A highly stable humidity sensor based on a new Bi2O3/CNT hybrid nanostructure

• Published in: Sensors and actuators. A. Physical. 2023-03, Vol.351, p.114141, Article 114141
• Main Authors: Hieu, Nguyen Minh, Phuoc, Cao Van, Hung, Nguyen Manh, Anh, Cao Viet, Phan, Anh D., Nah, Junghyo, Jeong, Jong-Ryul, Huy, Pham Thanh, Kim, Dojin
• Format: Article
• Language: English
• Subjects: Bi2O3; Carbon nanotube; Humidity effect; Nanohybrid humidity sensor
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/j.sna.2022.114141

In this article, we propose a facile chemical fabrication strategy for the synthesis of Bi2O3 nanoparticles/ CNT homophonous nanohybrid for a humidity sensing device development at room temperature. We use a simple bar coating method to prepare Bi2O3 nanoparticles and CNT hybrids. Then the morphology and structure of Bi2O3/CNT are studied using X-ray diffraction, Transmission electron microscopy and other surface area measurements. The humidity sensing properties of the sensor is investigated at room temperature under a variety of analytical value. Bi2O3/CNT nanohybrid with average pore size of ∼22.2 nm displays proportional stable response toward increasing humidity values (from relative humidity (RH) level 0%–90%) and reveals better linearity than pure Bi2O3 (indistinguishable at RH60%+) and higher response (∼90%) than pure CNT (∼15%). [Display omitted] •Bi2O3/ CNT nanohybrid structures enhance humidity linearity properties.•The ∆I calculation which represents the absolute different carrier charges rate confirms the phenomenon.•Bi2O3 pure is a promising humidity material candidate.