Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide

D. Shcherbakov, P. Stepanov, D. Weber, Y. Wang, J. Hu, Y. Zhu, K. Watanabe, T. Taniguchi, Z. Mao, W. Windl, J. Goldberger, M. Bockrath, C.N. Lau

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium tri-iodide is the latest addition to the family of two-dimensional (2D) materials. However, realistic exploration of CrI 3 -based devices and heterostructures is challenging due to its extreme instability under ambient conditions. Here, we present Raman characterization of CrI 3 and demonstrate that the main degradation pathway of CrI 3 is the photocatalytic substitution of iodine by water. While simple encapsulation by Al 2 O 3 , PMMA, and hexagonal BN (hBN) only leads to modest reduction in degradation rate, minimizing light exposure markedly improves stability, and CrI 3 sheets sandwiched between hBN layers are air-stable for >10 days. By monitoring the transfer characteristics of the CrI 3 /graphene heterostructure over the course of degradation, we show that the aquachromium solution hole-dopes graphene. \ 2018 American Chemical Society.
Original languageEnglish
Pages (from-to)4214-4219
Number of pages6
JournalNano letters
Volume18
Issue number7
DOIs
StatePublished - 2018

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Iodides
Chromium
iodides
Raman spectroscopy
chromium
Graphite
Stabilization
stabilization
degradation
Degradation
Graphene
Heterojunctions
graphene
dopes
Polymethyl Methacrylate
Iodine
Encapsulation
iodine
Magnetization
Substitution reactions

Cite this

Shcherbakov, D. ; Stepanov, P. ; Weber, D. ; Wang, Y. ; Hu, J. ; Zhu, Y. ; Watanabe, K. ; Taniguchi, T. ; Mao, Z. ; Windl, W. ; Goldberger, J. ; Bockrath, M. ; Lau, C.N. / Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide. In: Nano letters. 2018 ; Vol. 18, No. 7. pp. 4214-4219.
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abstract = "As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium tri-iodide is the latest addition to the family of two-dimensional (2D) materials. However, realistic exploration of CrI 3 -based devices and heterostructures is challenging due to its extreme instability under ambient conditions. Here, we present Raman characterization of CrI 3 and demonstrate that the main degradation pathway of CrI 3 is the photocatalytic substitution of iodine by water. While simple encapsulation by Al 2 O 3 , PMMA, and hexagonal BN (hBN) only leads to modest reduction in degradation rate, minimizing light exposure markedly improves stability, and CrI 3 sheets sandwiched between hBN layers are air-stable for >10 days. By monitoring the transfer characteristics of the CrI 3 /graphene heterostructure over the course of degradation, we show that the aquachromium solution hole-dopes graphene. \ 2018 American Chemical Society.",
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Shcherbakov, D, Stepanov, P, Weber, D, Wang, Y, Hu, J, Zhu, Y, Watanabe, K, Taniguchi, T, Mao, Z, Windl, W, Goldberger, J, Bockrath, M & Lau, CN 2018, 'Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide', Nano letters, vol. 18, no. 7, pp. 4214-4219. https://doi.org/10.1021/acs.nanolett.8b01131

Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide. / Shcherbakov, D.; Stepanov, P.; Weber, D.; Wang, Y.; Hu, J.; Zhu, Y.; Watanabe, K.; Taniguchi, T.; Mao, Z.; Windl, W.; Goldberger, J.; Bockrath, M.; Lau, C.N.

In: Nano letters, Vol. 18, No. 7, 2018, p. 4214-4219.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide

AU - Shcherbakov, D.

AU - Stepanov, P.

AU - Weber, D.

AU - Wang, Y.

AU - Hu, J.

AU - Zhu, Y.

AU - Watanabe, K.

AU - Taniguchi, T.

AU - Mao, Z.

AU - Windl, W.

AU - Goldberger, J.

AU - Bockrath, M.

AU - Lau, C.N.

N1 - cited By 3

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Y1 - 2018

N2 - As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium tri-iodide is the latest addition to the family of two-dimensional (2D) materials. However, realistic exploration of CrI 3 -based devices and heterostructures is challenging due to its extreme instability under ambient conditions. Here, we present Raman characterization of CrI 3 and demonstrate that the main degradation pathway of CrI 3 is the photocatalytic substitution of iodine by water. While simple encapsulation by Al 2 O 3 , PMMA, and hexagonal BN (hBN) only leads to modest reduction in degradation rate, minimizing light exposure markedly improves stability, and CrI 3 sheets sandwiched between hBN layers are air-stable for >10 days. By monitoring the transfer characteristics of the CrI 3 /graphene heterostructure over the course of degradation, we show that the aquachromium solution hole-dopes graphene. \ 2018 American Chemical Society.

AB - As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium tri-iodide is the latest addition to the family of two-dimensional (2D) materials. However, realistic exploration of CrI 3 -based devices and heterostructures is challenging due to its extreme instability under ambient conditions. Here, we present Raman characterization of CrI 3 and demonstrate that the main degradation pathway of CrI 3 is the photocatalytic substitution of iodine by water. While simple encapsulation by Al 2 O 3 , PMMA, and hexagonal BN (hBN) only leads to modest reduction in degradation rate, minimizing light exposure markedly improves stability, and CrI 3 sheets sandwiched between hBN layers are air-stable for >10 days. By monitoring the transfer characteristics of the CrI 3 /graphene heterostructure over the course of degradation, we show that the aquachromium solution hole-dopes graphene. \ 2018 American Chemical Society.

U2 - 10.1021/acs.nanolett.8b01131

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VL - 18

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JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

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