Tu Rong, Yang Hang, Zhang Chitengfei, Li Baowen, Xu Qingfang, Li Qizhong, Yang Meijun, Zhang Song
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China.
Nanomaterials (Basel). 2022 Apr 24;12(9):1446. doi: 10.3390/nano12091446.
Phase-selective synthesis is an effective way to expand the ultra-thin transition metal carbide family and tune its properties. Herein, a chemical vapor deposition route with specially designed substrate (Ta wire-Cu foil-Mo foil) is carried out to synthesize Mo-Ta-C ternary nanosheets with tunable phase structure. The Ta atoms diffuse on the surface of liquid copper and Mo atoms diffuse through the liquid copper to the surface, which react with the carbon atoms decomposed from the methane and form the Mo-Ta-C ternary nanosheets. By precisely tailoring the Mo/Ta ratio and growth temperature, ultrathin layered orthorhombic (MoTa)C nanosheets and non-layered cubic (MoTa) C nanosheets with thickness of 21 and 4 nm are selectively synthesized. The approach could pave the way for the formation of multi-component carbide nanosheets with controllable phases.
相选择性合成是扩展超薄过渡金属碳化物家族并调节其性能的有效方法。在此，通过具有特殊设计的衬底（钽丝 - 铜箔 - 钼箔）的化学气相沉积路线来合成具有可调相结构的Mo - Ta - C三元纳米片。钽原子在液态铜表面扩散，钼原子通过液态铜扩散到表面，与甲烷分解产生的碳原子反应形成Mo - Ta - C三元纳米片。通过精确调整Mo/Ta比例和生长温度，可选择性地合成厚度为21纳米和4纳米的超薄层状正交晶系（MoTa）C纳米片和非层状立方（MoTa）C纳米片。该方法可为形成具有可控相的多组分碳化物纳米片铺平道路。
