Raman Spectroscopy, Photocatalytic Degradation, and Stabilization of Atomically Thin Chromium Tri-iodide.
basic_science · Level V
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- Record sourced from PubMed, PMID 29863369.
- Also identified by DOI 10.1021/acs.nanolett.8b01131.
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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<sub>3</sub>-based devices and heterostructures is challenging due to its extreme instability under ambient conditions. Here, we present Raman characterization of CrI<sub>3</sub> and demonstrate that the main degradation pathway of CrI<sub>3</sub> is the photocatalytic substitution of iodine by water. While simple encapsulation by Al<sub>2</sub>O<sub>3</sub>, PMMA, and hexagonal BN (hBN) only leads to modest reduction in degradation rate, minimizing light exposure markedly improves stability, and CrI<sub>3</sub> sheets sandwiched between hBN layers are air-stable for >10 days. By monitoring the transfer characteristics of the CrI<sub>3</sub>/graphene heterostructure over the course of degradation, we show that the aquachromium solution hole-dopes graphene.