1 Ocak 2015 Konferans bildirisi Açık Erişim

Eryurek, Mustafa; Karadag, Yasin; Tasaltin, Nevin; Kilinc, Necmettin; Kiraz, Alper

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    <subfield code="a">Hydrogen gas sensing using palladium-coated microdisk microresonators</subfield>
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    <subfield code="a">An SU-8 polymer microdisk resonator coated with a palladium (Pd) layer and coupled to a single-mode optical waveguide is used to as a hydrogen (H-2) gas sensor. In the presence of H2 a red shift is observed in the spectral positions of the microdisk whispering gallery modes (WGMs) due to the expansion in the Pd lattice. H-2 concentrations below the flammable limit (4%) down to 0.3% could be detected in nitrogen atmosphere at room temperature. For H-2 concentrations between 0.3 1%, WGM spectral positions shifted linearly with H-2 concentration at a rate of 32 pm/%H-2. Average response time of the devices was measured to be 50 s for 1% H-2. The proposed device concept can also be used to detect different chemical gases by using appropriate sensing layers.</subfield>
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