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xiejf专家顾问 (文学泰斗)
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Nature最新石墨烯进展：大面积石墨烯的面对面转移技术
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最新一期的Nature杂志刊发了新加坡国立大学Kian Ping Loh课题组关于石墨烯的最新研究论文，题为Face-to-face transfer of wafer-scale graphene films，介绍了大面积石墨烯的新颖的转移技术，成果发在Nature正刊上，值得学习！ Graphene has attracted worldwide interest since its experimental discovery1, 2, but the preparation of large-area, continuous graphene film on SiO2/Si wafers, free from growth-related morphological defects or transfer-induced cracks and folds, remains a formidable challenge3. Growth of graphene by chemical vapour deposition on Cu foils4, 5, 6, 7 has emerged as a powerful technique owing to its compatibility with industrial-scale roll-to-roll technology6. However, the polycrystalline nature and microscopic roughness of Cu foils means that such roll-to-roll transferred films are not devoid of cracks and folds6, 7. High-fidelity transfer or direct growth of high-quality graphene films on arbitrary substrates is needed to enable wide-ranging applications in photonics or electronics, which include devices such as optoelectronic modulators, transistors, on-chip biosensors and tunnelling barriers3, 8, 9. The direct growth of graphene film on an insulating substrate, such as a SiO2/Si wafer, would be useful for this purpose, but current research efforts remain grounded at the proof-of-concept stage, where only discontinuous, nanometre-sized islands can be obtained10. Here we develop a face-to-face transfer method for wafer-scale graphene films that is so far the only known way to accomplish both the growth and transfer steps on one wafer. This spontaneous transfer method relies on nascent gas bubbles and capillary bridges between the graphene film and the underlying substrate during etching of the metal catalyst, which is analogous to the method used by tree frogs to remain attached to submerged leaves11, 12. In contrast to the previous wet4, 5, 13, 14, 15 or dry6, 7 transfer results, the face-to-face transfer does not have to be done by hand and is compatible with any size and shape of substrate; this approach also enjoys the benefit of a much reduced density of transfer defects compared with the conventional transfer method. Most importantly, the direct growth and spontaneous attachment of graphene on the underlying substrate is amenable to batch processing in a semiconductor production line, and thus will speed up the technological application of graphene. /  nature12763-f2.jpg [ Last edited by xiejf on 2014-1-10 at 08:29 ] |
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