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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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Visible emission from Ag(+) exchanged SOD zeolites
1Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan. linh8112@163.com fujii@eedept.kobe-u.ac.jp.
Nanoscale
|September 10, 2015
Summary
Silver (Ag+) exchanged SOD zeolites exhibit robust green or red emissions, unaffected by environmental changes. This stability suggests potential applications for these materials as durable phosphors.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photophysics
Background:
- Zeolites are crystalline aluminosilicates with well-defined pore structures.
- Silver (Ag+) ions can be incorporated into zeolite frameworks, leading to interesting optical properties.
- Previous studies showed environment-dependent emissions in Ag+ exchanged LTA zeolites.
Purpose of the Study:
- To investigate the photoluminescence properties of thermally-treated Ag+ exchanged SOD zeolites.
- To compare the environmental sensitivity of emissions in Ag+ exchanged SOD and LTA zeolites.
- To elucidate the emission mechanisms in Ag+ exchanged zeolites.
Main Methods:
- Synthesis of Ag+ exchanged SOD and LTA zeolites.
- Thermal treatment of synthesized zeolites.
- Photoluminescence spectroscopy under varying excitation wavelengths.
- Environmental testing (hydration/dehydration).
Main Results:
- Broad visible emissions (green/red) were observed in Ag+ exchanged SOD zeolites, dependent on Ag+ loading and excitation wavelength.
- Unlike Ag+ exchanged LTA zeolites, Ag+ exchanged SOD zeolites showed emission spectra insensitive to hydration/dehydration.
- Proposed emission mechanisms: green emission from ligand-to-metal charge transfer, red emission from metal-metal charge transfer.
Conclusions:
- The limited H2O permeation in SOD zeolites likely causes the insensitivity of their emissions to environmental changes.
- Ag+ exchanged SOD zeolites demonstrate potential as robust phosphors due to their stable emission characteristics.
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