Cellulose/TiO2 Humidity Sensor

作     者：Devesa, Susana Benzarti, Zohra Costa, Madalena Cavaleiro, Diogo Faia, Pedro Carvalho, Sandra 

作者机构：Univ Coimbra Dept Mech Engn Ctr Mech Engn Mat & Proc CEMMPRE Adv Prod & Intelligent Syst ARISE Rua Luis Reis Santos P-3030788 Coimbra Portugal Univ Sfax Fac Sci Sfax Dept Phys Lab Multifunct Mat & Applicat LaMMA Soukra Rd Km 3 5BP 1171 Sfax 3000 Tunisia Univ Coimbra Phys Dept Rua Larga P-3004516 Coimbra Portugal Univ Coimbra Ctr Mech Engn Mat & Proc CEMMPRE Elect & Comp Engn Dept Adv Prod & Intelligent Syst ARISEFCTUC Polo 2 P-3030290 Coimbra Portugal 

出 版 物：《SENSORS》 (Sensors)

年 卷 期：2025年第25卷第5期

页      面：1506-1506页

核心收录：

学科分类：0710[理学-生物学] 071010[理学-生物化学与分子生物学] 0808[工学-电气工程] 07[理学] 0804[工学-仪器科学与技术] 0703[理学-化学] 

基　　金：FCT-Fundacao para a Ciencia e Tecnologia PRR-Recovery and Resilience Plan Next Generation EU Funds [02/C05-i01/2022] AM2R project "Mobilizing Agenda for business innovation in the Two Wheels sector" UIDB/00285 LA/P/0112/2020 

主　　题：cellulose TiO2 nanoparticles impedance spectroscopy humidity sensor 

摘      要：Resistivity-type humidity sensors, which detect changes in electrical resistance in response to variations in environmental humidity, have garnered significant interest due to their widespread application in industry, agriculture, and daily life. These sensors rely on diverse materials for fabrication, but their increasing variety has contributed to the accumulation of electronic waste. As a biodegradable polymer, cellulose offers unique advantages, including a naturally hydrophilic structure and a large specific surface area. These properties enable cellulose to reduce e-waste generation while facilitating the efficient adsorption of water molecules. However, despite these benefits, humidity sensors based solely on cellulose often suffer from poor sensitivity due to its limited hydrophilicity and non-adjustable structure. To overcome these limitations, the development of composite materials emerges as a promising solution for enhancing the performance of cellulose-based humidity sensors. Combining the complementary properties of cellulose and TiO2, this work presents the development of a cellulose/TiO2 composite humidity sensor through a sustainable approach. The resulting composite material exhibits significantly improved sensitivity compared with a sensor fabricated purely from cellulose. To achieve this, TiO2 nanoparticles were incorporated into cellulose extracted from potato peels, and the composite film was fabricated using the casting method. The sensor s performance was evaluated by analyzing the dependence of its complex impedance, measured over a frequency range between 2 kHz and 10 MHz, while varying relative humidity (RH).