Evolution of structural and chemical properties of CoAl-based layered double hydroxides grown on silicon substrate

Flexible Visible-Blind Ultraviolet Photodetectors Based on ZnAl-Layered Double Hydroxide Nanosheet Scroll

“…The properties of LDHs can be modulated by combination with a wide variety of metal cations and anions. Among them, ZnAl-LDH is an excellent visible-blind UV-absorbing material because of its wide band gap, easy fabrication by low-temperature hydrothermal synthesis, low cost, and environmental friendliness. − Particularly, because of the advantages of multiple sheets structure, that is, a scroll structure, it exhibits excellent flexibility or bendability. In this paper, we demonstrate for the first time the feasibility of using an LDH nanosheet with a scroll structure as an active layer in a flexible and visible-blind UV photodetector (Figure a).…”

Transparent and Unipolar Nonvolatile Memory Using 2D Vertically Stacked Layered Double Hydroxide

“…During this process, each metal (Zn, Ni, or Co) cation from the precursor starts to substitute a large number of Al cations in aluminum hydroxide, forming [M(OH) 6 ] octahedral units. [ 14–16 ] Such a unit prefers to grow in the lateral direction, resulting in stackable positively charged 2D sheet‐like layers (Figure 1a). In addition, [(NO 3 − )·6H 2 O] was intercalated between the 2D layers for charge balancing, completing the stacking LDH formation on the FTO/glass substrate.…”

“…This XRD result is in agreement with previous literature and indicates the successful synthesis of the crystalline structure of Al‐based LDHs. [ 14–16 ] Importantly, the LDH morphology and packing density affect the transmittance of the LDH‐coated substrate, as shown in Figure 1e. The transmittance of the vertically stacked ZnAl‐LDH is higher than that of both NiAl‐LDH and CoAl‐LDH, up to ≈87% in the visible range from 400 to 1000 nm.…”

“…[13] In particular, LDH-based films can be uniformly grown on a large-scale substrate through a simple and well-controlled hydrothermal process, regardless of the type of substrate, without requiring a high-temperature process. [14][15][16] Furthermore, in addition to the energy bandgap, the morphology of LDH materials can also be adjusted according to the type of metal cation used during the synthesis, thereby providing electrical and morphological versatility. [17][18][19] Based on these merits, they have been widely studied as functional nanomaterials for diverse electrical and chemical applications, including luminescence sources, [20] nanocomposite hydrogels, [21] catalysts, [22] energy storage, [23] anion-exchangers, [24] and chemical nanocontainers.…”

Development of Multifunctional CoAl Based Layered Double Hydroxide Protective Film on Aluminum Alloy

“…However, the protective performance of photocatalytic LDH materials has not yet been investigated to the best of our knowledge. Cobalt-based LDH materials exhibit unique optical properties, showing discrete absorption lines in the visible spectral range and have been investigated as photocatalyst materials for Fenton reactions [26,27] and in the photodecomposition of complex organic molecules such as methyl orange [28], nitrobenzene [29], rhodamine B, and acid red G [30]. Therefore, it is of considerable interest to learn how to control the preparation of cobalt-based layered double hydroxide directly on the metallic surface, where the conductive surface may facilitate the efficient transportation of photogenerated charges.…”