Abstract
This paper reports the preparation of a type of Ag-embedded zeolite crystals as surface-enhanced Raman spectroscopy (SERS) substrates by chemical reduction of Ag+-exchanged ZSM-5. Ag+ ions were loaded into the zeolite framework by ion exchange. Then the exchanged-Ag+ ions were reduced and metallic silver clusters formed inside the zeolite channel. The resulting Ag-embedded zeolite crystals are characterized by using a number of techniques including X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy to confirm silver formed inside the crystal channel. The fabricated Ag-embedded ZSM-5 zeolite substrates displayed strong and reproducible SERS activity for different Raman probe molecules such as Tris(2,2′-bipyridyl) ruthenium(II) chloride (RuBpy) and rhodamine 6G (R6G). Since silver embedded into the zeolite channel without changing the crystal surface property, the Ag–ZSM-5 zeolite crystal can be used to prepare different SERS-active substrate (SERS-tags), in which different probe molecules may be detected. Such Ag-embedded zeolite substrate would be useful in chemical and biological sensing and in the development of SERS-based analytical devices.
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Acknowledgements
Support for this research came from the Water Innovation Fund of the State of New Mexico and Natural Science Foundation (CHE-0632071). The authors would like to thank Ms. Liz Bustamante for the assistance in preparing the manuscript.
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10853_2010_5199_MOESM1_ESM.doc
Supproting information available. XRD pattern and SEM image of Na-ZSM-5 crystals, composition of the prepared zeolite crystals. This material is available free of charge via the Internet at doi:10.1007/s10853-010-5199-4 (DOC 435 kb)
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Liu, N., Gong, M., Zhang, P. et al. Silver-embedded zeolite crystals as substrates for surface-enhanced Raman scattering. J Mater Sci 46, 3162–3168 (2011). https://doi.org/10.1007/s10853-010-5199-4
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DOI: https://doi.org/10.1007/s10853-010-5199-4