Single-step synthesis of layered double hydroxides ultrathin nanosheets

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• 作者：Yanxia Yan^a ; ^{yanyanxia0806@163.com} ; Qi Liu^a ; ^{shuangyuzuo67@163.com} ; Jun Wang^a ; ^b ; ^{zhqw1888@sohu.com} ; Jinbo Wei^a ; ^{weijinbo0468@126.com} ; Zan Gao^a ; ^{gaozan1234@126.com} ; Tom Mann^a ; ^{tom241@163.com} ; Zhanshuang Li^a ; ^{lzs@hrbeu.edu.cn} ; Yang He^a ; ^{heyang@hrbeu.edu.cn} ; Milin Zhang^a ; ^{zhangmilin@hrbeu.edu.cn} ; Lianhe Liu^a ; ^{liulianhe@hrbeu.edu.cn}
• 关键词：Nanosheet ; Exfoliation ; Layered double hydroxides ; Single-step ; H2O2
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：1 April 2012
• 年：2012
• 卷：371
• 期：1
• 页码：15-19
• 全文大小：953 K

文摘

A novel single-step approach was developed to prepare large-scale MgAl-LDHs ultrathin nanosheets. The key point of the successful realization was that we employed a high concentration of H₂O₂. Oxygen molecules, derived from in situ decomposition of H₂O₂, were speculated to be the decisive factor leading to complete separation of LDHs layers. The ultrathin nanosheets were characterized by XRD, TEM, AFM, FT-IR, and TG-DSC. The results indicated that the thickness of these nanosheets was about 1.44 nm, which was almost in perfect agreement with the theoretical thickness of two LDHs layers. From the TG-DSC curves, the weight loss of these exfoliated MgAl-LDHs ultrathin nanosheets at 500 ¡ãC was 18.5 % , which was much smaller compared to the 32.3 % weight loss of unexfoliated MgAl-LDHs.