Universal Ligands for Dispersion of Two-Dimensional MXene in Organic Solvents

Authors
Ko, Tae YunKim, Dae sinKim, Seon JoonKim, Hye RimNissimagoudar, Arun S.Lee, Seung CheolLin, XiaoboCummings, Peter T.Doo, SehyunPark, SeongminTufail HassanOh, TaegonChae, AriLee, JihoonGogotsi, YuryIn, InsikKoo, Chong Min
Issue Date
2023-01
Publisher
American Chemical Society
Citation
ACS Nano, v.17, no.2, pp.1112 - 1119
Abstract
Ligands can control the surface chemistry, physicochemical properties, processing, and applications of nanomaterials. MXenes are the fastest growing family of two-dimensional (2D) nanomaterials, showing promise for energy, electronic, and environmental applications. However, complex oxidation states, surface terminal groups, and interaction with the environment have hindered the development of organic ligands suitable for MXenes. Here, we demonstrate a simple, fast, scalable, and universally applicable ligand chemistry for MXenes using alkylated 3,4-dihydroxy-L-phenylalanine (ADOPA). Due to the strong hydrogen-bonding and pi-electron interactions between the catechol head and surface terminal groups of MXenes and the presence of a hydrophobic fluorinated alkyl tail compatible with organic solvents, the ADOPA ligands functionalize MXene surfaces under mild reaction conditions without sacrificing their properties. Stable colloidal solutions and highly concentrated liquid crystals of various MXenes, including Ti2CTx, Nb2CTx, V2CTx, Mo2CTx, Ti3C2Tx, Ti3CNTx, Mo2TiC2Tx, Mo2Ti2C3Tx, and Ti4N3Tx, have been produced in various organic solvents. Such products offer excellent electrical conductivity, improved oxidation stability, and excellent processability, enabling applications in flexible electrodes and electromagnetic interference shielding.
Keywords
METAL; NANOCRYSTALS; OXIDATION; FILMS; two-dimensional (2D) materials; MXene; ligand chemistry; surface functionalization; organic dispersion; electrically conductive MXene organic ink
ISSN
1936-0851
URI
https://pubs.kist.re.kr/handle/201004/75864
DOI
10.1021/acsnano.2c08209
Appears in Collections:
KIST Article > 2023
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