures were only 113 and 814 K,respectively,which were about 150 K lower than those for their bulk counterpart.