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2D Materials

Graphene provided the excitement and impact to explore isolated 2D atomic layers that go beyond graphene and have a rich variety of composition, electronic structures and properties. There is opportunity to engineer the band gaps in these 2D atomic layers to span the entire range of materials from metals to semiconductors to insulators. We are pursuing strategies to synthesize, characterize and find applications for several of the 2D materials that complement graphene in properties. Hexagonal boron nitride, boron-carbon-nitrogen systems, metal di chalcogenides etc. fall into this category. Atomic layers of these materials and the possibility of creating unique hybrids of these materials are being explored with several applications in mind.


F. Liu, S. Zheng, X. He, A. Chaturvedi, J. He, W. L. Chow, T. R. Mion, X. Wang, J. Zhou, Q. Fu, H. J. Fan, B. K. Tay, L. Song, R.-H. He, C. Kloc, P. M. Ajayan, Z. Liu, “Highly Sensitive Detection of Polarized Light Using Anisotropic 2D ReS2,” Adv Funct Mater 26 (8): 1169-1177 (2016). Read Article

D. Sarkar, X. Xie, W. Liu, W. Cao, J. Kang, Y. Gong, S. Kraemer, P.M. Ajayan, K. Banerjee, “A subthermionic tunnel field-effect transistor with an atomically thin channel”, Nature 526: 91-95 (2015). Read Article

K. Keyshar, Y. Gong, G. Ye, G. Brunetto, W. Zhou, D.P. Cole, K. Hackenberg, Y. He, L. Machado, M. Kabbani, A.H.C. Hart, B. Li, D.S. Galvao, A. George, R. Vajtai, C.S. Tiwary, P.M. Ajayan, “Chemical Vapor Deposition of Monolayer Rhenium Disulfide (ReS2)”, Advanced Materials 27(31): 4640-4648 (2015). Read Article

J. Shen, Y. He, J. Wu, C. Gao, K. Keyshar, X. Zhang, Y. Yang, M. Ye, R. Vajtai, J. Lou, P.M. Ajayan, “Liquid Phase Exfoliation of Two-Dimensional Materials by Directly Probing and Matching Surface Tension Components”, Nano Letters 15(8): 5449-5454 (2015). Read Article

S. Lei, F. Wen, B. Li, Q. Wang, Y. Huang, Y. Gong, Y. He, P. Dong, J. Bellah, A. George, L. Ge, J. Lou, N. J. Halas, R. Vajtai, P. M. Ajayan, Optoelectronic Memory Using Two-Dimensional Materials. Nano Letters 15(1): 1530-6984 (2015). Read Article

Y. Gong, J. Lin, X. Wang, G. Shi, S. Lei, Z. Lin, X. Zou, G. Ye, R. Vajtai, B. I. Yakobson, H. Terrones, M. Terrones, B. K. Tay, J. Lou, S. T. Pantelides, Z. Liu, W. Zhou, P. M. Ajayan, Vertical and in-plane heterostructures from WS2/MoS2 monolayers. Nature materials 13.12 (2014): 1135-1142. Read Article

S. B. Yang, Y. J. Gong, J. S. Zhang, L. Zhan, L. L. Ma, Z. Y. Fang, R. Vajtai, X. C. Wang, and P. M. Ajayan, “Exfoliated Graphitic Carbon Nitride Nanosheets as Efficient Catalysts for Hydrogen Evolution under Visible Light”, Advanced Materials, 25(17), 2452-2456 (2013). Read Article

S. Lei , L. Ge , Z. Liu , S. Najmaei, G. Shi , G. You, J. Lou, R. Vajtai, P. M. Ajayan, Synthesis and photoresponse of large GaSe atomic layers. Nano letters 13.6 (2013): 2777-2781. Read Article

Y. Gong, Z. Liu, A. R. Lupini, G. Shi, J. Lin, S. Najmaei, Z. Lin, A. L. Elías, A. Berkdemir, G. You, H. Terrones, M. Terrones, R. Vajtai, S. T. Pantelides, S. J. Pennycook, J. Lou, W. Zhou, P. M. Ajayan, Band gap engineering and layer-by-layer mapping of selenium-doped molybdenum disulfide.” Nano letters 14.2 (2013): 442-449. Read Article

Y. Liu, L. Ma, G. Shi, W. Zhou, Y. Gong, S. Lei, X. Yang, J. Zhang, J. Yu, K. P. Hackenberg, A. Babakhani, J. C. Idrobo, R. Vajtai, J. Lou, P. M. Ajayan, In-plane heterostructures of graphene and hexagonal boron nitride with controlled domain sizes.” Nature nanotechnology 8.2 (2013): 119-124. Read Article