Abstract

Although some of the 2D layered materials like graphene and h-BN are stable in ambient condition, many other ones like the magnetic metal halogens CrI3 might degrade quickly in air due to oxidation or hydrolyzation that drastically affect the intrinsic properties of the pristine samples. Thus, a clean environment is highly demanded for such sensitive 2D materials during storage or transferring between synthesis and characterization setups. Additionally, variable sample temperature is crucial for characterization as well. Here, we demonstrate a specially designed vacuum suitcase that meet these challenges. It utilizes power-free non-evaporable getter pump to provide the ultra-clean vacuum environment for up to 5 samples, which could be maintained at 10−8 mbar level for 5 h and 10−7 mbar level for more 20 days. One of the samples is stored on a liquid nitrogen cooled (∼80 K–300 K) cryogenic stage, which is optimized for optical characterizations (Raman spectroscopy etc.) through a glass window. Such power-free vacuum suitcases would facilitate the clean environment sample transfer and variable temperature optical characterization of as grown sensitive 2D materials.

Full Text
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