Dielectric and infrared spectroscopy characterization of Co–Al layered double hydroxides

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 characteri...

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Bibliographic Details
Main Author: Zamaraite, Ilona (author)
Other Authors: Vieira, Daniel E. L. (author), Vieira, L. G. (author), Ribeiro, J. L. (author), Vieira, Joaquim M. (author), Salak, Andrei N. (author), Banys, Jūras (author)
Format: article
Language:eng
Published: 2021
Subjects:
dielectric permittivity
infrared spectra
layered double hydroxide
infrared spectra of layered double hydroxides
layered double hydroxide characterizations
Ciências Naturais::Ciências Físicas
Science & Technology
Online Access:https://hdl.handle.net/1822/78315
Country:Portugal
Oai:oai:repositorium.sdum.uminho.pt:1822/78315
Description
Summary: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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