Multimodality of Structural, Electrical, and Gravimetric Responses of Intercalated MXenes to Water | Zendy

Eric S. Muckley | Zendy; Michael Naguib | Zendy; HsiuWen Wang | Zendy; Lukáš Vlček | Zendy; Naresh C. Osti | Zendy; Robert L. Sacci | Zendy; Xiahan Sang | Zendy; Raymond R. Unocic | Zendy; Yu Xie | Zendy; Madhusudan Tyagi | Zendy; Eugene Mamontov | Zendy; Katharine Page | Zendy; Paul R. C. Kent | Zendy; Jagjit Nanda | Zendy; Ilia N. Ivanov | Zendy

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Multimodality of Structural, Electrical, and Gravimetric Responses of Intercalated MXenes to Water

Author(s) -

Eric S. Muckley,

Michael Naguib,

HsiuWen Wang,

Lukáš Vlček,

Naresh C. Osti,

Robert L. Sacci,

Xiahan Sang,

Raymond R. Unocic,

Yu Xie,

Madhusudan Tyagi,

Eugene Mamontov,

Katharine Page,

Paul R. C. Kent,

Jagjit Nanda,

Ilia N. Ivanov

Publication year - 2017

Publication title -

acs nano

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.554

H-Index - 382

eISSN - 1936-086X

pISSN - 1936-0851

DOI - 10.1021/acsnano.7b05264

Subject(s) - mxenes , gravimetric analysis , materials science , relative humidity , dopant , water vapor , humidity , chemical physics , analytical chemistry (journal) , chemical engineering , nanotechnology , chemistry , optoelectronics , doping , thermodynamics , organic chemistry , physics , engineering

Understanding of structural, electrical, and gravimetric peculiarities of water vapor interaction with ion-intercalated MXenes led to design of a multimodal humidity sensor. Neutron scattering coupled to molecular dynamics and ab initio calculations showed that a small amount of hydration results in a significant increase in the spacing between MXene layers in the presence of K and Mg intercalants between the layers. Films of K- and Mg-intercalated MXenes exhibited relative humidity (RH) detection thresholds of ∼0.8% RH and showed monotonic RH response in the 0-85% RH range. We found that MXene gravimetric response to water is 10 times faster than their electrical response, suggesting that H 2 O-induced swelling/contraction of channels between MXene sheets results in trapping of H 2 O molecules that act as charge-depleting dopants. The results demonstrate the use of MXenes as humidity sensors and infer potential impact of water on structural and electrical performance of MXene-based devices.

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