A Humidity Sensor Based on Bacterial Nanocellulose Membrane (BNC)

Author(s)

Ginja, Gabriel Augusto ; de Campos da Costa, Joao Paulo ; Gounella, Rodrigo Henrique ; Eirez Izquierdo, Jose Enrique ; Carmo, Joao Paulo ; Fonseca, Fernando Josepetti ; Cavallari, Marco Roberto ; Ando, Oswaldo Hideo ; de Souza, Samara Silva

• Document type: Journal article
• Source: IEEE SENSORS JOURNAL; v. 23, n. 4, p. 8-pg., 2023-02-15.

Abstract

This article presents the development of a humidity sensor based on bacterial nanocellulose membrane (BNC) produced from Komagataeibacter xylinus. BNC has a porous surface that absorbs water and therefore it changes the mechanical and electrical properties of the membrane. As the amount of water inside the membrane increases the capacitance of the membrane also increases. The capacitance of the BNC was measured in different values of temperature (from 30 degrees to 100 degrees) and relative humidity (from 30% to 100%). Chronoamperometry was used as a reproducibility test and the result was a linear and more precise variation for RH over 50% and a temperature of 30 degrees. The measurements showed a combined sensitivity of -4.13 nF/degrees C in relation to the temperature, and +492 nF/(%RH) and +66.8 nA/(%RH) in relation to the relative humidity. (AU)

• FAPESP's process: 19/18656-6 - Development of electron beam irradiation system and its application in the modification of semiconductor materials
• Grantee: João Paulo de Campos da Costa
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/05248-7 - CMOS microdevice to enable new brain stimulation therapies
• Grantee: João Paulo Pereira Do Carmo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/24354-2 - Virtual instrumentation system using LabView for reception, processing, visualization and storage of biopotentials for electrocardiograms.
• Grantee: José Enrique Eirez Izquierdo
• Support Opportunities: Scholarships in Brazil - Technical Training Program - Technical Training