Anomalous Tip-Sample Distance Behavior on the Tip-Enhanced Raman Spectroscopy of Graphene in Ambient Conditions
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arXiv
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| Format: | Preprint |
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2026
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| author | Pereira, André G. Corrêa, Raul Carneiro, Bianca Rabelo, Cassiano Vasconcelos, Thiago L. Monken, Vitor Cançado, Luiz Gustavo Jorio, Ado |
| author_facet | Pereira, André G. Corrêa, Raul Carneiro, Bianca Rabelo, Cassiano Vasconcelos, Thiago L. Monken, Vitor Cançado, Luiz Gustavo Jorio, Ado |
| contents | Tip-Enhanced Raman Spectroscopy (TERS) combines Raman spectroscopy with scanning probe microscopy to overcome the spatial resolution limitation imposed by light diffraction, offering a primary optical technique for the comprehensive study of two-dimensional (2D) materials. In this work, we investigate an anomalous decay profile of the TERS intensity of the graphene 2D band as the tip-sample separation changes, observations enabled by high TERS efficiency and accuracy in tip-approach and tip-retract procedures. The anomalous results can be properly described by the addition of an ad hoc deformation to the effective tip-sample distance, rationalized here as due to the presence of a liquid meniscus formed via capillary forces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14178 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Anomalous Tip-Sample Distance Behavior on the Tip-Enhanced Raman Spectroscopy of Graphene in Ambient Conditions Pereira, André G. Corrêa, Raul Carneiro, Bianca Rabelo, Cassiano Vasconcelos, Thiago L. Monken, Vitor Cançado, Luiz Gustavo Jorio, Ado Optics Other Condensed Matter Tip-Enhanced Raman Spectroscopy (TERS) combines Raman spectroscopy with scanning probe microscopy to overcome the spatial resolution limitation imposed by light diffraction, offering a primary optical technique for the comprehensive study of two-dimensional (2D) materials. In this work, we investigate an anomalous decay profile of the TERS intensity of the graphene 2D band as the tip-sample separation changes, observations enabled by high TERS efficiency and accuracy in tip-approach and tip-retract procedures. The anomalous results can be properly described by the addition of an ad hoc deformation to the effective tip-sample distance, rationalized here as due to the presence of a liquid meniscus formed via capillary forces. |
| title | Anomalous Tip-Sample Distance Behavior on the Tip-Enhanced Raman Spectroscopy of Graphene in Ambient Conditions |
| topic | Optics Other Condensed Matter |
| url | https://arxiv.org/abs/2601.14178 |