Nanostructured ZnS and CdS Films Synthesized using Layered Double Hydroxide Films as Precursor and Template

Abstract

Anion exchange reactions in layered double hydroxide films (M(OH)(2-x)(NO(3))(x).mH(2)O) followed by solid state conversion reactions are shown to yield micrometer-sized unsupported metal sulfide (M = Zn, Cd) films with unique textured morphologies. The characteristic three-dimensional nanostructured film morphology and crystallinity of the initial films are retained in the metal sulfide films although these conversion reactions involve anion exchanges concomitant with significant rearrangements of the crystal structures. Surface areas of 42 m(2)/g for zinc sulfide and 50 m(2)/g for cadmium sulfide thin films are observed. These values correspond to an increase in surface area of 75% for the Zn(5)(OH)(8)(NO(3))(2).2H(2)O to zinc sulfide conversion, while the cadmium sulfide films exhibit more than three times the surface area of their precursor material, Cd(OH)(NO(3)).H(2)O. The three-dimensional morphology of the resulting films is thus observed to combine the physical properties of the bulk materials with the advantages of higher surface areas typically associated with nanostructured or porous materials. The layered double hydroxide materials used in this study to provide both structural and chemical templates were prepared using the mild conditions of a biologically inspired vapor-diffusion catalytic synthesis.

Hybrid ZnAl‐LDH/CNTs nanocomposites: Noncovalent assembly and enhanced photodegradation performance

“…The fine spectra of Zn2p, Al2p, and O1s for LDH and LDH‐cy‐CNTs are displayed in Figures 7b–d, respectively. For LDH, the BE for Zn2p 3/2 locates 1022.2 eV, indicative of the presence of Zn 2+ species 46. And Al2p BE at 74.3 eV signifies the binding of AlOH 47.…”

Layered hydroxide hybrid nanostructures: a route to multifunctionality

“…To this end, the control of the particle size and the formation of films in which particles are organized are especially under investigation. 149,[214][215][216] Achievements in these fields should lead to real progress in the design of multimaterials, probably concerning multiferroics, optomagnetism or magneto-optics.…”

Layered structured CoAl/CdS‐LDHs nanocomposites as visible light photocatalyst

“…In the recent years, photocatalytic technique, which utilizes a semiconductor as catalyst, has become one of the hot research subjects in the field of photochemistry and has now been widely investigated for environment protection . A variety of semiconductors, such as ZnO , TiO 2 , ZnS , g‐C 3 N 4 , BiOCl , and so on, have been reported as photocatalysts for degradation of organic pollutants. Layered double hydroxides (LDHs), as a typical layered material, were well known as hydrotalcite‐like compounds or anionic clays.…”