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Aniu Lincy S, Allwin Richard Y, Vinitha T, Balamurugan K, Dharuman V. Streptavidin Fe 2O 3-gold nanoparticles functionalized theranostic liposome for antibiotic resistant bacteria and biotin sensing. Biosens Bioelectron 2023; 219:114849. [PMID: 36327565 DOI: 10.1016/j.bios.2022.114849] [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: 08/13/2022] [Revised: 10/18/2022] [Accepted: 10/20/2022] [Indexed: 11/19/2022]
Abstract
Novel methods of sensing and treatment required to elicit potent humoral and cellular immune responses. Here, Streptavidin functionalized α-Fe2O3-Au nanoparticles (STV-Mag) loaded cationic carbomate cholesterol is used as a carrier to release antibacterial thymol drug for Staphylococcus aureus (S. aureus) infected Caenorhabditis elegans (C. elegans). Pertaining to theranostic applications, efficient antimicrobial activity, and non-stimulated drug release and biotin dependent S. aureus growth were studied in-vivo. While STV-Mag was tethered on mercaptobenzoic acid (MBA) molecular cushion for label free streptavidin-biotin electrochemical sensing, the STV-Mag-carbomate cholesterol (STV-Mag-cCHOL liposome) vesicle with loaded drug was tethered on MBA for non-stimulant drug release through specific cholesterol-S. aureus interaction and confirmed electrochemically. Selectivity was confirmed using other pathogens, E. coli, Proteus and Enterococcus bacterium through antimicrobial studies along with S. aureus. The biotin sensing showed linear range from 10-15 to 10-3 M, which was not obtained by conventional methods. Fourier-Transform Infra-red (FT-IR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) techniques were used to characterize the nanoparticulate system.
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Affiliation(s)
- Sebastinbaskar Aniu Lincy
- Molecular Electronics Laboratory, Department of Bioelectronics and Biosensors, Science Campus, Alagappa University, Karaikudi, 630003, Tamilnadu, India
| | - Yesurajan Allwin Richard
- Molecular Electronics Laboratory, Department of Bioelectronics and Biosensors, Science Campus, Alagappa University, Karaikudi, 630003, Tamilnadu, India
| | - Thondimuthu Vinitha
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, 630003, Tamilnadu, India
| | - Krishnaswamy Balamurugan
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, 630003, Tamilnadu, India
| | - Venkataraman Dharuman
- Molecular Electronics Laboratory, Department of Bioelectronics and Biosensors, Science Campus, Alagappa University, Karaikudi, 630003, Tamilnadu, India.
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Ellner M, Pou P, Pérez R. Molecular Identification, Bond Order Discrimination, and Apparent Intermolecular Features in Atomic Force Microscopy Studied with a Charge Density Based Method. ACS NANO 2019; 13:786-795. [PMID: 30605593 DOI: 10.1021/acsnano.8b08209] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We introduce an efficient method to simulate high-resolution atomic force microscopy (HR-AFM) images with CO probes. Our model explicitly takes into account the charge densities of the sample and the probe for the calculation of the short-range (SR) interaction and retains ab initio accuracy with only two parameters, that are essentially universal, independent of the number of chemical species and the complexity of the bonding topology. The application to molecular images shows a strong dependence on the stoichiometry and bonding configuration that precludes the chemical identification of individual atoms based on local force-distance curves. However, we have identified features in the 2D images and 3D force maps that reflect the highly anisotropic spatial decay of the molecular charge density and provide a way toward molecular identification. The model treats SR and electrostatics interactions on an equal footing and correctly pinpoints the Pauli repulsion as the underlying interaction responsible for the bond order discrimination in C60. Finally, we settle the controversy regarding the origin of the intermolecular features, discarding the effect of the charge redistribution associated with the H bonds, and linking them with the overlap of the wave functions of the atoms that constitute the bond. This overlap creates saddle regions in the potential energy landscape that are sensed by the probe.
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Affiliation(s)
- Michael Ellner
- Departamento de Física Teórica de la Materia Condensada , Universidad Autónoma de Madrid , E-28049 Madrid , Spain
| | - Pablo Pou
- Departamento de Física Teórica de la Materia Condensada , Universidad Autónoma de Madrid , E-28049 Madrid , Spain
- Condensed Matter Physics Center (IFIMAC) , Universidad Autónoma de Madrid , E-28049 Madrid , Spain
| | - Rubén Pérez
- Departamento de Física Teórica de la Materia Condensada , Universidad Autónoma de Madrid , E-28049 Madrid , Spain
- Condensed Matter Physics Center (IFIMAC) , Universidad Autónoma de Madrid , E-28049 Madrid , Spain
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Jasper-Tönnies T, Poltavsky I, Ulrich S, Moje T, Tkatchenko A, Herges R, Berndt R. Stability of functionalized platform molecules on Au(111). J Chem Phys 2018; 149:244705. [PMID: 30599747 DOI: 10.1063/1.5059344] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Trioxatriangulenium (TOTA) platform molecules were functionalized with methyl, ethyl, ethynyl, propynyl, and hydrogen and sublimated onto Au(111) surfaces. Low-temperature scanning tunneling microscopy data reveal that >99% of ethyl-TOTA and methyl-TOTA remain intact, whereas 60% of H-TOTA and >99% of propynyl-TOTA and ethynyl-TOTA decompose. The observed tendency toward fragmentation on Au(111) is opposite to the sequence of gas-phase stabilities of the molecules. Although Au(111) is the noblest of all metal surfaces, the binding energies of the decomposition products to Au(111) destabilize the functionalized platforms by 2 to 3.9 eV (190-370 kJ/mol) and even render some of them unstable as revealed by density functional theory calculations. Van der Waals forces are important, as they drive the adsorption of the platform molecules.
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Affiliation(s)
- Torben Jasper-Tönnies
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Igor Poltavsky
- Physics and Materials Science Research Unit, University of Luxembourg, Luxembourg City L-1511, Luxembourg
| | - Sandra Ulrich
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Tobias Moje
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Alexandre Tkatchenko
- Physics and Materials Science Research Unit, University of Luxembourg, Luxembourg City L-1511, Luxembourg
| | - Rainer Herges
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
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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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Gross L, Schuler B, Pavliček N, Fatayer S, Majzik Z, Moll N, Peña D, Meyer G. Rasterkraftmikroskopie für die molekulare Strukturaufklärung. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201703509] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Leo Gross
- IBM Research - Zürich; 8803 Rüschlikon Schweiz
| | - Bruno Schuler
- IBM Research - Zürich; 8803 Rüschlikon Schweiz
- Molecular Foundry; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
| | | | | | | | | | - Diego Peña
- Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica; Universidade de Santiago de Compostela; Santiago de Compostela 15782 Spanien
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6
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Gross L, Schuler B, Pavliček N, Fatayer S, Majzik Z, Moll N, Peña D, Meyer G. Atomic Force Microscopy for Molecular Structure Elucidation. Angew Chem Int Ed Engl 2018; 57:3888-3908. [DOI: 10.1002/anie.201703509] [Citation(s) in RCA: 107] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 08/14/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Leo Gross
- IBM Research-Zurich; 8803 Rüschlikon Switzerland
| | - Bruno Schuler
- IBM Research-Zurich; 8803 Rüschlikon Switzerland
- Current address: Molecular Foundry; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
| | | | | | - Zsolt Majzik
- IBM Research-Zurich; 8803 Rüschlikon Switzerland
| | - Nikolaj Moll
- IBM Research-Zurich; 8803 Rüschlikon Switzerland
| | - Diego Peña
- Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica; Universidade de Santiago de Compostela; Santiago de Compostela 15782 Spain
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Peng Y, Jin X, Zheng Y, Han D, Liu K, Jiang L. Direct Imaging of Superwetting Behavior on Solid-Liquid-Vapor Triphase Interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28869679 DOI: 10.1002/adma.201703009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 07/17/2017] [Indexed: 05/11/2023]
Abstract
A solid-liquid-vapor interface dominated by a three-phase contact line usually serves as an active area for interfacial reactions and provides a vital clue to surface behavior. Recently, direct imaging of the triphase interface of superwetting interfaces on the microscale/nanoscale has attracted broad scientific attention for both theoretical research and practical applications, and has gradually become an efficient and intuitive approach to explore the wetting behaviors of various multiphase interfaces. Here, recent progress on characterizing the solid-liquid-vapor triphase interface on the microscale/nanoscale with diverse types of imaging apparatus is summarized. Moreover, the accurate, visible, and quantitative information that can be obtained shows the real interfacial morphology of the wetting behaviors of multiphase interfaces. On the basis of fundamental research, technical innovations in imaging and complicated multiphase interfaces of the superwetting surface are also briefly presented.
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Affiliation(s)
- Yun Peng
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Xu Jin
- Research Institute of Petroleum, Exploration and Development, Petro China, Beijing, 100191, P. R. China
| | - Yongmei Zheng
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Dong Han
- National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Kesong Liu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
- Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
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Buchmann K, Hauptmann N, Foster AS, Berndt R. Submolecular resolution in scanning probe images of Sn-phthalocyanines on Cu(1 0 0) using metal tips. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:394004. [PMID: 28677588 DOI: 10.1088/1361-648x/aa7dbd] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Single Sn-phthalocyanine (SnPc) molecules adsorb on Cu(1 0 0) with the Sn ion above (Sn-up) or below (Sn-down) the molecular plane. Here we use a combination of atomic force microscopy (AFM), scanning tunnelling microscopy (STM) and first principles calculations to understand the adsorption configuration and origin of observed contrast of molecules in the Sn-down state. AFM with metallic tips images the pyrrole nitrogen atoms in these molecules as attractive features while STM reveals a chirality of the electronic structure of the molecules close to the Fermi level [Formula: see text] which is not observed in AFM. Using density functional theory calculations, the origin of the submolecular contrast is analysed and, while the electrostatic forces turn out to be negligible, the van der Waals interaction between the phenyl rings of SnPc and the substrate deform the molecule, push the pyrrole nitrogen atoms away from the substrate and thus induce the observed submolecular contrast. Simulated STM images reproduce the chirality of the electronic structure near [Formula: see text].
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Affiliation(s)
- Kristof Buchmann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
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Jelínek P. High resolution SPM imaging of organic molecules with functionalized tips. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:343002. [PMID: 28749786 DOI: 10.1088/1361-648x/aa76c7] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
One of the most remarkable and exciting achievements in the field of scanning probe microscopy (SPM) in the last years is the unprecedented sub-molecular resolution of both atomic and electronic structures of single molecules deposited on solid state surfaces. Despite its youth, the technique has already brought many new possibilities to perform different kinds of measurements, which cannot be accomplished by other techniques. This opens new perspectives in advanced characterization of physical and chemical processes and properties of molecular structures on surfaces. Here, we discuss the history and recent progress of the high resolution imaging with a functionalized probe by means of atomic force microscopy (AFM), scanning tunnelling microscopy (STM) and inelastic electron tunneling spectroscopy (IETS). We describe the mechanisms responsible for the high-resolution AFM, STM and IETS-STM contrast. The complexity of this technique requires new theoretical approaches, where a relaxation of the functionalized probe is considered. We emphasise the similarities of the mechanism driving high-resolution SPM with other imaging methods. We also summarise briefly significant achievements and progress in different branches. Finally we provide brief perspectives and remaining challenges of the further refinement of these high-resolution methods.
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Affiliation(s)
- Pavel Jelínek
- Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00, Prague, Czech Republic
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Rodríguez González MC, Carro P, Pensa E, Vericat C, Salvarezza R, Hernández Creus A. The Role of a Double Molecular Anchor on the Mobility and Self-Assembly of Thiols on Au(111): The Case of Mercaptobenzoic Acid. Chemphyschem 2017; 18:804-811. [DOI: 10.1002/cphc.201601313] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Revised: 01/09/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Miriam C. Rodríguez González
- Área de Química Física; Departamento de Química; Facultad de Ciencias; Universidad de La Laguna, Instituto de Materiales y Nanotecnología; 38200- La Laguna Tenerife Spain
| | - Pilar Carro
- Área de Química Física; Departamento de Química; Facultad de Ciencias; Universidad de La Laguna, Instituto de Materiales y Nanotecnología; 38200- La Laguna Tenerife Spain
| | - Evangelina Pensa
- Instituto de Investigaciones Fisicoquímicas, Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata-CONICET- Sucursal 4; Casilla de Correo 16 1900 La Plata Argentina
- Current Address: EP Imperial College London; Department of Chemistry; Exhibition Road London SW7 2AZ UK
| | - Carolina Vericat
- Instituto de Investigaciones Fisicoquímicas, Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata-CONICET- Sucursal 4; Casilla de Correo 16 1900 La Plata Argentina
| | - Roberto Salvarezza
- Instituto de Investigaciones Fisicoquímicas, Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata-CONICET- Sucursal 4; Casilla de Correo 16 1900 La Plata Argentina
| | - Alberto Hernández Creus
- Área de Química Física; Departamento de Química; Facultad de Ciencias; Universidad de La Laguna, Instituto de Materiales y Nanotecnología; 38200- La Laguna Tenerife Spain
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