The electrochemistry of size dependent graphene via liquid phase exfoliation: capacitance and ionic transport

2021 ◽  
Author(s):  
Varisara Deerattrakul ◽  
Wisit Hirunpinyopas ◽  
Nuttapon Pisitpipathsin ◽  
Thanit Saisopa ◽  
Montree Sawangphruk ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Transport Properties ◽  
Ionic Transport ◽  
Size Dependent ◽  
Centrifugation Technique ◽  
Liquid Phase Exfoliation

This work explores the capacitance and ionic transport properties of size dependent graphene (from 100 nm to 1 μm) prepared through the liquid phase exfoliation of graphite in which the size of graphene was finely selected using a multi-step centrifugation technique.

scholarly journals Optimized Liquid-Phase Exfoliation of Magnetic van der Waals Heterostructures: Towards the Single Layer and Deterministic Fabrication of Devices

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7371
Author(s):  
Lucía Martín-Pérez ◽  
Enrique Burzurí
Keyword(s):  
Electron Transport ◽  
Liquid Phase ◽  
Transport Properties ◽  
Magnetic Materials ◽  
Large Scale ◽  
Field Effect Transistors ◽  
Van Der Waals ◽  
Device Fabrication ◽  
Electron Transport Properties ◽  
Liquid Phase Exfoliation

Van der Waals magnetic materials are promising candidates for spintronics and testbeds for exotic magnetic phenomena in low dimensions. The two-dimensional (2D) limit in these materials is typically reached by mechanically breaking the van der Waals interactions between layers. Alternative approaches to producing large amounts of flakes rely on wet methods such as liquid-phase exfoliation (LPE). Here, we report an optimized route for obtaining monolayers of magnetic cylindrite by LPE. We show that the selection of exfoliation times is the determining factor in producing a statistically significant amount of monolayers while keeping relatively big flake areas (~1 µm2). We show that the cylindrite lattice is preserved in the flakes after LPE. To study the electron transport properties, we have fabricated field-effect transistors based on LPE cylindrite. Flakes are deterministically positioned between nanoscale electrodes by dielectrophoresis. We show that dielectrophoresis can selectively move the larger flakes into the devices. Cylindrite nanoscale flakes present a p-doped semiconducting behaviour, in agreement with the mechanically exfoliated counterparts. Alternating current (AC) admittance spectroscopy sheds light on the role played by potential barriers between different flakes in terms of electron transport properties. The present large-scale exfoliation and device fabrication strategy can be extrapolated to other families of magnetic materials.

Transport properties of porous γ-alumina from diffusion in liquids and gases

1988 ◽  
Vol 53 (6) ◽  
pp. 1217-1228
Author(s):  
Petr Uchytil ◽  
Petr Schneider
Keyword(s):  
Liquid Phase ◽  
Pore Structure ◽  
Transport Properties ◽  
Gas Diffusion ◽  
Diffusion In Liquids

Transport characteristics of four porous samples with bidisperse or broad monodisperse pore structure were determined by combination of diffusion and permeation measurements with simple gases and compared with results obtained from diffusion of toluene or α,α,α-trifluorotoluene in cyclohexane in liquid phase. From comparison of both types of results it followed that all pores are decisive for the rate of diffusional transport in liquids, whereas only the wide transport pores are significant in gas diffusion.

scholarly journals Liquid-Phase Synthesis, Sintering, and Transport Properties of Nanoparticle-Based Boron-Rich Composites

2021 ◽  
Author(s):  
Guillaume Gouget ◽  
Damien Bregiroux ◽  
Rémi Grosjean ◽  
David Montero ◽  
Stefan Maier ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Transport Properties ◽  
Phase Synthesis

System Size-Dependent Transport Properties in Materials of Nanoscale Dimension

2021 ◽  
Vol 125 (12) ◽  
pp. 6963-6974
Author(s):  
Ravi C. Dutta ◽  
Christian C. Zuluaga-Bedoya ◽  
Suresh K. Bhatia
Keyword(s):  
Transport Properties ◽  
System Size ◽  
Size Dependent ◽  
Dependent Transport

PbSe Nanocrystals Produced by Facile Liquid Phase Exfoliation for Efficient UV–Vis Photodetectors

2021 ◽  
Vol 31 (17) ◽  
pp. 2010401
Author(s):  
Lingfeng Gao ◽  
Rui Wang ◽  
Artem V. Kuklin ◽  
Han Zhang ◽  
Hans Ågren
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Exfoliation

Green Solvents for the Liquid-Phase Exfoliation of Biochars

2021 ◽  
Author(s):  
Juliana L. Vidal ◽  
Stephanie M. V. Gallant ◽  
Evan P. Connors ◽  
Douglas D. Richards ◽  
Stephanie L. MacQuarrie ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Green Solvents ◽  
Liquid Phase Exfoliation

scholarly journals Impact of Pretreatment of the Bulk Starting Material on the Efficiency of Liquid Phase Exfoliation of WS2

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1072
Author(s):  
Steffen Ott ◽  
Melanie Lakmann ◽  
Claudia Backes
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Aspect Ratio ◽  
Optical Quality ◽  
Starting Material ◽  
Binding Strength ◽  
Photoluminescence Quantum Yield ◽  
Out Of Plane ◽  
Liquid Phase Exfoliation ◽  
Pretreatment Conditions

Liquid phase exfoliation (LPE) is widely used to produce colloidal dispersions of nanomaterials, in particular two-dimensional nanosheets. The degree of exfoliation, i.e., the length to thickness aspect ratio was shown to be intrinsically limited by the ratio of in-plane to out-of-plane binding strength. In this work, we investigate whether simple pretreatment of the starting material can be used to change the in-plane to out-of-plane binding strength through mild intercalation to improve the sample quality in sonication-assisted LPE. Five different pretreatment conditions of WS2 were tested and the dispersions size-selected through centrifugation. From optical spectroscopy (extinction, Raman, photoluminescence), information on nanosheet dimension (average lateral size, layer number, monolayer size) and optical quality (relative photoluminescence quantum yield) was extracted. We find that the pretreatment has a minor impact on the length/thickness aspect ratio, but that photoluminescence quantum yield can be increased in particular using mild sonication conditions. We attribute this to the successful exfoliation of nanosheets with a lower degree of basal plane defectiveness. This work emphasizes the complexity of the exfoliation process and suggests that the role of defects has to be considered for a comprehensive picture.

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