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Bossard-Giannesini L, Cardenas L, Cruguel H, Demessence A, Loffreda D, Pluchery O. How far the chemistry of self-assembled monolayers on gold surfaces affects their work function? NANOSCALE 2023; 15:17113-17123. [PMID: 37850381 DOI: 10.1039/d3nr03172a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2023]
Abstract
Self-assembled monolayers composed of various long-chain aliphatic molecules and different tail functional groups have been synthesized on the Au(111) surface and characterized by Kelvin probe force microscopy and ultraviolet photoelectron spectroscopy. Carboxy, amino, thio and methyl terminal groups have been considered in the design of self-assembled monolayers with different aliphatic chain lengths (from C6 to C16). Work function measurements by Kelvin probe force microscopy have been carried out under a controlled and room atmosphere. Remarkably, a reduction of the relative humidity from 40% to 3% has induced a work function shift of up to 0.3 eV. As expected, the changes of the chain length of the aliphatic moiety and of the tail group have a significant impact on the tuning of the measured work function (3.90 eV for dodecanethiol versus 4.57 eV for mercaptohexadecylamine). Surprisingly, the change of the net dipole moment of the tail group (sign and amplitude) does not dominate the work function variations. In contrast, the change of the chain length and the possibility of the tail group to form a complex hydrogen bond network between molecules lead to significant modulations of the work function. In order to interpret these original findings, density functional theory models of equivalent self-assembled monolayers adsorbed on the Au(111) surface have been developed at an unprecedented level of description with large supercells including simultaneously 27 co-adsorbed molecules and weak van der Waals interactions between them. Such large systems have allowed the theoretical modeling of complex hydrogen bond networks between molecules when possible (carboxy tail group). The comparison between computed and measured work functions shows a striking agreement, thus allowing the disentanglement of the previously mentioned competing effects. This consistency between experiment and theory will help in designing the electronic properties of self-assembled monolayers in the context of molecular electronics and organic transistors.
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Affiliation(s)
- Léo Bossard-Giannesini
- Institut des NanoSciences de Paris, UMR7588 CNRS Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
| | - Luis Cardenas
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON - UMR 5256, 2 Avenue Albert Einstein, 69626 Villeurbanne, France
| | - Hervé Cruguel
- Institut des NanoSciences de Paris, UMR7588 CNRS Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
| | - Aude Demessence
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON - UMR 5256, 2 Avenue Albert Einstein, 69626 Villeurbanne, France
| | - David Loffreda
- ENSL, CNRS, Laboratoire de Chimie UMR 5182, 46 Allée d'Italie, 69364 Lyon Cedex, France.
| | - Olivier Pluchery
- Institut des NanoSciences de Paris, UMR7588 CNRS Sorbonne Université, 4 place Jussieu, 75005 Paris, France.
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2
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Fridman H, Levy HM, Meir A, Casotto A, Malkinson R, Dehnel J, Yochelis S, Lifshitz E, Bar-Gill N, Collini E, Paltiel Y. Ultrafast Coherent Delocalization Revealed in Multilayer QDs under a Chiral Potential. J Phys Chem Lett 2023; 14:2234-2240. [PMID: 36820505 PMCID: PMC11139383 DOI: 10.1021/acs.jpclett.2c03743] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
In recent years, it was found that current passing through chiral molecules exhibits spin preference, an effect known as Chiral Induced Spin Selectivity (CISS). The effect also enables the reduction of scattering and therefore enhances delocalization. As a result, the delocalization of an exciton generated in the dots is not symmetric and relates to the electronic and hole excited spins. In this work utilizing fast spectroscopy on hybrid multilayered QDs with a chiral polypeptide linker system, we probed the interdot chiral coupling on a short time scale. Surprisingly, we found strong coherent coupling and delocalization despite having long 4-nm chiral linkers. We ascribe the results to asymmetric delocalization that is controlled by the electron spin. The effect is not measured when using shorter nonchiral linkers. As the system mimics light-harvesting antennas, the results may shed light on a mechanism of fast and efficient energy transfer in these systems.
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Affiliation(s)
- Hanna
T. Fridman
- Applied
Physics Department, Jerusalem, The Hebrew
University of Jerusalem, Jerusalem 91904, Israel
| | - Hadar Manis Levy
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
| | - Amitai Meir
- Applied
Physics Department, Jerusalem, The Hebrew
University of Jerusalem, Jerusalem 91904, Israel
| | - Andrea Casotto
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
| | - Rotem Malkinson
- Applied
Physics Department, Jerusalem, The Hebrew
University of Jerusalem, Jerusalem 91904, Israel
| | - Joanna Dehnel
- Nancy
and Stephen Grand Technion Energy Program, Russell Berrie Nanotechnology
Institute, Quantum Information Center, Schulich Faculty of Chemistry,
Solid State Institute, Technion Israel Institute
of Technology, Solid Stat, IL-3200003 Haifa, Israel
| | - Shira Yochelis
- Applied
Physics Department, Jerusalem, The Hebrew
University of Jerusalem, Jerusalem 91904, Israel
| | - Efrat Lifshitz
- Nancy
and Stephen Grand Technion Energy Program, Russell Berrie Nanotechnology
Institute, Quantum Information Center, Schulich Faculty of Chemistry,
Solid State Institute, Technion Israel Institute
of Technology, Solid Stat, IL-3200003 Haifa, Israel
| | - Nir Bar-Gill
- Applied
Physics Department, Jerusalem, The Hebrew
University of Jerusalem, Jerusalem 91904, Israel
- The Racah
Institute of Physics, The Hebrew University
of Jerusalem, Jerusalem 91904, Israel
- The Center
for Nanoscience and Nanotechnology, The
Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Elisabetta Collini
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
| | - Yossi Paltiel
- Applied
Physics Department, Jerusalem, The Hebrew
University of Jerusalem, Jerusalem 91904, Israel
- The Center
for Nanoscience and Nanotechnology, The
Hebrew University of Jerusalem, Jerusalem 91904, Israel
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3
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Sut TN, Tan SW, Jeon WY, Yoon BK, Cho NJ, Jackman JA. Streamlined Fabrication of Hybrid Lipid Bilayer Membranes on Titanium Oxide Surfaces: A Comparison of One- and Two-Tail SAM Molecules. NANOMATERIALS 2022; 12:nano12071153. [PMID: 35407271 PMCID: PMC9000636 DOI: 10.3390/nano12071153] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 03/29/2022] [Accepted: 03/29/2022] [Indexed: 01/26/2023]
Abstract
There is broad interest in fabricating cell-membrane-mimicking, hybrid lipid bilayer (HLB) coatings on titanium oxide surfaces for medical implant and drug delivery applications. However, existing fabrication strategies are complex, and there is an outstanding need to develop a streamlined method that can be performed quickly at room temperature. Towards this goal, herein, we characterized the room-temperature deposition kinetics and adlayer properties of one- and two-tail phosphonic acid-functionalized molecules on titanium oxide surfaces in various solvent systems and identified optimal conditions to prepare self-assembled monolayers (SAMs), upon which HLBs could be formed in select cases. Among the molecular candidates, we identified a two-tail molecule that formed a rigidly attached SAM to enable HLB fabrication via vesicle fusion for membrane-based biosensing applications. By contrast, vesicles adsorbed but did not rupture on SAMs composed of one-tail molecules. Our findings support that two-tail phosphonic acid SAMs offer superior capabilities for rapid HLB coating fabrication at room temperature, and these streamlined capabilities could be useful to prepare durable lipid bilayer coatings on titanium-based materials.
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Affiliation(s)
- Tun Naw Sut
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon 16419, Korea; (T.N.S.); (S.W.T.); (W.-Y.J.)
| | - Sue Woon Tan
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon 16419, Korea; (T.N.S.); (S.W.T.); (W.-Y.J.)
| | - Won-Yong Jeon
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon 16419, Korea; (T.N.S.); (S.W.T.); (W.-Y.J.)
| | - Bo Kyeong Yoon
- School of Healthcare and Biomedical Engineering, Chonnam National University, Yeosu 59626, Korea
- Correspondence: (B.K.Y.); (N.-J.C.); (J.A.J.)
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore
- Correspondence: (B.K.Y.); (N.-J.C.); (J.A.J.)
| | - Joshua A. Jackman
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon 16419, Korea; (T.N.S.); (S.W.T.); (W.-Y.J.)
- Correspondence: (B.K.Y.); (N.-J.C.); (J.A.J.)
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4
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Shao F, Zheng L, Lan J, Zenobi R. Nanoscale Chemical Imaging of Coadsorbed Thiolate Self-Assembled Monolayers on Au(111) by Tip-Enhanced Raman Spectroscopy. Anal Chem 2022; 94:1645-1653. [DOI: 10.1021/acs.analchem.1c03968] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Feng Shao
- Department of Physics and Astronomy, National Graphene Institute, University of Manchester, Manchester M13 9PL, U.K
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Liqing Zheng
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Jinggang Lan
- Department of Chemistry, University of Zurich, 8057 Zurich, Switzerland
| | - Renato Zenobi
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
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5
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Jansen M, Juranyi F, Yarema O, Seydel T, Wood V. Ligand Dynamics in Nanocrystal Solids Studied with Quasi-Elastic Neutron Scattering. ACS NANO 2021; 15:20517-20526. [PMID: 34878757 DOI: 10.1021/acsnano.1c09073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nanocrystal surfaces are commonly populated by organic ligands, which play a determining role in the optical, electronic, thermal, and catalytic properties of the individual nanocrystals and their assemblies. Understanding the bonding of ligands to nanocrystal surfaces and their dynamics is therefore important for the optimization of nanocrystals for different applications. In this study, we use temperature-dependent, quasi-elastic neutron scattering (QENS) to investigate the dynamics of different surface bound alkanethiols in lead sulfide nanocrystal solids. We select alkanethiols with mono- and dithiol terminations, as well as different backbone types and lengths. QENS spectra are collected both on a time-of-flight spectrometer and on a backscattering spectrometer, allowing us to investigate ligand dynamics in a time range from a few picoseconds to nanoseconds. Through model-based analysis of the QENS data, we find that ligands can either (1) precess around a central axis, while simultaneously rotating around their own molecular axis, or (2) only undergo uniaxial rotation with no precession. We establish the percentage of ligands undergoing each type of motion, the average relaxation times, and activation energies for these motions. We determine, for example, that dithiols which link facets of neighboring nanocrystals only exhibit uniaxial rotation and that longer ligands have higher activation energies and show smaller opening angles of precession due to stronger ligand-ligand interactions. Generally, this work provides insight into the arrangement and dynamics of ligands in nanocrystal solids, which is key to understanding their mechanical and thermal properties, and, more generally, highlights the potential of QENS for studying ligand behavior.
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Affiliation(s)
- Maximilian Jansen
- Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Fanni Juranyi
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Olesya Yarema
- Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Tilo Seydel
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Vanessa Wood
- Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
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6
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Bhadra P, Siu SWI. Effect of Concentration, Chain Length, Hydrophobicity, and an External Electric Field on the Growth of Mixed Alkanethiol Self-Assembled Monolayers: A Molecular Dynamics Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1913-1924. [PMID: 33503375 DOI: 10.1021/acs.langmuir.0c03414] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Growing functionalized self-assembled monolayers (SAMs) with fewer defects and lower cost is the focus of ongoing investigations. In the present study, molecular dynamics simulations were performed to investigate the process of SAM formation on a gold substrate from mixed alkanethiolates in ethanol solution. Using the mixed-SAM system of 11-mercaptoundecanoic acid (MUA) with either 1-decanethiol (C9CH3) or 6-mercaptohexanol (C6OH) in a 3:7 ratio as the standard SAM model, we systematically investigated the effects of the concentration, chain length, functional group, and an external electric field on SAM growth. The results showed that the initial growth rate and surface coverage of the SAM are dependent on the ligand concentration. At a certain high concentration (about 1.2-1.5 times the minimum concentration), the final surface coverage is optimal. Reducing the chain length and increasing the proportion of hydrophobic diluting molecules are effective ways to improve the surface coverage, but the compositional ligands have to be changed, which may not be desirable for the functional requirements of SAMs. Furthermore, by investigating the behavior of the alkanethiolates and ethanol solvent under an applied external field, we find that a strong electric field with a proper field direction can facilitate the generation of defect-free monolayers. These findings will contribute to the understanding of mixed-SAM formation and provide insight into experimental design for efficient and effective SAM formation.
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Affiliation(s)
- Pratiti Bhadra
- Department of Computer and Information Science, University of Macau, Taipa, Macau
| | - Shirley W I Siu
- Department of Computer and Information Science, University of Macau, Taipa, Macau
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7
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Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light. Catalysts 2020. [DOI: 10.3390/catal10091074] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Platinum and nitrogen co-doped titania films of different surface morphologies obtained via a sol-gel process have been tested for tetracycline hydrochloride photocatalytic decomposition under simulated solar light. Titania crystallization to anatase is shown by XRD for all films. A shift of the bandgap edge toward the visible region in absorption spectra and, consequently, a narrowing of the bandgap is observed for some films doped with nitrogen and/or exposed to UV pretreatment. The surface peculiarities of the samples are presented by an SEM and TEM investigation. The surface saturation by Pt and N with a homogeneous distribution of Pt ions on the surface as well as bulk as established by XPS and EDS data can be achieved with a certain synthesis procedure. The influence of the platinum content and of the pretreatment procedure on the state and atomic surface concentration of incorporated nitrogen and platinum is studied by XPS analysis: substitutional and interstitial nitrogen, non-metal containing fragments, Pt0, Pt2+ and Pt4+ ions. The photocatalytic activity of the films is ruled by the presence of Pt2+ ions and N rather than Pt0. The formation of the polycrystalline titania structure and Pt0 nanoparticles (NPs) is confirmed by TEM and electron diffraction images. The mechanism of primary photocatalytic processes is proposed.
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8
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Lawrence J, Sosso GC, Đorđević L, Pinfold H, Bonifazi D, Costantini G. Combining high-resolution scanning tunnelling microscopy and first-principles simulations to identify halogen bonding. Nat Commun 2020; 11:2103. [PMID: 32355173 PMCID: PMC7192931 DOI: 10.1038/s41467-020-15898-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 03/24/2020] [Indexed: 12/02/2022] Open
Abstract
Scanning tunnelling microscopy (STM) is commonly used to identify on-surface molecular self-assembled structures. However, its limited ability to reveal only the overall shape of molecules and their relative positions is not always enough to fully solve a supramolecular structure. Here, we analyse the assembly of a brominated polycyclic aromatic molecule on Au(111) and demonstrate that standard STM measurements cannot conclusively establish the nature of the intermolecular interactions. By performing high-resolution STM with a CO-functionalised tip, we clearly identify the location of rings and halogen atoms, determining that halogen bonding governs the assemblies. This is supported by density functional theory calculations that predict a stronger interaction energy for halogen rather than hydrogen bonding and by an electron density topology analysis that identifies characteristic features of halogen bonding. A similar approach should be able to solve many complex 2D supramolecular structures, and we predict its increasing use in molecular nanoscience at surfaces.
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Affiliation(s)
- James Lawrence
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Gabriele C Sosso
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
- Centre for Scientific Computing, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
| | - Luka Đorđević
- School of Chemistry, Cardiff University, Park Place Main Building, Cardiff, CF10 3AT, UK
| | - Harry Pinfold
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Davide Bonifazi
- School of Chemistry, Cardiff University, Park Place Main Building, Cardiff, CF10 3AT, UK.
| | - Giovanni Costantini
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
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9
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Stetsenko M, Margitych T, Kryvyi S, Maksimenko L, Hassan A, Filonenko S, Li Β, Qu J, Scheer E, Snegir S. Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E512. [PMID: 32168942 PMCID: PMC7153467 DOI: 10.3390/nano10030512] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 03/02/2020] [Accepted: 03/06/2020] [Indexed: 12/02/2022]
Abstract
Here we study the morphology and the optical properties of assemblies made of small (17 nm) gold nanoparticles (AuNPs) directly on silicon wafers coated with (3-aminopropyl)trimethoxysilane (APTES). We employed aliphatic 1,6-hexanedithiol (HDT) molecules to cross-link AuNPs during a two-stage precipitation procedure. The first immersion of the wafer in AuNP colloidal solution led mainly to the attachment of single particles with few inclusions of dimers and small aggregates. After the functionalization of precipitated NPs with HDT and after the second immersion in the colloidal solution of AuNP, we detected a sharp rise in the number of aggregates compared to single AuNPs and their dimers. The lateral size of the aggregates was about 100 nm, while some of them were larger than 1μm. We propose that the uncompensated dipole moment of the small aggregates appeared after the first precipitation and acts further as the driving force accelerating their further growth on the surface during the second precipitation. By having such inhomogeneous surface coating, the X-ray reciprocal space maps and modulation polarimetry showed well-distinguished signals from the single AuNPs and their dimers. From these observations, we concluded that the contribution from aggregated AuNPs does not hamper the detection and investigation of plasmonic effects for AuNP dimers. Meantime, using unpolarized and polarized light spectroscopy, the difference in the optical signals between the dimers, being formed because of self-aggregation and the one being cross-linked by means of HDT, was not detected.
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Affiliation(s)
- Maksym Stetsenko
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; (M.S.); (A.H.)
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03680 Kyiv, Ukraine; (S.K.); (L.M.)
| | - Tetiana Margitych
- Kyiv Institute for Nuclear Research, National Academy of Sciences of Ukraine, 03680 Kyiv, Ukraine;
| | - Serhii Kryvyi
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03680 Kyiv, Ukraine; (S.K.); (L.M.)
- Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland
| | - Lidia Maksimenko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03680 Kyiv, Ukraine; (S.K.); (L.M.)
| | - Ali Hassan
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; (M.S.); (A.H.)
| | - Svitlana Filonenko
- Pisarzhevski Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospect Nauky, 03028 Kiev, Ukraine;
| | - Βaikui Li
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; (M.S.); (A.H.)
| | - Junle Qu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; (M.S.); (A.H.)
| | - Elke Scheer
- University of Konstanz, Department of Physics, Universitätsstraße 10, 78464 Konstanz, Germany;
| | - Sergii Snegir
- University of Konstanz, Department of Physics, Universitätsstraße 10, 78464 Konstanz, Germany;
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10
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Linnik O, Popescu-Pelin G, Stefan N, Chorna N, Smirnova N, Mihailescu CN, Ristoscu C, Mihailescu IN. Investigation of nitrogen and iron co-doped TiO2 films synthesized in N2/CH4 via pulsed laser deposition technique. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01309-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Zoloff Michoff ME, Ribas-Arino J, Marx D. Selective Nanomechanics of Aromatic versus Aliphatic Thiolates on Gold Surfaces. PHYSICAL REVIEW LETTERS 2019; 122:086801. [PMID: 30932588 DOI: 10.1103/physrevlett.122.086801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 12/23/2018] [Indexed: 06/09/2023]
Abstract
Thiolated gold nanointerfaces play a key role in numerous fields of science, technology, as well as modern medicine to coat, functionalize, and protect. Our computational study reveals that the mechanical vs thermal stabilities of aliphatic thiolates on gold surfaces are strikingly different from those of aromatic thiolates. The aliphatic thiolates feature, at the same time, a higher thermal desorption energy but a lower mechanical rupture force than thiophenolates. Our analysis discloses that this most counterintuitive property is due to different mechanochemical detachment mechanisms. Electronic structure analyses along the detachment pathways trace this back to the distinct electronic properties of the S─Au bond in stretched nanojunctions. The discoveries that it is a higher thermal stability that entails a lower mechanical stability and that mechanical loads generate different local nanostructures depending on the nature of the thiolate are highly relevant for the rational design of improved thiol-gold nanocontacts.
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Affiliation(s)
| | - Jordi Ribas-Arino
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
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12
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Oliveira N, Costa-Rama E, Viswanathan S, Delerue-Matos C, Pereira L, Morais S. Label-free Voltammetric Immunosensor for Prostate Specific Antigen Detection. ELECTROANAL 2018. [DOI: 10.1002/elan.201800417] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Nélia Oliveira
- REQUIMTE/LAQV; Instituto Superior de Engenharia do Porto; Instituto Politécnico do Porto; Rua Dr. António Bernardino de Almedia 431 4200-072 Porto Portugal
| | - Estefanía Costa-Rama
- REQUIMTE/LAQV; Instituto Superior de Engenharia do Porto; Instituto Politécnico do Porto; Rua Dr. António Bernardino de Almedia 431 4200-072 Porto Portugal
| | - Subramanian Viswanathan
- Department of Industrial Chemistry; Alagappa University; Karaikudi- 630003, Tamilnadu, India
| | - Cristina Delerue-Matos
- REQUIMTE/LAQV; Instituto Superior de Engenharia do Porto; Instituto Politécnico do Porto; Rua Dr. António Bernardino de Almedia 431 4200-072 Porto Portugal
| | - Lourdes Pereira
- Department of Medical Sciences; CICECO-Aveiro Institute of Materials; University of Aveiro, Campus Santiago; 3810-193 Aveiro Portugal
| | - Simone Morais
- REQUIMTE/LAQV; Instituto Superior de Engenharia do Porto; Instituto Politécnico do Porto; Rua Dr. António Bernardino de Almedia 431 4200-072 Porto Portugal
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13
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Huerta-Miranda G, Arrocha-Arcos A, Miranda-Hernández M. Gold nanoparticles/4-aminothiophenol interfaces for direct electron transfer of horseradish peroxidase: Enzymatic orientation and modulation of sensitivity towards hydrogen peroxide detection. Bioelectrochemistry 2018; 122:77-83. [DOI: 10.1016/j.bioelechem.2018.03.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 03/07/2018] [Accepted: 03/10/2018] [Indexed: 11/30/2022]
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