The photonic band gap (PBG) of photonic crystals (PCs) has been proven to move in different gas atmospheres. According to this characteristic, silica PCs were used for the detection of different gases with low concentrations from 1 ppb to 100 ppm in our previous work. (3-aminopropyl)-triethoxysilane (APTES) was used as a modifier for the surface modification of SiO₂ colloidal spheres, and the amino groups were grafted onto the surface of the colloidal spheres by chemical grafting. In this work, the influence of modifier dosage on gas sensitivity and optical properties was discussed. The results suggest that the PCs modified with APTES has improved the gas-sensitivity of CO₂. It was worth noting that the PCs before and after modification have different adsorption behaviors under single gas and mixed gas atmospheres.

事实证明，光子晶体（PC）的光子带隙（PBG）在不同的气体气氛中移动。根据这一特性，在我们以前的工作中，硅胶PC用于检测低浓度从1 ppb到100 ppm的不同气体。（3-氨基丙基）-三乙氧基硅烷（APTES）用作SiO ₂胶体球的表面改性的改性剂，并且通过化学接枝将氨基接枝到胶体球的表面上。在这项工作中，讨论了改性剂用量对气体敏感性和光学性质的影响。结果表明，用APTES改性的PC改善了CO ₂的气敏性。值得注意的是，改性前后的PC在单一气体和混合气体气氛下具有不同的吸附行为。