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Two-dimensional (2D) materials, such as graphene and transition-metal dichalcogenide monolayers, have unique properties that are distinctly different from those of their bulk counterparts, and hopefully possess a wide range of applications in 2D semiconductor device. Structural defects are known to have profound influences on the properties of crystalline materials; thus, correlating the defect structure with local properties in 2D material is of fundamental importance. However, electron microscopy studies of 2D materials on an atomic scale have become a challenge as most of these materials are susceptible to electron beam irradiation damage under high voltage and high dose experimental conditions. The development of low voltage aberration-corrected scanning transmission electron microscopy (STEM) has made it possible to study 2D materials at a single atom level without damaging their intrinsic structures. In addition, controllable structural modification by using electron beam becomes feasible by controlling the electron beam-sample interaction. New nanostructures can be created and novel 2D materials can be fabricated in-situ by using this approach. In this article, we review some of our recent studies of graphene and transition-metal dichalcogenides to showcase the applications of low voltage aberration corrected STEM in 2D material research.
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Keywords:
- two-dimensional materials /
- scanning transmission electron microscopy /
- low voltage /
- defect engineering
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[1] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666
[2] As thin as it gets 2017 Nat. Mater. 16 155
[3] Bhimanapati G R, Lin Z, Meunier V, Jung Y, Cha J, Das S, Xiao D, Son Y, Strano M S, Cooper V R, Liang L, Louie S G, Ringe E, Zhou W, Kim S S, Naik R R, Sumpter B G, Terrones H, Xia F, Wang Y, Zhu J, Akinwande D, Alem N, Schuller J A, Schaak R E, Terrones M, Robinson J A 2015 ACS Nano 9 11509
[4] Krivanek O L, Chisholm M F, Nicolosi V, Pennycook T J, Corbin G J, Dellby N, Murfitt M F, Own C S, Szilagyi Z S, Oxley M P, Pantelides S T, Pennycook S J 2010 Nature 464 571
[5] Meyer J C, Eder F, Kurasch S, Skakalova V, Kotakoski J, Park H J, Roth S, Chuvilin A, Eyhusen S, Benner G, Krasheninnikov A V, Kaiser U 2012 Phys. Rev. Lett. 108 196102
[6] Suenaga K, Iizumi Y, Okazaki T 2011 Europ. Phys. J. Appl. Phys. 54 33508
[7] Krivanek O L, Zhou W, Chisholm M F, Idrobo J C, Lovejoy T C, Ramasse Q M, Dellby N 2012 Gentle STEM of Single Atoms: Low keV Imaging and Analysis at Ultimate Detection Limits (West Sussex: John Wiley Sons, Ltd.) p119
[8] Krivanek O L, Lovejoy T C, Dellby N, Carpenter R W 2013 Microscopy 62 3
[9] Zhou W, Oxley M P, Lupini A R, Krivanek O L, Pennycook S J, Idrobo J C 2012 Microsc. Microanal. 18 1342
[10] Krivanek O L, Lovejoy T C, Dellby N, Aoki T, Carpenter R W, Rez P, Soignard E, Zhu J, Batson P E, Lagos M J, Egerton R F, Crozier P A 2014 Nature 514 209
[11] Jones L, Yang H, Pennycook T J, Marshall M S J, Aert S V, Browning N D, Castell M R, Nellist P D 2015 Advanced Structural and Chemical Imaging 1 8
[12] Sang X, LeBeau J M 2014 Ultramicroscopy 138 28
[13] Urban K W 2008 Science 321 506
[14] Urban K W 2009 Nat. Mater. 8 260
[15] Yankovich A B, Berkels B, Dahmen W, Binev P, Sanchez S I, Bradley S A, Li A, Szlufarska I, Voyles P M 2014 Nat. Commun. 5 4155
[16] Gong Y, Liu Z, Lupini A R, Shi G, Lin J, Najmaei S, Lin Z, Elas A L, Berkdemir A, You G, Terrones H, Terrones M, Vajtai R, Pantelides S T, Pennycook S J, Lou J, Zhou W, Ajayan P M 2014 Nano Lett. 14 442
[17] Zhou W, Pennycook S J, Idrobo J C 2012 Ultramicroscopy 119 51
[18] Kapetanakis M D, Zhou W, Oxley M P, Lee J, Prange M P, Pennycook S J, Idrobo J C, Pantelides S T 2015 Phys. Rev. B 92 125147
[19] Zhou W, Kapetanakis M D, Prange M P, Pantelides S T, Pennycook S J, Idrobo J C 2012 Phys. Rev. Lett. 109 206803
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[23] Gong Y, Lin J, Wang X, Shi G, Lei S, Lin Z, Zou X, Ye G, Vajtai R, Yakobson B I, Terrones H, Terrones M, Tay B K, Lou J, Pantelides S T, Liu Z, Zhou W, Ajayan P M 2014 Nat. Mater. 13 1135
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[25] Hong J, Hu Z, Probert M, Li K, L D, Yang X, Gu L, Mao N, Feng Q, Xie L, Zhang J, Wu D, Zhang Z, Jin C, Ji W, Zhang X, Yuan J, Zhang Z 2015 Nat. Commun. 6 6293
[26] Zou X, Liu Y, Yakobson B I 2013 Nano Lett. 13 253
[27] Najmaei S, Liu Z, Zhou W, Zou X, Shi G, Lei S, Yakobson B I, Idrobo J C, Ajayan P M, Lou J 2013 Nat. Mater. 12 754
[28] Lee J, Zhou W, Pennycook S J, Idrobo J C, Pantelides S T 2013 Nat. Commun. 4 1650
[29] Susi T, Meyer J C, Kotakoski J 2017 Ultramicroscopy 180 163
[30] Lin J, Pantelides S T, Zhou W 2015 ACS Nano 9 5189
[31] Susi T, Kotakoski J, Kepaptsoglou D, Mangler C, Lovejoy T C, Krivanek O L, Zan R, Bangert U, Ayala P, Meyer J C, Ramasse Q 2014 Phys. Rev. Lett. 113 115501
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[33] Komsa H P, Kotakoski J, Kurasch S, Lehtinen O, Kaiser U, Krasheninnikov A V 2012 Phys. Rev. Lett. 109 035503
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[35] Sutter E, Huang Y, Komsa H P, Ghorbani-Asl M, Krasheninnikov A V, Sutter P 2016 Nano Lett. 16 4410
[36] Kotakoski J, Meyer J C, Kurasch S, Santos-Cottin D, Kaiser U, Krasheninnikov A V 2011 Phys. Rev. B 83 245420
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[41] Lin J, Zhang Y, Zhou W, Pantelides S T 2016 ACS Nano 10 2782
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[43] Shi Y, Zhou W, Lu A Y, Fang W, Lee Y H, Hsu A L, Kim S M, Kim K K, Yang H Y, Li L J, Idrobo J C, Kong J 2012 Nano Lett. 12 2784
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[45] Gong Y, Lei S, Ye G, Li B, He Y, Keyshar K, Zhang X, Wang Q, Lou J, Liu Z, Vajtai R, Zhou W, Ajayan P M 2015 Nano Lett. 15 6135
[46] Jariwala D, Marks T J, Hersam M C 2017 Nat. Mater. 16 170
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