Disruptive chemical approach to modify perovskites for chemical and biological sensors





Citation of Original Publication

Meghan Brandt, Mahack Kazmi, Ching Hua Su, Narasimha Prasad, Bradley Arnold, Fow-Sen Choa, Brian Cullum, Eric Bowman, Krishna S Machuga, N. B. Singh, "Disruptive chemical approach to modify perovskites for chemical and biological sensors," Proc. SPIE 12548, Smart Biomedical and Physiological Sensor Technology XX, 1254804 (14 June 2023); https://doi.org/10.1117/12.2661233


This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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We have been investigating CaCu₃Ti₄O₁₂ class of perovskites for variety of applications due to its very large dielectric constant. Several mechanisms have been proposed for the existence of the high dielectric constant based on grain boundaries and oxygen deficiencies. We will report the results of the effects of monovalent substitution to replace calcium. This will alter the size to distort the perovskite structure. In addition, we used this system as a sensor for organic agents. There were very large changes in dielectric constant and resistivity indicating this system as a very good sensor material.