二维层状Ti3C2的制备及其增强的微波吸收性能  

Preparation of two-dimensional layered Ti3C2 and its enhanced microwave absorption properties

作　　者：石好好 苏晓磊 刘毅 SHI Haohao;SU Xiaolei;LIU Yi(School of Materials Science and Engineering, Xi’an Polytechnic University, Xi’an 710048, China)

机构地区：[1]西安工程大学材料工程学院,陕西西安710048

出　　处：《纺织高校基础科学学报》2020年第4期51-58,共8页Basic Sciences Journal of Textile Universities

基　　金：陕西省重点研发计划项目(2020GY-035);西安市科技局科技创新引导项目(201805030YD8CG14(14))。

摘　　要：为探究制备工艺对二维层状Ti3C2形貌及吸波性能的影响,采用化学液相蚀刻法,改变蚀刻温度和蚀刻时间,利用质量分数40%的HF选择性蚀刻Ti3AlC2,制得5种二维层状Ti3C2,利用X射线衍射(XRD)、扫描电镜(SEM)和矢量网络分析仪等对所制备样品的微观结构和电磁参数进行表征和测试,优选吸波性能优异的Ti3C2制备工艺。结果表明:当蚀刻温度25℃,蚀刻时间24 h时,可得到结晶度较好的Ti3C2;当蚀刻时间12 h,蚀刻温度40℃时,可得到层间距更大的Ti3C2;当蚀刻时间8 h,蚀刻温度25℃时,Ti3C2具有较宽的有效吸波频段(<-10 dB,0.5 GHz);当匹配厚度为3 mm时,在11.4 GHz处Ti3C2反射率损耗达到极值为-27.95 dB。To investigate the effects of different etching processes on the morphology and microwave absorbing properties of Ti3C2,etching temperature and etching time were changed,Ti3AlC2 was selectively etched by 40%HF in chemical liquid phase etching method,and 5 kinds of two-dimensional layered Ti3C2 were prepared.The microstructure and electromagnetic parameters of the prepared samples were characterized and tested by XRD,SEM and vector network analyer so as to select the preparation process of Ti3C2 with excellent microwave absorbing properties.The results show that(1)when the etching temperature is 25℃and the etching time is 24 h,Ti3C2 with good crystallinity can be obtained;(2)when the etching time is 12 h and the etching temperature is 40℃,Ti3C2 with larger interlayer distance can be obtained;(3)when the etching time is 8h and the etching temperature is 25℃,Ti3C2 has a wide effective absorbing frequency band(<-10 dB,0.5 GHz);(4)when the matching thickness is 3 mm,the reflectivity loss reaches an extreme value of-27.95 dB at 11.4 GHz.

关 键 词：MXenes Ti3C2 吸波性能 阻抗匹配 二维层状结构 蚀刻 

分 类 号：TB321[一般工业技术—材料科学与工程]