Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 218, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.202100106
Keywords
dielectric permittivity; infrared spectra of layered double hydroxides; layered double hydroxide characterizations
Funding
- European Social Fund [09.3.3-LMT-712-19-0046]
- Research Council of Lithuania (LMTLT)
- Slovakia-Portugal bilateral project [FAST-LDH (2019-2020)/APVV-SK-PT-18-0019]
- project CICECO-Aveiro Institute of Materials through the Portuguese Foundation for Science and Technology (FCT)/MCTES [UIDB/50011/2020, UIDP/50011/2020]
- FCT-Portugal [PD/BD/143033/2018]
- Fundação para a Ciência e a Tecnologia [PD/BD/143033/2018, UIDB/50011/2020, UIDP/50011/2020] Funding Source: FCT
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Through dielectric and infrared spectroscopy, the thermal behavior of cobalt-aluminum LDH with nitrate intercalation was extensively characterized, revealing dynamic effects of water clusters in the material.
Layered double hydroxides (LDHs) are natural 2D materials with promising functionalities. A comprehensive understanding of physical properties (such as electrical or optical) is critical for their current and future applications. Herein, dielectric and infrared spectroscopy to extensively characterize thermal behavior of dynamic effects in cobalt-aluminum LDH with Co-to-Al ratio of 2 and intercalated with nitrate is applied. The dielectric response of the vacuum-dried LDH shows noticeable relaxation processes in the radio frequency range. A detailed analysis of the relaxations allows assigning them to the dynamics of water clusters confined in the interlayer. Infrared spectroscopy enables the characterization of bands attributed to the O-H stretching of these water clusters. It is found that a decrease in temperature results in freezing of the water clusters in the interlayers and in the coexistence of water-like and ice-like clusters network in this LDH.
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