The Self-Assembly Composite Photonic Crystal: Toward Easy Humidity Detection by a Smartphone
- 3 November 2020
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 32 (23), 1469-1472
- https://doi.org/10.1109/lpt.2020.3035471
Abstract
We report a self-assembly composite photonic crystal with humidity-controlled structure color, towarding to easy humidity detection by a smartphone. As the key issue, the composite photonic sensor is developed via quasi-coating the silica colloidal photonic crystal (SPC) with hydrophilic metal-organic-framework (MOF). Thus the sensor combines the complementary adsorption properties between SPC and MOF, so that realizes a sensitive humidity sensor with wide dynamic detection range. The performance of the sensor was validated via water vapor testing, that its reflection spectrum shifts ~ 9 nm towards to longer wavelength with the concentration from 500 ppm to 20000 ppm under room temperature. The humidity-controlled structure color of the sensor paves a way for smartphone detection, so that a simple yet powerful smartphone spectrometer is established to analyze the reflection spectrum of the sensor. Thus, a lab-on-a-phone humidity measurement platform is developed. Thanks to the portability, low-cost and user-friendliness, this platform is promising to be a powerful tool for humidity IoT application, from personal health monitoring to environment monitoring.Keywords
Funding Information
- Natural Science Foundation of China (51777150, 51907146, UI866201)
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