MoS2 cleaning by acetone and UV-ozone: Geological and synthetic material

Freedy, Keren M.; Sales, Maria Gabriela; Litwin, Peter M.; Krylyuk, Sergiy; Mohapatra, Pranab K.; Ismach, Ariel; Davydov, Albert V.; McDonnell, Stephen

doi:10.1016/j.apsusc.2019.01.222

Cited by 10 publications

(9 citation statements)

References 25 publications

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“…Moreover, it is difficult to remove the volatile organic solvent from the nanoconfined environment in NS through evaporation at ambient condition. It is known that the adsorbed organic solvents show great influence on the properties and device performance of TMDC nanosheets. − Consequently, the performance of the TMDC NS-based device could be further improved by removing the organic solvent from the NS. Therefore, it is necessary to develop an organic solvent-free method to prepare TMDC NS and enhance its performance.…”

Section: Introductionmentioning

confidence: 99%

Solvent-Free Preparation of Closely Packed MoS₂ Nanoscrolls for Improved Photosensitivity

Zhao

You

et al. 2022

ACS Appl. Mater. Interfaces

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Due to their enhanced light absorption efficiency, one-dimensional (1D) transition metal dichalcogenide (TMDC) nanoscrolls derived from two-dimensional (2D) TMDC nanosheets have shown excellent optoelectronic properties. Currently, organic solvent and alkaline droplet-assisted scrolling methods are popular for preparing TMDC nanoscrolls. Unfortunately, the adsorption of organic solvent or alkaline impurities on TMDC is inevitable during the preparation, which affects the optoelectronic properties of TMDC. In this work, we report a solvent-free method to prepare closely packed MoS 2 nanoscrolls by dragging a deionized water droplet onto the chemical vapor deposition grown monolayer MoS 2 nanosheets at 100 °C (referred to as MoS 2 NS-W). The as-prepared MoS 2 NS-W was well characterized by optical microscopy, atomic force microscopy, and ultralow frequency (ULF) Raman spectroscopy. After high temperature annealing, the height of MoS 2 nanoscrolls prepared using an ethanol droplet (referred to as MoS 2 NS-E) greatly decreased, indicating the loss of encapsulated ethanol in MoS 2 NS-E. While the height of MoS 2 NS-W was almost unchanged under the same conditions, implying that no water was embedded in the scroll. Compared to the MoS 2 NS-E, the MoS 2 NS-W shows more ULF breathing mode peaks, confirming the stronger interlayer interaction. In addition, the MoS 2 NS-W shows a higher Young's modulus than MoS 2 NS-E, which could arise from the closely packed scroll structure. Importantly, the MoS 2 NS-W device showed a photosensitivity 1 order of magnitude higher than that of the MoS 2 NS-E device under blue, green, and red lasers, respectively. The decreased photosensitivity of MoS 2 NS-E was attributed to the larger dark current, which might be assigned to the adsorbed ethanol between the adjacent layers in MoS 2 NS-E. Our work provides a solvent-free method to prepare closely packed MoS 2 nanoscrolls at large scale and demonstrates their great potential for high-performance optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Solvent-Free Preparation of Closely Packed MoS₂ Nanoscrolls for Improved Photosensitivity

Zhao

You

et al. 2022

ACS Appl. Mater. Interfaces

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“…After carbonization, biomass materials form amorphous carbon, which need to be soaked for a long time to show hydrophilicity. In order to make CGA soak quickly in water, combined with the previous study of the surface superhydrophilic method, benzophenone was used as a photoinitiator and UV-grafting of acrylic acid monomer on the surface of CGA was carried out (Figure h). − Compared with CGA, UV-grafting with PAA did not bring noticeable change in the weight, size, or pores of SH-CGA. Both the SEM micrographs of CGA and SH-CGA show an interconnected 3D framework of microporous structure with pore sizes varying from 5 to 50 μm, but there is a layer of coating on the surface of SH-CGA (Figure i).…”

Section: Results and Discussionmentioning

confidence: 99%

Migration Crystallization Device Based on Biomass Photothermal Materials for Efficient Salt-Rejection Solar Steam Generation

Zhou

Zhang

et al. 2020

ACS Appl. Energy Mater.

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Solar-driven interfacial water evaporation has attracted increasing interest because of its high photothermal conversion efficiency. However, a big challenge still remains as salt crystallization is a bottleneck issue that hinders their practical solar desalination applicability. Herein, we demonstrate a strategy for construction of a salt-rejection solar steam generation system by designing a migration crystallization device (MCD) using superhydrophilic carbonized green algae (SH-CGA) as photothermal materials. By a surface modification, the SH-CGA shows a superhydrophilic wettability which facilitates fast water transportation, in combination with its low thermal conductivity of 0.042 W m −1 K −1 , high light absorption (98∼100%), and abundant porosity. The prepared SH-CGA exhibits a high evaporation rate of 1.35 kg m −2 h −1 and conversion efficiency of 83% under 1 kW m −2 illumination. Interestingly, we designed a simple MCD by adding a cotton thread into the margin of SH-CGA for preventing surface crystallization. No obvious salt accumulation was observed after 15 d continuous operation at real sunlight irradiation, and the device realizes the simultaneous collection of salt (24.26 g of NaCl crystallization) and water. This result may provide a novel and versatile way for creation of salt-rejection solar steam generation systems with great potential for practical solar desalination.

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“…However, long exposures of MoS 2 to UV-O 3 have also been found to oxidize the Mo, which compromises the MoS 2 [37,54]. In this work, the process developed by Azcatl As shown in Fig.…”

Section: Hzo Atomic Layer Deposition Efficacymentioning

confidence: 88%

“…TiN) [19], doing so would require transfer of the TMDC onto the HZO after the HZO is prepared. It is known that transfer processes introduce contaminants by leaving behind residues that could affect the interface and device properties [33][34][35][36][37]. Thus, in this work, we directly grow HZO on TMDCs through ALD, and show differences in the efficacy of the ALD process depending on the TMDC and its functionalization.…”

Section: Introductionmentioning

confidence: 90%

Thermal stability of hafnium zirconium oxide on transition metal dichalcogenides

Sales

Jaszewski

Fields

et al. 2021

Applied Surface Science

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MoS2 cleaning by acetone and UV-ozone: Geological and synthetic material

Cited by 10 publications

References 25 publications

Solvent-Free Preparation of Closely Packed MoS₂ Nanoscrolls for Improved Photosensitivity

Solvent-Free Preparation of Closely Packed MoS₂ Nanoscrolls for Improved Photosensitivity

Migration Crystallization Device Based on Biomass Photothermal Materials for Efficient Salt-Rejection Solar Steam Generation

Thermal stability of hafnium zirconium oxide on transition metal dichalcogenides

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MoS2 cleaning by acetone and UV-ozone: Geological and synthetic material

Cited by 10 publications

References 25 publications

Solvent-Free Preparation of Closely Packed MoS2 Nanoscrolls for Improved Photosensitivity

Solvent-Free Preparation of Closely Packed MoS2 Nanoscrolls for Improved Photosensitivity

Migration Crystallization Device Based on Biomass Photothermal Materials for Efficient Salt-Rejection Solar Steam Generation

Thermal stability of hafnium zirconium oxide on transition metal dichalcogenides

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Product

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Solvent-Free Preparation of Closely Packed MoS₂ Nanoscrolls for Improved Photosensitivity

Solvent-Free Preparation of Closely Packed MoS₂ Nanoscrolls for Improved Photosensitivity