Increasing the efficiency of mechanically exfoliating 1T-CrTe2 flakes using the "Easy-Peel" process
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Ambal, Kapildeb
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Abstract
1T-CrTe2 is a room-temperature van der Waals ferromagnet with a Curie temperature (Tc) ? 300 K [1]. This, along with its perpendicular magnetic easy axis for ultrathin thicknesses (< 10 nm) [1], makes 1T-CrTe2 applicable in high-density data storage devices and spintronics. Mechanical exfoliation of 1T-CrTe2 has been shown to be the best method to create large, thin flakes from bulk material. However, producing thin flakes large enough for application is difficult as residual K from KCrTe2 hampers the separation of Te-Cr-Te layers. We present current progress in the development of the "Easy-Peel" method to remove residual K from 1T-CrTe2. Stochiometric amounts of K, Cr, and Te were first sealed under argon in a quartz tube and heated. The resultant KCrTe2 was then stirred in acetonitrile with 0.2g I2 and separated using vacuum filtration. The 1T-CrTe2 was then subjected to additional I2 treatment using the "Easy-Peel" method. Bulk pieces were then mechanically exfoliated using clean tape. The exfoliate was then transferred to a charged glass slide and imaged using optical microscopy. These images were processed using ImageJ image processing software, and each flake's area, length, and breadth were determined. Current statistics demonstrate roughly a 2 times increase in area and breadth between "Non-Easy-Peel" and "Easy-Peel" 1T-CrTe2 prepared under ambient conditions but little difference when prepared under inert conditions. This implies that "Easy-Peel" 1T-CrTe2 is less brittle under ambient conditions, which is consistent with the idea that residual K has been removed. [1] X. Zhang, et al., Nat Comm.12, 2492 (2021).