Fabrication of b-oriented MFI Film via Langmuir-Blodgett Technique

doi:10.15541/jim20150478

Abstract

Abstract:

A compact and highly b-oriented MFI-type zeolite monolayer was fabricated by assembling anisotropic zeolite micro-crystals extending over the centimeter scale by Langmuir-Blodgett (LB) method. The LB monolayer was subsequently employed as a seed layer for the secondary growth of highly b-oriented and defect-free MFI zeolite films. Firstly, LB technique was used to assemble a highly b-oriented MFI type zeolite monolayer on stainless steel substrates and platinum electrodes at an optimum target pressure of 20 mN/m constantly. Secondly, the precursor pretreatment method for preparing highly b-oriented MFI films was proved to be achievable. The crystal intergrowth and orientation of the MFI films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The experimental results confirmed that the precursor pretreatment method was an effective route to suppress the undesired a-oriented twin growth during the secondary growth step. Finally, the highly b-oriented MFI-type zeolite film modified platinum electrodes were further tested as the working electrodes in an aqueous solution including [Fe(CN)₆]^3- with a diameter of 0.72 nm. Cyclic voltammetry experimental results demonstrated that the b-oriented MFI films fabricated by the Langmuir-Blodgett method were defect-free.

Key words: Langmuir-Blodgett technique, zeolite film, oriented zeolite film

CLC Number:

O611

NIAN Pei, YU Ting, SU Mei-Hui, WANG Zheng, ZHANG Bin-Xing, LI Shan, SONG Zhi, MA Qiang. Fabrication of b-oriented MFI Film via Langmuir-Blodgett Technique[J]. Journal of Inorganic Materials, 2016, 31(4): 377-382.

Figures/Tables 7

Fig. 1 Schematic diagram of b-oriented monolayer assembled by LB technique

Fig. 2 Pressure-area isotherms for modified MFI microcrystals prepared using (a) aqueous, (b) methanol, (c) ethanol, and (d) sec-butanol modified MFI microcrystals

Fig. 3 SEM images and XRD patterns of MFI monolayer assembled on different substrates (a,b) Stainless-steel; (c,d) Platinum plates

Fig. 4 Optical photographs of the MFI monolayer on various substrates (a) Glass and silicon wafer; (b) Stainless-steel

Fig. 5 SEM images of the MFI films synthesized with precursor pretreatment method (a-c) and without precursor pretreatment method (d-f)

Fig. 6 XRD patterns of the MFI films synthesized with precursor pretreatment method for (a) 1.5 h and (b) 3 h Inset is the enlarged images around (0100) peaks

Fig. 7 Cyclic voltammograms of [Fe(CN)6]3- on (a) the bare Pt electrode and (b) the b-oriented MFI film-modified Pt electrode

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