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Guo C, Benzie P, Hu S, de Nijs B, Miele E, Elliott E, Arul R, Benjamin H, Dziechciarczyk G, Rao RR, Ryan MP, Baumberg JJ. Extensive photochemical restructuring of molecule-metal surfaces under room light. Nat Commun 2024; 15:1928. [PMID: 38431651 PMCID: PMC10908804 DOI: 10.1038/s41467-024-46125-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 02/13/2024] [Indexed: 03/05/2024] Open
Abstract
The molecule-metal interface is of paramount importance for many devices and processes, and directly involved in photocatalysis, molecular electronics, nanophotonics, and molecular (bio-)sensing. Here the photostability of this interface is shown to be sensitive even to room light levels for specific molecules and metals. Optical spectroscopy is used to track photoinduced migration of gold atoms when functionalised with different thiolated molecules that form uniform monolayers on Au. Nucleation and growth of characteristic surface metal nanostructures is observed from the light-driven adatoms. By watching the spectral shifts of optical modes from nanoparticles used to precoat these surfaces, we identify processes involved in the photo-migration mechanism and the chemical groups that facilitate it. This photosensitivity of the molecule-metal interface highlights the significance of optically induced surface reconstruction. In some catalytic contexts this can enhance activity, especially utilising atomically dispersed gold. Conversely, in electronic device applications such reconstructions introduce problematic aging effects.
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Affiliation(s)
- Chenyang Guo
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
| | - Philip Benzie
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
- Cambridge Display Technology Ltd, Cardinal Way, Godmanchester, PE29 2XG, UK
| | - Shu Hu
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
| | - Bart de Nijs
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
| | - Ermanno Miele
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
| | - Eoin Elliott
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
| | - Rakesh Arul
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK
| | - Helen Benjamin
- Cambridge Display Technology Ltd, Cardinal Way, Godmanchester, PE29 2XG, UK
| | | | - Reshma R Rao
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
| | - Mary P Ryan
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
| | - Jeremy J Baumberg
- Nanophotonics Centre, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, England, UK.
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2
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Tong Y, Alsalama M, Berdiyorov GR, Hamoudi H. A combined experimental and computational study of the effect of electron irradiation on the transport properties of aromatic and aliphatic molecular self-assemblies. NANOSCALE ADVANCES 2022; 4:3745-3755. [PMID: 36133338 PMCID: PMC9470021 DOI: 10.1039/d2na00040g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 07/13/2022] [Indexed: 06/16/2023]
Abstract
Intermolecular cross-linking through electron irradiation is proven to be an effective tool to improve the mechanical and electronic properties of molecular self-assembled monolayers (SAMs), which is known to be a key player for material nanoarchitectonics. Here we study the effect of electron irradiation on the electronic transport properties of aromatic 5,5'-bis(mercaptomethyl)-2,2'-bipyridine (BPD; HS-CH2-(C5H3N)2-CH2-SH) and electron saturated 1-dodecanethiol (C12; CH3-(CH2)11-SH) molecules self-assembled on an Au (111) surface. We could not create any successful junctions for transport measurements for the electron irradiated C12 SAMs due the deterioration of such molecules with electron saturated nature. For the aromatic molecules, the electron bombardment results in significant reduction of the current despite the electron irradiation-induced intermolecular cross-linking, which should create extra transport channels for charge carriers. The current rectification also reduces after the electron bombardment. In order to interpret the experimental results and give right diagnostics behind the decrease of the current through the junction after electron irradiation, we supplement the experiment with quantum transport calculations using Green's functional formalism in combination with density functional theory. The simulation results show that the reduced current after electron irradiation can be related to the detachment of the molecules from the gold substrate and reattachment to other molecules. The formation of diamond-like structures due to intermolecular-cross linking can also be the reason for the reduced current obtained in the experiments. We have also considered the case when the BPD molecules get broken-conjugated due to the attachment of extra hydrogen atoms to the carbon backbone of the molecule. This structural modification also results in a significant decrease of the current. These findings can be useful in understanding the processes during the electron irradiation of molecular SAMs.
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Affiliation(s)
- Y Tong
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University Doha Qatar
| | - M Alsalama
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University Doha Qatar
| | - G R Berdiyorov
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University Doha Qatar
| | - H Hamoudi
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University Doha Qatar
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3
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Pang B, Iqbal D, Sarfraz A, Biedermann PU, Erbe A. Differences in perchlorate adsorption to azobenzene monolayers on gold formed from thioacetate and thiol precursors. Z PHYS CHEM 2022. [DOI: 10.1515/zpch-2021-3143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Modification of metal surfaces with complex molecules opens interesting opportunities to build additional functionality into these surfaces. In this work, self assembled monolayers (SAMs) based on the same photoswitchable azobenzene motif but with different head groups have been synthesized and their SAMs on Au(111)/Si substrates have been characterized. 3-[(4-phenylazo)phenoxy]propyl thiol (PAPT) and its acetyl group protected analog, 3-[(4-phenylazo)phenoxy]propyl thioacetate (PAPA), have been synthesized. SAMs from PAPT and PAPA have been characterized by infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), ellipsometry and cyclic voltammetry (CV). The SAM-forming units of both SAMs are the same, as confirmed by IR and XPS, and the SAMs have similar surface coverage, as evidenced by analysis of the reductive desorption peaks in CVs. The tilt angle of the azobenzene moiety was ca. 75° with respect to the surface normal as determined by IR spectroscopy, i.e., the molecules are lying quite flat on the gold surface. Despite similar surface coverages, the CVs for PAPT in aqueous perchlorate solution show a typical perchlorate adsorption peak to gold, whereas the corresponding experiments with PAPA show no perchlorate adsorption at all. In conclusion, SAM formation can lead to an increase in the number of electrochemically accessible surface sites on the final, SAM covered surface. Whether the amount of such sites increases or decreases, depends on the precursor. The precursor most likely affects the adsorption mechanism and thus the atomic surface structure of the metal at the metal/SAM interface. Thus, details of the SAM formation mechanism, which is affected by the precursor used, can have quite strong effects on the electrochemical properties, and likely also electrocatalytic properties, of the resulting modified surface.
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Affiliation(s)
- Beibei Pang
- Max-Planck-Institut für Eisenforschung GmbH , Max-Planck-Str., 1, 40237 Düsseldorf , Germany
| | - Danish Iqbal
- Max-Planck-Institut für Eisenforschung GmbH , Max-Planck-Str., 1, 40237 Düsseldorf , Germany
| | - Adnan Sarfraz
- Max-Planck-Institut für Eisenforschung GmbH , Max-Planck-Str., 1, 40237 Düsseldorf , Germany
| | - P. Ulrich Biedermann
- Max-Planck-Institut für Eisenforschung GmbH , Max-Planck-Str., 1, 40237 Düsseldorf , Germany
| | - Andreas Erbe
- Department of Materials Science and Engineering , NTNU, Norwegian University of Science and Technology , 7491 Trondheim , Norway
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4
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Luminescent Self-Assembled Monolayer on Gold Nanoparticles: Tuning of Emission According to the Surface Curvature. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10050176] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Until now, the ability to form a self-assembled monolayer (SAM) on a surface has been investigated according to deposition techniques, which in turn depend on surface-coater interactions. In this paper, we pursued two goals: to form a SAM on a gold nanosurface and to correlate its formation to the nanosurface curvature. To achieve these objectives, gold nanoparticles of different shapes (spheres, rods, and triangles) were functionalized with a luminescent thiolated bipyridine (Bpy-SH), and the SAM formation was studied by investigating the photo-physics of Bpy-SH. We have shown that emission wavelength and excited-state lifetime of Bpy-SH are strongly correlated to the formation of specific aggregates within SAMs, the nature of these aggregates being in close correlation to the shape of the nanoparticles. Micro-Raman spectroscopy investigation was used to test the SERS effect of gold nanoparticles on thiolated bipyridine forming SAMs.
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Berdiyorov G, Hamoudi H. Electronic transport properties of a single biphenyl molecule anchored on Au(111)with sulfur, selenium, and tellurium atoms. J Chem Phys 2022; 156:174701. [DOI: 10.1063/5.0076759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Selenium and tellurium have recently been proposed as alternative to sulfur anchoring groups for self-assembly of organic molecules on noble-metal substrates. Here, we conduct quantum transport calculations for a single biphenyl molecule anchored on Au (111) electrodes with thiolate, selenolate and telluride terminal groups taking into account both dispersive interactions and spin-orbit coupling. The numerical results show that the current through the junction decreases with increasing the mass of the chalcogen atom due to nanoscale charge localization as revealed in transmission eigenstates analysis. The effect of spin-orbit coupling becomes more pronounced with increasing the mass of the chalcogen atom. Clear current rectification is obtained when the molecule is asymmetrically connected to the electrodes using different chalcogen atoms. These findings can be useful inexploring transport properties of organic molecules adsorbed on metallic surfaces using alternative to sulfur chalcogen atoms.
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3D hotspot matrix of Au nanoparticles on Au island film with a spacer layer of dithiol molecules for highly sensitive surface-enhanced Raman spectroscopy. Sci Rep 2021; 11:22399. [PMID: 34789757 PMCID: PMC8599516 DOI: 10.1038/s41598-021-01742-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 11/01/2021] [Indexed: 11/09/2022] Open
Abstract
Engineering of efficient plasmonic hotspots has been receiving great attention to enhance the sensitivity of surface-enhanced Raman scattering (SERS). In the present study, we propose a highly sensitive SERS platform based on Au nanoparticles (AuNPs) on Au island film (AuIF) with a spacer layer of 1,4-benzenedimethanethiol (BDMT). The three-dimensional (3D) hotspot matrix has been rationally designed based on the idea of employing 3D hotspots with a vertical nanogap between AuIF and AuNPs after generating large area two-dimensional hotspots of AuIF. AuNPs@BDMT@AuIF are fabricated by functionalizing BDMT on AuIF and then immobilizing AuNPs. The SERS performance is investigated with Rhodamine 6G as a probe molecule and the determined enhancement factor is 1.3 × 105. The AuNPs@BDMT@AuIF are then employed to detect thiram, which is used as a fungicide, with a detection limit of 13 nM. Our proposed platform thus shows significant potential for use in highly sensitive SERS sensors.
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Abstract
Current studies in the Li-battery field are focusing on building systems with higher energy density than ever before. The path toward this goal, however, should not ignore aspects such as safety, stability, and cycling life. These issues frequently originate from interfacial instability, and therefore, precise surface chemistry that allows for accurate control of material surface and interfaces is much in demand for advanced battery research. Molecular self-assembly as a surface chemistry tool is considered to surpass many conventional coating techniques due to its intrinsic merits such as spontaneous organization, molecular-scale uniformity, and structural diversity. Recent publications have demonstrated the power of self-assembled monolayers (SAMs) in addressing pressing issues in the battery field such as the chemical stability of Li, but many more investigations are needed to fully explore the potential and impact of this technique on energy storage. This perspective is the first of its kind devoted to SAMs in batteries and related materials. Recent research progress on SAMs in batteries is reviewed and mainly falls in two categories, including the improvement of chemical stability and the regulation of nucleation in conversion electrode reactions. Future applications and consideration of SAMs in energy storage are discussed. We believe these summaries and outlooks are highly stimulative and may benefit future advancements in battery chemistry.
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Affiliation(s)
- Ruowei Yi
- i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, P.R. China
| | - Yayun Mao
- i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, P.R. China
| | - Yanbin Shen
- i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, P.R. China
| | - Liwei Chen
- i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, P.R. China.,School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, and in situ Center for Physical Sciences, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
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8
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Liu S, Wang S, Wang H, Lv C, Miao Y, Chen L, Yang S. Gold nanoparticles modified graphene foam with superhydrophobicity and superoleophilicity for oil-water separation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 758:143660. [PMID: 33248768 DOI: 10.1016/j.scitotenv.2020.143660] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/19/2020] [Accepted: 11/08/2020] [Indexed: 06/12/2023]
Abstract
Leakage accidents often occur during the production, transportation, and use of petroleum products, which is a common and serious environmental issue. It is of great significance and challenge to develop efficient materials for oil-water separation. This article introduces a simple and feasible method to prepare high-performance 3D graphene foam (GF) oil-absorbing material. Gold nanoparticles (Au NPs) are loaded on the surface of graphene foam by ion sputtering and then modified with 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT). The prepared graphene sponge is porous with a large specific surface area and excellent water repellency (water contact angle exceeding 150°). The superhydrophobicity of the materials is due to the interaction between the rough structure of gold nanoparticles and the reduction of surface energy by PFDT. These outstanding properties make the functionalized graphene foam have excellent oil absorption capacity, which can even be as high as 25.8 g/g, and it can still maintain high separation performance after 10 cycles of recycling. It is worth noting that the preparation of the material is simple and reusable. Therefore, the prepared graphene foam has the potential as a promising absorbent for oil spill purification.
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Affiliation(s)
- Shuai Liu
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China
| | - Shanshan Wang
- College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi 830052, China
| | - Hui Wang
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Chongjiang Lv
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuchen Miao
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin Chen
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China.
| | - Sudong Yang
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China; Institute for Advanced Study, Chengdu University, Chengdu 610106, China.
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9
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Morphological and Mechanical Characterization of DNA SAMs Combining Nanolithography with AFM and Optical Methods. MATERIALS 2020; 13:ma13132888. [PMID: 32605060 PMCID: PMC7372444 DOI: 10.3390/ma13132888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 06/20/2020] [Accepted: 06/25/2020] [Indexed: 12/31/2022]
Abstract
The morphological and mechanical properties of thiolated ssDNA films self-assembled at different ionic strength on flat gold surfaces have been investigated using Atomic Force Microscopy (AFM). AFM nanoshaving experiments, performed in hard tapping mode, allowed selectively removing molecules from micro-sized regions. To image the shaved areas, in addition to the soft contact mode, we explored the use of the Quantitative Imaging (QI) mode. QI is a less perturbative imaging mode that allows obtaining quantitative information on both sample topography and mechanical properties. AFM analysis showed that DNA SAMs assembled at high ionic strength are thicker and less deformable than films prepared at low ionic strength. In the case of thicker films, the difference between film and substrate Young’s moduli could be assessed from the analysis of QI data. The AFM finding of thicker and denser films was confirmed by X-Ray Photoelectron Spectroscopy (XPS) and Spectroscopic Ellipsometry (SE) analysis. SE data allowed detecting the DNA UV absorption on dense monomolecular films. Moreover, feeding the SE analysis with the thickness data obtained by AFM, we could estimate the refractive index of dense DNA films.
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10
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Hamoudi H, Berdiyorov GR, Ariga K, Esaulov V. Bottom-up fabrication of the multi-layer carbon metal nanosheets. RSC Adv 2020; 10:7987-7993. [PMID: 35492188 PMCID: PMC9049921 DOI: 10.1039/c9ra08177a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 02/08/2020] [Indexed: 01/16/2023] Open
Abstract
Ordered carbon composite materials have great potential for practical applications in many areas such as energy conversion, quantum computing, biotechnologies, and electronics. In this work, we demonstrate a state-of-the-art self-assembly driven building block approach to create new layered carbon–metal composite materials with advanced properties. We fabricate molecular nanocomposites using self-assembled metal intercalated multi-layers of dithiol derivatives. The obtained structures are analysed using different characterization tools (such as X-ray photoelectron and Raman spectroscopy and atomic force microscopy) and their electronic transport properties are studied by four-point probe measurements supplemented by density functional theory calculations. This work demonstrates a new strategy for low-cost, high-yield and eco-friendly nanofabrication of hybrid organometallic membranes. Self-assembly based building block approach for creating layered carbon–metal composite materials.![]()
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Affiliation(s)
- H Hamoudi
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University Doha Qatar
| | - G R Berdiyorov
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University Doha Qatar
| | - K Ariga
- National Institute of Material Science NIMS Tsukuba Japan
| | - V Esaulov
- Institut des Sciences Moléculaires d'Orsay, UMR 8214 CNRS-Université, bât 520, Université Paris Sud, Université Paris Saclay Orsay 91405 France
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11
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Gupta P, Luan J, Wang Z, Cao S, Bae SH, Naik RR, Singamaneni S. On-Demand Electromagnetic Hotspot Generation in Surface-Enhanced Raman Scattering Substrates via "Add-On" Plasmonic Patch. ACS APPLIED MATERIALS & INTERFACES 2019; 11:37939-37946. [PMID: 31525866 DOI: 10.1021/acsami.9b12402] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electromagnetic hotspots at the interstices of plasmonic assemblies are recognized to be the most potent sites for surface-enhanced Raman scattering (SERS). We demonstrate a novel "add-on" electromagnetic hotspot formation technique, which significantly improves the sensitivity of conventional SERS substrates composed of individual plasmonic nanostructures. The novel approach demonstrated here involves the transfer of "plasmonic patch", a transparent, flexible, and conformal elastomeric film adsorbed with plasmonic nanostructures, onto a conventional SERS substrate. The addition of the plasmonic patch onto a conventional SERS substrate following the analyte capture results in the formation of electromagnetic hotspots and hence a large SERS enhancement. The application of the plasmonic patch improves the sensitivity and limit of detection of conventional SERS substrates by up to ∼100-fold. The transfer of the plasmonic patch also effectively transforms the SERS-inactive gold mirror to a highly SERS-active "particle-on-mirror" system. Furthermore, we demonstrate that the "add-on" technique can be effectively utilized for the vapor-phase detection of explosives such as trinitrotoluene (TNT) using peptide recognition elements. We believe that the on-demand hotspot formation approach presented here represents a highly versatile and ubiquitously applicable technology readily expandable to any existing SERS substrate without employing complicated modification.
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Affiliation(s)
- Prashant Gupta
- Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering , Washington University in St. Louis , St. Louis , Missouri 63130 , United States
| | - Jingyi Luan
- Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering , Washington University in St. Louis , St. Louis , Missouri 63130 , United States
| | - Zheyu Wang
- Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering , Washington University in St. Louis , St. Louis , Missouri 63130 , United States
| | - Sisi Cao
- Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering , Washington University in St. Louis , St. Louis , Missouri 63130 , United States
| | - Sang Hyun Bae
- Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering , Washington University in St. Louis , St. Louis , Missouri 63130 , United States
| | - Rajesh R Naik
- 711th Human Performance Wing, Air Force Research Laboratory , Wright-Patterson Air Force Base , Dayton , Ohio 45433 , United States
| | - Srikanth Singamaneni
- Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering , Washington University in St. Louis , St. Louis , Missouri 63130 , United States
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12
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Pinto G, Parisse P, Solano I, Canepa P, Canepa M, Casalis L, Cavalleri O. Functionalizing gold with single strand DNA: novel insight into optical properties via combined spectroscopic ellipsometry and nanolithography measurements. SOFT MATTER 2019; 15:2463-2468. [PMID: 30810150 DOI: 10.1039/c8sm02589d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We have studied the self-assembly of 22-base oligonucleotides bound by a short alkyl thiol linker (C6-ssDNA) on flat Au films. The self-assembled monolayer (SAM) was modified by addition of a spacer (mercaptohexanol, MCH). Molecular depositions were monitored in situ by spectroscopic ellipsometry (SE). SAMs were characterized in a liquid environment by coupling SE (difference spectra method) with Atomic Force Microscope (AFM) measurements. We exploited the biofilm thickness obtained by AFM nanolithography and imaging to solve the refractive index/thickness correlation in optical measurements on ultrathin molecular layers. The combined SE/AFM analysis provided reliable estimates of the thickness and the refractive index of the biofilm in the NIR region (650-1300 nm) and revealed new aspects of DNA molecular organization: exposure to MCH leads to an increase of both film thickness and refractive index, which points to a reorganization of C6-ssDNA film. We show that the contribution of the thiol/Au interface has to be included in the optical model to obtain a more reliable determination of the refractive index of the biofilm in a liquid. The careful, correlative characterization of the mixed C6-ssDNA/MCH SAM represents a key step towards the optimization of a robust detection scheme based on helix-helix hybridization.
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Affiliation(s)
- Giulia Pinto
- OPTMATLAB, Department of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy.
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13
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Venkata Jagadeesh R, Lakshminarayanan V. Effect of solvents on the self-assembly of long chain alkylphosphonic acids on indium tin oxide surface - In situ studies on the adsorption kinetics and electron transfer process. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.01.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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14
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Shimpi JR, Chaudhari VR, Prasad BLV. Ligand-Solvent Compatibility: The Unsung Hero in the Digestive Ripening Story. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13680-13689. [PMID: 30346777 DOI: 10.1021/acs.langmuir.8b02699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Digestive ripening (DR) is a process where a polydisperse nanocrystal (NC) system is converted into a monodisperse one with the aid of thermal heating of NCs in the presence of an excess surface-active organic ligand called digestive ripening agent (DRA) and a solvent. Here, we demonstrate that the solvent-DRA compatibility influences the final size and size distribution of the NCs in a significant manner. Accordingly, in this study, using the DR of gold NCs as the test case with alkanethiol (decanethiol/C10HT) and fluorinated thiol (1 H,1 H,2 H,2 H-perfluorodecanethiol/C10FT) as DRA's and toluene and α,α,α-trifluoro-toluene (TFT) and their combination as solvents, we clearly establish that alkanethiols result in best-quality NCs after DR in toluene while the fluorinated thiols provide reasonably monodispersed NCs in TFT. Our results also ascertain that even when DR is carried out in a mixture of solvents, as long as the compatible solvent is the major component, the DR process results in reasonably monodisperse NCs. As soon as the amount of uncompatible solvent exceeds a threshold limit, there is perceptible increase in the polydispersity of the NCs. We conclude that the polarity of the solvent, which affects the buildup of ligated atoms/clusters, plays a key role in controlling the size distributions of the NCs.
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Affiliation(s)
- Jayesh R Shimpi
- Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
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15
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Plasmonic Nanowires for Wide Wavelength Range Molecular Sensing. MATERIALS 2018; 11:ma11050827. [PMID: 29772804 PMCID: PMC5978204 DOI: 10.3390/ma11050827] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/06/2018] [Accepted: 05/14/2018] [Indexed: 11/17/2022]
Abstract
In this paper, we propose the use of a standing nanowires array, constituted by plasmonic active gold wires grown on iron disks, and partially immersed in a supporting alumina matrix, for surface-enhanced Raman spectroscopy applications. The galvanic process was used to fabricate nanowires in pores of anodized alumina template, making this device cost-effective. This fabrication method allows for the selection of size, diameter, and spatial arrangement of nanowires. The proposed device, thanks to a detailed design analysis, demonstrates a broadband plasmonic enhancement effect useful for many standard excitation wavelengths in the visible and NIR. The trigonal pores arrangement gives an efficiency weakly dependent on polarization. The devices, tested with 633 and 830 nm laser lines, show a significant Raman enhancement factor, up to around 6 × 104, with respect to the flat gold surface, used as a reference for the measurements of the investigated molecules.
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Sharif AM, Mahamod WRW, Abu Bakar N, Rahim NA, Mustafar S, Rosmi MS, Norazan M. The Effect of pH on the Arrangement of 5CB Based Liquid Crystal Containing BDMT-Mercury Complex Using Polarized Optical Microscopy. CHEM LETT 2018. [DOI: 10.1246/cl.171169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Aisyah Mohamad Sharif
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | - Wan Rusmawati Wan Mahamod
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | - Norlaili Abu Bakar
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | - Nurulsaidah Abdul Rahim
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | - Suzaliza Mustafar
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | - Mohamad Saufi Rosmi
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | - Muadz Norazan
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
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17
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Correa-Puerta J, Del Campo V, Henríquez R, Esaulov VA, Hamoudi H, Flores M, Häberle P. Unoccupied Interface and Molecular States in Thiol and Dithiol Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12056-12064. [PMID: 28976204 DOI: 10.1021/acs.langmuir.7b02839] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The electronic structure of self-assembled monolayers (SAMs) formed by thiols of different lengths and dithiol molecules bound to Au(111) has been characterized. Inverse photoemission spectroscopy (IPES) and density functional theory have been used to describe the molecule/Au substrate system. All molecular layers display a clear signal in the IPES data at the edge of the lowest unoccupied system orbital (LUSO), roughly 3 eV above the Fermi level. There is also evidence, in both the experimental data and the calculation, of a finite density of states just below the LUSO edge, which has been recognized as localized at the Au-substrate interface. Regardless of the molecular lengths and in addition to this induced density of interface states, an apparent antibonding Au-S state has been identified in the IPES data for both molecular systems. The main difference between the electronic structures of thiol and dithiol SAMs is a shift in the energy of the antibonding state.
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Affiliation(s)
- Jonathan Correa-Puerta
- Instituto de Física, Pontificia Universidad Católica de Valparaíso , 2373223 Valparaíso, Chile
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
| | - Valeria Del Campo
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
| | - Ricardo Henríquez
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
| | - Vladimir A Esaulov
- Institut des Sciences Moléculaires d'Orsay, UMR 8214, CNRS-Université, bât 520, Université Paris-Saclay, Université-Paris Sud , 91405 Orsay, France
| | - Hicham Hamoudi
- Qatar Environment and Energy Research Institute & Qatar College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation , P.O. Box 5825, Doha, Qatar
| | - Marcos Flores
- Departamento de Física, FCFM, Universidad de Chile , 8370415 Santiago, Chile
| | - Patricio Häberle
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
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18
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Shundo A, Hori K, Tezuka Y, Yamamoto T, Tanaka K. Load-Induced Frictional Transition at a Well-Defined Alkane Loop Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2396-2401. [PMID: 27998061 DOI: 10.1021/acs.langmuir.6b04042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Self-assembled monolayers (SAMs) have attracted considerable attention as a tool to confer desirable properties on material surfaces. So far, molecules used for the SAM formation are generally limited to linear ones and thus chain ends dominate the surface properties. In this study, we have successfully demonstrated unique frictional properties of a SAM composed of alkane loops from cyclic alkanedisulfide on a gold substrate, where both sulfurs are bound to gold. The frictional response was proportional to the load. However, once the load went beyond a threshold value, the frictional response became more dominant. Such a frictional transition was reversible and repeatable and was not discerned for a corresponding SAM composed of n-alkyl chains. The load-induced change in the frictional response from the alkane loops could be associated with the conformational change of the alkane loops. The present results differ from most studies, in which the surface properties are designed on the basis of functional chain end groups.
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Affiliation(s)
| | | | - Yasuyuki Tezuka
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology , Tokyo 152-8552, Japan
| | - Takuya Yamamoto
- Division of Applied Chemistry, Hokkaido University , Sapporo 060-8628, Japan
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19
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Euti EM, Vélez-Romero P, Leiva EPM, Macagno VA, Paredes-Olivera PA, Patrito EM, Cometto FP. The Role of Tris(2-carboxyethyl)phosphine Reducing Agent in the Controlled Formation of α,ω-Alkanedithiols Monolayers on Au(111) with Monocoordinated and Bicoordinated Configurations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9428-9436. [PMID: 27579725 DOI: 10.1021/acs.langmuir.6b02079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The addition of the reducing agent tris(2-carboxyethyl) phosphine (TCEP) during the formation of α,ω-alkanedithiols monolayers on Au(111) using the immersion method produces the assembly of monolayers with bicoordinated molecules (both S-terminal groups bound to the surface) that have a reductive desorption potential that is more positive than for monolayers with monocoordinated molecules in a standing up configuration. We show that the use of TCEP either during formation of the monolayer or as a post treatment procedure allows the controlled formation of monolayers with bicoordinated or monocoordinated configurations. Density functional theory (DFT) calculations were performed to elucidate the role of TCEP in the formation of the bicoordinated configuration. We investigated the TCEP-dithiol interaction in ethanol solvent as well as the coadsorption of trimethylphosphine with 1,2-ethanedithiol on Au(111). The Brønsted base character of the phosphine facilitates the H exchange from the -SH groups of the dithiol to the phosphorus atom of TCEP with very low activation energy barriers, thus allowing the thiolate groups to bind to the Au(111) surface, thus yielding the bicoordinated configuration. Dithiol lifting mechanisms such as H exchange between S atoms and the formation of intra/inter layer disulfide bonds have much higher energy barriers.
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Affiliation(s)
- Esteban M Euti
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
| | - Patricio Vélez-Romero
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
| | - Ezequiel P M Leiva
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
| | - Vicente A Macagno
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
| | - Patricia A Paredes-Olivera
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
| | - E Martín Patrito
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
| | - Fernando P Cometto
- Instituto de Investigaciones en Físico Química de Córdoba (INFIQC) CONICET-UNC, †Departamento de Fisicoquímica, and ‡Departamento de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba Argentina
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20
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Mescola A, Canale C, Prato M, Diaspro A, Berdondini L, Maccione A, Dante S. Specific Neuron Placement on Gold and Silicon Nitride-Patterned Substrates through a Two-Step Functionalization Method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6319-6327. [PMID: 27268249 DOI: 10.1021/acs.langmuir.6b01352] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The control of neuron-substrate adhesion has been always a challenge for fabricating neuron-based cell chips and in particular for multielectrode array (MEA) devices, which warrants the investigation of the electrophysiological activity of neuronal networks. The recent introduction of high-density chips based on the complementary metal oxide semiconductor (CMOS) technology, integrating thousands of electrodes, improved the possibility to sense large networks and raised the challenge to develop newly adapted functionalization techniques to further increase neuron electrode localization to avoid the positioning of cells out of the recording area. Here, we present a simple and straightforward chemical functionalization method that leads to the precise and exclusive positioning of the neural cell bodies onto modified electrodes and inhibits, at the same time, cellular adhesion in the surrounding insulator areas. Different from other approaches, this technique does not require any adhesion molecule as well as complex patterning technique such as μ-contact printing. The functionalization was first optimized on gold (Au) and silicon nitride (Si3N4)-patterned surfaces. The procedure consisted of the introduction of a passivating layer of hydrophobic silane molecules (propyltriethoxysilane [PTES]) followed by a treatment of the Au surface using 11-amino-1-undecanethiol hydrochloride (AT). On model substrates, well-ordered neural networks and an optimal coupling between a single neuron and single micrometric functionalized Au surface were achieved. In addition, we presented the preliminary results of this functionalization method directly applied on a CMOS-MEA: the electrical spontaneous spiking and bursting activities of the network recorded for up to 4 weeks demonstrate an excellent and stable neural adhesion and functional behavior comparable with what expected using a standard adhesion factor, such as polylysine or laminin, thus demonstrating that this procedure can be considered a good starting point to develop alternatives to the traditional chip coatings to provide selective and specific neuron-substrate adhesion.
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Affiliation(s)
- Andrea Mescola
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Claudio Canale
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Mirko Prato
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Alberto Diaspro
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Luca Berdondini
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Alessandro Maccione
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
| | - Silvia Dante
- Department of Nanophysics, ‡Department of Nanochemistry, and §Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia (IIT) , Via Morego 30, 16163 Genova, Italy
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21
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Solano I, Parisse P, Cavalleri O, Gramazio F, Casalis L, Canepa M. Investigating organic multilayers by spectroscopic ellipsometry: specific and non-specific interactions of polyhistidine with NTA self-assembled monolayers. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:544-53. [PMID: 27335745 PMCID: PMC4901546 DOI: 10.3762/bjnano.7.48] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 03/31/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND A versatile strategy for protein-surface coupling in biochips exploits the affinity for polyhistidine of the nitrilotriacetic acid (NTA) group loaded with Ni(II). Methods based on optical reflectivity measurements such as spectroscopic ellipsometry (SE) allow for label-free, non-invasive monitoring of molecule adsorption/desorption at surfaces. RESULTS This paper describes a SE study about the interaction of hexahistidine (His6) on gold substrates functionalized with a thiolate self-assembled monolayer bearing the NTA end group. By systematically applying the difference spectra method, which emphasizes the small changes of the ellipsometry spectral response upon the nanoscale thickening/thinning of the molecular film, we characterized different steps of the process such as the NTA-functionalization of Au, the adsorption of the His6 layer and its eventual displacement after reaction with competitive ligands. The films were investigated in liquid, and ex situ in ambient air. The SE investigation has been complemented by AFM measurements based on nanolithography methods (nanografting mode). CONCLUSION Our approach to the SE data, exploiting the full spectroscopic potential of the method and basic optical models, was able to provide a picture of the variation of the film thickness along the process. The combination of δΔ i +1 ,i (λ), δΨ i +1 ,i (λ) (layer-addition mode) and δΔ(†) i ', i +1(λ), δΨ(†) i ', i +1(λ) (layer-removal mode) difference spectra allowed us to clearly disentangle the adsorption of His6 on the Ni-free NTA layer, due to non specific interactions, from the formation of a neatly thicker His6 film induced by the Ni(II)-loading of the NTA SAM.
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Affiliation(s)
- Ilaria Solano
- Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genova, Italy
| | - Pietro Parisse
- Elettra Sincrotrone Trieste S.C.p.A., s.s. 14 km 163,5 in Area Science Park, Basovizza, Trieste, Italy
| | - Ornella Cavalleri
- Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genova, Italy
| | - Federico Gramazio
- Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genova, Italy
| | - Loredana Casalis
- Elettra Sincrotrone Trieste S.C.p.A., s.s. 14 km 163,5 in Area Science Park, Basovizza, Trieste, Italy
| | - Maurizio Canepa
- Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genova, Italy
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22
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Tong Y, Jiang T, Bendounan A, Harish MNK, Giglia A, Kubsky S, Sirotti F, Pasquali L, Sampath S, Esaulov VA. Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:263-277. [PMID: 26977383 PMCID: PMC4778531 DOI: 10.3762/bjnano.7.24] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 02/03/2016] [Indexed: 06/05/2023]
Abstract
This report examines the assembly of chalcogenide organic molecules on various surfaces, focusing on cases when chemisorption is accompanied by carbon-chalcogen atom-bond scission. In the case of alkane and benzyl chalcogenides, this induces formation of a chalcogenized interface layer. This process can occur during the initial stages of adsorption and then, after passivation of the surface, molecular adsorption can proceed. The characteristics of the chalcogenized interface layer can be significantly different from the metal layer and can affect various properties such as electron conduction. For chalcogenophenes, the carbon-chalcogen atom-bond breaking can lead to opening of the ring and adsorption of an alkene chalcogenide. Such a disruption of the π-electron system affects charge transport along the chains. Awareness about these effects is of importance from the point of view of molecular electronics. We discuss some recent studies based on X-ray photoelectron spectroscopy that shed light on these aspects for a series of such organic molecules.
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Affiliation(s)
- Yongfeng Tong
- Institut des Sciences Moléculaires d’Orsay, UMR 8214 CNRS-Université Paris Sud, Université Paris-Saclay, F-91405 Orsay, France
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Tingming Jiang
- Institut des Sciences Moléculaires d’Orsay, UMR 8214 CNRS-Université Paris Sud, Université Paris-Saclay, F-91405 Orsay, France
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
- Dipartimento di Ingegneria ‘E. Ferrari’, Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
| | - Azzedine Bendounan
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | | | - Angelo Giglia
- CNR-IOM, s.s.14, km 163.5 in Area Science Park, 34012 Trieste, Italy
| | - Stefan Kubsky
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Fausto Sirotti
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Luca Pasquali
- Dipartimento di Ingegneria ‘E. Ferrari’, Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
- CNR-IOM, s.s.14, km 163.5 in Area Science Park, 34012 Trieste, Italy
- Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
| | - Srinivasan Sampath
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, CV Raman Avenue, Bangalore 560 012, India
| | - Vladimir A Esaulov
- Institut des Sciences Moléculaires d’Orsay, UMR 8214 CNRS-Université Paris Sud, Université Paris-Saclay, F-91405 Orsay, France
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Jiang T, Tong Y, Bendounan A, Nicolas F, Kubsky S, Esaulov VA. Selenium and benzeneselenol interaction with Cu(111). RSC Adv 2016. [DOI: 10.1039/c6ra17334a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Benzeneselenol (BSe) and Selenium interaction with a Cu(111) surface was studied to investigate adsorption characteristics, molecular orientation and possibility of Se–C bond scission leading to atomic Se presence on the surface.
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Affiliation(s)
- Tingming Jiang
- Institut des Sciences Moléculaires d'Orsay
- Université-Paris Sud
- 91405 Orsay
- France
- CNRS
| | - Yongfeng Tong
- Institut des Sciences Moléculaires d'Orsay
- Université-Paris Sud
- 91405 Orsay
- France
- CNRS
| | - Azzedine Bendounan
- Synchrotron SOLEIL
- L'Orme des Merisiers
- F-91192 Gif-sur-Yvette Cedex
- France
| | - François Nicolas
- Synchrotron SOLEIL
- L'Orme des Merisiers
- F-91192 Gif-sur-Yvette Cedex
- France
| | - Stefan Kubsky
- Synchrotron SOLEIL
- L'Orme des Merisiers
- F-91192 Gif-sur-Yvette Cedex
- France
| | - Vladimir A. Esaulov
- Institut des Sciences Moléculaires d'Orsay
- Université-Paris Sud
- 91405 Orsay
- France
- CNRS
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24
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Jia J, Kara A, Pasquali L, Bendounan A, Sirotti F, Esaulov VA. On sulfur core level binding energies in thiol self-assembly and alternative adsorption sites: An experimental and theoretical study. J Chem Phys 2015; 143:104702. [PMID: 26374051 DOI: 10.1063/1.4929350] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Characteristic core level binding energies (CLBEs) are regularly used to infer the modes of molecular adsorption: orientation, organization, and dissociation processes. Here, we focus on a largely debated situation regarding CLBEs in the case of chalcogen atom bearing molecules. For a thiol, this concerns the case when the CLBE of a thiolate sulfur at an adsorption site can be interpreted alternatively as due to atomic adsorption of a S atom, resulting from dissociation. Results of an investigation of the characteristics of thiol self-assembled monolayers (SAMs) obtained by vacuum evaporative adsorption are presented along with core level binding energy calculations. Thiol ended SAMs of 1,4-benzenedimethanethiol (BDMT) obtained by evaporation on Au display an unconventional CLBE structure at about 161.25 eV, which is close to a known CLBE of a S atom on Au. Adsorption and CLBE calculations for sulfur atoms and BDMT molecules are reported and allow delineating trends as a function of chemisorption on hollow, bridge, and atop sites and including the presence of adatoms. These calculations suggest that the 161.25 eV peak is due to an alternative adsorption site, which could be associated to an atop configuration. Therefore, this may be an alternative interpretation, different from the one involving the adsorption of atomic sulfur resulting from the dissociation process of the S-C bond. Calculated differences in S(2p) CLBEs for free BDMT molecules, SH group sulfur on top of the SAM, and disulfide are also reported to clarify possible errors in assignments.
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Affiliation(s)
- Juanjuan Jia
- Institut des Sciences Moléculaires d'Orsay, Université-Paris Sud, 91405 Orsay, France
| | - Abdelkader Kara
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - Luca Pasquali
- Dipartimento di Ingegneria "E. Ferrari," Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
| | - Azzedine Bendounan
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Fausto Sirotti
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Vladimir A Esaulov
- Institut des Sciences Moléculaires d'Orsay, Université-Paris Sud, 91405 Orsay, France
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25
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Solano I, Parisse P, Gramazio F, Cavalleri O, Bracco G, Castronovo M, Casalis L, Canepa M. Spectroscopic ellipsometry meets AFM nanolithography: about hydration of bio-inert oligo(ethylene glycol)-terminated self assembled monolayers on gold. Phys Chem Chem Phys 2015; 17:28774-81. [PMID: 26445913 DOI: 10.1039/c5cp04028k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An accurate thickness determination provides insight into the complex vertical morphology of OEG-terminated SAMs.
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Affiliation(s)
- Ilaria Solano
- Dipartimento di Fisica
- Università di Genova and CNISM
- Genova
- Italy
| | | | | | | | | | - Matteo Castronovo
- Department of Medical and Biological Sciences – University of Udine
- Udine
- Italy
| | | | - Maurizio Canepa
- Dipartimento di Fisica
- Università di Genova and CNISM
- Genova
- Italy
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26
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Sharif AM, Laffir FR, Buckley DN, Silien C. Distinct self-assembly of dithiol monolayers on Au(111) in water and hexane. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.06.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Hamoudi H. Crossbar nanoarchitectonics of the crosslinked self-assembled monolayer. NANOSCALE RESEARCH LETTERS 2014; 9:287. [PMID: 24994952 PMCID: PMC4067121 DOI: 10.1186/1556-276x-9-287] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2014] [Accepted: 04/08/2014] [Indexed: 05/23/2023]
Abstract
A bottom-up approach was devised to build a crossbar device using the crosslinked SAM of the 5,5'-bis (mercaptomethyl)-2,2'-bipyridine-Ni(2+) (BPD- Ni(2+)) on a gold surface. To avoid metal diffusion through the organic film, the author used (i) nanoscale bottom electrodes to reduce the probability of defects on the bottom electrodes and (ii) molecular crosslinked technology to avoid metal diffusion through the SAMs. The properties of the crosslinked self-assembled monolayer were determined by XPS. I-V characteristics of the device show thermally activated hopping transport. The implementation of this type of architecture will open up new vistas for a new class of devices for transport, storage, and computing.
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Affiliation(s)
- Hicham Hamoudi
- International Center for Young Scientists (ICYS), 1-1 Namiki, Tsukuba 305-0044, Japan
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
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Hamoudi H. Bottom-up nanoarchitectonics of two-dimensional freestanding metal doped carbon nanosheet. RSC Adv 2014. [DOI: 10.1039/c4ra02846e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Fabrication of freestanding carbon–metal-sulfide nanosheet from a self-assembled monolayer.
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Affiliation(s)
- Hicham Hamoudi
- International Center for Young Scientists (ICYS)
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba, Japan
- International Center for Materials Nanoarchitectonics (WPI-MANA)
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29
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Hamoudi H, Uosaki K, Ariga K, Esaulov VA. Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance. RSC Adv 2014. [DOI: 10.1039/c4ra05476h] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A study of the configuration and the conductivity of the self-assembly of silver intercalated dithiol (DTT) monolayers and multilayers on gold is presented.
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Affiliation(s)
- Hicham Hamoudi
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba, Japan
| | - Kohei Uosaki
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba, Japan
| | - Katsuhiko Ariga
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba, Japan
| | - Vladimir A. Esaulov
- Institut des Sciences Moléculaires d'Orsay
- Unité mixte de Recherche CNRS-Université Paris Sud
- UMR 8214
- Université Paris Sud
- Orsay 91405, France
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30
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Shubha HN, Venkatesha TV, Vathsala K, Pavitra MK, Kumar MKP. Preparation of self assembled sodium oleate monolayer on mild steel and its corrosion inhibition behavior in saline water. ACS APPLIED MATERIALS & INTERFACES 2013; 5:10738-10744. [PMID: 24144468 DOI: 10.1021/am4028857] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A self assembled monolayer (SAM) of sodium oleate was generated on mild steel by the dip coating method. Formation of the SAM on mild steel was examined using Infrared Reflection Absorption Spectroscopy (IRRAS) and contact angle measurements. The chemical and anticorrosive properties of the SAM were analyzed using different techniques. IRRAS and water contact angle data revealed the crystallinity and chemical stability of the SAM modified mild steel. The electrochemical measurements showed that the mild steel with the sodium oleate derived SAM exhibited better corrosion resistance in saline water. The effect of temperature and pH on the SAM formation and its anti corrosion ability was explored.
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Affiliation(s)
- H N Shubha
- Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University , Shankaraghatta 577451, Karnataka, India
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31
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Ito E, Kang H, Lee D, Park JB, Hara M, Noh J. Spontaneous desorption and phase transitions of self-assembled alkanethiol and alicyclic thiol monolayers chemisorbed on Au(111) in ultrahigh vacuum at room temperature. J Colloid Interface Sci 2013; 394:522-9. [DOI: 10.1016/j.jcis.2012.12.035] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 12/16/2012] [Accepted: 12/17/2012] [Indexed: 10/27/2022]
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32
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Cometto FP, Ruano G, Ascolani H, Zampieri G. Adlayers of alkanedithiols on Au(111): effect of disulfide reducing agent. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1400-1406. [PMID: 23281745 DOI: 10.1021/la3036067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
High-resolution photoemission spectroscopy is used to characterize adlayers of ethane-, hexane-, and nonanedithiol molecules grown on Au(111) surfaces by the immersion method. The effect of using a reducing agent during and after the immersion to inhibit or eliminate S-S bonds is investigated. Our results demonstrate that immersion 24 h in millimolar dithiol ethanolic solutions gives rise to the formation of multilayers; this effect is more pronounced in the case of ethanedithiol, the shortest molecule. A post-treatment with a disulfide reducing agent is effective to produce monolayers of standing-up molecules; this effect is again more pronounced in the case of ethanedithiol. Finally, the immersion 24 h in a solution containing dithiol and the reducing agent gives an unexpected result: most molecules remain adsorbed in the lying-down configuration; in this case, the almost complete suppression of the standing-up phase occurs equally with the three types of molecules, which suggests that the formation of S-S bonds must be important for the lifting of the molecules.
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Affiliation(s)
- F P Cometto
- Departamento de Fisico Química, Instituto de Fisicoquímica de Córdoba (INFIQC), Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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33
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Canepa M, Maidecchi G, Toccafondi C, Cavalleri O, Prato M, Chaudhari V, Esaulov VA. Spectroscopic ellipsometry of self assembled monolayers: interface effects. The case of phenyl selenide SAMs on gold. Phys Chem Chem Phys 2013; 15:11559-65. [DOI: 10.1039/c3cp51304a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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34
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Ford K, Battersby BJ, Wood BJ, Gentle IR. The production and verification of pristine semi-fluorinated thiol monolayers on gold. J Colloid Interface Sci 2012; 370:162-9. [DOI: 10.1016/j.jcis.2011.10.081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 10/21/2011] [Accepted: 10/24/2011] [Indexed: 10/14/2022]
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35
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Toccafondi C, Prato M, Barborini E, Vinati S, Maidecchi G, Penco A, Cavalleri O, Bisio F, Canepa M. Yeast Cytochrome c Monolayer on Flat and Nanostructured Gold Films Studied by UV–Vis Spectroscopic Ellipsometry. BIONANOSCIENCE 2011. [DOI: 10.1007/s12668-011-0024-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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36
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Ishitsuka M, Hiaki T, Osaka N. Coadsorption self-assembled monolayers of trithiocyanuric acid and 1,3,5-benzenetrithiol on an evaporated silver film. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.07.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Toccafondi C, Prato M, Maidecchi G, Penco A, Bisio F, Cavalleri O, Canepa M. Optical properties of Yeast Cytochrome c monolayer on gold: an in situ spectroscopic ellipsometry investigation. J Colloid Interface Sci 2011; 364:125-32. [PMID: 21920531 DOI: 10.1016/j.jcis.2011.07.097] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Revised: 07/29/2011] [Accepted: 07/30/2011] [Indexed: 11/18/2022]
Abstract
The adsorption of Yeast Cytochrome c (YCC) on well defined, flat gold substrates has been studied by Spectroscopic Ellipsometry (SE) in the 245-1000 nm wavelength range. The investigation has been performed in aqueous ambient at room temperature, focusing on monolayer-thick films. In situ δΨ and δΔ difference spectra have shown reproducibly well-defined features related to molecular optical absorptions typical of the so-called heme group. The data have been reproduced quantitatively by a simple isotropic optical model, accounting for the molecular absorption spectrum and film-substrate interface effects. The simulations allowed a reliable estimate of the film thickness and the determination of the position and the shape of the so-called Soret absorption peak that, within the experimental uncertainty, is the same found for molecules in liquid. These findings suggest that YCC preserves its native structure upon adsorption. The same optical model was able to reproduce also ex situ results on rinsed and dried samples, dominated by the spectral features associated to the polypeptide chain that tend to overwhelm the heme absorption features.
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Affiliation(s)
- Chiara Toccafondi
- CNISM and Dipartimento di Fisica, Universitá di Genova, Via Dodecaneso 33, 16146 Genova, Italy
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38
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Bisio F, Prato M, Barborini E, Canepa M. Interaction of alkanethiols with nanoporous cluster-assembled Au films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8371-8376. [PMID: 21627142 DOI: 10.1021/la200425z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This article presents a study of the interaction of octadecanethiol molecules (C(18)) with nanoporous cluster-assembled gold films under a liquid environment based on a combined spectroscopic ellipsometry and X-ray photoelectron spectroscopy investigation. By comparing the optical response, following the deposition of C(18), of cluster-assembled films with varying degrees of porosity with that of flat surfaces and by resolving the corresponding features of the molecule-Au bond, we have been able to define the conditions that either favor molecular in-depth diffusion into the pores or promote the formation of a molecular self-assembled monolayer (SAM) restricted to the film surface. In the presence of abundant open pores, C(18) molecules strongly diffuse within the film interior and bind to the pore walls, whereas in the presence of porous films with less abundant open pores we have observed that the molecules tend to remain confined to the surface region, adopting a SAM-like configuration.
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Affiliation(s)
- F Bisio
- CNR-SPIN, C. so Perrone 24, I-16152 Genova, Italy.
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39
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Pasquali L, Terzi F, Seeber R, Nannarone S, Datta D, Dablemont C, Hamoudi H, Canepa M, Esaulov VA. UPS, XPS, and NEXAFS study of self-assembly of standing 1,4-benzenedimethanethiol SAMs on gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4713-4720. [PMID: 21405080 DOI: 10.1021/la105063u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report a study of the self-assembly of 1,4-benzenedimethanethiol monolayers on gold formed in n-hexane solution held at 60 °C for 30 min and in dark conditions. The valence band characteristics, the thickness of the layer, and the orientation of the molecules were analyzed at a synchrotron using high resolution photoelectron spectroscopy and near edge X-ray adsorption spectroscopy. These measurements unambiguously attest the formation of a single layer with molecules arranged in the upright position and presenting a free -SH group at the outer interface. Near edge X-ray absorption fine structure (NEXAFS) measurements suggest that the molecular axis is oriented at 24° with respect to the surface normal. In addition, valence band features could be successfully associated to specific molecular orbital contributions thanks to the comparison with theoretically calculated density of states projected on the different molecular units.
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Affiliation(s)
- Luca Pasquali
- Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Università di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena, Italy
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