Cyclododecane-based high-intactness and clean transfer method for fabricating suspended two-dimensional materials
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Nature Publishing Group UK
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Acknowledgements: This work was financially supported by the National Key Research and Development Program of China (2022YFA1204900, L.L. and H.P.), the Talent Foundation of Northwest Agriculture & Forest University (Z1013023003, Z.W., Z1013023002, W.L.), the National Natural Science Foundation of China (52372038, L.L., T2188101, Z.L., 52021006, H.P., 12202430, G.W., 12241202, G.W. and 22105006, Y.S.), and the Fundamental Research Funds for the Central Universities (2452024094, Z.W., 2452024090, W.L.). The authors acknowledge the Molecular Materials and Nanofabrication Laboratory (MMNL) in the College of Chemistry at Peking University for the use of instruments.
Funder: National Key Research and Development Program of China (2022YFA1204900) National Natural Science Foundation Youth Fund (No.22105006) Talent Foundation of Northwest Agriculture & Forest University (Z1013023003, Z1013023002) Fundamental Research Funds for the Central Universities (2452024094, 2452024090)
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 2461 Wm−1K−1 at 400.9 K. Moreover, this strategy can also realize efficient batch transfer of suspended graphene and is applicable for fabricating other 2D suspended materials such as MoS2. 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.
Funder: National Key Research and Development Program of China (2022YFA1204900) National Natural Science Foundation Youth Fund (No.22105006) Talent Foundation of Northwest Agriculture & Forest University (Z1013023003, Z1013023002) Fundamental Research Funds for the Central Universities (2452024094, 2452024090)
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 2461 Wm−1K−1 at 400.9 K. Moreover, this strategy can also realize efficient batch transfer of suspended graphene and is applicable for fabricating other 2D suspended materials such as MoS2. 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.