Properties of CeO2/PTFE/Nafion Composite Membranes Prepared by Magnetron Sputtering†

doi:10.7503/cjcu20160282

Abstract

Abstract:

CeO₂/PTFE composite membranes(PTFE=polytetrafluoroethylene) were prepared by magnetron sputtering CeO₂ on the surface of PTFE microporous membranes. The membranes were characterized by XPS and SEM. The properties of the membranes, such as contact angle, tensile strength were investigated. It was found that high quality CeO₂/PTFE composite membranes were obtained under the optimized magnetron sputtering: sputtering time of 120 s and magnetic sputtering power of 40 W. The CeO₂/PTFE composite membranes exhibited better comprehensive performance: favorable hydrophibility and tensile strength. In order to improve the performance of CeO₂/PTFE composite membranes, CeO₂/PTFE/Nafion composite membranes were prepared by Nafion casting. The properties of the composite membrane such as water uptake, ion conductivity were investigated. The water uptake and ion conductivity of CeO₂/PTFE /Nafion composite membranes were 30%, 0.071 S/cm, respectively.

Key words: Polytetrafluoroethylene(PTFE) microporous membrane, Magnetron sputtering, Contact angle, Tensile strength

CLC Number:

O632
O646

TrendMD:

XIA Qingcheng, MAO Fei, YANG Yong, HAN Jing, LIU Xiaohui, YANG Jiazhi, SUN Dongping. Properties of CeO₂/PTFE/Nafion Composite Membranes Prepared by Magnetron Sputtering^†[J]. Chem. J. Chinese Universities, 2016, 37(11): 2108.

Figures/Tables 12

Fig.1 Influence of sputtering power and sputtering time on contact angle of CeO2/PTFE composite MembraneSupttering power/W: a. 20; b. 40; c. 80.

Fig.2 Contact angle of CeO2/PTFE composite membrane at different sputtering time Sputtering power: 40 W. Sputtering time/s: (A) 0; (B) 30; (C) 60; (D) 90; (E) 120; (F) 150.

Fig.3 XRD patterns of CeO2/PTFE composite membrane at different sputtering time

Fig.4 XRD patterns of PTFE(a), CeO2/PTFE(b) and CeO2/PTFE/Nafion membranes(c)

Fig.5 Wide range XPS spectra of PTFE membrane and CeO2/PTFE, CeO2/PTFE/Nafion composite membrane(A), narrow XPS spectra of Ce element in CeO2/PTFE composite membrane(B) and S element in CeO2/PTFE/Nafion composite membrane(C)Insets of (B) and (C) are Ce and S mapping pictures, respectively.

Fig.6 SEM images of native PTFE membrane(A), CeO2/PTFE composite membrane(B), CeO2/PTFE/Nafion composite membrane(C) and elemental analysis graph(D) of CeO2/PTFE/Nafion composite membrane

Fig.8 TGA curves of PTFE(a) and CeO2/PTFE(b—d) membranes at different sputtering time Sputtering power: 40 W. Sputtering time/s: b. 30, c. 60, d. 120.

Fig.9 Rate of accelerating chemical degradation of PTEE(a) and CeO2/PTFE(b) membranes in Fenton’s reagent

Fig.10 Mechanical property of the CeO2/PTFE composite membrane with different sputtering time

Fig.11 Water absorption rate() and swelling property() of PTFE membrane,CeO2/PTFE composite membrane and CeO2/PTFE/Nafion composite membrane

Table 1 Swelling properties of composite membrane

Membrane	Length change(%)	Breadth change(%)	Thickness change(%)	Area swelling ratio(%)	Volume swelling ratio(%)
PTFE	0.26	0.24	0.16	0.5	0.66
CeO₂/PTFE	0.27	0.25	0.18	0.53	0.71
CeO₂/PTFE/Nafion	0.4	0.38	0.36	0.75	1.15

Fig.12 Ionic conductivity of CeO2/PTFE/Nafion composite membrane at different temperatures

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Properties of CeO₂/PTFE/Nafion Composite Membranes Prepared by Magnetron Sputtering^†

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