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Low temperature solution synthesis of reduced two dimensional Ti3C2 MXenes with paramagnetic behaviour

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Title
Low temperature solution synthesis of reduced two dimensional Ti3C2 MXenes with paramagnetic behaviour
Author(s)
Yeoheung Yoon; Thi Anh Le; Anand P. Tiwari; Ikjoon Kim; Michel W. Barsoum; Hyoyoung Lee
Publication Date
2018-12
Journal
NANOSCALE, v.10, no.47, pp.22429 - 22438
Publisher
ROYAL SOC CHEMISTRY
Abstract
MXenes - two dimensional, 2D, early transition metal, M, carbides and nitrides, X - are the latest addition to the 2D materials' world. Herein, we report on a facile low temperature solution chemical synthesis method to reduce Ti3C2Tx multilayered, ML, MXenes. Using X-ray photoelectron spectroscopy, electron spin resonance, magnetization measurements and other techniques, we concluded that immersing Ti3C2Tx MLs in the reducing agent Li-ethylenediamine (Li-EDA) - held at temperatures varying from room to 120 degrees C - reduces the 2D layers creating Ti3+ ions and oxygen vacancies. Above a temperature (T) of approximate to 10 K, the magnetic susceptibilities, , are temperature independent, implying that the resulting powders are Pauli paramagnetic. The loss of the magnetic signal upon intercalation of Li+ or EDA, together with a Curie-like increase in at T < 10 K, is consistent with that of a disordered metal that is close to a metallic to insulator transition and proves that the magnetism is associated with the 2D flakes. This result is the first evidence of any magnetism of any MXene. © The Royal Society of Chemistry 2018
URI
https://pr.ibs.re.kr/handle/8788114/5915
DOI
10.1039/c8nr06854b
ISSN
2040-3364
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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