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Imaging the potential distribution of individual charged impurities on graphene by low-energy electron holography.
Ultramicroscopy ; 182: 276-282, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28780143
ABSTRACT
While imaging individual atoms can routinely be achieved in high resolution transmission electron microscopy, visualizing the potential distribution of individually charged adsorbates leading to a phase shift of the probing electron wave is still a challenging task. Low-energy electrons (30 - 250 eV) are sensitive to localized potential gradients. We employed low-energy electron holography to acquire in-line holograms of individual charged impurities on free-standing graphene. By applying an iterative phase retrieval reconstruction routine we recover the potential distribution of the localized charged impurities present on free-standing graphene.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Ultramicroscopy Ano de publicação: 2017 Tipo de documento: Artigo