大片单层低缺陷MXene的制备及其膜材料的电磁屏蔽性能

doi:10.7503/cjcu20190207

摘要/Abstract

摘要：

采用原位生成氢氟酸法刻蚀Ti₃AlC₂制备了单片层二维过渡金属碳化物(MXene), 用扫描电子显微镜(SEM)、透射电子显微镜(TEM)及原子力显微镜(AFM)等表征了MXene的微观形貌. 结果表明, 所制备的MXene材料具有大片、单层及低缺陷等特点. 通过抽滤MXene分散液制备的MXene膜材料具有导电性高(3280 S/cm)及韧性优异等特点. MXene膜的屏蔽性能测试结果表明, 8 μm厚的MXene膜屏蔽效能为60.6 dB, SSE/t值则高达19531.1 dB·cm ²·g ^-1. 推测MXene膜的屏蔽机理是一种以吸收为主的电磁干扰屏蔽机制.

关键词: 屏蔽材料, MXene, 大片, 高性能

Abstract:

MXene is a novel two-dimensional material with good hydrophilic surface and superior metallic conductivity. However, high quality MXene with large area, single layer and low-defect is still difficult to be prepared thus far. In this paper, single layer MXene with large area and low-defect was prepared by in situ HF etching Ti₃AlC₂. The microstructures of MXene were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), atomic force microscopy(AFM) and so on. The results show that the size of MXene flakes reaches a few microns and the thickness of flakes is only 1.6 nm; no particle oxidation can be found around flakes. The MXene films were prepared by filtering MXene aqueous solution. The MXene films have the characteristics of high conductivity and outstanding toughness. The conductivity of MXene films is as high as 3280 S/cm. By testing the electromagnetic interference shielding performance of MXene films, the electromagnetic interference shielding effectiveness of the material can reach as high as 60.6 dB with 8 μm thickness and the SSE/t value is up to 19531.1 dB·cm ²·g ^-1. In addition, after analyzing the electromagne-tic shielding mechanism of MXene film, we know that it follows an absorption-dominant electromagnetic interference shielding mechanism.

Key words: Shielding material, MXene, Large size, High performance

中图分类号:

O614
TM25

TrendMD:

吕通,张恩爽,原因,樊志敏,马向雨,成中军,刘宇艳,宫元勋,赵宏杰. 大片单层低缺陷MXene的制备及其膜材料的电磁屏蔽性能. 高等学校化学学报, 2019, 40(10): 2059.

LÜ Tong,ZHANG Enshuang,YUAN Yin,FAN Zhimin,MA Xiangyu,CHENG Zhongjun,LIU Yuyan,GONG Yuanxun,ZHAO Hongjie. Preparation of Large-size Single Layer MXene with Low Defect and Electromagnetic Shielding Performance of MXene Film ^†. Chem. J. Chinese Universities, 2019, 40(10): 2059.

图/表 10

Fig.1 Optical images of MXene colloidal aqueous solutions(2.0 mg/mL)(A) and tyndall effect of MXene colloidal aqueous solutions with lower concentration(0.1 mg/mL)(B)

Fig.2 SEM(A), TEM(B) and high magnification TEM(C) images and selected-area electron diffraction(SAED) pattern(D) of MXene

Fig.3 AFM image(A) and related profile picture(B) of MXene

Fig.4 HAADF-STEM image(A) and related element distribution of MXene(B—F) (B) C; (C) Ti; (D) F; (E) O; (F) Al.

Fig.5 SEM images of cellulose filter membrane(A) and surface(B), cross-sectional(C) SEM images of MXene film Insets: (A) the amplified SEM image of cellulose filter membrane; (B) a photograph of MXene film; (C) flexibility test.

Fig.6 Conductivity test photograph of MXene film

Fig.7 Electromagnetic-interference shielding effectiveness of the MXene films with different thicknesses in X band Thickness/mm: a. 0.7; b. 1.2; c. 3; d. 5; e. 8.

Table 1 Shielding performance comparison of MXene film with other electromagnetic shielding materials

Material	Thickness, t/cm	EMI SE/dB	SSE/(dB·cm³·g^-1)	SSE·t^-1/(dB·cm²·g^-1)	Ref.
rGO	0.25	45.1	173	692	[39]
Graphene aerogel	0.3	37	529	1762	[40]
Carbon foam	0.2	40	241	1250	[41]
CNT-sponge	0.24	22	1100	4622	[42]
CuNi	0.15	25	104	690	[43]
CuNi-CNT	0.15	54.6	237	1580	[43]
Cu foil	0.001	70	7.8	7812	[21]
Copper	0.31	90	10	32.3	[44]
rGO-Fe₃O₄	0.03	24	31	1033	[45]
rGO-PS	0.2	29	64.4	257.6	[46]
rGO-PEI	0.23	12.8	44	191.3	[47]
rGO-PEDOT	0.08	70	67.3	841	[48]
Graphene-PDMS	0.1	19.98	529	1762	[49]
Graphene-PMMA	0.4	19	24	60	[50]
MWCNT-PC	0.21	39	34.5	163	[51]
MWCNT-PS	0.2	30	57	285	[52]
MWCNT-ABS	0.11	50	47.6	432.7	[53]
MXene film	0.0008	60.6	15.63	19531.3	This paper

Fig.8 Effects of thickness on EMI SE at 8.2 GHz of the MXene film SEtotal: total EMI SE; SER: EMI SE from reflection; SEA: EMI SE from absorption.

Fig.9 Microwave shielding mechanism of MXene film

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