研究目的
To investigate the mechanism of effective refractive index change of photonic crystals (PCs) when exposed to different gases or vapors and to propose two physical models (Replacing model and Filling model) to explain the distinct behaviors observed with volatile organic compounds (VOCs) and small-molecule gases.
研究成果
The study demonstrated that the mechanism of PBG redshift in silica PCs depends on the type of gas or vapor. Replacing model and Filling model were proposed to explain the behavior with VOCs and small-molecule gases, respectively. Transforming PBG shifts into volume fraction of adsorbed gas offers a novel approach for selective gas sensing.
研究不足
The study focuses on silica PCs and their interaction with specific gases and vapors. The applicability of the proposed models to other types of photonic crystals or a broader range of gases was not explored.
1：Experimental Design and Method Selection:
Silica PCs were fabricated by a self-assembled method. The study involved exposing these PCs to different gases and vapors to observe shifts in the photonic bandgap (PBG).
2：Sample Selection and Data Sources:
Silica particles of different sizes were synthesized using the St?ber method, and their sizes were controlled by varying the amount of ammonia.
3：List of Experimental Equipment and Materials:
A custom vapor chamber based on a cuvette was designed for gas sensing measurements. Silica particles were synthesized using tetraethoxysilane (TEOS), ammonia, and ethanol.
4：Experimental Procedures and Operational Workflow:
Silica PCs were exposed to various gases, and the transmittance spectra were recorded to observe PBG shifts. The adsorption-desorption behavior was monitored.
5：Data Analysis Methods:
The PBG shifts were analyzed using the Bragg-Snell law, and the effective refractive index was calculated based on the volume fraction of silica and pores.
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