Self-expansion, self-exfoliation and self-dispersion: insights into colloidal formation of atomically thin two-dimensional MoO2.5(OH)0.5

Hai Wang; Yan Su

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Self-expansion, self-exfoliation and self-dispersion: insights into colloidal formation of atomically thin two-dimensional MoO2.5(OH)0.5

机译：自我扩张，自我去角质和自我分散：洞察胶体形成原子薄二维MOO2.5（OH）0.5

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Large-scale synthesis of colloidal two-dimensional (2D) monolayered nanosheets has been a great challenge for material science. The difficulties are caused by the low exfoliation ability of 2D bulk materials, the poor dispersion and high instability of colloidal solutions. Conventional exfoliation and dispersion of these bulk 2D materials usually involve chemical modification via functionalization, intercalation or oxidation, which was detrimental to their intrinsic physical and chemical properties. In the present study, we develope a novel “green” liquid exfoliation method to prepare highly dispersible colloidal MoO _(2.5) (OH) _(0.5) nanosheets in water. The as-obtained water-dispersible colloidal solutions (average particle size 20 nm and thickness 0.6–0.8 nm) kept in stable state longer than 10 months and show time-dependent photoluminescence (PL). Based on the results of combined time-dependent ex situ TEM observation experiments and ex situ XRD simulations, a novel “self-expansion and self-exfoliation” model was proposed to elucidate the formation of colloidal formation of atomically thin 2D MoO _(2.5) (OH) _(0.5) . It is expected that the present method has potential to be extended to colloidal formation of other layered compounds.

机译：大规模合成胶体二维（2D）单层纳米片对物质科学一直是一个巨大的挑战。困难是由2D散装材料的低剥离能力，分散性差和胶体溶液的高不稳定性引起的。这些散装2D材料的常规剥离和分散通常涉及通过官能化，插层或氧化的化学改性，这对其内在的物理和化学性质有害。在本研究中，我们开发了一种新颖的“绿色”液体剥离方法，制备高度分散的胶体MOO _（2.5）（OH）_（0.5）纳米液在水中。在稳定的状态下保持在稳定状态的水分散性胶体溶液（平均粒径20nm和厚度为0.6-0.8nm）并显示时间依赖性的光致发光（PL）。基于组合时间依赖性的EX原位TEM观察实验和出于原地XRD模拟，提出了一种新颖的“自我膨胀和自我去角质”模型，阐明了原子薄2D MOO _（2.5）的胶体形成的形成（哦）_（0.5）。预期本方法具有延伸到其他层状化合物的胶体形成。

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《RSC Advances》 |2016年第100期|共10页
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Hai Wang; Yan Su;
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1. Self-expansion, self-exfoliation and self-dispersion: insights into colloidal formation of atomically thin two-dimensional MoO2.5(OH)(0.5) [J] . Wang Hai, Su Yan RSC Advances . 2016,第100期

机译：自我膨胀，自我去角质和自我分散：对原子薄二维MOO2.5（OH）（0.5）的胶体形成洞察力
2. Two-Dimensional Cr-Doped MoO2.5(OH)(0.5) Nanosheets: A Promising Anode Material for Lithium-Ion Batteries [J] . Lu Huibing, Yang Caihong, Li Cunjun, ACS applied materials & interfaces . 2019,第14期

机译：二维CR掺杂MOO2.5（OH）（0.5）纳米液：用于锂离子电池的有前途的阳极材料
3. Deformation induced atomic-scale frictional characteristics of atomically thin two-dimensional materials [J] . Peng Yitian, Zeng Xingzhong, Yu Kang, Carbon: An International Journal Sponsored by the American Carbon Society . 2020,第期

机译：变形诱导原子薄二维材料的原子尺度摩擦特性
4. In-situ atomic visualization of structural transformation in Hf0.5Zr0.5O2 ferroelectric thin film: from nonpolar tetragonal phase to polar orthorhombic phase [C] . Yunzhe Zheng, Chaorong Zhong, Yonghui Zheng, IEEE Symposium on VLSI Technology . 2021

机译：HF0.5ZR0.5O2铁电薄膜中结构变换的原位原子可视化：从非极性四方相到极性正畸相位
5. Riveting Two-Dimensional Materials: Exploring Strain Physics in Atomically Thin Crystals with Microelectromechanical Systems [D] . Christopher, Jason W. 2018

机译：铆接二维材料：利用微机电系统探索原子薄晶体中的应变物理
6. A Comparative Study on the Ferroelectric Performances in Atomic Layer Deposited Hf0.5Zr0.5O2 Thin Films Using Tetrakis(ethylmethylamino) and Tetrakis(dimethylamino) Precursors [O] . Baek Su Kim, Seung Dam Hyun, Taehwan Moon, 2020

机译：四（乙基甲基氨基）和四（二甲基氨基）前体在原子层沉积Hf0.5Zr0.5O2薄膜中铁电性能的比较研究
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Self-expansion, self-exfoliation and self-dispersion: insights into colloidal formation of atomically thin two-dimensional MoO2.5(OH)0.5

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