title: A rational design of cosolvent exfoliation of layered materials by directly probing liquid-solid interaction.
abstract: Exfoliation of layered materials such as graphite and transition metal dichalcogenides into mono- or few-layers is of significant interest for both the fundamental studies and potential applications. Here we report a systematic investigation of the fundamental factors governing the liquid exfoliation process and the rational design of a cosolvent approach for the exfoliation of layered materials. We show that Young's equation can be used to predict the optimal cosolvent concentration for the effective exfoliation of graphite and molybdenum disulphide in water mixtures with methanol, ethanol, isopropanol and t-butyl alcohol. Moreover, we find that the cosolvent molecular size has an important role in the exfoliation yield, attributed to the larger steric repulsion provided by the larger cosolvent molecules. Our study provides critical insight into the exfoliation of layered materials, and defines a rational strategy for the design of an environmentally friendly pathway to the high yield exfoliation of layered materials.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.
authors.forename: Udayabagya
authors.initials: U
authors.lastname: Halim
authors.forename: Chu Ran
authors.initials: CR
authors.lastname: Zheng
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Lin
authors.forename: Shan
authors.initials: S
authors.lastname: Jiang
authors.forename: Rui
authors.initials: R
authors.lastname: Cheng
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
references.citation: Angew Chem Int Ed Engl. 2011 Nov 11;50(46):10839-42
references.pmid: 21954121
references.citation: Nature. 2002 Apr 25;416(6883):829-32
references.pmid: 11976678
references.citation: J Am Chem Soc. 2011 Aug 17;133(32):12810-23
references.pmid: 21736367
references.citation: Proc Natl Acad Sci U S A. 2005 Jul 26;102(30):10451-3
references.pmid: 16027370
references.citation: AAPS PharmSciTech. 2008;9(2):366-76
references.pmid: 18431671
references.citation: Nano Lett. 2010 Apr 14;10(4):1144-8
references.pmid: 20199057
references.citation: Int J Occup Med Environ Health. 2008;21(1):73-80
references.pmid: 18468972
references.citation: J Am Chem Soc. 2010 Oct 20;132(41):14638-48
references.pmid: 20879739
references.citation: Nat Nanotechnol. 2008 Sep;3(9):538-42
references.pmid: 18772914
references.citation: Angew Chem Int Ed Engl. 2011 Nov 18;50(47):11093-7
references.pmid: 22021163
references.citation: Phys Rev Lett. 2010 Sep 24;105(13):136805
references.pmid: 21230799
references.citation: Nat Nanotechnol. 2008 Feb;3(2):101-5
references.pmid: 18654470
references.citation: Langmuir. 2010 May 18;26(10):7216-26
references.pmid: 20380474
references.citation: Nat Nanotechnol. 2008 Sep;3(9):563-8
references.pmid: 18772919
references.citation: ACS Nano. 2010 Jun 22;4(6):3201-8
references.pmid: 20441213
references.citation: Nat Mater. 2007 Mar;6(3):183-91
references.pmid: 17330084
references.citation: Science. 2011 Feb 4;331(6017):568-71
references.pmid: 21292974
references.citation: J Am Chem Soc. 2010 Dec 22;132(50):17661-3
references.pmid: 21114312
references.citation: Nat Mater. 2013 Mar;12(3):246-52
references.pmid: 23241535
references.citation: Phys Chem Chem Phys. 2010 Nov 28;12(44):14789-97
references.pmid: 20949141
references.citation: J Am Chem Soc. 2011 May 18;133(19):7296-9
references.pmid: 21510646
references.citation: Nat Nanotechnol. 2009 Apr;4(4):217-24
references.pmid: 19350030
references.citation: Nat Nanotechnol. 2011 Jun 26;6(7):439-45
references.pmid: 21706026
references.citation: Adv Mater. 2012 Nov 14;24(43):5782-825
references.pmid: 22930422