☆ 4.5 Article

Structural Characterization and Photoluminescent Behavior of CO3Intercalated Zn-Fe Layered Double Hydroxide (LDH) and its Colloids

JOURNAL OF ELECTRONIC MATERIALS (2021)

Journal

JOURNAL OF ELECTRONIC MATERIALS

Volume 50, Issue 4, Pages 1601-1607

Publisher

SPRINGER

DOI: 10.1007/s11664-020-08356-8

Keywords

LDH (layered double hydroxide); photoluminescence; colloids; coprecipitation; exfoliation

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Abstract

The study focused on the photoluminescent properties of Carbonate intercalated Zn-Fe layered double hydroxide colloids in formamide, revealing that surface charge density and surface defects are the main factors affecting photoluminescence in LDH colloids. Various techniques were used to characterize the synthesized LDHs and investigate the PL mechanism, showing that crystallite size also plays a significant role in the process.

Carbonate intercalated Zn-Fe layered double hydroxide (LDH) with Zn2+/Fe(3+)molar ratios 2, 3 and 4 were synthesized by coprecipitation in order to study the photoluminescent (PL) properties of their colloids with various wt.% of LDH in formamide. These synthesized LDHs were characterized by various techniques including x-ray diffraction analysis (XRD), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron mMicroscopy (FE-SEM), energy-dispersive x-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HR-TEM), and photoluminescence spectroscopy (PL). The rhombohedral phase and crystallite size of Zn-Fe LDH were confirmed by XRD. Crystallite size plays an important role in the PL mechanism. HR-TEM showed hexagonal nanosheets with 5-6 nm average particle size. To investigate the PL mechanism of pristine LDH and their colloids, these prepared Zn-Fe LDHs were exfoliated in formamide by varying their Zn2+/Fe(3+)molar ratios (2,3, 4) and LDH concentration (0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.% of LDH). Results revealed that surface charge density and surface defects are the main reasons for PL generation in LDH colloids.

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Morphological Control of Layered Double Hydroxides Prepared by Co-Precipitation Method

Changxin Wei, Xiaoyun Yan, Yi Zhou, Wenke Xu, Yiqi Gan, Yihe Zhang, Na Zhang

Summary: Layered double hydroxides (LDHs) play an important role in various applications due to their biocompatibility, chemical versatility, and high theoretical capacity. This study investigates the crystal morphology control and exfoliation of LDHs. It is found that the interlayer spacing of LDH decreases with the affinity of intercalating ions, making it more difficult to exfoliate into nanosheets. By adjusting reaction conditions and adding specific compounds, the morphology and size of LDH can be controlled. The addition of formamide inhibits the formation of byproducts and reduces the size of LDH nanosheets. NaNO3 improves the monodispersity of LDH nanosheets. Lower standard molar Gibbs free energy leads to larger nanosheets using high saturation co-precipitation method, while the alteration of M2+ shows negligible difference in size and shape using homogeneous co-precipitation method.

CRYSTALS (2022)