研究目的
To present a new organic polymer, PTB7-Th, as a humidity sensing element with improved sensitivity over a large relative humidity range.
研究成果
The PTB7-Th based capacitive humidity sensor demonstrated enhanced sensitivity, good linearity, and fast response times over a wide range of relative humidity levels. The rough and non-uniform surface morphology of the PTB7-Th thin film contributed to the improved sensing performance.
研究不足
The sensor's performance is limited by the operating frequency, with higher frequencies resulting in lower sensitivity. Additionally, the sensor's stability and repeatability at extremely low frequencies were not explored.
1：Experimental Design and Method Selection:
The study focused on fabricating a capacitive humidity sensor using PTB7-Th thin film deposited on coplanar aluminum electrodes. The sensitivity was investigated based on the surface morphology of the polymer thin film.
2：Sample Selection and Data Sources:
PTB7-Th was purchased from Lumtec and used without further purification. Glass substrates were cleaned and used for the deposition of aluminum electrodes and PTB7-Th thin film.
3：List of Experimental Equipment and Materials:
Equipment included a thermal evaporator for aluminum electrode deposition, a spin coater for PTB7-Th thin film application, an AFM for morphological studies, and a humidity chamber for sensor testing.
4：Experimental Procedures and Operational Workflow:
The sensor was fabricated by depositing aluminum electrodes on glass substrates, followed by spin-coating PTB7-Th thin film. The capacitive response was measured in a humidity chamber at various relative humidity levels.
5：Data Analysis Methods:
The sensitivity, linearity, and response times of the sensor were analyzed based on capacitance measurements at different humidity levels and frequencies.
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