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MFI分子筛膜在光纤微谐振器上合成及表征

作者：郑国龙，程浩，周兰英

单位：北京理工大学机械与车辆学院

关键词：模板剂；沸石分子筛；微谐振器；传感器

DOI号：

分类号： O611.6

出版年,卷(期):页码： 2012,32(2):59-64

摘要：

采用原位水热合成法，分别采用四丙基氢氧化铵（TPAOH）和正丁胺（NBA）为模板剂，在光纤微谐振器表面成功制备出MFI沸石分子筛膜。采用X射线衍射（XRD）和扫描电镜（SEM）对膜的物相结构和晶体形貌进行表征，通过表征分析可以看出，采用四丙基氢氧化铵（TPAOH）为模板剂合成出的沸石晶体具有规则的六棱柱外形，晶粒大小约2 μm，而采用正丁胺(NBA)为模板剂合成出的沸石晶体没有规则外形，晶粒大小约为500 nm。采用镀有沸石的长周期光栅（LPFG）检测体积分数为5%丙酮气体，长周期光栅的谐振波长蓝移了2nm，沸石膜在光纤微谐振表面的合成可用于精密传感器的开发。

Preparation of MFI zeolite molecular sieve membranes on optical fiber micro-resonators by using TPAOH and NBA as templates was investigated by in situ hydrothermal crystallization. Crystal structure and surface morphology of the obtained membranes were characterized by XRD and SEM. It is showed that we can get good zeolite membranes by using TPAOH and NBA as templates. Crystals with the size of about 2 μm were synthesized by using TPAOH as template have regular coffin shape, while crystals with the size of about 500 nm were synthesized by using NBA as template have no regular shape. Furthermore, the MFI zeolite-LPFG sensor was tested for detection of 5% volume fraction acetone gas. The resonant wavelength of LPFG shifted about 2nm toward smaller wavelength. Upon loading analyte molecules, the refractive index of the MFI zeolite changes in the close of the fiber index where the micro-resonator has a large response to achieve high sensitivity.

基金项目：

国家863计划（2008AA03Z301）;

作者简介：

郑国龙（1984-），男，山东，硕士研究生，主要从事沸石镀膜研究，（Tel.15210501075 Email:zhengguolong10@163.com）

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