Title: Adsorption Behavior of Organic Molecules: A Study of Benzotriazole on Cu(111) with Spectroscopic and Theoretical Methods

Abstract

The adsorption of organic molecules on solid substrates is important to applications in fields such as catalysis, photovoltaics, corrosion inhibition, adhesion, and sensors. The molecular level description of the surface–molecule interaction and of the adsorption structures in these complex systems is crucial to understand their properties and function. Here, we present an investigation of one such system, benzotriazole (BTAH) on single-crystal Cu(111) in vacuum conditions. BTAH is the most widely used corrosion inhibitor for copper and thus a molecule of great industrial relevance. We show that the co-application of a wide range of spectroscopic techniques with theoretical methods provides unique insight in the description of the atomistic details of the adsorbed structures. Specifically, spectroscopic photoemission, absorption, and standing wave experiments combined with ab initio computational modeling allowed us to identify that benzotriazole forms overlayers of intact BTAH when deposited at low temperature, and it dissociates into BTA and H at room temperature and above. The dissociated molecule then forms complex structures of mixed chains and dimers of BTA bound to copper adatoms. Our work also reveals that copper adatoms at low concentrations, such as the theoretically predicted superstructures, cannot be resolved by means of current X-ray photoelectron spectroscopy as themore » modeled Cu 2p spectra are practically indistinguishable from those for a Cu surface without adatoms. Overall this study significantly deepens understanding of BTAH on Cu, a system studied for more than 50 years, and it highlights the benefits of combining spectroscopic and computational methods to obtain a complete picture of a complex adsorption system.« less

Authors:

Gattinoni, Chiara  ^[1];

• Search DOE PAGES for author "Gattinoni, Chiara"
• Search DOE PAGES for ORCID "0000-0002-3376-6374"

Tsaousis, Panayiotis ^[2]; Euaruksakul, Chanan ^[3]; Price, Rachel ^[2]; Duncan, David A.  ^[4];

• Search DOE PAGES for author "Duncan, David A."
• Search DOE PAGES for ORCID "0000-0002-0827-2022"

Pascal, Tod ^[5]; Prendergast, David ^[5]; Held, Georg  ^[3];

• Search DOE PAGES for author "Held, Georg"
• Search DOE PAGES for ORCID "0000-0003-0726-4183"

Michaelides, Angelos  ^[1]

• Search DOE PAGES for author "Michaelides, Angelos"
• Search DOE PAGES for ORCID "0000-0002-9169-169X"

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+ Show Author Affiliations

1. Univ. College London, London (United Kingdom). Thomas Young Centre, London Centre for Nanotechnology and Department of Physics and Astronomy
2. Univ. of Reading, Reading (United Kingdom). Dept. of Chemistry
3. Univ. of Reading, Reading (United Kingdom). Dept. of Chemistry; Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
4. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry

Publication Date:

Fri Jan 04 00:00:00 EST 2019

Research Org.:

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1543678

Grant/Contract Number:  

AC02-05CH11231

Resource Type:

Accepted Manuscript

Journal Name:

Langmuir

Additional Journal Information:

Journal Volume: 35; Journal Issue: 4; Journal ID: ISSN 0743-7463

Publisher:

American Chemical Society

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Materials Science