深冷处理对锡锑/碳纳米纤维的形貌再造及其机制

Influence of deep cryogenic treatment on SnSb/carbon nanofibers morphologies and its mechanism

为改善锡锑/碳纳米纤维性能,利用深冷处理作为热补偿方式对锡锑/碳纳米纤维进行形貌再造。通过调节深冷与炭化处理的顺序,比较处理顺序的不同对该材料的形貌变化影响,并结合对该材料的晶型结构和含碳量的分析探究其形貌再造机制。结果表明:首先对静电纺锡锑/碳纳米纤维前驱体进行炭化得到锡锑/碳纳米纤维再进行深冷处理,其形貌具有皮芯结构;而如先对静电纺锡锑/碳纳米纤维前驱体进行深冷处理再进行炭化得到的锡锑/碳纳米纤维,其锡锑合金在纳米纤维中的分布则表现出更不均匀性;深冷处理后得到的纳米纤维中的碳含量均有增加;结合其晶型结构分析认为,深冷处理对锡锑/碳纳米纤维的形貌再造归因于该处理技术的晶粒细化作用。

The morphologies of SnSb/carbon nanofibers were rebuilt by the deep cryogenic treatment to improve the fibers properties. The influence of deep cryogenic treatment on SnSb/carbon nanofibers morphologies was studied by adjusting the process order of deep cryogenic treatment and carbonization. The rebuilt mechanism was explored according to analysis on the crystalline structure and the carbon contents. The results showed that a core-shell structure is built by first treating electrospun SnSb/carbon nanofibers precursor using carbonization and then performing the deep cryogenic treatment, while an uneven dispersed SnSb alloy in nanofibers is built by first treating electrospun SnSb/carbon nanofibers precursor using the deep cryogenic treatment and then carbonizing. The increased carbon contents appeared in SnSb/carbon nanofibers after the deep cryogenic treatment. The influence of grain refinement is responsible for the morphologies rebuilt of SnSb/carbon nanofibers based on the analysis of crystalline structure.