1
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Liao CL, Faizanuddin SM, Haruyama J, Liao WS, Wen YC. Effects of chain-chain interaction on the configuration of short-chain alkanethiol self-assembled monolayers on a metal surface. J Chem Phys 2024; 160:214711. [PMID: 38836785 DOI: 10.1063/5.0214261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/22/2024] [Indexed: 06/06/2024] Open
Abstract
Surface-specific sum frequency generation vibrational spectroscopy is applied to study the molecular configuration of short-chain n-alkanethiol self-assembled monolayers (SAMs with n = 2-6) on the Au surface. For monolayers with n≥ 3, the alkanethiols are upright-oriented, with the CH3 tilt angle varying between ∼33° and ∼46° in clear even-odd dependency. The ethanethiol monolayer (n = 2) is, however, found to exhibit a distinct lying-down configuration with a larger methyl tilt angle (67°-79°) and a smaller CH2 tilt angle (56°-68°). Such a unique configurational transition from n = 2 to n≥ 3 discloses the steric effect owing to chain-chain interaction among neighboring molecules. Through density functional theory calculations, the transition is further confirmed to be energetically favorable for thiols on a defective reconstructed Au(111) surface but not on the pristine one. Our study highlights the roles of the chain-chain interaction and the substrate surface atomic structure when organizing SAMs, offering a strategic pathway for exploiting their applications.
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Affiliation(s)
- Chia-Li Liao
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - Syed Mohammed Faizanuddin
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
- Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Jun Haruyama
- Solid State Chemistry Laboratory, Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - Wei-Ssu Liao
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
- Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Chieh Wen
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
- Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan
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2
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Chen X, Dhirani AA. Thin Film Resistance Gating by Redox Charge Exchange: Evidence for a Quantum Transition State. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38710102 DOI: 10.1021/acsami.4c02058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Field effect transistors (FETs) and related devices have enabled tremendous advances in electronics, as well as studies of fundamental phenomena. FETs are classically actuated as fields charge/discharge materials, thereby modifying their resistance. Here, we develop charge exchange transistors (CETs) that comprise thin films whose resistance is modified by quantum charge exchange processes, e.g., redox and bonding. We first use CETs to probe the metallocene-thin film interaction during cyclic voltammetry. Remarkably, CETs reveal transient resistance peaks associated with charge transfer during both oxidation and reduction. Our data combined with kinetics and density functional theory modeling are consistent with a multistep redox pathway, including the formation/destruction of a quantum transition state that overlaps molecule + thin film band states. As a further proof-of-principle demonstration, we also use CETs to monitor n-alkanethiol self-assembly on thin Au films in real-time. CETs exhibit monotonic resistance increase consistent with previously reported fast-then-slow kinetics attributed to thiol-thin film bond formation (charge localization) and etching and/or molecule reorganization.
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Affiliation(s)
- Xiaoyang Chen
- Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
| | - Al-Amin Dhirani
- Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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3
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Choi J, Hwang DS, Lim C, Lee DW. Interaction mechanism between low molecular weight chitosan nanofilm and functionalized surfaces in aqueous solutions. Carbohydr Polym 2024; 324:121504. [PMID: 37985092 DOI: 10.1016/j.carbpol.2023.121504] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 10/13/2023] [Accepted: 10/15/2023] [Indexed: 11/22/2023]
Abstract
Low-molecular-weight chitosan (LMW chitosan, <10 kDa) have a significant potential for biomedical applications (e.g., antimicrobial and gene/drug delivery) because of their higher water solubility at pH values ranging from 3.0 to 8.5, compared to that of the high-molecular-weight (>100 kDa) chitosan. A comprehensive understanding of the LMW interaction mechanism with specific functional groups is necessary to predict their binding efficiency to other molecules for effectively utilizing their potential within biological systems. In this study, we used a surface forces apparatus (SFA) to investigate molecular interactions between LMW chitosan and four different functionalized self-assembled monolayers (SAMs) in aqueous solutions at pH values of 3.0, 6.5, and 8.5. Chitosan exhibited the strongest interaction energy with methyl-terminated SAM (CH3-SAM), indicating the significance of hydrophobic interaction. Many chitin/chitosan fibers in nature bind polyphenols (e.g., eumelanin) to form robust composites, which can be attributed to the strong attraction between chitosan and phenyl-SAM, presumably caused by cation-π interactions. These findings demonstrate the potential of modulating the magnitude of the interaction energy by controlling the solution pH and types of targeted functional groups to realize the optimal design of chitosan-based hybrid composites with other biomolecules or synthetic materials.
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Affiliation(s)
- Jieun Choi
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Dong Soo Hwang
- Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongsangbuk-do 37673, Republic of Korea; R&D Center, ANPOLY INC., Pohang, Gyeongsangbuk-do 37666, Republic of Korea; Institute for Convergence Research and Education in Advanced Technology, Yonsei University International Campus I-CREATE, Incheon 21983, South Korea
| | - Chanoong Lim
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
| | - Dong Woog Lee
- School of Energy & Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
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4
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Liyanage CD, Ortiz-Garcia JJ, Struckmeier A, Kienzler M, Quardokus RC. Light-induced Photoswitching of 4-(Phenylazo)benzoic Acid on Au(111). Chemphyschem 2023; 24:e202300160. [PMID: 37369072 DOI: 10.1002/cphc.202300160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 06/13/2023] [Accepted: 06/19/2023] [Indexed: 06/29/2023]
Abstract
Photochromic molecules can undergo a reversible conversion between two isomeric forms upon exposure to external stimuli such as electromagnetic radiation. A significant physical transformation accompanying the photoisomerization process defines them as photoswitches, with potential applications in various molecular electronic devices. As such, a detailed understanding of the photoisomerization process on surfaces and the influence of the local chemical environment on switching efficiency is essential. Herein, we use scanning tunneling microscopy to observe the photoisomerization of 4-(phenylazo)benzoic acid (PABA) assembled on Au(111) in kinetically constrained metastable states guided by pulse deposition. Photoswitching is observed at low molecular density and is absent in tight-packed islands. Furthermore, switching events were noted in PABA molecules coadsorbed in a host octanethiol monolayer, suggesting an influence of the surrounding chemical environment on photoswitching efficiency.
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Affiliation(s)
| | - José J Ortiz-Garcia
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT, USA
| | - Annalena Struckmeier
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT, USA
| | - Michael Kienzler
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT, USA
| | - Rebecca C Quardokus
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT, USA
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5
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Wu H, Li G, Hou J, Sotthewes K. Probing surface properties of organic molecular layers by scanning tunneling microscopy. Adv Colloid Interface Sci 2023; 318:102956. [PMID: 37393823 DOI: 10.1016/j.cis.2023.102956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 06/21/2023] [Accepted: 06/23/2023] [Indexed: 07/04/2023]
Abstract
In view of the relevance of organic thin layers in many fields, the fundamentals, growth mechanisms, and dynamics of thin organic layers, in particular thiol-based self-assembled monolayers (SAMs) on Au(111) are systematically elaborated. From both theoretical and practical perspectives, dynamical and structural features of the SAMs are of great intrigue. Scanning tunneling microscopy (STM) is a remarkably powerful technique employed in the characterization of SAMs. Numerous research examples of investigation about the structural and dynamical properties of SAMs using STM, sometimes combined with other techniques, are listed in the review. Advanced options to enhance the time resolution of STM are discussed. Additionally, we elaborate on the extremely diverse dynamics of various SAMs, such as phase transitions and structural changes at the molecular level. In brief, the current review is expected to supply a better understanding and novel insights regarding the dynamical events happening in organic SAMs and how to characterize these processes.
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Affiliation(s)
- Hairong Wu
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China; Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China.
| | - Genglin Li
- College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jirui Hou
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China; Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Kai Sotthewes
- Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, the Netherlands.
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6
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Dongiovanni P, Meroni M, Casati S, Goldoni R, Thomaz DV, Kehr NS, Galimberti D, Del Fabbro M, Tartaglia GM. Salivary biomarkers: novel noninvasive tools to diagnose chronic inflammation. Int J Oral Sci 2023; 15:27. [PMID: 37386003 DOI: 10.1038/s41368-023-00231-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 05/23/2023] [Accepted: 06/05/2023] [Indexed: 07/01/2023] Open
Abstract
Several chronic disorders including type 2 diabetes (T2D), obesity, heart disease and cancer are preceded by a state of chronic low-grade inflammation. Biomarkers for the early assessment of chronic disorders encompass acute phase proteins (APP), cytokines and chemokines, pro-inflammatory enzymes, lipids and oxidative stress mediators. These substances enter saliva through the blood flow and, in some cases, there is a close relation between their salivary and serum concentration. Saliva can be easily collected and stored with non-invasive and cost-saving procedures, and it is emerging the concept to use it for the detection of inflammatory biomarkers. To this purpose, the present review aims to discuss the advantages and challenges of using standard and cutting-edge techniques to discover salivary biomarkers which may be used in diagnosis/therapy of several chronic diseases with inflammatory consequences with the pursuit to possibly replace conventional paths with detectable soluble mediators in saliva. Specifically, the review describes the procedures used for saliva collection, the standard approaches for the measurement of salivary biomarkers and the novel methodological strategies such as biosensors to improve the quality of care for chronically affected patients.
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Affiliation(s)
- Paola Dongiovanni
- Medicine and Metabolic Diseases, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Marica Meroni
- Medicine and Metabolic Diseases, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Sara Casati
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy.
| | - Riccardo Goldoni
- Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, Italy
- Istituto di Elettronica e di Ingegneria dell'Informazione e delle Telecomunicazioni, CNR, Pisa, Italy
| | - Douglas Vieira Thomaz
- Laboratory of Medicinal Pharmaceutical Chemistry, Faculty of Pharmacy, Federal University of Goiás, Goiânia, GO, Brazil
| | - Nermin Seda Kehr
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
- Department of Chemistry, İzmir Institute of Technology, Gülbahçe Kampüsü, Urla İzmir, Turkey
| | - Daniela Galimberti
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
- Neurology-Neurodegenerative Diseases, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Massimo Del Fabbro
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
- UOC Maxillo-Facial Surgery and Dentistry Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Gianluca M Tartaglia
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
- UOC Maxillo-Facial Surgery and Dentistry Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan, Italy
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7
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Khan M, Zhao B, Wu W, Zhao M, Bi Y, Hu Q. Distance-based microfluidic assays for instrument-free visual point-of-care testing. Trends Analyt Chem 2023. [DOI: 10.1016/j.trac.2023.117029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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8
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Stern Bauer T, Yakobi R, Hurevich M, Yitzchaik S, Hayouka Z. Impedimetric Bacterial Detection Using Random Antimicrobial Peptide Mixtures. SENSORS (BASEL, SWITZERLAND) 2023; 23:561. [PMID: 36679359 PMCID: PMC9866871 DOI: 10.3390/s23020561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/19/2022] [Accepted: 12/28/2022] [Indexed: 06/17/2023]
Abstract
The biosensing of bacterial pathogens is of a high priority. Electrochemical biosensors are an important future tool for rapid bacteria detection. A monolayer of bacterial-binding peptides can serve as a recognition layer in such detection devices. Here, we explore the potential of random peptide mixtures (RPMs) composed of phenylalanine and lysine in random sequences and of controlled length, to form a monolayer that can be utilized for sensing. RPMs were found to assemble in a thin and diluted layer that attracts various bacteria. Faradaic electrochemical impedance spectroscopy was used with modified gold electrodes to measure the charge-transfer resistance (RCT) caused due to the binding of bacteria to RPMs. Pseudomonas aeruginosa was found to cause the most prominent increase in RCT compared to other model bacteria. We show that the combination of highly accessible antimicrobial RPMs and electrochemical analysis can be used to generate a new promising line of bacterial biosensors.
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Affiliation(s)
- Tal Stern Bauer
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ravit Yakobi
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Mattan Hurevich
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Shlomo Yitzchaik
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Zvi Hayouka
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
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9
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Electrochemical Biosensor for the Determination of Specific Antibodies against SARS-CoV-2 Spike Protein. Int J Mol Sci 2022; 24:ijms24010718. [PMID: 36614164 PMCID: PMC9821011 DOI: 10.3390/ijms24010718] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/17/2022] [Accepted: 12/21/2022] [Indexed: 01/03/2023] Open
Abstract
In this article, we report the development of an electrochemical biosensor for the determination of the SARS-CoV-2 spike protein (rS). A gold disc electrode was electrochemically modified to form the nanocrystalline gold structure on the surface. Then, it was further altered by a self-assembling monolayer based on a mixture of two alkane thiols: 11-mercaptoundecanoic acid (11-MUA) and 6-mercapto-1-hexanol (6-MCOH) (SAMmix). After activating carboxyl groups using a N-(3-dimethylaminopropyl)-N'-ethyl-carbodiimide hydrochloride and N-hydroxysuccinimide mixture, the rS protein was covalently immobilized on the top of the SAMmix. This electrode was used to design an electrochemical sensor suitable for determining antibodies against the SARS-CoV-2 rS protein (anti-rS). We assessed the association between the immobilized rS protein and the anti-rS antibody present in the blood serum of a SARS-CoV-2 infected person using three electrochemical methods: cyclic voltammetry, differential pulse voltammetry, and potential pulsed amperometry. The results demonstrated that differential pulse voltammetry and potential pulsed amperometry measurements displayed similar sensitivity. In contrast, the measurements performed by cyclic voltammetry suggest that this method is the most sensitive out of the three methods applied in this research.
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10
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Valencia Ramirez A, Bonneux G, Terfort A, Losada-Pérez P, Renner FU. Nanomechanical Stability of Laterally Heterogeneous Films of Corrosion Inhibitor Molecules Obtained by Microcontact Printing on Au Model Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15614-15621. [PMID: 36484233 DOI: 10.1021/acs.langmuir.2c02276] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Self-assembled monolayers of corrosion inhibitors of the mercaptobenzimidazole family, SH-BimH, SH-BimH-5NH2, and SH-BimH-5OMe, were formed on template-stripped ultraflat Au surfaces using microcontact printing, and subsequently analyzed using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and AFM-force spectroscopy (AFM-FS) using a quantitative imaging (QI) mode. Printing of all used inhibitor molecules resulted in clear patterns and in slightly more compact films compared to immersion. The stability of the monolayers is further probed by AFM-FS. Adhesion values of laterally heterogeneous inhibitor-modified surfaces compared to bare Au surfaces, nonpatterned areas, and fully covered surfaces are analyzed and discussed. Microcontact printing confers a superior nanomechanical stability to imidazole-modified films of the printed surface patches as compared to homogeneously covered surfaces by immersion into the inhibitor solution.
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Affiliation(s)
- Andrea Valencia Ramirez
- Institute for Materials Research, Hasselt University, Diepenbeek 3590, Belgium
- Division IMOMEC, IMEC vzw, Diepenbeek 3590, Belgium
| | - Gilles Bonneux
- Institute for Materials Research, Hasselt University, Diepenbeek 3590, Belgium
- Division IMOMEC, IMEC vzw, Diepenbeek 3590, Belgium
| | - Andreas Terfort
- Institute of Inorganic and Analytical Chemistry, Goethe-University, Frankfurt am Main 60438, Germany
| | - Patricia Losada-Pérez
- Experimental Soft Matter and Thermal Physics Laboratory, Université Libre de Bruxelles (ULB), Brussels 1050, Belgium
| | - Frank Uwe Renner
- Institute for Materials Research, Hasselt University, Diepenbeek 3590, Belgium
- Division IMOMEC, IMEC vzw, Diepenbeek 3590, Belgium
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11
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Scaini D, Biscarini F, Casalis L, Albonetti C. Substrate roughness influence on the order of nanografted Self-Assembled Monolayers. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Pensa E, Azofra LM, Salvarezza RC, Carro P. Effect of Ligands on the Stability of Gold Nanoclusters. J Phys Chem Lett 2022; 13:6475-6480. [PMID: 35816759 DOI: 10.1021/acs.jpclett.2c01616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Gold nanoclusters (AuNCs) are atomic architectures that can be precisely tailored for catalytic applications. In this work, we studied two benchmark AuNCs, Au25(SR)18 and Au144(SR)60, covered by aromatic and aliphatic ligands to envision how the 3D structure of the ligand impacts the stability of the nanomaterial. Surprisingly, we found that increasing the alkanethiol length has a poor or null effect on the stability of the AuNCs, a trend opposite to that on Au(111) surfaces. When considering the aromatic or aliphatic nature, the AuNC stability follows the same trend as on Au(111): the thermodynamical stability is dictated by the ligand density rather than its chemical nature, where the aliphatic ligand imparts more stability than the aromatic one. Our findings provide a tool to predict how an ultrasmall gold core can interact with the environment, substrate, and themselves according to the stability of its protecting ligand shell.
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Affiliation(s)
- Evangelina Pensa
- Fakultät für Physik, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
| | - Luis Miguel Azofra
- Instituto de Estudios Ambientales y Recursos Naturales (i-UNAT), Universidad de Las Palmas de Gran Canaria (ULPGC), Campus de Tafira, 35017 Las Palmas de Gran Canaria, Spain
| | - Roberto C Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, La Plata 1900, Argentina
| | - Pilar Carro
- Área de Química Física, Departamento de Química, Facultad de Ciencias, Universidad de La Laguna, Instituto de Materiales y Nanotecnología, 38200 La Laguna, Spain
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13
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Green JB, Clarke E, McDermott C, McDermott M, Zhong C, Bergren A, Poter M. On the Counter‐Intuitive Heterogeneous Electron Transfer Barrier Properties of Alkanethiolate Monolayers on Gold: Smooth versus Rough Surfaces. ELECTROANAL 2022. [DOI: 10.1002/elan.202100704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Zhang X, Ding H, Chen X, Lin H, Li Q, Gao J, Pan M, Guo Q. Complex supramolecular tessellations with on-surface self-synthesized C 60 tiles through van der Waals interaction. NANOSCALE 2022; 14:1333-1339. [PMID: 35014655 DOI: 10.1039/d1nr05589e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Supramolecular tessellation with self-synthesized (C60)7 tiles is achieved based on a cooperative interaction between co-adsorbed C60 and octanethiol (OT) molecules. Tile synthesis and tiling take place simultaneously on a gold substrate leading to a two-dimensional lattice of (C60)7 tiles with OT as the binder molecule filling the gaps between the tiles. This supramolecular tessellation is featured with simultaneous on-site synthesis of tiles and self-organized tiling. In the absence of specific functional groups, the key to ordered tiling for the C60/OT system is the collective van der Waals (vdW) interaction among a large number of molecules. This bicomponent system herein offers a way for the artificial synthesis of 2D complex vdW supramolecular tessellations.
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Affiliation(s)
- Xin Zhang
- School of Physics, Northwest University, 710069, China
| | - Haoxuan Ding
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.
| | - Xiaorui Chen
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
| | - Haiping Lin
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
| | - Qing Li
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
| | - Jianzhi Gao
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
| | - Minghu Pan
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
| | - Quanmin Guo
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.
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15
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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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16
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Amadi EV, Venkataraman A, Papadopoulos C. Nanoscale self-assembly: concepts, applications and challenges. NANOTECHNOLOGY 2022; 33. [PMID: 34874297 DOI: 10.1088/1361-6528/ac3f54] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 12/02/2021] [Indexed: 05/09/2023]
Abstract
Self-assembly offers unique possibilities for fabricating nanostructures, with different morphologies and properties, typically from vapour or liquid phase precursors. Molecular units, nanoparticles, biological molecules and other discrete elements can spontaneously organise or form via interactions at the nanoscale. Currently, nanoscale self-assembly finds applications in a wide variety of areas including carbon nanomaterials and semiconductor nanowires, semiconductor heterojunctions and superlattices, the deposition of quantum dots, drug delivery, such as mRNA-based vaccines, and modern integrated circuits and nanoelectronics, to name a few. Recent advancements in drug delivery, silicon nanoelectronics, lasers and nanotechnology in general, owing to nanoscale self-assembly, coupled with its versatility, simplicity and scalability, have highlighted its importance and potential for fabricating more complex nanostructures with advanced functionalities in the future. This review aims to provide readers with concise information about the basic concepts of nanoscale self-assembly, its applications to date, and future outlook. First, an overview of various self-assembly techniques such as vapour deposition, colloidal growth, molecular self-assembly and directed self-assembly/hybrid approaches are discussed. Applications in diverse fields involving specific examples of nanoscale self-assembly then highlight the state of the art and finally, the future outlook for nanoscale self-assembly and potential for more complex nanomaterial assemblies in the future as technological functionality increases.
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Affiliation(s)
- Eberechukwu Victoria Amadi
- University of Victoria, Department of Electrical and Computer Engineering, PO BOX 1700 STN CSC, Victoria, BC, V8W 2Y2, Canada
| | - Anusha Venkataraman
- University of Victoria, Department of Electrical and Computer Engineering, PO BOX 1700 STN CSC, Victoria, BC, V8W 2Y2, Canada
| | - Chris Papadopoulos
- University of Victoria, Department of Electrical and Computer Engineering, PO BOX 1700 STN CSC, Victoria, BC, V8W 2Y2, Canada
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17
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Carlson S, Becker M, Brünig FN, Ataka K, Cruz R, Yu L, Tang P, Kanduč M, Haag R, Heberle J, Makki H, Netz RR. Hydrophobicity of Self-Assembled Monolayers of Alkanes: Fluorination, Density, Roughness, and Lennard-Jones Cutoffs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13846-13858. [PMID: 34787431 DOI: 10.1021/acs.langmuir.1c02187] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The interplay of fluorination and structure of alkane self-assembled monolayers and how these affect hydrophobicity are explored via molecular dynamics simulations, contact angle goniometry, and surface-enhanced infrared absorption spectroscopy. Wetting coefficients are found to grow linearly in the monolayer density for both alkane and perfluoroalkane monolayers. The larger contact angles of monolayers of perfluorinated alkanes are shown to be primarily caused by their larger molecular volume, which leads to a larger nearest-neighbor grafting distance and smaller tilt angle. Increasing the Lennard-Jones force cutoff in simulations is found to increase hydrophilicity. Specifically, wetting coefficients scale like the inverse square of the cutoff, and when extrapolated to the infinite cutoff limit, they yield contact angles that compare favorably to experimental values. Nanoscale roughness is also found to reliably increase monolayer hydrophobicity, mostly via the reduction of the entropic part of the work of adhesion. Analysis of depletion lengths shows that droplets on nanorough surfaces partially penetrate the surface, intermediate between Wenzel and Cassie-Baxter states.
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Affiliation(s)
- Shane Carlson
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Maximilian Becker
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Florian N Brünig
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Kenichi Ataka
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Rubén Cruz
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Leixiao Yu
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Peng Tang
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Matej Kanduč
- Department of Theoretical Physics, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Rainer Haag
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Joachim Heberle
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Hesam Makki
- Polymer and Color Engineering, Amirkabir University of Technology, 424 Hafez Ave, Tehran 15875-4413, Iran
| | - Roland R Netz
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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18
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Hechenberger F, Kollotzek S, Ballauf L, Duensing F, Ončák M, Herman Z, Scheier P. Formation of HCN + in collisions of N + and N 2+ with a self-assembled propanethiol surface on gold. Phys Chem Chem Phys 2021; 23:7777-7782. [PMID: 33015698 DOI: 10.1039/d0cp04164e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Collisions of N+ and N2+ with C3 hydrocarbons, represented by a self assembled monolayer of propanethiol on a polcrystalline gold surface, were investigated by experiments over the incident energy range between 5 eV and 100 eV. For N+, formation of HCN+ is observed at incident energies of projectile ions as low as 20 eV. In the case of N2+ projectile ions, the yield of HCN+ increased above zero only at incident energies of about 50 eV. This collision energy in the laboratory frame corresponds to an activation energy of about 3 eV to 3.5 eV. In the case of N+ projectile ions, the yield of HCN+ was large for most of the incident energy range, but decreased to zero at incident energies below 20 eV. This may indicate a very small energy threshold for the surface reaction between N+ and C3 hydrocarbons of a few tenths of an eV. Such a threshold for the formation of HCN+ may exist also for collisions of N+ with an adsorbed mixture of hydrocarbon molecules.
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Affiliation(s)
- Faro Hechenberger
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerst. 25, A-6020 Innsbruck, Austria.
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19
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Stratis G, Zesch JD, Pan HS, Webb LJ, Raizen MG. Monitoring damage of self-assembled monolayers using metastable excited helium atoms. J Chem Phys 2021; 154:034704. [PMID: 33499631 DOI: 10.1063/5.0036827] [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
The breaking of molecular bonds during exposure to ionizing radiation and electron beams creates irreversible damage in the molecular structure. In some cases, such as lithography, controlled damage of a molecular resist is a desirable process and is the basis for the entire semiconductor industry. In other cases, such as environmental exposure or probing of the molecular structure, the induced damage is a major problem that has limited advances in science and technology. We report here the use of an in situ probe that is minimally invasive to detect real-time damage induced in organic materials. Specifically, we use metastable excited helium atoms in the 3S1 state to characterize the damage caused by a low-energy electron beam ∼30 eV on an organic self-assembled monolayer of 11-bromo-1-undecanethiol on a gold substrate. We were able to monitor the damage caused by the electron beam without introducing any additional observed damage by the probing metastable atoms.
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Affiliation(s)
- Georgios Stratis
- Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
| | - Jordan D Zesch
- Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
| | - Henry S Pan
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - Lauren J Webb
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA
| | - Mark G Raizen
- Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
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20
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21
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Skountzos EN, Wrochem F, Mavrantzas VG. Structure and Conformation of a Crystalline P3HT Film Adsorbed on an Alkanethiol Self‐Assembled Monolayer Deposited on Gold. MACROMOL THEOR SIMUL 2020. [DOI: 10.1002/mats.202000010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Emmanuel N. Skountzos
- Department of Chemical EngineeringUniversity of Patras & FORTH‐ICE/HT Patras GR 26504 Greece
| | - Florian Wrochem
- Institute of Materials ScienceUniversity of Stuttgart Heisenbergstr. 3 Stuttgart 70569 Germany
| | - Vlasis G. Mavrantzas
- Department of Chemical EngineeringUniversity of Patras & FORTH‐ICE/HT Patras GR 26504 Greece
- Department of Mechanical and Process EngineeringParticle Technology LaboratoryETH Zürich Sonneggstrasse 3, ML F 14.2 Zürich CH‐8092 Switzerland
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22
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Ghosh M, Yang DS. Structures of self-assembled n-alkanethiols on gold by reflection high-energy electron diffraction. Phys Chem Chem Phys 2020; 22:17325-17335. [DOI: 10.1039/d0cp02866e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structures of long-chain alkanethiols (C18H37SH) chemisorbed on an Au(111) single crystal were investigated using reflection high-energy electron diffraction (RHEED).
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Affiliation(s)
- Mithun Ghosh
- Department of Chemistry
- University of Houston
- Houston
- USA
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23
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Formation of long-range-ordered self-assembled monolayers of dodecyl thiocyanates on Au(111) via ambient-pressure vapor deposition. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123969] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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25
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Roy JK, Vasquez ES, Pinto HP, Kumari S, Walters KB, Leszczynski J. Computational and experimental approach to understanding the structural interplay of self-assembled end-terminated alkanethiolates on gold surfaces. Phys Chem Chem Phys 2019; 21:23320-23328. [DOI: 10.1039/c9cp03613j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Molecular organization dictates phases, stability and subsequent electronic structure of self-assembled monolayers. With appropriate density functionals, ab initio molecular dynamics (AIMD) simulations predicted and elucidated experimental orientations.
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Affiliation(s)
- Juganta K. Roy
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Physics and Atmospheric Sciences
- Jackson State University
- Jackson
| | - Erick S. Vasquez
- Department of Chemical and Materials Engineering
- University of Dayton
- Dayton
- USA
| | - Henry P. Pinto
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Physics and Atmospheric Sciences
- Jackson State University
- Jackson
| | - Swati Kumari
- Swalm School of Chemical Engineering
- Mississippi State University
- Mississippi 39762
- USA
| | - Keisha B. Walters
- School of Chemical
- Biological and Materials Engineering
- The University of Oklahoma
- Norman
- USA
| | - Jerzy Leszczynski
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Physics and Atmospheric Sciences
- Jackson State University
- Jackson
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26
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Fujita A, Kobayashi K, Yamada H. Investigation of Local Hydration Structures of Alkanethiol Self-Assembled Monolayers with Different Molecular Structures by FM-AFM. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15189-15194. [PMID: 30431278 DOI: 10.1021/acs.langmuir.8b03052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hydration structures play crucial roles in a wide variety of chemical and biological phenomena. However, the key factors that determine a hydration structure remain an open question. Most recent studies have focused on the electrostatic interactions between the surface charges and dipoles of water molecules, which are determined by the atomic/ionic species of the outermost solid surface, as the dominating factor. The number of studies on the correlation between the hydration structure and the atomic-scale surface corrugation has been limited. In this study, we investigated the hydration structures of alkanethiol self-assembled monolayers terminated with a hydroxyl group using frequency-modulated atomic force microscopy. We observed two molecular structures, namely, the (√3 × √3) R30° structure and the c(4 × 2) superlattice structure, and found that their hydration structures are different mainly because of the slight differences in their molecular arrangements. This result suggests that a slight difference in the molecular/atomic arrangements as well as the atomic/ionic species in the outermost solid surface strongly influences the local hydration structures.
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Affiliation(s)
- Akito Fujita
- Department of Electronic Science and Engineering , Kyoto University , Kyoto 615-8510 , Japan
| | - Kei Kobayashi
- Department of Electronic Science and Engineering , Kyoto University , Kyoto 615-8510 , Japan
| | - Hirofumi Yamada
- Department of Electronic Science and Engineering , Kyoto University , Kyoto 615-8510 , Japan
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27
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Casadiegos S, Bustos RH, Fontanilla MR. Comparative evaluation of healing biomarkers in skin wound exudates using a nanobiosensor and histological analysis of full-thickness skin wounds grafted with multidirectional or unidirectional artificial dermis. J Tissue Eng Regen Med 2018; 12:2299-2308. [PMID: 30350342 DOI: 10.1002/term.2762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 09/02/2018] [Accepted: 10/18/2018] [Indexed: 11/11/2022]
Abstract
Analysis of factors that play a role on the healing process in exudates from skin wounds might shed light on the effect that grafted artificial tissue has in wound regeneration and repair. The first objective of this work was to standardize an optic surface plasmon resonance method based on self-assembled monolayers to quantify healing mediator factors (angiopoietin-2, epidermal growth factor, tumour necrosis factor-α, transforming growth factor-β1, and vascular endothelial growth factor) in wound exudates. Optimal conditions for self-assembling of alkanethiol monolayers, immobilization of antibodies antifactors, and regeneration of sensor surfaces were established. A second objective was to compare healing of wounds grafted with artificial dermis with wounds left to heal by secondary intention (control) in a lagomorph model of full-thickness skin wound. Each animal included in this study had a control wound and an identical contralateral wound grafted with artificial dermis that was made by seeding autologous skin fibroblasts into unidirectional or multidirectional collagen type I scaffolds. Histological and histomorphometric analyses were carried out when animals were sacrificed, in addition to quantifying the factors in the exudates of wounds sampled 3 days after surgery. There were significant differences between the concentrations of evaluated factors in the exudates from grafted and control wounds. This finding coincides with differences observed in the histological and histomorphometric analyses of repaired tissue formed in treated and control wounds.
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Affiliation(s)
- Sergio Casadiegos
- Tissue Engineering Group, Department of Pharmacy, National University of Colombia, Bogotá, Colombia
| | - Rosa Helena Bustos
- Tissue Engineering Group, Department of Pharmacy, National University of Colombia, Bogotá, Colombia
| | - Marta R Fontanilla
- Tissue Engineering Group, Department of Pharmacy, National University of Colombia, Bogotá, Colombia
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28
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Insights into the self-assembly of aromatic dinitroso derivatives on gold surface. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.05.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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Marzec MM, Awsiuk K, Daąbczyński P, Rysz J, Budkowski A, Bernasik A. Influence of Acrylic Polymers Stereoregularity on Interface Interactions in Model Thin Film Systems. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mateusz M. Marzec
- Academic Centre for Materials and Nanotechnology; AGH University of Science and Technology; al. Mickiewicza 30 30-059 Krakow Poland
| | - Kamil Awsiuk
- Smoluchowski Institute of Physics; Jagiellonian University; ul. Łojasiewicza 11 30-348 Kraków Poland
| | - Paweł Daąbczyński
- Smoluchowski Institute of Physics; Jagiellonian University; ul. Łojasiewicza 11 30-348 Kraków Poland
| | - Jakub Rysz
- Smoluchowski Institute of Physics; Jagiellonian University; ul. Łojasiewicza 11 30-348 Kraków Poland
| | - Andrzej Budkowski
- Smoluchowski Institute of Physics; Jagiellonian University; ul. Łojasiewicza 11 30-348 Kraków Poland
| | - Andrzej Bernasik
- Academic Centre for Materials and Nanotechnology; AGH University of Science and Technology; al. Mickiewicza 30 30-059 Krakow Poland
- Faculty of Physics and Applied Computer Science; AGH University of Science and Technology; al. Mickiewicza 30 30-059 Kraków Poland
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30
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Holmes S, Gao J, Tang L, Li F, Palmer RE, Guo Q. Bridge-bonded methylthiolate on Au(111) observed with the scanning tunneling microscope. Phys Chem Chem Phys 2018; 20:19486-19491. [PMID: 29998269 DOI: 10.1039/c8cp03684e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We report the discovery of bridge-bonded methylthiolate, SCH3, along the step edges of the Au(111) surface. Real-space imaging with a scanning tunnelling microscope reveals the presence of bridge-bonded SCH3 along both the [11[combining macron]0] and the [112[combining macron]] oriented step edges. The nearest neighbour distances of SCH3 along these steps are 2a and , respectively. The Au(111) terrace is covered with the usual CH3SAuSCH3 staples. The bridge-bonded alkanethiolate is expected to play a rather significant role in the formation of thiol-passivated Au nanoclusters because of the high fraction of atoms in similar low-coordination sites.
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Affiliation(s)
- Scott Holmes
- School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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31
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Gao J, Lin H, Qin X, Zhang X, Ding H, Wang Y, Rokni Fard M, Kaya D, Zhu G, Li Q, Li Y, Pan M, Guo Q. Probing Phase Evolutions of Au-Methyl-Propyl-Thiolate Self-Assembled Monolayers on Au(111) at the Molecular Level. J Phys Chem B 2018; 122:6666-6672. [PMID: 29878779 DOI: 10.1021/acs.jpcb.8b03390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A self-assembled monolayer (SAM) consisting of a mixture of CH3S-Au-SCH3, CH3S-Au-S(CH2)2CH3, and CH3(CH2)2S-Au-S(CH2)2CH3 was studied systematically using scanning tunneling microscopy and density functional calculations. We find that the SAM is subjected to frequent changes at the molecular level on the time scale of ∼minutes. The presence of CH3S or CH3S-Au as a dissociation product of CH3S-Au-SCH3 plays a key role in the dynamical behavior of the mixed SAM. Slow phase separation takes place at room temperature over hours to days, leading to the formation of methyl-thiolate-rich and propyl-thiolate-rich phases. Our results provide new insights into the chemistry of the thiolate-Au interface, especially for ligand exchange reaction in the RS-Au-SR staple motif.
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Affiliation(s)
- Jianzhi Gao
- School of Physics and Information Technology , Shaanxi Normal University , Xi'an 710119 , China
| | - Haiping Lin
- Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren-Ai Road , Suzhou , Jiangsu Province 215123 , China
| | - Xuhui Qin
- School of Physics and Information Technology , Shaanxi Normal University , Xi'an 710119 , China
| | - Xin Zhang
- School of Physics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Haoxuan Ding
- School of Physics and Astronomy , University of Birmingham , Birmingham B15 2TT , United Kingdom
| | - Yitao Wang
- School of Physics and Information Technology , Shaanxi Normal University , Xi'an 710119 , China
| | - Mahroo Rokni Fard
- School of Physics and Astronomy , University of Birmingham , Birmingham B15 2TT , United Kingdom
| | - Dogan Kaya
- School of Physics and Astronomy , University of Birmingham , Birmingham B15 2TT , United Kingdom
| | - Gangqiang Zhu
- School of Physics and Information Technology , Shaanxi Normal University , Xi'an 710119 , China
| | - Qing Li
- Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren-Ai Road , Suzhou , Jiangsu Province 215123 , China
| | - Youyong Li
- Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren-Ai Road , Suzhou , Jiangsu Province 215123 , China
| | - Minghu Pan
- School of Physics , Huazhong University of Science and Technology , Wuhan 430074 , China
| | - Quanmin Guo
- School of Physics and Astronomy , University of Birmingham , Birmingham B15 2TT , United Kingdom
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32
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Neupane S, Losada-Pérez P, Vivegnis S, Mekhalif Z, Delhalle J, Bashir A, Renner FU. Two-Step Nanoscale Approach for Well-Defined Complex Alkanethiol Films on Au Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:66-72. [PMID: 29221371 DOI: 10.1021/acs.langmuir.7b02760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Controlling the molecular organization of organic self-assembled monolayers (SAM) is of utmost importance in nanotechnology, molecular electronics, and surface science. Here we propose two well-differentiated approaches, double printing based on microcontact printing (μ-cp) and molecular backfilling adsorption, to produce complex alkanethiol films. The resulting films on model Au surfaces were characterized by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and contact angle measurements. Double printing alkanethiols results in clear coexisting regions where no molecular displacement is observed, highlighting the slow diffusion rates of long alkanethiols and large attractive interaction between long alkyl chains. Exposing a single-print μ-cp Au substrate to an additional alkanethiol solution yields the formation of differently ordered domain boundaries with different thickness and micrometer lateral size. The high order is a result of enhanced molecular mobility and restructuring during solution backfilling. The formed molecular assemblies constitute an excellent testing ground for nanoscale phenomena that strongly depend on the nanoscale geometrical and chemical features of the surface such as designed functionality or corrosion initiation and inhibition.
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Affiliation(s)
- S Neupane
- Institute for Materials Research (IMO), Hasselt University , 3590 Diepenbeek, Belgium
- IMEC vzw. Division IMOMEC, 3590 Diepenbeek, Belgium
| | - P Losada-Pérez
- Institute for Materials Research (IMO), Hasselt University , 3590 Diepenbeek, Belgium
- IMEC vzw. Division IMOMEC, 3590 Diepenbeek, Belgium
| | - S Vivegnis
- Institute for Materials Research (IMO), Hasselt University , 3590 Diepenbeek, Belgium
- Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur , 61, rue de Bruxelles, B-5000 Namur, Belgium
| | - Z Mekhalif
- Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur , 61, rue de Bruxelles, B-5000 Namur, Belgium
| | - J Delhalle
- Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur , 61, rue de Bruxelles, B-5000 Namur, Belgium
| | - A Bashir
- Thyssenkrupp Bilstein GmbH, Niederkell 25, 54429 Mandern, Germany
| | - F U Renner
- Institute for Materials Research (IMO), Hasselt University , 3590 Diepenbeek, Belgium
- IMEC vzw. Division IMOMEC, 3590 Diepenbeek, Belgium
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33
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Pensa E, Albrecht T. Controlling the Dynamic Instability of Capped Metal Nanoparticles on Metallic Surfaces. J Phys Chem Lett 2018; 9:57-62. [PMID: 29232520 DOI: 10.1021/acs.jpclett.7b02994] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Small metal nanoparticles (NPs) with core-sizes ranging from 1 to 3 nm constitute a bridge between molecules and colloids with unique electronic, catalytic, and other properties. Many applications entail immobilization onto solid supports, but while NP behavior in solution is well studied, the effect of the interaction between NPs and the substrate surface is understood less. Here, we follow the structural evolution of thiolated monolayer-protected AuNPs on Au(111) substrates at the single-particle level in real-time using high-resolution in situ scanning tunneling microscopy. We show how the reactivity of the substrate affects the stability of the immobilized NPs and how their structural identity can be preserved. Entropically driven redistribution of the NP's protective capping layer is an important element in the disintegration process and at the same time rather generic. Our findings may thus have wider implications on the design and optimization of functional surfaces involving NPs, made of materials other than Au.
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Affiliation(s)
- Evangelina Pensa
- Department of Chemistry, Imperial College London , Exhibition Road, London SW7 2AZ, United Kingdom
| | - Tim Albrecht
- Department of Chemistry, Imperial College London , Exhibition Road, London SW7 2AZ, United Kingdom
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34
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Chen J, Wang Z, Oyola-Reynoso S, Thuo MM. Properties of Self-Assembled Monolayers Revealed via Inverse Tensiometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13451-13467. [PMID: 28777587 DOI: 10.1021/acs.langmuir.7b01937] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Self-assembled monolayers (SAMs) have emerged as a simple platform technology and hence have been broadly studied. With advances in state-of-the-art fabrication and characterization methods, new insights into SAM structure and related properties have been delineated, albeit with some discrepancies and/or incoherencies. Some discrepancies, especially between experimental and theoretical work, are in part due to the misunderstanding of subtle structural features such as phase evolution and SAM quality. Recent work has, however, shown that simple techniques, such as the measurement of static contact angles, can be used to delineate otherwise complex properties of the SAM, especially when complemented by other more advanced techniques. In this article, we highlight the effect of nanoscale substrate asperities and molecular chain length on the SAM structure and associated properties. First, surfaces with tunable roughness are prepared on both Au and Ag, and their corresponding n-alkanethiolate SAMs are characterized through wetting and spectroscopy. From these data, chain-length- and substrate-morphology-dependent limits to the odd-even effect (structure and properties vary with the number of carbons in the molecules and the nature of the substrate), parametrization of gauche defect densities, and structural phase evolution (liquidlike, waxy, crystalline interfaces) are deduced. An evaluation of the correlation between the effect of roughness and the components of surface tension (polar-γp and dispersive-γd) reveals that wetting, at nanoscale rough surfaces, evolves proportionally with the ratio of the two components of surface tension. The evolution of conformational order is captured over a range of molecular lengths and parametrized through a dimensionless number, χc. By deploying a well-known tensiometry technique (herein the liquid is used to characterize the solid, hence the term inverse tensiometry) to characterize SAMs, we demonstrate that complex molecular-level phenomena in SAMs can be understood through simplicity.
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Affiliation(s)
- Jiahao Chen
- Department of Materials Science and Engineering, Iowa State University , 2220 Hoover Hall, Ames, Iowa 50011, United States
| | - Zhengjia Wang
- Department of Materials Science and Engineering, Iowa State University , 2220 Hoover Hall, Ames, Iowa 50011, United States
| | - Stephanie Oyola-Reynoso
- Department of Materials Science and Engineering, Iowa State University , 2220 Hoover Hall, Ames, Iowa 50011, United States
| | - Martin M Thuo
- Department of Materials Science and Engineering, Iowa State University , 2220 Hoover Hall, Ames, Iowa 50011, United States
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35
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Asakawa H, Inada N, Hirata K, Matsui S, Igarashi T, Oku N, Yoshikawa N, Fukuma T. Self-assembled monolayers of sulfonate-terminated alkanethiols investigated by frequency modulation atomic force microscopy in liquid. NANOTECHNOLOGY 2017; 28:455603. [PMID: 28876225 DOI: 10.1088/1361-6528/aa8aa7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A molecular-scale understanding of self-assembled monolayers (SAMs) of sulfonate-terminated alkanethiols is crucial for interfacial studies of functionalized SAMs and their various applications. However, such an understanding has been difficult to achieve because of the lack of direct information on these molecular-scale structures in real space. In this study, we investigated the structures of sulfonate SAMs of sodium 11-mercapto-1-undecanesulfonate (MUS) by frequency modulation atomic force microscopy (FM-AFM) in liquid. The subnanometer-resolution FM-AFM images showed that the single-component MUS SAM prepared in pure water had random surface structures. In contrast, the MUS SAM prepared in a water-ethanol mixed solvent showed periodic striped structures with a flat-lying conformation. The results suggest a significant solvent effect on molecular-scale structures of long-chain sulfonate SAMs. In addition, we investigated the molecular-scale structures of mixed SAMs of MUS and 11-mercapto-1-undecanol (MUO) with alkane chains of the same length. The FM-AFM images of the mixed SAMs showed clear phase separation between MUS SAM and MUO SAM domains. In the MUO SAM domains, the incorporated MUS molecules appeared as protrusions. The results obtained in this study provide direct structural information on long-chain sulfonate and mixed SAMs.
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Affiliation(s)
- Hitoshi Asakawa
- Division of Material Chemistry, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. Bio-AFM Frontier Research Center, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. PRESTO, JST, Kawaguchi, 332-0012, Japan
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36
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Chen J, Chang B, Oyola-Reynoso S, Wang Z, Thuo M. Quantifying Gauche Defects and Phase Evolution in Self-Assembled Monolayers through Sessile Drops. ACS OMEGA 2017; 2:2072-2084. [PMID: 31457561 PMCID: PMC6640986 DOI: 10.1021/acsomega.7b00355] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 05/04/2017] [Indexed: 05/31/2023]
Abstract
Self-assembled monolayers (SAMs) are widely used in surface modifications, specifically in tuning the surface chemistry of materials. The structure and properties of SAMs have been extensively studied often with sophisticated tools, even for the simplest n-alkanethiolate SAMs. In SAMs, especially in linear n-alkanethiolates, the properties are dependent on the chain length, which is best manifested in the so-called odd-even effect, a simple yet not fully understood phenomenon. One main challenge is fully delineating the origin of length-dependent properties, which can be due to the structure (ideal SAMs), defect evolution, or substrate-molecule effects. This study demonstrates that utilizing the wetting behavior of polar (water) and nonpolar (hexadecane (HD)) solvents on n-alkanethiolate SAMs formed on ultraflat gold and silver surfaces, the evolution of chain-length-dependent gauche defects can be revealed and parameterized through a newly defined dimensionless number (χ). The observation of the odd-even effect in hydrophobicity, however, depends on the thiol chain length, and it was only observed on longer-chain (>C8) molecules. The trend in this odd-even effect demonstrates that there are three main transitions in the nature of wetting, hence structure, across n-alkanethiols. From wetting with HD, the role of dispersive components in wetting reveal that the SAMs are dynamic, which we attribute to rotations associated with previously reported evolution in gauche defects and changes in packing density. Therefore, from re-expression of the Young-Dupre equation, we define a new dimensionless number associated with molecular conformations, whose periodicity mirrors the energetics of Goodman's conformations of n-alkanes in unbound states and associated four- or two-twist turns. Therefore, we infer that the evolution in surface energy is largely due to molecular conformations and associated relaxations of the bound thiolates.
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Affiliation(s)
- Jiahao Chen
- Department
of Materials Science and Engineering, Iowa
State University, 2220 Hoover Hall, Ames, Iowa 50011, United
States
- Division
of Materials Science and Engineering, Ames
Laboratory, Ames, Iowa 50011, United
States
- Micro-Electronic
Research Center, Iowa State University, 133 Applied Sciences Complex I,
1925 Scholl Road, Ames, Iowa 50011, United States
| | - Boyce Chang
- Department
of Materials Science and Engineering, Iowa
State University, 2220 Hoover Hall, Ames, Iowa 50011, United
States
- Division
of Materials Science and Engineering, Ames
Laboratory, Ames, Iowa 50011, United
States
| | - Stephanie Oyola-Reynoso
- Department
of Materials Science and Engineering, Iowa
State University, 2220 Hoover Hall, Ames, Iowa 50011, United
States
| | - Zhengjia Wang
- Department
of Materials Science and Engineering, Iowa
State University, 2220 Hoover Hall, Ames, Iowa 50011, United
States
| | - Martin Thuo
- Department
of Materials Science and Engineering, Iowa
State University, 2220 Hoover Hall, Ames, Iowa 50011, United
States
- Micro-Electronic
Research Center, Iowa State University, 133 Applied Sciences Complex I,
1925 Scholl Road, Ames, Iowa 50011, United States
- Biopolymer
and Biocomposites Research Team, Center for Bioplastics and Biocomposites, Iowa State University, 1041 Food Sciences Building, Ames, Iowa 50011, United States
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37
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Arrotin B, Delhalle J, Dubois P, Mespouille L, Mekhalif Z. Electroassisted Functionalization of Nitinol Surface, a Powerful Strategy for Polymer Coating through Controlled Radical Surface Initiation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2977-2985. [PMID: 28252303 DOI: 10.1021/acs.langmuir.6b04536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Coating Nitinol (NiTi) surfaces with a polymer layer has become very appealing in the past few years owing to its increased attraction in the biomedical field. Although its intrinsic properties helped ensure its popularity, its extensive implementation is still hampered by its nickel inclusion, making it sensitive to pitting corrosion and therefore leading to the release of carcinogenic Ni2+ ions. Among all recent ways to modify NiTi surfaces, elaboration of self-assembled monolayers is of great interest as their high order confers a reinforcement of the metal surface corrosion resistance and brings new functionalities to the metal for postmodification processes. In this work, we compare the electroassisted and thermally assisted self-assembling of 11-(2-bromoisobutyrate)-undecyl-1-phosphonic acid (BUPA) to the classical immersion process on NiTi surfaces initially submitted to a hydrothermal treatment. Among all tested conditions, the electroassisted grafting of BUPA at room temperature appears to be the most promising alternative, as it allows grafting in very short times (5-10 min), thus preventing its degradation. The thus-formed layer has been proven to be sufficient to enable the surface-initiated atom transfer radical polymerization (SI-ATRP) of 2-(dimethylamino)ethyl methacrylate.
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Affiliation(s)
- Bastien Arrotin
- Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur , rue de Bruxelles, 61, B-5000 Namur, Belgium
- Laboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials & Polymers (CIRMAP), Health and Materials Research Institutes, University of Mons , Place du Parc, 23, B-7000 Mons, Belgium
| | - Joseph Delhalle
- Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur , rue de Bruxelles, 61, B-5000 Namur, Belgium
| | - Philippe Dubois
- Laboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials & Polymers (CIRMAP), Health and Materials Research Institutes, University of Mons , Place du Parc, 23, B-7000 Mons, Belgium
- Materials Research and Technology Department (MRT), Luxembourg Institute of Science and Technology (LIST) , Rue du Brill, 41, 4422 Belvaux, Luxembourg
| | - Laetitia Mespouille
- Laboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials & Polymers (CIRMAP), Health and Materials Research Institutes, University of Mons , Place du Parc, 23, B-7000 Mons, Belgium
| | - Zineb Mekhalif
- Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur , rue de Bruxelles, 61, B-5000 Namur, Belgium
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Bouju X, Mattioli C, Franc G, Pujol A, Gourdon A. Bicomponent Supramolecular Architectures at the Vacuum–Solid Interface. Chem Rev 2017; 117:1407-1444. [DOI: 10.1021/acs.chemrev.6b00389] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Xavier Bouju
- CEMES-CNRS, 29 Rue J. Marvig, 31055 Toulouse, France
| | | | - Grégory Franc
- CEMES-CNRS, 29 Rue J. Marvig, 31055 Toulouse, France
| | - Adeline Pujol
- Université de Toulouse, UPS, CNRS, CEMES, 118 route de Narbonne, 31062 Toulouse, France
| | - André Gourdon
- CEMES-CNRS, 29 Rue J. Marvig, 31055 Toulouse, France
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39
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Lee I, Son S, Shin T, Hahn JR. Direct observation of the conformational transitions of single pyridine molecules on a Ag(110) surface induced by long-range repulsive intermolecular interactions. J Chem Phys 2017; 146:014706. [PMID: 28063439 DOI: 10.1063/1.4973379] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The transition between two conformations of pyridine molecules adsorbed on a Ag(110) surface at 13 K was investigated by performing single-molecule manipulation at a very low coverage and the track-imaging of pyridines for various surface coverages using a variable low-temperature scanning tunneling microscope. A single tilted conformer was converted to an upright conformer when another coadsorbed tilted pyridine molecule approached to within ∼2 nm. The conversion probability depends on the molecular separation. The tilted conformers that are prevalent at a very low coverage were converted to upright conformers with an increasing surface coverage. The minimum molecular separation before this transition is induced was determined to be 2.2 nm using molecular track-imaging and statistical analysis of the pyridine separation as a function of the molecular coverage. The conformation transition was attributed to substrate-mediated long-range repulsive interactions between the pyridine molecules, which are produced by charge redistribution that occurs upon pyridine adsorption on the silver surface.
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Affiliation(s)
- Insup Lee
- Department of Chemistry and Bioactive Material Sciences and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju 561-756, South Korea
| | - Seungbae Son
- Jeonju Center, Korea Basic Science Institute, Jeonju 561-756, South Korea
| | - Taeho Shin
- Department of Chemistry and Bioactive Material Sciences and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju 561-756, South Korea
| | - Jae R Hahn
- Department of Chemistry and Bioactive Material Sciences and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju 561-756, South Korea
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Slaughter LS, Cheung KM, Kaappa S, Cao HH, Yang Q, Young TD, Serino AC, Malola S, Olson JM, Link S, Häkkinen H, Andrews AM, Weiss PS. Patterning of supported gold monolayers via chemical lift-off lithography. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:2648-2661. [PMID: 29259879 PMCID: PMC5727779 DOI: 10.3762/bjnano.8.265] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 11/24/2017] [Indexed: 05/19/2023]
Abstract
The supported monolayer of Au that accompanies alkanethiolate molecules removed by polymer stamps during chemical lift-off lithography is a scarcely studied hybrid material. We show that these Au-alkanethiolate layers on poly(dimethylsiloxane) (PDMS) are transparent, functional, hybrid interfaces that can be patterned over nanometer, micrometer, and millimeter length scales. Unlike other ultrathin Au films and nanoparticles, lifted-off Au-alkanethiolate thin films lack a measurable optical signature. We therefore devised fabrication, characterization, and simulation strategies by which to interrogate the nanoscale structure, chemical functionality, stoichiometry, and spectral signature of the supported Au-thiolate layers. The patterning of these layers laterally encodes their functionality, as demonstrated by a fluorescence-based approach that relies on dye-labeled complementary DNA hybridization. Supported thin Au films can be patterned via features on PDMS stamps (controlled contact), using patterned Au substrates prior to lift-off (e.g., selective wet etching), or by patterning alkanethiols on Au substrates to be reactive in selected regions but not others (controlled reactivity). In all cases, the regions containing Au-alkanethiolate layers have a sub-nanometer apparent height, which was found to be consistent with molecular dynamics simulations that predicted the removal of no more than 1.5 Au atoms per thiol, thus presenting a monolayer-like structure.
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Affiliation(s)
- Liane S Slaughter
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Kevin M Cheung
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Sami Kaappa
- Department of Physics, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland
| | - Huan H Cao
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Qing Yang
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Thomas D Young
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Andrew C Serino
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Sami Malola
- Department of Physics, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland
| | - Jana M Olson
- Department of Chemistry, Rice University, Houston, Texas, 77005, USA
| | - Stephan Link
- Department of Chemistry, Rice University, Houston, Texas, 77005, USA
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas, 77005, USA
| | - Hannu Häkkinen
- Department of Physics, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland
- Department of Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland
| | - Anne M Andrews
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, and Hatos Center for Neuropharmacology, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Paul S Weiss
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA
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41
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Mete E, Yortanlı M, Danışman MF. A van der Waals DFT study of chain length dependence of alkanethiol adsorption on Au(111): physisorption vs. chemisorption. Phys Chem Chem Phys 2017; 19:13756-13766. [DOI: 10.1039/c7cp01653k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Coverage and size dependent chain–chain electronic interactions counteract with the alkyl chain–gold surface interactions and the surface relaxation of the metal in the formation of standing up monolayer structures.
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Affiliation(s)
- Ersen Mete
- Department of Physics
- Balıkesir University
- Balıkesir 10145
- Turkey
| | - Merve Yortanlı
- Department of Physics
- Balıkesir University
- Balıkesir 10145
- Turkey
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42
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Gao J, Tang L, Holmes S, Li F, Palmer RE, Guo Q. Surface-induced symmetry reduction in molecular switching: asymmetric cis-trans switching of CH 3S-Au-SCH 3 on Au(111). NANOSCALE 2016; 8:19787-19793. [PMID: 27874122 DOI: 10.1039/c6nr06864b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The cis-trans isomerization of CH3S-Au-SCH3 driven by the tip of the scanning tunneling microscope is investigated at 77 K. CH3S-Au-SCH3 anchored on the Au(111) surface with the S-Au-S axis parallel to the substrate functions as a molecular switch due to the flipping of the CH3 groups. The bonding between CH3S-Au-SCH3 and Au(111) leads to asymmetric isomerization where one of the two methyl groups flips much more effectively than the other, despite the symmetry of CH3S-Au-SCH3. Our findings suggest the possibility of constructing similar molecular switches that can be operated at room temperature and a potential route for fine-tuning of molecular switches in future nanoscale electro-mechanical devices.
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Affiliation(s)
- Jianzhi Gao
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
| | - Lin Tang
- Department of Physics, Tsinghua University, Beijing, 100084, China
| | - Scott Holmes
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
| | - Fangsen Li
- Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Richard E Palmer
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
| | - Quanmin Guo
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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43
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Liebscher M, Bruhn C, Siemeling U, Baio J, Lu H, Weidner T. The Interaction of 1,1′‐Diphosphaferrocenes with Gold: Molecular Coordination Chemistry and Adsorption on Solid Substrates. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600892] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Michél Liebscher
- Institute of Chemistry University of Kassel 34109 Kassel Germany
- Center for Interdisciplinary Nanostructure Science and Technology (CINSaT) University of Kassel 34109 Kassel Germany
| | - Clemens Bruhn
- Institute of Chemistry University of Kassel 34109 Kassel Germany
| | - Ulrich Siemeling
- Institute of Chemistry University of Kassel 34109 Kassel Germany
- Center for Interdisciplinary Nanostructure Science and Technology (CINSaT) University of Kassel 34109 Kassel Germany
| | - Joe Baio
- School of Chemical, Biological, and Environmental Engineering Oregon State University 97331 Corvallis OR USA
| | - Hao Lu
- Max Planck Institute for Polymer Research 55128 Mainz Germany
| | - Tobias Weidner
- Max Planck Institute for Polymer Research 55128 Mainz Germany
- Department of Chemistry Aarhus University 8000 Aarhus C Denmark
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44
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Kuang YM, Yu YJ, Luo Y, Zhu JZ, Liao Y, Zhang Y, Dong ZC. Tunneling Electron Induced Fluorescence from Single Porphyrin Molecules Decoupled by Striped-Phase Octanethiol Self-assembled Monolayer. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1506122] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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45
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Yuan M, Tanabe I, Bernard-Schaaf JM, Shi QY, Schlegel V, Schurhammer R, Dowben PA, Doudin B, Routaboul L, Braunstein P. Influence of steric hindrance on the molecular packing and the anchoring of quinonoid zwitterions on gold surfaces. NEW J CHEM 2016. [DOI: 10.1039/c5nj03251b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The N-substituent on quinonoid zwitterions influences the molecules packing and impacts their anchoring on gold surfaces.
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46
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Dugger JW, Webb LJ. Preparation and Characterization of Biofunctionalized Inorganic Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10331-40. [PMID: 26135514 DOI: 10.1021/acs.langmuir.5b01876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Integrating the function of biological molecules into traditional inorganic materials and substrates couples biologically relevant function to synthetic devices and generates new materials and capabilities by combining biological and inorganic functions. At this so-called "bio/abio interface," basic biological functions such as ligand binding and catalysis can be co-opted to detect analytes with exceptional sensitivity or to generate useful molecules with chiral specificity under entirely benign reaction conditions. Proteins function in dynamic, complex, and crowded environments (the living cell) and are therefore appropriate for integrating into multistep, multiscale, multimaterial devices such as integrated circuits and heterogeneous catalysts. However, the goal of reproducing the highly specific activities of biomolecules in the perturbed chemical and electrostatic environment at an inorganic interface while maintaining their native conformations is challenging to achieve. Moreover, characterizing protein structure and function at a surface is often difficult, particularly if one wishes to compare the activity of the protein to that of the dilute, aqueous solution phase. Our laboratory has developed a general strategy to address this challenge by taking advantage of the structural and chemical properties of alkanethiol self-assembled monolayers (SAMs) on gold surfaces that are functionalized with covalently tethered peptides. These surface-bound peptides then act as the chemical recognition element for a target protein, generating a biomimetic surface in which protein orientation, structure, density, and function are controlled and variable. Herein we discuss current research and future directions related to generating a chemically tunable biofunctionalization strategy that has potential to successfully incorporate the highly specialized functions of proteins onto inorganic substrates.
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Affiliation(s)
- Jason W Dugger
- Department of Chemistry, Center for Nano- and Molecular Science and Technology, and Institute for Cell and Molecular Biology, The University of Texas at Austin , 105 E. 24th Street, STOP A5300, Austin, Texas 78712-1224, United States
| | - Lauren J Webb
- Department of Chemistry, Center for Nano- and Molecular Science and Technology, and Institute for Cell and Molecular Biology, The University of Texas at Austin , 105 E. 24th Street, STOP A5300, Austin, Texas 78712-1224, United States
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47
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Oudenhoven TA, Joo Y, Laaser JE, Gopalan P, Zanni MT. Dye aggregation identified by vibrational coupling using 2D IR spectroscopy. J Chem Phys 2015; 142:212449. [DOI: 10.1063/1.4921649] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Tracey A. Oudenhoven
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Yongho Joo
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Jennifer E. Laaser
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Padma Gopalan
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Martin T. Zanni
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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48
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Stolar RB, Guerra E, Shepherd JL. The influence of thiolate readsorption on the quality of mixed monolayers formed through an electrochemcial method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2157-2166. [PMID: 25625688 DOI: 10.1021/la5046767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Lateral Force Microscopy (LFM) was used to probe the quality of binary mixed monolayers formed on planar polycrystalline gold through an electrochemical method. In the approach, portions of a self-assembled monolayer (SAM) composed of 2-aminoethanethiol (AET) were removed from the Au(111) surface facets by selective reductive desorption which maintained undisrupted regions of AET elsewhere on the polycrystalline surface. Monolayer voids created by this method were backfilled with 11-mercaptoundecanoic acid (MUA) and the interface characterized with ex situ LFM. This produced images with domains of high and low friction corresponding to isolated zones of MUA and AET respectively. Reverse sequence mixed monolayers were also prepared with MUA as the starting layer and rendered LFM images that mirrored the AET based layers. This demonstrates flexibility of the electrochemical method to produce heterogeneous binary SAMs, and to further probe the quality of mixed monolayers, a number of experimental conditions including desorption time, electrode configuration, and initial incubation period were studied. AET/MUA layers that produced the most enhanced LFM images were formed on a planar electrode that was vertically submerged into the electrolyte while maintaining a selective desorption potential for 5 min before backfilling with MUA. This condition allowed for the effective diffusion of AET away from the interface and created well-defined monolayer voids for backfilling. At desorption times lower than 1 min, some of the AET molecules that remained near the interface would readsorb onto the surface and interfere with the backfilling process thereby creating lower contrast LFM images. Structural features of these layers were independent of initial incubation time (10 min and 16 h); however, the contrast between domains was improved when using AET layers formed over a longer incubation period. Interestingly, the contrast was significantly reduced when mixed layers were created on electrodes set in a hanging meniscus with the electrolyte. Here, electrochemical evidence pointed to prolonged readsorption of thiolates creating less well-defined voids for backfilling, and the event was most pronounced for MUA based layers.
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Affiliation(s)
- Rylan B Stolar
- Chemistry & Biochemistry Department, Laurentian University , Sudbury, ON, Canada , P3E 2C6
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49
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Abstract
Glycans are chains of carbohydrates attached to proteins (glycoproteins and proteoglycans) or lipids (glycolipids). Glycosylation is a posttranslational modification and glycans have a wide range of functions in a human body including involvement in oncological diseases. Change in a glycan structure cannot only indicate presence of a pathological process, but more importantly in some cases also its stage. Thus, a glycan analysis has a potential to be an effective and reliable tool in cancer diagnostics. Lectins are proteins responsible for natural biorecognition of glycans, even carbohydrate moieties still attached to proteins or whole cells can be recognized by lectins, what makes them an ideal candidate for designing label-free biosensors for glycan analysis. In this review we would like to summarize evidence that glycoprofiling of biomarkers by lectin-based biosensors can be really helpful in detecting prostate cancer.
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Affiliation(s)
- Štefan Belický
- Department of Glycobiotechnology, Center for Glycomics, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, SK - 845 38, Slovakia
| | - Jan Tkac
- Department of Glycobiotechnology, Center for Glycomics, Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, SK - 845 38, Slovakia
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