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Grimm OC, Somaratne RMDS, Wang Y, Kim S, Whitten JE. Thiol adsorption on metal oxide nanoparticles. Phys Chem Chem Phys 2021; 23:8309-8317. [PMID: 33875995 DOI: 10.1039/d1cp00506e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of 2-naphthalenethiol (2-NPT) and methanethiol (MT) on 13 different metal oxide nanoparticles, of approximately 30 nm average primary particle size, has been investigated. In the case of 2-NPT, which is fluorescent, a screening method to assess adsorption was developed that consists of mixing the nanoparticles with a dilute ethanolic solution of 2-NPT and performing several cycles of centrifuging and rinsing with ethanol. Fluorescence measurements on the re-dispersed particle suspensions were then used to diagnose whether or not adsorption had occurred. Complementary experiments were performed by mounting powder samples of each of the metal oxide nanoparticles onto sample stubs and performing X-ray photoelectron spectroscopy (XPS) before and after in situ dosing with MT. In both cases, adsorption was observed only on ZnO, TiO2, and In2O3. Adsorption did not occur on Al2O3, CeO2, Fe2O3, Gd2O3, Ho2O3, NiO, SiOx, WO3, Y2O3, and ZrO2. Density functional theory (DFT) calculations were performed using small metal oxide clusters, assuming that dissociative adsorption occurs by replacement of a hydroxyl group attached to a metal site and the formation of water. The theoretical and experimental results generally agree, suggesting that this is indeed the adsorption mechanism for most of the nanoparticles. The agreement also suggests that the size and geometry of the nanoclusters play a minor role and that the relative strengths of the metal-sulfur and metal-hydroxyl bonds dictate thiol adsorption. This work has important implications related to the functionalization of metal oxide nanoparticles and surfaces.
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Affiliation(s)
- Owen C Grimm
- Department of Chemistry, The University of Massachusetts Lowell, Lowell, MA 01854, USA.
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Ossowski J, Wächter T, Silies L, Kind M, Noworolska A, Blobner F, Gnatek D, Rysz J, Bolte M, Feulner P, Terfort A, Cyganik P, Zharnikov M. Thiolate versus Selenolate: Structure, Stability, and Charge Transfer Properties. ACS NANO 2015; 9:4508-4526. [PMID: 25857927 DOI: 10.1021/acsnano.5b01109] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Selenolate is considered as an alternative to thiolate to serve as a headgroup mediating the formation of self-assembled monolayers (SAMs) on coinage metal substrates. There are, however, ongoing vivid discussions regarding the advantages and disadvantages of these anchor groups, regarding, in particular, the energetics of the headgroup-substrate interface and their efficiency in terms of charge transport/transfer. Here we introduce a well-defined model system of 6-cyanonaphthalene-2-thiolate and -selenolate SAMs on Au(111) to resolve these controversies. The exact structural arrangements in both types of SAMs are somewhat different, suggesting a better SAM-building ability in the case of selenolates. At the same time, both types of SAMs have similar packing densities and molecular orientations. This permitted reliable competitive exchange and ion-beam-induced desorption experiments which provided unequivocal evidence for a stronger bonding of selenolates to the substrate as compared to the thiolates. Regardless of this difference, the dynamic charge transfer properties of the thiolate- and selenolate-based adsorbates were found to be nearly identical, as determined by the core-hole-clock approach, which is explained by a redistribution of electron density along the molecular framework, compensating the difference in the substrate-headgroup bond strength.
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Affiliation(s)
- Jakub Ossowski
- †Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Tobias Wächter
- ‡Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Laura Silies
- §Institut für Anorganische und Analytische Chemie, Universität Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Martin Kind
- §Institut für Anorganische und Analytische Chemie, Universität Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Agnieszka Noworolska
- †Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Florian Blobner
- ∥Physikdepartment E20, Technische Universität München, 85747 Garching, Germany
| | - Dominika Gnatek
- †Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Jakub Rysz
- †Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Michael Bolte
- §Institut für Anorganische und Analytische Chemie, Universität Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Peter Feulner
- ∥Physikdepartment E20, Technische Universität München, 85747 Garching, Germany
| | - Andreas Terfort
- §Institut für Anorganische und Analytische Chemie, Universität Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Piotr Cyganik
- †Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Michael Zharnikov
- ‡Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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Fernández Macía L, Petrova M, Hauffman T, Muselle T, Doneux T, Hubin A. A study of the electron transfer inhibition on a charged self-assembled monolayer modified gold electrode by odd random phase multisine electrochemical impedance spectroscopy. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.05.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kemnade N, Chen Y, Muglali MI, Erbe A. Electrochemical reductive desorption of alkyl self-assembled monolayers studied in situ by spectroscopic ellipsometry: evidence for formation of a low refractive index region after desorption. Phys Chem Chem Phys 2014; 16:17081-90. [DOI: 10.1039/c4cp01369g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Aggregates formed after reductive desorption of self-assembled monolayers of shorter chained thiols from gold may stabilise hydrogen bubbles.
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Affiliation(s)
- Nina Kemnade
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf, Germany
| | - Ying Chen
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf, Germany
| | - Mutlu I. Muglali
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf, Germany
| | - Andreas Erbe
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf, Germany
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