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ZEOLITE THIN FILM-FIBER INTEGRATED OPTICAL SENSORS FOR HIGHLY SENSITIVE DETECTION OF CHEMICALS IN GAS AND LIQUID PHASES
| Title: | ZEOLITE THIN FILM-FIBER INTEGRATED OPTICAL SENSORS FOR HIGHLY SENSITIVE DETECTION OF CHEMICALS IN GAS AND LIQUID PHASES |
| Author: | ZHANG, JIAN |
| Description: | Abstract Quantitative measurement of trace amount of chemicals in gas and liquid phases often requires time-consuming laboratory sample preparation and sophisticated instruments that are inconvenient for mobile applications highly demanded in many critical areas including environmental monitoring, chemical process control, public health protection, and homeland security defense. Thus, miniaturized chemical sensors capable of in situ, real time and highly sensitive detection have been actively sought by the scientific community in recent years. Among many types of chemical sensors, fiber optic chemical sensors have attracted much attention due to their advantages in small size, high sensitivity, immunity to electromagnetic interference, and remote operation capability. An effective approach to developing fiber optic chemical sensors is to integrate chemically and optically functional materials with structured optical fibers. A variety of materials, including polymers, mesoporous silica and metal oxides, silicon and zeolites have been researched either as selective adsorbing overcoats or as immobilizers for dispersing of chemically sensitive materials on optical substrates. Zeolites are microporous crystalline aluminosilicate materials, which have been traditionally used to develop highly selective adsorbents and membranes for molecular separations and electrode modification to obtain enhanced sensitivity of electrochemical sensors. In the last two decades, considerable research efforts were made to explore the zeolites’ unique combination of chemical and optical properties that are potentially useful for developing new type of zeolite-based optical chemical sensor. However, development of such zeolite optical chemical sensors has been impeded by the difficulties in fabrication of practically useful devices and a lack of fundamental understanding of the optical properties of zeolite host-guest systems. In this dissertation, two types of new zeolite-integrated fiber optic chemical sensors have been developed by directly growing zeolite thin films on structured optical fiber substrates, namely the endface refractive sensors and long period fiber grating sensors. The molecular adsorption induced change of zeolite refractive index has been extensively studied by the endface-coated fiber sensor to understand the sensing mechanisms of the developed sensor systems. The results of this research may open up significant opportunities for developing a new class of zeolite thin film enabled, miniaturized fiber optic sensors suitable for portable applications. |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1195680520
http://hdl.handle.net/2374.OX/9867 |
| Date: | 2007 |
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