Silicon photonic dual-gas sensor for H2 and CO2 detection

We report a silicon photonic dual-gas sensor based on a wavelength-multiplexed microring resonator array for simultaneous detection of H-2 and CO2 gases. The sensor uses Pd as the sensing layer for H-2 gas and a novel functional material based on the Polyhexamethylene Biguanide ( PHMB) polymer for CO2 gas sensing. Gas sensing experiments showed that the PHMB-functionalized microring exhibited high sensitivity to CO2 gas and excellent selectivity against H-2. However, the Pd-functionalized microring was found to exhibit sensitivity to both H-2 and CO2 gases, rendering it ineffective for detecting H-2 in a gas mixture containing CO2. We show that the dual-gas sensing scheme can allow for accurate measurement of H-2 concentration in the presence of CO2 by accounting for the cross-sensitivity of Pd to the latter. (C) 2017 Optical Society of America

我们报道了一种基于波长复用微环谐振器阵列的硅光子双气体传感器，用于同时检测氢气（H₂）和二氧化碳（CO₂）气体。该传感器使用钯（Pd）作为氢气的传感层，以及一种基于聚六亚甲基双胍（PHMB）聚合物的新型功能材料用于二氧化碳气体传感。气体传感实验表明，PHMB功能化的微环对二氧化碳气体具有高灵敏度，对氢气具有优异的选择性。然而，发现Pd功能化的微环对氢气和二氧化碳气体都有敏感性，这使得它在含有二氧化碳的混合气体中检测氢气时无效。我们表明，通过考虑Pd对二氧化碳的交叉敏感性，双气体传感方案可以在二氧化碳存在的情况下准确测量氢气浓度。（C）2017美国光学学会