Nanoscale chemical imaging of a dynamic molecular phase boundary with ultrahigh vacuum tip-enhanced raman spectroscopy

Nan Jiang; Naihao Chiang; Lindsey R. Madison; Eric A. Pozzi; Michael R Wasielewski; Tamar Seideman; Mark A Ratner; Mark C Hersam; George C Schatz; Richard P. Van Duyne

doi:10.1021/acs.nanolett.6b01405

Nanoscale chemical imaging of a dynamic molecular phase boundary with ultrahigh vacuum tip-enhanced raman spectroscopy

Nan Jiang, Naihao Chiang, Lindsey R. Madison, Eric A. Pozzi, Michael R Wasielewski, Tamar Seideman, Mark A Ratner, Mark C Hersam, George C Schatz, Richard P. Van Duyne

Northwestern University

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

Abstract

Nanoscale chemical imaging of a dynamic molecular phase boundary has broad implications for a range of problems in catalysis, surface science, and molecular electronics. While scanning probe microscopy (SPM) is commonly used to study molecular phase boundaries, its information content can be severely compromised by surface diffusion, irregular packing, or three-dimensional adsorbate geometry. Here, we demonstrate the simultaneous chemical and structural analysis of N-N′-bis(2,6-diisopropylphenyl)-1,7-(4′-t-butylphenoxy)perylene-3,4:9,10-bis(dicarboximide) (PPDI) molecules by UHV tip-enhanced Raman spectroscopy. Both condensed and diffusing domains of PPDI coexist on Ag(100) at room temperature. Through comparison with time-dependent density functional theory simulations, we unravel the orientation of PPDI molecules at the dynamic molecular domain boundary with unprecedented ∼4 nm spatial resolution.

Original language	English
Pages (from-to)	3898-3904
Number of pages	7
Journal	Nano Letters
Volume	16
Issue number	6
DOIs	https://doi.org/10.1021/acs.nanolett.6b01405
Publication status	Published - Jun 8 2016

Keywords

dynamic molecular phase boundary
time-dependent density functional theory (TDDFT)
Tip-enhanced Raman spectroscopy (TERS)
ultrahigh vacuum scanning tunneling microscopy (UHV-STM)

ASJC Scopus subject areas

Condensed Matter Physics
Bioengineering
Chemistry(all)
Materials Science(all)
Mechanical Engineering

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Nanoscale chemical imaging of a dynamic molecular phase boundary with ultrahigh vacuum tip-enhanced raman spectroscopy. / Jiang, Nan; Chiang, Naihao; Madison, Lindsey R.; Pozzi, Eric A.; Wasielewski, Michael R; Seideman, Tamar; Ratner, Mark A ; Hersam, Mark C ; Schatz, George C; Van Duyne, Richard P.

In: Nano Letters, Vol. 16, No. 6, 08.06.2016, p. 3898-3904.

Research output: Contribution to journal › Article › peer-review

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