Multiscale molecular thermodynamics of graphene-oxide liquid-phase exfoliation

2019 ◽  
Vol 21 (4) ◽  
pp. 1761-1772 ◽  
Author(s):  
Amir A. Farajian ◽  
Reza Mortezaee ◽  
Tim H. Osborn ◽  
Olga V. Pupysheva ◽  
Michael Wang ◽  
...  
Keyword(s):  
Free Energy ◽  
Graphene Oxide ◽  
Liquid Phase ◽  
Multiscale Modeling ◽  
Molecular Thermodynamics ◽  
2D Nanomaterials ◽  
Liquid Phase Exfoliation

Thermodynamics of 2D nanomaterials exfoliation in solution are analyzed by considering parallel, perpendicular, and edge routes for graphene-oxide as an example. Multiscale modeling is used to quantitatively assess and compare free energy changes for various surface coverages.

Graphene Oxide-Assisted Liquid Phase Exfoliation of Graphite into Graphene for Highly Conductive Film and Electromechanical Sensors

2016 ◽  
Vol 8 (25) ◽  
pp. 16521-16532 ◽  
Author(s):  
Tran Thanh Tung ◽  
Jeongha Yoo ◽  
Faisal K. Alotaibi ◽  
Md J. Nine ◽  
Ramesh Karunagaran ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Phase ◽  
Conductive Film ◽  
Liquid Phase Exfoliation ◽  
Electromechanical Sensors

Liquid-phase exfoliation of black sesame to create a nanoplatform for in vitro photoluminescence and photothermal therapy

Nanomedicine ◽  
2020 ◽  
Vol 15 (21) ◽  
pp. 2041-2052
Author(s):  
Zhongjian Xie ◽  
Ruitao Lu ◽  
Yao Zhu ◽  
Minhua Peng ◽  
Taojian Fan ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Cancer Therapy ◽  
Photothermal Therapy ◽  
Organic Materials ◽  
2D Materials ◽  
The Family ◽  
2D Nanomaterials ◽  
Liquid Phase Exfoliation ◽  
Cellulose Nanosheets

Aim: The present study aims to apply the facile liquid-phase exfoliation (LPE) strategy to fabricate 2D organic materials and thus to broaden the family of biocompatible and multifunctional 2D materials. Materials & methods: 2D material-organic melanin and cellulose nanosheets were synthesized from black sesame hull using LPE. Photoluminescence and photothermal properties of the nanosheets were assessed, as well as stability and cell killing ability. Results: The prepared 2D nanoplatform exhibited broad and multiple photoluminescent emission bands. It also demonstrated efficient photothermal cancer therapy with excellent biocompatibility. Conclusion: The present study could open an avenue in exfoliating organic materials using the LPE strategy. This could make the fabrication of multifunctional 2D organic materials more efficient and broaden the family of biocompatible 2D nanomaterials.

scholarly journals KAJIAN AWAL SIFAT OPTIK GRAPHENE OXIDE BERBAHAN DASAR ARANG TONGKOL JAGUNG YANG DISINTESIS DENGAN METODE LIQUID PHASE EXFOLIATION (LPE)

2019 ◽  
Vol 4 (2) ◽  
pp. 114-120
Author(s):  
Yuditha Ignasia Bete ◽  
Minsyahril Bukit ◽  
Albert Zicko Johannes ◽  
Redi K. Pingak
Keyword(s):  
Absorption Spectrum ◽  
Graphene Oxide ◽  
Liquid Phase ◽  
Mass Variation ◽  
Minimum Value ◽  
Mass Absorption ◽  
Maximum Value ◽  
Double Beam ◽  
Liquid Phase Exfoliation

Abstrak Telah dilakukan penelitian tentang kajian awal sifat optik  Graphene Oxide  berbahan dasar arang tongkol jagung yang disintesis dengan metode Liquid Phase Exfoliation  (LPE). Penelitian ini bertujuan mengetahui pengaruh variasi massa karbon tongkol jagung dengan variasi 1 gram; 1,5 gram; 2 gram, pengaruh perlakuan blender, ultrasonikasi, dan blender + ultrasonikasi terhadap nilai absorbansi UV-Vis Graphene Oxide hasil sintesis. Karbon tongkol jagung yang dibakar dihaluskan sampai menjadi serbuk, disintesis dengan bantuan blender, ultrasonifikasi dan blender + ultrasonifikasi selama 3 jam, didiamkan selama satu malam, kemudian diencerkan dengan menggunakan pelarut aquades. Selanjutnya hasil sintesis tersebut dikarakterisasi menggunakan Spektrometer UV-Vis double beam untuk mendapatkan spektrum absorbansinya. Berdasarkan hasil analisis spektrum absorbansi pada masing – masing variasi massa, pada perlakuan ultrasonifikasi nilai absorbansi meningkat secara linear seiring bertambahnya massa. Nilai absorbansi untuk variasi massa 1 gram, 1,5 gram dan 2 gram secara berturut-turut diperoleh sebesar 1,710 ; 2,071 ; 1,483 untuk perlakuan blender, 1,478 ; 1,571; 1,588 untuk perlakuan ultasonikasi, dan 1,574 ; 1,450 ; 1,547 untuk perlakuan blender+ultrasonikasi. Dengan metode Liquid Phase Exfolition diperoleh nilai absorbansi maksimum pada perlakuan blender massa 1,5 gram dengan nilai 2,071 dan nilai absorbansi minimum diperoleh pada perlakuan dengan blender + ultrasonifikasi massa 1,5 gram dengan nilai 1,450. Berdasarkan nilai absorbansi tersebut larutan sampel hasil sintesis termasuk Graphene Oxide. Kata-kata kunci: Graphene Oxide; LPE; Spektrum absorbansi; Spektrofotometer UV –Vis; Tongkol jagung.   Abstract  The aim of this work is to investigate the effects of varying corncob mass (1 gr; 1,5 gr; 2 gr) and varying treatments including blender, ultrasonification, and blender + ultrasonication on the UV-Vis spectrum of Graphene Oxide synthesized from the corncob. The corncobs that have been burned were powdered, synthesized using blender, ultrasonification and blender + ultrasonification for 3 hours, left overnight, and then diluted using aquades. Then, the synthesis results were characterized using UV-Vis double beam spectrophotometer. From the analysis of the absorption spectrum, the absorption values from ultrasonification treatments, the absorption values were linearly proportional to the mass. Absorption values for mass variation of 1 gram, 1,5 gram and 2 gram were 1,710 ; 2,071 ; 1,483 using blender treatment, 1,478 ; 1,571; 1,588 using ultrasonification treatment, and 1,574 ; 1,450 ; 1,547 using blender+ultrasonification treatment. With Liquid Phase Exfoliation, the maximum value of absorbance was found at 1,5 gram mass variation using blender treatment, with the value being 2,071 and the minimum value of the was found when using blender + ultrasonification treatment at 1,5-gram mass variation, with the minimun value being 1,450. From the absoption values, Graphene Oxide has been succesfully sinthesized from the corncob. Keywords: Graphene Oxide; LPE; Absorption Spectrum; UV–Vis Spectrophotometer; Corncob.

Small size graphene oxide (GO) as hole injection layer for high-performance green phosphorescent organic light-emitting diodes

2021 ◽  
Author(s):  
Yanqin Miao ◽  
Mengna Yin ◽  
Chengqiang Wang ◽  
Xiaozhen Wei ◽  
Zhiyuan Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Phase ◽  
Work Function ◽  
Size Distribution ◽  
High Performance ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Organic Light ◽  
Liquid Phase Exfoliation

In this work, we successfully synthesized small size GO with main size distribution at 200~400 nm by using the tip sonication-assisted liquid-phase exfoliation method, which shows suitable work function of...

scholarly journals High-Yield Production of Selected 2D Materials by Understanding Their Sonication-Assisted Liquid-Phase Exfoliation

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3253
Author(s):  
Freskida Goni ◽  
Angela Chemelli ◽  
Frank Uhlig
Keyword(s):  
Liquid Phase ◽  
Large Scale ◽  
High Yield ◽  
Scale Production ◽  
Yield Production ◽  
Large Scale Production ◽  
2D Nanomaterials ◽  
Liquid Phase Exfoliation ◽  
Molybdenum Disulfide Nanosheets ◽  
High Yield Production

Liquid-phase exfoliation (LPE) is a widely used and promising method for the production of 2D nanomaterials because it can be scaled up relatively easily. Nevertheless, the yields achieved by this process are still low, ranging between 2% and 5%, which makes the large-scale production of these materials difficult. In this report, we investigate the cause of these low yields by examining the sonication-assisted LPE of graphene, boron nitride nanosheets (BNNSs), and molybdenum disulfide nanosheets (MoS2 NS). Our results show that the low yields are caused by an equilibrium that is formed between the exfoliated nanosheets and the flocculated ones during the sonication process. This study provides an understanding of this behaviour, which prevents further exfoliation of nanosheets. By avoiding this equilibrium, we were able to increase the total yields of graphene, BNNSs, and MoS2 NS up to 14%, 44%, and 29%, respectively. Here, we demonstrate a modified LPE process that leads to the high-yield production of 2D nanomaterials.

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.

Sign in / Sign up

Export Citation Format

Share Document