Preparation of nanosheet by exfoliation of layered iron phenyl phosphate under ultrasonic irradiation

Tanaka, Hidekazu; Okumiya, Takeshi; Ueda, Shun-kichi; Taketani, Yukihiko; Murakami, Masahiko

doi:10.1016/j.materresbull.2008.05.016

Cited by 20 publications

(11 citation statements)

References 30 publications

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“…Because of the significant morphological anisotropy, the nanosheets tend to orient themselves, with a certain crystallographic direction perpendicular to substrate surface, and thus introduce additional or greatly enhanced functionalities. Delaminating layered compounds into nanosheets attracted much attention, and monolayer nanosheets have been successfully exfoliated from several types of layered inorganic materials, such as layered double hydroxides (LDHs) [7,8], graphite [9], metal oxides [10], phosphates [11], and chalcogenides [12]. …”

Section: Introductionmentioning

confidence: 99%

Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films

Zhu

et al. 2015

Nanoscale Res Lett

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Efficient exfoliation of well-crystallized (Y0.96TbxEu0.04-x)2(OH)5NO3 · nH2O (0 ≤ x ≤ 0.04) layered rare-earth hydroxide (LRH) crystals into tens of micron-sized unilamellar nanosheets has been successfully achieved by inserting water insoluble oleate anions (C17H33COO−) into the interlayer of the LRH via hydrothermal anion exchange at 120°C, followed by delaminating in toluene. The intercalation of oleate anions led to extremely expanded interlayer distances (up to approximately 5.2 nm) of the LRH crystals and accordingly disordered stacking of the ab planes along the c-axis and also weakened interlayer interactions, without significantly damaging the ab plane. As a consequence, the thickness of the LRH crystals increased from approximately 1 to 10 μm, exhibiting a behavior similar to that observed from the smectite clay in water. Highly [111]-oriented and approximately 100-nm thick oxide films of (Y0.96TbxEu0.04-x)2O3 (0 ≤ x ≤ 0.04) have been obtained through spin-coating of the exfoliated colloidal nanosheets on quartz substrate, followed by annealing at 800°C. Upon UV excitation at 266 nm, the oxide transparent films exhibit bright luminescence, with the color-tunable emission from red to orange, yellow, and then green by increasing the Tb3+ content from x = 0 to 0.04.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-0828-0) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films

Zhu

et al. 2015

Nanoscale Res Lett

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“…Individual nanosheets have been successfully exfoliated from the layered inorganic materials, such as layered double hydroxides (LDHs) [8], graphite [9], metal oxides [10], phosphates [11] and chalcogenides [12]. Mainly due to this, the lateral size of the resulting exfoliated nanosheets is smaller than that of the starting layered inorganic solids.…”

Section: Introductionmentioning

confidence: 99%

Tens of micron-sized unilamellar nanosheets of Y/Eu layered rare-earth hydroxide: efficient exfoliation via fast anion exchange and their self-assembly into oriented oxide film with enhanced photoluminescence

Zhu

et al. 2014

Science and Technology of Advanced Materials

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Layered rare-earth hydroxide (LRH) crystals of (Y0.95Eu0.05)2(OH)5NO3·nH2O with a lateral size of ∼ 300 μm and a thickness of ∼ 9 μm have been synthesized via a hydrothermal reaction of mixed nitrate solutions in the presence of mineralizer NH4NO3 at 200 °C for 24 h. LRH exhibits the ability to undergo intercalation and anion exchange with DS− (C12H25OSO3−) via hydrothermal treatment. Compared with traditional anion exchange at room temperature, hydrothermal processing not only shortens the anion exchange time from 720 to 24 h but also increases the basal spacing. The arrangements of DS− in the interlayer of LRH are significantly affected by the DS− concentration and reaction temperature, and the basal spacing of the LRH-DS sample in the crystal edge is assumed to be larger than that in the crystal center. A higher DS− concentration and reaction temperature both induce more intercalation of DS− anions into the interlayer gallery, thus yielding a larger basal spacing. Unilamellar nanosheets with a lateral size of ≽60 μm and a thickness of ∼ 1.6 nm can be obtained by delaminating LRH-DS in formamide. The resultant unilamellar nanosheets are single crystalline. Transparent (Y0.95Eu0.05)2O3 phosphor films with a uniform [111] orientation and a layer thickness of ∼ 90 nm were constructed with the nanosheets as building blocks via spin-coating, followed by proper annealing. The oriented oxide film exhibits a strong red emission at 614 nm (the 5D0–7F2 transition of Eu3+), whose intensity is ∼ 2 times that of the powder form owing to the significant exposure of the (222) facets.

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“…16,21 与具有二维层状结构的石墨烯不同, 类石墨烯二硫化钼具有特殊的能带结构(图 1b), 22 17,[22][23][24] 作为一类重要的二维层状纳米材料, 类石墨烯二硫化钼以其独特的 "三明治夹心" 层状结构在润滑剂、催化、能量存储、复合材料等众多领域应用广泛. [25][26][27][28][29][30] 相比于石墨烯的零能带隙, 类石墨烯二硫化钼存在可调控的能带隙, 在光电器件领域拥有更光明的前景; [31][32][33] 相比于硅材料的三维体相结构, 类石墨烯二硫化钼具有纳米尺度的二维层状结构, 可被用来制造半导体或规格更小、能效更高的电子芯片, 将在下一代的纳米电子设备等领域得到广泛应用. [16][17][18][19][20][21] 本文综述了类石墨烯二硫化钼的各种制备方法、结构表征手段、光学和电子学方面的性质, 总结了国内外有关类石墨烯二硫化钼在二次电池、场效应晶体管、传感器、有机电致发光、电存储等光电子器件方面的研究进展, 并展望了其应用前景.…”

Section: 引言unclassified

Graphene-Like Molybdenum Disulfide and Its Application in Optoelectronic Devices

Peng¹,

Jian-Jian²,

Chao³

et al. 2013

Acta Physico-Chimica Sinica

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Graphene-like molybdenum disulfide (MoS2), which is composed of a monolayer or few layers of MoS2, is a new two-dimensional (2D) layered material that has attracted considerable attention recently because of its unique structure and optical and electronic properties. Here we first review the methods used to synthesize graphene-like MoS2. "Top-down" methods include micromechanical exfoliation, lithium-based intercalation and liquid exfoliation, while the"bottom-up"approaches covered are thermal decomposition and hydrothermal synthesis. We then discuss several methods used to characterize the 2D layered structures of MoS2, such as atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. We describe the UV-Vis absorption and photoluminescent properties of graphene-like MoS2 and their related mechanisms. Finally, we summarize the application of graphene-like MoS2 in various optoelectronic devices such as secondary batteries, field-effect transistors, sensors, organic light-emitting diodes, and memory. The application principles and research progress are discussed, followed by a summary and outlook for the research of this emerging 2D layered nanomaterial.

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Preparation of nanosheet by exfoliation of layered iron phenyl phosphate under ultrasonic irradiation

Cited by 20 publications

References 30 publications

Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films

Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films

Tens of micron-sized unilamellar nanosheets of Y/Eu layered rare-earth hydroxide: efficient exfoliation via fast anion exchange and their self-assembly into oriented oxide film with enhanced photoluminescence

Graphene-Like Molybdenum Disulfide and Its Application in Optoelectronic Devices

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