A low-cost printed humidity sensor on cellulose substrate by EHD printing
JOURNAL OF MATERIALS RESEARCH(2021)
摘要
The use of printing technologies is rapidly increasing in area of electronic devices. Electrohydrodynamic (EHD) jet printing has been a target of research because of its aptness to produce high-resolution patterns for wide range functional materials onto flexible substrates. In this paper, a stable humidity sensor was printed utilizing PEDOT: PSS as sensing layer. Meander-type electrodes using silver nanoparticles ink were fabricated using continuous EHD inkjet printing on flexible paper (cellulose) substrate. The sensing material PEDOT: PSS was dissolved in ethylene glycol and then deposited on silver electrodes. The fabricated sensor exhibited decent response toward change in capacitance above 50% relative humidity. The response and recovery time of the printed sensor for increasing and decreasing humidity levels were approximately 0.58 s and 0.7 s, respectively. This low-cost sensor has potential applications in agriculture, food monitoring, medical and industrial environment as a disposable sensor for humidity detection. Graphical abstract Fig. (A): Schematic illustration of EHD printing system, (B): (1) 200 × Optical microscopy images of PEDOT: PSS (a) 50% layer (b) 30% layer (c) 20% layer and (2) AFM images of PEDOT: PSS (a) 50% layer (b) 30% layer (c) 20% layer, (C): Humidity sensor (a) Schematics (b) Printed Ag Electrodes and (c) PEDOT: PSS deposited, and (D): (a) Measured capacitance and (b) Response and Recovery time of 50% PEDOT:PSS sensor and (E): PEDOT:PSS ink preparation.
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