Chemical and biological sensing using polarity of material

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https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11416/1141610/Chemical-and-biological-sensing-using-polarity-of-material/10.1117/12.2563877.short?SSO=1

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https://doi.org/10.1117/12.2563877
 http://hdl.handle.net/11603/18637

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UMBC Chemical, Biochemical & Environmental Engineering Department
UMBC Chemistry & Biochemistry Department
UMBC Computer Science and Electrical Engineering Department
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UMBC Student Collection

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2020-04-24

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conference papers and proceedigns
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Ian Emge et al., Chemical and biological sensing using polarity of material, Proceedings Volume 11416, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXI; 1141610 (2020) https://doi.org/10.1117/12.2563877

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©2020 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.  

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Abstract

Polarity is very important in developing materials with colossal dielectric. To meet the demands for the tunable devices and high dielectric parallel plate capacitors, several perovskites such as CaCu₃Ti₄O₁₂ (CCTO), La₂∖₃Cu₃Ti₄O₁₂ (LCTO) Pr₂∖₃Cu₃Ti₄O₁₂ (PCTO) and several other materials of this class have been studied all over the world. Detailed studies showed that results vary a lot based on processing methods, such as powder vs. multi crystals and single crystals. In spite of great progress in processing, low resistivity and process driven variables in properties remain a big hurdle for its applications as a dielectric capacitor. We observed that dielectric values are significantly changed when these materials are exposed to chemicals and biological agents. We used parallel plate capacitor design for making chemical and biological sensors from CCTO member of this group. The data indicated huge difference in the dielectric and resistivity of the exposed samples.