An Ultra-Miniaturized Fiber Humidity Sensor Based on Near-Parallel Ion Pathways Induced Efficient Water-Electricity Conversion.
basic_science · Level V
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- Record sourced from PubMed, PMID 39558772.
- Also identified by DOI 10.1002/adma.202411558.
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Abstract
Humidity sensors are vital for ambient monitoring, but existing sensors focus on moisture absorption, overlooking the indispensable role of ion channels in the water-electricity conversion process. Here, an ultra-miniaturized fiber humidity (MFH) sensor based on near-parallel ion pathways is presented. The well-designed nanochannels significantly facilitate ion transport due to the stable charge distribution and the confined ions migration within near-parallel nanostructure, which improves the water-electricity conversion efficiency of moisture-sensitive fibers. Optimized nanochannels enable the MFH sensor to improve the response/recovery speed by ≈5 times compared to the disordered nanochannels. Additionally, the MFH sensor can be woven for ultra-miniaturization (0.50 mm<sup>2</sup>), which is much smaller than current sensors. Therefore, the integrated MFH sensor array demonstrated exceptionally high spatial resolution (sensor density of 1 mm<sup>-1</sup>), highlighting its potential in flexible wearables. This work provides new optimization strategies and assembly means for designing the high-performance humidity sensors of the next generation.