A large number of single-crystalline TaS_2 nanobelts have been prepared via a two-step method. In this approach, TaS_3 nanobelts as precursors were synthesized via chemical vapour transition (CVT), and pyrolysed into TaS_2 nanobelts in vacuum. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the TaS_2 nanobelts have a rectangular section of approx 15 X 40 to 80 X 900 nm~2, and length up to several centimetres. Magnetic measurement indicated that the TaS_2 nanobelts have superconductivity at 2.7 K, and the superconducting transition temperature (T_c) is higher than that (T_c = 0.8 K) reported for the bulk 2H-TaS_2. The current density in electron field emission reached about 100 mu A cm~(-2) at an applied field of about 27 V mu m~(-1), so the nanobelts could be used as electronic field emitters.
展开▼
机译：已经通过两步法制备了大量的单晶TaS_2纳米带。通过这种方法，通过化学气相转移（CVT）合成了作为前驱体的TaS_3纳米带，并在真空中将其热解为TaS_2纳米带。透射电子显微镜（TEM）和扫描电子显微镜（SEM）显示，TaS_2纳米带的矩形截面约为15 X 40至80 X 900 nm〜2，长度可达几厘米。磁性测量表明，TaS_2纳米带在2.7 K处具有超导性，并且超导转变温度（T_c）高于报道的2H-TaS_2本体的超导转变温度（T_c = 0.8 K）。在约27 Vμm〜（-1）的施加电场下，电子场发射中的电流密度达到约100μA cm〜（-2），因此可以将纳米带用作电场发射器。
展开▼
