Synthesis, Anion Exchange, and Delamination of Co−Al Layered Double Hydroxide: Assembly of the Exfoliated Nanosheet/Polyanion Composite Films and Magneto-Optical Studies
Citations Over TimeTop 1% of 2006 papers
Abstract
This paper describes a systematic study on the synthesis, anion exchange, and delamination of Co-Al layered double hydroxide (LDH), with the aim of achieving fabrication and clarifying the properties of LDH nanosheet/polyanion composite films. Co-Al-CO3 LDH hexagonal platelets of 4 mum in lateral size were synthesized by the urea method under optimized reaction conditions. The as-prepared CO3(2-)-LDH was converted to Cl- -LDH by treating with a NaCl-HCl mixed solution, retaining its high crystallinity and hexagonal platelike morphology. LDHs intercalated with a variety of anions (such as NO3-, ClO4-, acetate, lactate, dodecyl sulfate, and oleate) were further prepared from Cl- -LDH via an anion-exchange process employing corresponding salts. Exchanged products in various anion forms were found to show different delamination behaviors in formamide. Among them, best results were observed for NO3- -LDH in terms of the exfoliating degree and the quality of the exfoliated nanosheets. The delamination gave a pink transparent suspension containing well-defined nanosheets with lateral sizes of up to 2 microm. The resulting nanosheets were assembled layer-by-layer with an anionic polymer, poly(sodium styrene 4-sulfonate) (PSS), onto quartz glass substrates to produce composite films. Magnetic circular dichroism (MCD) measurements revealed that the assembled multilayer films exhibited an interesting magneto-optical response.
Related Papers
- → Enhanced Photoresponsive Ultrathin Graphitic-Phase C3N4Nanosheets for Bioimaging(2012)2,111 cited
- → Enhanced fast response to Hg0 by adsorption-induced electronic structure evolution of Ti2C nanosheet(2021)42 cited
- → Liquid phase exfoliation of GeS nanosheets in ambient conditions for lithium ion battery applications(2020)28 cited
- → Density functional theory study towards capability of Ga-doped boron nitride nanosheet as a nanocarrier for 3-allyl-2 selenohydantoin anticancer drug delivery(2020)18 cited
- Preparation of Two-Dimensional Molybdenum Disulfide Nanosheet and Its Application in Electrochemical Biosensors(2015)