研究目的
To describe a relative humidity (RH) sensing device based on photonic crystal colloids auto-assembled directly on the tip of a multi-mode optical fiber.
研究成果
The fabricated device exhibits significant sensitivity to RH, especially above 50%. Numerical simulations suggest that the swelling of hydrogel-shells mainly fills the air gap between the spheres, attributed to the small PNIPAM Young’s modulus. Further studies are needed to investigate the reproducibility of the sensor fabrication and sensing characteristics.
研究不足
The spectral characteristics are highly non-linear and strongly manufacturing dependent. The resolution of 1% RH at 30% RH significantly decreases at higher RH levels.
1：Experimental Design and Method Selection:
The study involves the preparation of PS-PNIPAM core/shell nanoparticles and their deposition on the tip of an optical fiber using a vertical dip-coating method. The sensing capability is attributed to the hydrogel shell's swelling in response to RH changes.
2：Sample Selection and Data Sources:
PS-PNIPAM nanospheres were chemically prepared and deposited on an IR-VIS multimode silica fiber optic.
3：List of Experimental Equipment and Materials:
Includes a high precision cleaver, automated dip coater system, spectrometer (OceanOptics HR2000+ 190–1100 nm), 1×2 50/50 coupler, VIS optical source (Avantes AvaLight-HAL-(S)-Mini), and a reference electrical humidity sensor (model HIH-4000).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The optical probe and reference sensor were placed in a chamber where RH was varied from 20 to 95%. Optical spectra were monitored for resonant peaks.
5：5%. Optical spectra were monitored for resonant peaks. Data Analysis Methods:
5. Data Analysis Methods: Numerical simulations based on the finite element method (FEM) were performed to investigate the sensing mechanism.
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