Journal ArticleDOI
Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide: assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies.
TLDR
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.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.read more
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Journal ArticleDOI
Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene
Sheneve Z. Butler,Shawna M. Hollen,Linyou Cao,Yi Cui,Yi Cui,Jay Gupta,Humberto R. Gutierrez,Tony F. Heinz,Seung Sae Hong,Seung Sae Hong,Jiaxing Huang,Ariel Ismach,Ezekiel Johnston-Halperin,Masaru Kuno,Vladimir V. Plashnitsa,Richard D. Robinson,Rodney S. Ruoff,Sayeef Salahuddin,Jie Shan,Li Shi,Michael G. Spencer,Mauricio Terrones,Wolfgang Windl,Joshua E. Goldberger +23 more
TL;DR: The properties and advantages of single-, few-, and many-layer 2D materials in field-effect transistors, spin- and valley-tronics, thermoelectrics, and topological insulators, among many other applications are highlighted.
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Recent Advances in Ultrathin Two-Dimensional Nanomaterials
Chaoliang Tan,Xiehong Cao,Xiehong Cao,Xue-Jun Wu,Qiyuan He,Jian Yang,Xiao Zhang,Junze Chen,Wei Zhao,Shikui Han,Gwang-Hyeon Nam,Melinda Sindoro,Hua Zhang +12 more
TL;DR: The unique advances on ultrathin 2D nanomaterials are introduced, followed by the description of their composition and crystal structures, and the assortments of their synthetic methods are summarized.
Journal ArticleDOI
Recent advances in the synthesis and application of layered double hydroxide (LDH) nanosheets.
Qiang Wang,Dermot O'Hare +1 more
TL;DR: Delamination of LDHs is an interesting route for producing positively charged thin platelets with a thickness of a few atomic layers, which can be used as nanocomposites for polymers or as building units for making new designed organic- inorganic or inorganic-inorganic nanomaterials.
Journal ArticleDOI
Exfoliation of layered double hydroxides for enhanced oxygen evolution catalysis
Fang Song,Xile Hu +1 more
TL;DR: This work demonstrates the promising catalytic activity of single-layered double hydroxides for the oxygen evolution reaction and reports an orthogonal approach to improve the activity of catalysts without alternating their compositions or structures.
Journal ArticleDOI
Ultrathin Two-Dimensional Nanomaterials.
TL;DR: The state of the art in the development of ultrathin 2D nanomaterials is reviewed and their unique advantages are highlighted, together with some personal insights on the challenges in this research area.
References
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TL;DR: In this article, an in-depth investigation into the nature and characteristics of a ternary compound (Mg/sub 6/Al/sub 2/(OH)/sub 16/CO/sub 3/ x 4H/sub 1/O) and its evolution with the calcination temperature until the formation of the oxide phases was carried out.
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Adsorption of sodium dodecyl sulfate on layered double hydroxides
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Journal ArticleDOI
Preparation of Nanocomposites by Exfoliation of ZnAl Layered Double Hydroxides in Nonpolar LLDPE Solution
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A Novel Synthetic Route to Layered Double Hydroxides Using Hexamethylenetetramine
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