Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption
Abstract Cockle shells served as a sustainable and non-toxic calcium source for CO2 capture through carbonation–calcination cycles. In this study, CaCO3 derived from cockle shells was used to synthesize CaCu3Ti4O12 (CCTO) ceramics via the solid-state reaction method and sintered at 1010–1090 °C. The...
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2025-05-01
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| author | Kaniknun Sreejivungsa Suppanat Kosolwattana Morakot Sakulsombat Prasit Thongbai |
| author_facet | Kaniknun Sreejivungsa Suppanat Kosolwattana Morakot Sakulsombat Prasit Thongbai |
| author_sort | Kaniknun Sreejivungsa |
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| description | Abstract Cockle shells served as a sustainable and non-toxic calcium source for CO2 capture through carbonation–calcination cycles. In this study, CaCO3 derived from cockle shells was used to synthesize CaCu3Ti4O12 (CCTO) ceramics via the solid-state reaction method and sintered at 1010–1090 °C. The resulting ceramics exhibited colossal dielectric permittivity (∼ 105 at 1 kHz, 25 °C) and a low dielectric loss (tanδ ≈ 0.04), confirming their suitability for capacitor applications. The high dielectric permittivity was primarily attributed to the internal barrier layer capacitor mechanism, in which insulating grain boundaries separated semiconducting grains, enhancing interfacial polarization. Impedance spectroscopy supported this explanation, while DC bias-dependent dielectric measurements revealed a noticeable decrease in permittivity under applied voltage, indicating that surface barrier layer capacitor effects at the ceramic–electrode interface also contributed to the dielectric behavior. Furthermore, X-ray photoelectron spectroscopy confirmed the presence of oxygen vacancies and hydroxyl groups at the ceramic surface, which facilitated water molecule adsorption and modulated interfacial charge transport. As a result, the CCTO ceramics demonstrated excellent humidity sensing performance, with a fast response time of 0.25 min, a recovery time of 0.45 min, and a low hysteresis error of 2.3%. These findings demonstrate the dual role of cockle shell-derived CaCO3 as both a sustainable CO2 sorbent and a valuable precursor for high-performance dielectric and humidity-sensing ceramics. |
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| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-05-01 |
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| spelling | doaj-art-a1e143e3f6294cf7a24af0ac97cacbbc2025-08-20T03:48:18ZengNature PortfolioScientific Reports2045-23222025-05-0115111910.1038/s41598-025-03201-6Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorptionKaniknun Sreejivungsa0Suppanat Kosolwattana1Morakot Sakulsombat2Prasit Thongbai3Department of Physics, Faculty of Science, Giant Dielectric and Computational Design Research Group (GD-CDR), Khon Kaen UniversityDepartment of Chemistry, Faculty of Science, Khon Kaen UniversityMitr Phol Sugarcane Research Center Co., LtdDepartment of Physics, Faculty of Science, Giant Dielectric and Computational Design Research Group (GD-CDR), Khon Kaen UniversityAbstract Cockle shells served as a sustainable and non-toxic calcium source for CO2 capture through carbonation–calcination cycles. In this study, CaCO3 derived from cockle shells was used to synthesize CaCu3Ti4O12 (CCTO) ceramics via the solid-state reaction method and sintered at 1010–1090 °C. The resulting ceramics exhibited colossal dielectric permittivity (∼ 105 at 1 kHz, 25 °C) and a low dielectric loss (tanδ ≈ 0.04), confirming their suitability for capacitor applications. The high dielectric permittivity was primarily attributed to the internal barrier layer capacitor mechanism, in which insulating grain boundaries separated semiconducting grains, enhancing interfacial polarization. Impedance spectroscopy supported this explanation, while DC bias-dependent dielectric measurements revealed a noticeable decrease in permittivity under applied voltage, indicating that surface barrier layer capacitor effects at the ceramic–electrode interface also contributed to the dielectric behavior. Furthermore, X-ray photoelectron spectroscopy confirmed the presence of oxygen vacancies and hydroxyl groups at the ceramic surface, which facilitated water molecule adsorption and modulated interfacial charge transport. As a result, the CCTO ceramics demonstrated excellent humidity sensing performance, with a fast response time of 0.25 min, a recovery time of 0.45 min, and a low hysteresis error of 2.3%. These findings demonstrate the dual role of cockle shell-derived CaCO3 as both a sustainable CO2 sorbent and a valuable precursor for high-performance dielectric and humidity-sensing ceramics.https://doi.org/10.1038/s41598-025-03201-6Colossal dielectric permittivityCaCu3Ti4O12CaCO3CO2 absorptionCapacitorsHumidity sensors |
| spellingShingle | Kaniknun Sreejivungsa Suppanat Kosolwattana Morakot Sakulsombat Prasit Thongbai Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption Scientific Reports Colossal dielectric permittivity CaCu3Ti4O12 CaCO3 CO2 absorption Capacitors Humidity sensors |
| title | Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption |
| title_full | Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption |
| title_fullStr | Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption |
| title_full_unstemmed | Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption |
| title_short | Colossal permittivity and humidity sensing properties of CaCu3Ti4O12 ceramics derived from cockle shell CaCO3 via CO2 absorption |
| title_sort | colossal permittivity and humidity sensing properties of cacu3ti4o12 ceramics derived from cockle shell caco3 via co2 absorption |
| topic | Colossal dielectric permittivity CaCu3Ti4O12 CaCO3 CO2 absorption Capacitors Humidity sensors |
| url | https://doi.org/10.1038/s41598-025-03201-6 |
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