摘要
为了探索制备具有高热电优值的一维纳米材料,采用脉冲电化学技术制备了一种热电Bi_(2)Te_(3)/Bi_(2)Se_(3)多层纳米线材料。对电沉积过程的监测结果表明,电沉积过程中电解液电阻不断增大,随着电沉积过程的延续,电解液电阻增大幅度越来越小。对电沉积产物进行退火处理,然后溶解掉模板,进行XRD测试。结果表明,所制备的产物是Bi_(2)Te_(3)/Bi_(2)Se_(3),同时,出现很多"卫星峰",表明所制备的材料具有超晶格结构。运用FE-SEM、TEM对产物形貌进行分析,模拟了多层纳米线可能的生长机制。结果发现,所制备的材料是像"弹簧"一样形状的Bi_(2)Te_(3)/Bi_(2)Se_(3)多层纳米线,其生长过程受动力学因素控制。通过对脉冲时间的调节,可以实现对多层纳米线周期的调制。HRTEM、SAED分析结果结合XRD测试结果表明,多层纳米线是由Bi_(2)Te_(3)和Bi_(2)Se_(3)构成的单晶材料。
Bi_(2)Te_(3)/Bi_(2)Se_(3)multi-layered nanowire arrays with the spring morphology were fabricated by pulsed current electrodeposition.Also,the deposition course was monitored by electrochemical workstation connected with a computer.It is found that the whole resistance of the three-electrode electrochemical system gradually increases,but the increase amplitude of the resistance becomes smaller and smaller with the extension of electrodeposition process.And then,the electrodeposited products were annealed,and the template was dissolved for XRD test.XRD results analysis show that the as-deposited multi-layered nanowire arrays are Bi_(2)Te_(3)/Bi_(2)Se_(3)nanowires.Meanwhile,there are some“satellite peaks”appearing in the XRD pattern,conforming that the as-fabricated materials has superlattice structure.The phase structure and morphology were characterized by FE-SEM and TEM,and the possible growth mechanism of multi-layered nanowires was simulated.The morphology of the as-prepared materials is spring-like multi-nanowires,maybe was controlled mainly by kinetics factors.By adjusting the pulse time,the period of the multi-layered nanowires can be modulated.The HRTEM and SAED results show that the multi-layered nanowires are single crystal materials composed of Bi_(2)Te_(3)and Bi_(2)Se_(3).
作者
李晓龙
邸友莹
侯小洁
李燕怡
陈凤英
周春生
元春梅
黄娜
魏伟
Li Xiaolong;Di Youying;Hou Xiaojie;Li Yanyi;Chen Fengying;Zhou Chunsheng;Yuan Chunmei;Huang Na;Wei Wei(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第12期4486-4492,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金(21873063)
商洛学院科研基金(19SKY001)。
关键词
热电材料
脉冲电沉积
多层纳米线
弹簧
机制
thermoelectric materials
pulsed-electrodeposition
multi-layered nanowires
spring
mechanism
