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Fabrication of bulk alumina structures with humidity sensing capabilities using direct ink write technique

Journal Article · · Rapid Prototyping Journal

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.

Research Organization:
Univ. of Texas at El Paso, TX (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
DOE Contract Number:
FE0027502; NA0003865
OSTI ID:
1849211
Journal Information:
Rapid Prototyping Journal, Journal Name: Rapid Prototyping Journal Journal Issue: 4 Vol. 27; ISSN 1355-2546
Publisher:
Emerald Group Publishing
Country of Publication:
United States
Language:
English

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