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Imaging and dynamics of light atoms and molecules on graphene


Observing the individual building blocks of matter is one of the primary goals of microscopy. The invention of the scanning tunnelling microscope1 revolutionized experimental surface science in that atomic-scale features on a solid-state surface could finally be readily imaged. However, scanning tunnelling microscopy has limited applicability due to restrictions in, for example, sample conductivity, cleanliness, and data acquisition rate. An older microscopy technique, that of transmission electron microscopy (TEM)2,3, has benefited tremendously in recent years from subtle instrumentation advances, and individual heavy (high-atomic-number) atoms can now be detected by TEM4,5,6,7 even when embedded within a semiconductor material8,9. But detecting an individual low-atomic-number atom, for example carbon or even hydrogen, is still extremely challenging, if not impossible, via conventional TEM owing to the very low contrast of light elements2,3,10,11,12. Here we demonstrate a means to observe, by conventional TEM, even the smallest atoms and molecules: on a clean single-layer graphene membrane, adsorbates such as atomic hydrogen and carbon can be seen as if they were suspended in free space. We directly image such individual adatoms, along with carbon chains and vacancies, and investigate their dynamics in real time. These techniques open a way to reveal dynamics of more complex chemical reactions or identify the atomic-scale structure of unknown adsorbates. In addition, the study of atomic-scale defects in graphene may provide insights for nanoelectronic applications of this interesting material.

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Figure 1: Graphene membrane sample as observed by TEM.
Figure 2: Adatom images.
Figure 3: Dynamics of defects.
Figure 4: Molecular scale adsorbates.


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This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the US Department of Energy under contract DE-AC02-05CH11231. A.Z. acknowledges support from the Miller Institute of Basic Research in Science, and C.O.G. acknowledges support from an NSF Graduate Fellowship.

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Correspondence to Jannik C. Meyer or A. Zettl.

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Supplementary information

The file contains Supplementary Methods, Supplementary Figures S1-S3 and Supplementary Discussion: (PDF 1150 kb)

Supplementary information

The file contains Supplementary Movie 1 showing dynamics of a linear molecule on a graphene membrane as in Figs. 4b-d of the main article. Horizontal field of view in the video is 10 nm. (MOV 243 kb)

Supplementary information

The file contains Supplementary Movie 2 showing dynamics of a carbon chain attached between larger adsorbates. Horizontal field of view is 14 nm. (MOV 2484 kb)

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Meyer, J., Girit, C., Crommie, M. et al. Imaging and dynamics of light atoms and molecules on graphene. Nature 454, 319–322 (2008).

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