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Issue 23, 2014
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Zeolite films as building blocks for antireflective coatings and vapor responsive Bragg stacks

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Abstract

Zeolite films (LTL, BEA and MFI) are prepared with a thickness in the range 50–170 nm through a multistep spin-on deposition method. The optical properties of the zeolite films including refractive index, extinction coefficient and thickness are determined from the reflectance spectra using a nonlinear curve fitting method. The total free pore volume of the films using the Bruggeman effective medium theory is calculated. The potential of the zeolite films for broadband antireflection (AR) application is demonstrated. Five times reduction of the reflectance of a silicon substrate covered with the double AR films comprising of MFI type zeolite (120 nm) deposited on Nb2O5 (60 nm) is achieved. Additionally, the MFI zeolite film is used as a building block of vapor responsive Bragg stacks with a strong response towards acetone. The reversible response of the Bragg stacks towards acetone without additional annealing opens up the possibility of preparing sensors with optical read-out by incorporation of sensitive and transducer elements into a single device.

Graphical abstract: Zeolite films as building blocks for antireflective coatings and vapor responsive Bragg stacks

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Publication details

The article was received on 10 Mar 2014, accepted on 10 Apr 2014 and first published on 10 Apr 2014


Article type: Paper
DOI: 10.1039/C4DT00711E
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Citation: Dalton Trans., 2014,43, 8868-8876
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    Zeolite films as building blocks for antireflective coatings and vapor responsive Bragg stacks

    T. Babeva, H. Awala, M. Vasileva, J. El Fallah, K. Lazarova, S. Thomas and S. Mintova, Dalton Trans., 2014, 43, 8868
    DOI: 10.1039/C4DT00711E

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