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SnO 2 nanocrystalline material was prepared with a sol–gel process and thin films of the nanocrystalline SnO 2 were coated on the surface of bent optical fiber cores for gas sensing. The UV/vis absorption spectrometry of the porous SnO 2 coating on the surface of the bent optical fiber core exposed to reducing gases was investigated with a fiber optical spectrometric method...
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