Fabrication of bulk alumina structures with humidity sensing capabilities using direct ink write technique
| Autor: | David Espalin, Luisa F. Garcia, Luis C. Delfin, Yirong Lin, Jorge A Diaz, Jaime E. Regis, Elizabeth I. Reza, Anabel Renteria, Tzu-Liang Bill Tseng |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Fabrication Materials science Inkwell Moisture business.industry Mechanical Engineering Humidity 3D printing 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Industrial and Manufacturing Engineering chemistry 0103 physical sciences Relative humidity Composite material 0210 nano-technology business |
| Zdroj: | Rapid Prototyping Journal. 27:822-833 |
| ISSN: | 1355-2546 |
| Popis: | Purpose The purpose of this study is to evaluate different 3D structures for humidity sensing that will enable the fabrication of complex geometries with high moisture sensitivity. Design/methodology/approach Humidity sensors based on alumina ceramics were fabricated using direct ink write (DIW) technique. Different engineered surface area, polymer binder ratio and post-processing treatment were considered to increase moisture sensitivity. Findings It was found that the binder ratio plays an important role in controlling the rheology of the paste during printing and determining the pore size after post-processing treatment. The sensibility of the fabricated humidity sensor was investigated by measuring its capacitance response toward relative humidity (RH) varying from 40% to 90% RH at 25°C. It is shown that using 3D lattice design, printed alumina humidity sensor could improve sensitivity up to 31.6 pF/RH%, over an order of magnitude higher than solid alumina. Originality/value Most of the alumina humidity sensors available are films in nature because of manufacturing difficulties, which limited its potential of higher sensitivity, and thus broader applications. In this paper, a novel 3D alumina humidity sensor was fabricated using DIW 3D printing technology. |
| Databáze: | OpenAIRE |
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