摘要
二维过渡金属碳化物(MXene)具有优异的导电性、良好的柔韧性和亲水性等特点,其中Ti_(3)C_(2)T_(x)在电磁波屏蔽领域研究广泛。Ti_(3)C_(2)T_(x)是通过选择性刻蚀MAX相Ti 3AlC 2中Al元素后进一步剥离得到,因此刻蚀和剥离工艺直接决定了Ti_(3)C_(2)T_(x)的物化性质。采用LiF/HCl选择性刻蚀前驱体Ti 3AlC 2,优化刻蚀时间和剥离时间,制备了单/少层Ti_(3)C_(2)T_(x)。通过X射线衍射(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)和扫描电镜(SEM)等对Ti_(3)C_(2)T_(x)表面形貌、化学组成进行表征,并通过矢量网络分析仪(VNA)和四探针测试仪等研究了Ti_(3)C_(2)T_(x)的电磁屏蔽效能及导电性能。结果表明,采用LiF/HCl选择性刻蚀法能够有效制备单/少层Ti_(3)C_(2)T_(x),在刻蚀时间为48 h,超声剥离时间为50 min时,获得的Ti_(3)C_(2)T_(x)薄膜电磁屏蔽性能最高达到52.5 dB,电导率可达7342.1 S/m。同时,Ti_(3)C_(2)T_(x)自支撑薄膜在低厚度下绝对屏蔽效能达18347.65 dB cm^(2)g^(-1),表现出优异的电磁屏蔽性能。
Two-dimensional transition metal carbides(MXenes)have excellent electrical conductivity,flexibility and hydrophilicity,among which Ti_(3)C_(2)T_(x)has been widely studied in the field of electromagnetic wave shielding to date.Ti_(3)C_(2)T_(x)is obtained by selective etching of Al element in MAX phase Ti_(3)C_(2)T_(x)and further stripping,so the etching and stripping processes directly determine the physicochemical properties of Ti_(3)C_(2)T_(x).In this research,LiF/HCl was used to selectively etch the precursor Ti 3AlC 2,and the etching time and stripping time were optimized to prepare single/few-layer Ti_(3)C_(2)T_(x).The surface morphology and chemical composition of Ti_(3)C_(2)T_(x)were characterized by X-ray diffraction(XRD),Raman spectroscopy(Raman),X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM).The electromagnetic shielding effectiveness and electrical conductivity of Ti_(3)C_(2)T_(x)were studied with vector network analyzer(VNA)and four-probe tester.The results showed that the single/few-layer Ti_(3)C_(2)T_(x)can be effectively prepared by the LiF/HCl selective etching method.When the etching time was 48 h and the ultrasonic stripping time was 50 min,the electromagnetic shielding performance of the obtained Ti_(3)C_(2)T_(x)film can reach up to 52.5 dB,and the conductivity can reach 7342.1 S/m.Meanwhile,the absolute shielding efficiency of Ti_(3)C_(2)T_(x)self-supporting film reached 18347.65 dB cm^(2)/g at low thickness,showing excellent electromagnetic shielding performance.
作者
李俊
徐丽慧
卢光明
潘虹
沈勇
王黎明
徐天阳
蔡央芳
LI Jun;XU Lihui;LU Guangming;PAN Hong;SHEN Yong;WANG Liming;XU Tianyang;CAI Yangfang(School of Textiles and Fashion,Shanghai University of Engineering Science,Shanghai 201620,China;LuThai Textile Co.,Ltd.,Zibo 255100,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第1期1097-1103,共7页
Journal of Functional Materials
基金
国家自然科学基金项目(51703123)
上海市自然科学基金项目面上项目(21ZR1426200)。
关键词
二维过渡金属碳化物
电磁屏蔽
导电
单层
two-dimensional transition metal carbide
electromagnetic shielding
electrical conductivity
single layer
