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However, the practical implementation of humidity sensors is often limited by reliance on external power sources, making the development of self\u2010powered humidity sensing systems a considerable challenge. This work presents a hierarchical multi\u2010step modification strategy to fabricate an acetaminophen (AP)\u2010modified hydroxylated MXene\/carboxymethylcellulose sodium (CMC\u2010Na) hybrid gel ink (AHMC) with integrated humidity sensing and self\u2010powered functionality. Theoretical calculations reveal that AHMC exhibits exceptional water adsorption capacity, characterized by a lower adsorption energy (\u22120.42 eV) and a shorter adsorption distance (1.69 \u00c5) compared to MXene. The screen\u2010printed paper\u2010based AHMC humidity sensor (PB\u2010AHMC) demonstrates a rapid capacitive response (4.8\/0.6 s) and remarkable response (73524%) with excellent bending stability and environmental durability. Furthermore, the PB\u2010AHMC\u2010based humidity sensor array (PCSA) accurately identifies various subtle respiratory abnormalities with the incorporation of machine learning algorithms. Significantly, a self\u2010powered sensor (SP\u2010AHMC) driven by redox reactions has been developed, achieving a broad detection range (11%\u201397% RH), exhibiting minimal hysteresis (1.0% RH), and delivering a peak output voltage of 0.43 V at 97% RH. Collectively, the AHMC\u2010based sensors demonstrate substantial potential for advancing applications in healthcare monitoring, non\u2010contact humidity detection, and self\u2010powered systems.<\/jats:p>","DOI":"10.1002\/smll.76282","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T12:41:39Z","timestamp":1792068099000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Hierarchically Engineered MXene\/CMC\u2010Na Composites with Acetaminophen Modification for Self\u2010Powered Humidity Sensing"],"prefix":"10.1002","author":[{"given":"Yang\u2010Sheng","family":"Wang","sequence":"first","affiliation":[{"name":"School of Materials and Energy University of Electronic Science and Technology of China  Chengdu People's Republic of 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