Transfer-Free Batch Fabrication of Large-Area Suspended Graphene Membranes

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• 作者：Benjamín Alemán ; William Regan ; Shaul Aloni ; Virginia Altoe ; Nasim Alem ; Caǧlar Girit ; Baisong Geng ; Lorenzo Maserati ; Michael Crommie ; Feng Wang ; A. Zettl
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：August 24, 2010
• 年：2010
• 卷：4
• 期：8
• 页码：4762-4768
• 全文大小：411K
• 年卷期：0
• ISSN：1936-086X

文摘

We demonstrate a process for batch production of large-area (100−3000 μm²) patterned free-standing graphene membranes on Cu scaffolds using chemical vapor deposition (CVD)-grown graphene. This technique avoids the use of silicon and transfers of graphene. As one application of this technique, we fabricate transmission electron microscopy (TEM) sample supports. TEM characterization of the graphene membranes reveals relatively clean, highly TEM-transparent, single-layer graphene regions (∼50% by area) and, despite the polycrystalline nature of CVD graphene, membrane yields as high as 75−100%. This high yield verifies that the intrinsic strength and integrity of CVD-grown graphene films is sufficient for sub-100 μm width membrane applications. Elemental analysis (electron energy loss spectroscopy (EELS) and X-ray energy-dispersive spectroscopy (EDS)) of the graphene membranes reveals some nanoscaled contamination left over from the etching process, and we suggest several ways to reduce this contamination and improve the quality of the graphene for electronic device applications. This large-scale production of suspended graphene membranes facilitates access to the two-dimensional physics of graphene that are suppressed by substrate interactions and enables the widespread use of graphene-based sample supports for electron and optical microscopy.