Cyclododecane-based high-intactness and clean transfer method for fabricating suspended two-dimensional materials.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39138222.
- Also identified by DOI 10.1038/s41467-024-51331-8 and PMC identifier 11322315.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The high-intactness and ultraclean fabrication of suspended 2D materials has always been a challenge due to their atomically thin nature. Here, we present a universal polymer-free transfer approach for fabricating suspended 2D materials by using volatile micro-molecule cyclododecane as the transfer medium, thus ensuring the ultraclean and intact surface of suspended 2D materials. For the fabricated monolayer suspended graphene, the intactness reaches 99% for size below 10 µm and suspended size reaches 36 µm. Owing to the advantages of ultra-cleanness and large size, the thermal conductivity reaches 4914 <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>W</mi> <mspace></mspace> <msup><mrow><mi>m</mi></mrow> <mrow><mo>-</mo> <mn>1</mn></mrow> </msup> <msup><mrow><mi>K</mi></mrow> <mrow><mo>-</mo> <mn>1</mn></mrow> </msup> </math> at 338 K. Moreover, this strategy can also realize efficient batch transfer of suspended graphene and is applicable for fabricating other 2D suspended materials such as MoS<sub>2</sub>. Our research not only establishes foundation for potential applications and investigations of intrinsic properties of large-area suspended 2D materials, but also accelerates the wide applications of suspended graphene grid in ultrahigh-resolution TEM characterization.