A convenient method for large-scale STM mapping of freestanding atomically thin conductive membranes.
Rev Sci Instrum
; 88(6): 063702, 2017 Jun.
Article
em En
| MEDLINE
| ID: mdl-28667998
ABSTRACT
Two-dimensional atomically flat sheets with a high flexibility are very attractive as ultrathin membranes but are also inherently challenging for microscopic investigations. We report on a method using Scanning Tunneling Microscopy (STM) under ultra-high vacuum conditions for large-scale mapping of several-micrometer-sized freestanding single and multilayer graphene membranes. This is achieved by operating the STM at unusual parameters. We found that large-scale scanning on atomically thin membranes delivers valuable results using very high tip-scan speeds combined with high feedback-loop gain and low tunneling currents. The method ultimately relies on the particular behavior of the freestanding membrane in the STM which is much different from that of a solid substrate.
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MEDLINE
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En
Ano de publicação:
2017
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Article