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Ahlawat M, Sahu A, Govind Rao V. Harnessing Pb-S Interactions for Long-Term Water Stability in Cesium Lead Halide Perovskite Nanocrystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401326. [PMID: 38624177 DOI: 10.1002/smll.202401326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 04/06/2024] [Indexed: 04/17/2024]
Abstract
Lead halide perovskite nanocrystals (LHP NCs) have garnered attention as promising light-harvesting materials for optoelectronics and photovoltaic devices, attributed to their impressive optoelectronic properties. However, their susceptibility to moisture-induced degradation has hindered their practical applications. Despite various encapsulation strategies, challenges persist in maintaining their stability and optoelectronic performance simultaneously. Here, a ligand exchange approach is proposed using (11-mercaptoundecyl)-N,N,N-trimethylammonium bromide (MUTAB) to enhance the stability and dispersibility of CsPbBr3 (CPB) NCs in aqueous environments. MUTAB enables effective surface passivation of the CPB NCs via robust Pb-S interactions at the S-terminal while concurrently directing water molecules through the unbound cationic N-terminal or vice versa, ensuring water dispersibility and stability. Spectroscopic analysis confirms retained structural and optical integrity post-ligand exchange. Crucially, MUTAB-bound CPB NCs exhibit sustained charge transfer properties, demonstrated by aqueous colloidal oxidation reactions. This ligand exchange strategy offers a promising pathway for advancing LHP NCs toward practical optoelectronic and photocatalytic applications.
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Affiliation(s)
- Monika Ahlawat
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Ankita Sahu
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Berhampur, 760010, India
| | - Vishal Govind Rao
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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2
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Sanmartín-Matalobos J, Bermejo-Barrera P, Aboal-Somoza M, Fondo M, García-Deibe AM, Corredoira-Vázquez J, Alves-Iglesias Y. Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection. NANOMATERIALS 2022; 12:nano12142501. [PMID: 35889725 PMCID: PMC9318497 DOI: 10.3390/nano12142501] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 07/17/2022] [Accepted: 07/19/2022] [Indexed: 02/04/2023]
Abstract
Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP–MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.
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Affiliation(s)
- Jesús Sanmartín-Matalobos
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
- Correspondence: (J.S.-M.); (A.M.G.-D.)
| | - Pilar Bermejo-Barrera
- Trace Element, Speciation and Spectroscopy Group (GETEE), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (P.B.-B.); (M.A.-S.)
| | - Manuel Aboal-Somoza
- Trace Element, Speciation and Spectroscopy Group (GETEE), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (P.B.-B.); (M.A.-S.)
| | - Matilde Fondo
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
| | - Ana M. García-Deibe
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
- Correspondence: (J.S.-M.); (A.M.G.-D.)
| | - Julio Corredoira-Vázquez
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
| | - Yeneva Alves-Iglesias
- Coordination and Supramolecular Chemistry Group (SupraMetal), Department of Inorganic Chemistry, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (M.F.); (J.C.-V.); (Y.A.-I.)
- Trace Element, Speciation and Spectroscopy Group (GETEE), Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Chemistry, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain; (P.B.-B.); (M.A.-S.)
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3
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Sher O, Han Y, Xu H, Li H, Daun T, Kumar S, Grigoriev A, Panda PK, Orthaber A, Serein-Spirau F, Jarrosson T, Jafri SHM, Leifer K. Analysis of molecular ligand functionalization process in nano-molecular electronic devices containing densely packed nano-particle functionalization shells. NANOTECHNOLOGY 2022; 33:255706. [PMID: 35276678 DOI: 10.1088/1361-6528/ac5cfc] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Molecular electronic devices based on few and single-molecules have the advantage that the electronic signature of the device is directly dependent on the electronic structure of the molecules as well as of the electrode-molecule junction. In this work, we use a two-step approach to synthesise functionalized nanomolecular electronic devices (nanoMoED). In first step we apply an organic solvent-based gold nanoparticle (AuNP) synthesis method to form either a 1-dodecanethiol or a mixed 1-dodecanethiol/ω-tetraphenyl ether substituted 1-dodecanethiol ligand shell. The functionalization of these AuNPs is tuned in a second step by a ligand functionalization process where biphenyldithiol (BPDT) molecules are introduced as bridging ligands into the shell of the AuNPs. From subsequent structural analysis and electrical measurements, we could observe a successful molecular functionalization in nanoMoED devices as well as we could deduce that differences in electrical properties between two different device types are related to the differences in the molecular functionalization process for the two different AuNPs synthesized in first step. The same devices yielded successful NO2gas sensing. This opens the pathway for a simplified synthesis/fabrication of molecular electronic devices with application potential.
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Affiliation(s)
- Omer Sher
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
| | - Yuanyuan Han
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
| | - Haoyuan Xu
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- School of Metallurgy, Northeastern University, Shenyang City, 110819, People's Republic of China
| | - Hu Li
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- Shandong Technology Centre of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan 250101, People's Republic of China
| | - Tianbo Daun
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
| | - Sharath Kumar
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
| | - Anton Grigoriev
- Condensed Matter Theory, Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala SE-75120, Sweden
| | - Pritam Kumar Panda
- Condensed Matter Theory, Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala SE-75120, Sweden
| | - Andreas Orthaber
- Department of Chemistry, Ångström Laboratory, Uppsala University, PO Box 523, Uppsala SE-75120, Sweden
| | - Francoise Serein-Spirau
- Université de Montpellier, Institut Charles Gerhardt de Montpellier, UMR CNRS 5253, Ecole Nationale Supérieure de Chimie de Montpellier, 1919 route de Mende, F-34000 Montpellier, France
| | - Thibaut Jarrosson
- Université de Montpellier, Institut Charles Gerhardt de Montpellier, UMR CNRS 5253, Ecole Nationale Supérieure de Chimie de Montpellier, 1919 route de Mende, F-34000 Montpellier, France
| | - S Hassan M Jafri
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
| | - Klaus Leifer
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
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Jafri SHM, Hayat A, Wallner A, Sher O, Orthaber A, Ottosson H, Leifer K. Nanomolecular electronic devices based on AuNP molecule nanoelectrodes using molecular place-exchange process. NANOTECHNOLOGY 2020; 31:225207. [PMID: 32066129 DOI: 10.1088/1361-6528/ab76e8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The implementation of electronics applications based on molecular electronics devices is hampered by the difficulty of placing a single or a few molecules with application-specific electronic properties in between metallic nanocontacts. Here, we present a novel method to fabricate 20 nm sized nanomolecular electronic devices (nanoMoED) using a molecular place-exchange process of nonconductive short alkyl thiolates with various short chain conductive oligomers. After the successful place-exchange with short-chain conjugated oligomers in the nanoMoED devices, a change in device resistance of up to four orders of magnitude for 4,4'-biphenyldithiol (BPDT), and up to three orders of magnitude for oligo phenylene-ethynylene (OPE), were observed. The place-exchange process in nanoMoEDs are verified by measuring changes in device resistance during repetitive place-exchange processes between conductive and nonconductive molecules and surface-enhanced Raman spectroscopy. This opens vast possibilities for the fabrication and application of nanoMoED devices with a large variety of molecules.
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Affiliation(s)
- S Hassan M Jafri
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden. Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
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5
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Leifer K, Jafri SHM, Han Y. Nanoparticle Bridges for Studying Electrical Properties of Organic Molecules and Gas Sensor Applications. Methods Mol Biol 2020; 2118:305-325. [PMID: 32152989 DOI: 10.1007/978-1-0716-0319-2_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Molecules have high potential for novel applications as building blocks for electronic devices such as sensors due to the versatility of their electronic properties. Their use in devices offers a great potential for further miniaturization of electronic devices. We describe a method where nanoparticles functionalized with short-chain organic molecules are used to build a molecular electronics device (nanoMoED) sensor for studying electrical properties of organic molecules. We also report the application of such a nanoMoED for detecting environmental gases. Here we provide a detailed description of the nanoMoED fabrication process, nanoparticle synthesis and functionalization, the basics of the electrical measurements, and nanoMoED applications. The platform described here is capable of detecting electrical current flowing through just a few molecules. The versatility of such nanoMoEDs makes this platform suitable for a wide range of molecular electronics and molecular sensing applications.
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Affiliation(s)
- Klaus Leifer
- Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University, UPPSALA, Sweden.
| | - Syed Hassan Mujtaba Jafri
- Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University, UPPSALA, Sweden
- Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir, Pakistan
| | - Yuanyuan Han
- Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University, UPPSALA, Sweden
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6
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Wani IH, Jafri SHM, Warna J, Hayat A, Li H, Shukla VA, Orthaber A, Grigoriev A, Ahuja R, Leifer K. A sub 20 nm metal-conjugated molecule junction acting as a nitrogen dioxide sensor. NANOSCALE 2019; 11:6571-6575. [PMID: 30916070 DOI: 10.1039/c8nr08417c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The interaction of a gas molecule with a sensing material causes the highest change in the electronic structure of the latter, when this material consists of only a few atoms. If the sensing material consists of a short, conductive molecule, the sensing action can be furthermore probed by connecting such molecules to nanoelectrodes. Here, we report that NO2 molecules that adhere to 4,4'-biphenyldithiol (BPDT) bound to Au surfaces lead to a change of the electrical transmission of the BPDT. The related device shows reproducible, stable measurements and is so far the smallest (<20 nm) gas sensor. It demonstrates modulation of charge transport through molecules upon exposure to nitrogen dioxide down to concentrations of 55 ppb. We have evaluated several devices and exposure conditions and obtained a close to linear dependence of the sensor response on the gas concentration.
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Affiliation(s)
- Ishtiaq H Wani
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, Box 534, Uppsala SE-75121, Sweden.
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7
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Jafri SHM, Löfås H, Blom T, Wallner A, Grigoriev A, Ahuja R, Ottosson H, Leifer K. Nano-fabrication of molecular electronic junctions by targeted modification of metal-molecule bonds. Sci Rep 2015; 5:14431. [PMID: 26395225 PMCID: PMC5155674 DOI: 10.1038/srep14431] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 08/25/2015] [Indexed: 11/09/2022] Open
Abstract
Reproducibility, stability and the coupling between electrical and molecular properties are central challenges in the field of molecular electronics. The field not only needs devices that fulfill these criteria but they also need to be up-scalable to application size. In this work, few-molecule based electronics devices with reproducible electrical characteristics are demonstrated. Our previously reported 5 nm gold nanoparticles (AuNP) coated with ω-triphenylmethyl (trityl) protected 1,8-octanedithiol molecules are trapped in between sub-20 nm gap spacing gold nanoelectrodes forming AuNP-molecule network. When the trityl groups are removed, reproducible devices and stable Au-thiol junctions are established on both ends of the alkane segment. The resistance of more than 50 devices is reduced by orders of magnitude as well as a reduction of the spread in the resistance histogram is observed. By density functional theory calculations the orders of magnitude decrease in resistance can be explained and supported by TEM observations thus indicating that the resistance changes and strongly improved resistance spread are related to the establishment of reproducible and stable metal-molecule bonds. The same experimental sequence is carried out using 1,6-hexanedithiol functionalized AuNPs. The average resistances as a function of molecular length, demonstrated herein, are comparable to the one found in single molecule devices.
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Affiliation(s)
- S. Hassan M. Jafri
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, Box 534, Uppsala SE-75121, Sweden
- Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
| | - Henrik Löfås
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala SE-75120, Sweden
| | - Tobias Blom
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, Box 534, Uppsala SE-75121, Sweden
| | - Andreas Wallner
- Department of Chemistry - BMC, Uppsala University, Box 576, Uppsala SE-75123, Sweden
| | - Anton Grigoriev
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala SE-75120, Sweden
| | - Rajeev Ahuja
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala SE-75120, Sweden
- Applied Material Physics, Department of Materials and Engineering, Royal Institute of Technology (KTH), Stockholm SE-10044, Sweden
| | - Henrik Ottosson
- Department of Chemistry - BMC, Uppsala University, Box 576, Uppsala SE-75123, Sweden
| | - Klaus Leifer
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, Box 534, Uppsala SE-75121, Sweden
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8
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Orthaber A, Löfås H, Öberg E, Grigoriev A, Wallner A, Jafri SHM, Santoni MP, Ahuja R, Leifer K, Ottosson H, Ott S. Cooperative Gold Nanoparticle Stabilization by Acetylenic Phosphaalkenes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504834] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Orthaber A, Löfås H, Öberg E, Grigoriev A, Wallner A, Jafri SHM, Santoni MP, Ahuja R, Leifer K, Ottosson H, Ott S. Cooperative Gold Nanoparticle Stabilization by Acetylenic Phosphaalkenes. Angew Chem Int Ed Engl 2015. [PMID: 26211907 PMCID: PMC4557036 DOI: 10.1002/anie.201504834] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Acetylenic phosphaalkenes (APAs) are used as a novel type of ligands for the stabilization of gold nanoparticles (AuNP). As demonstrated by a variety of experimental and analytical methods, both structural features of the APA, that is, the P=C as well as the C≡C units are essential for NP stabilization. The presence of intact APAs on the AuNP is demonstrated by surface-enhanced Raman spectroscopy (SERS), and first principle calculations indicate that bonding occurs most likely at defect sites on the Au surface. AuNP-bound APAs are in chemical equilibrium with free APAs in solution, leading to a dynamic behavior that can be explored for facile place-exchange reactions with other types of anchor groups such as thiols or more weakly binding phosphine ligands.
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Affiliation(s)
- Andreas Orthaber
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden).
| | - Henrik Löfås
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
| | - Elisabet Öberg
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden)
| | - Anton Grigoriev
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
| | - Andreas Wallner
- Department of Chemistry - BMC, Uppsala University, Box 576, 75123 Uppsala (Sweden)
| | - S Hassan M Jafri
- Department of Engineering Sciences, Ångström Laboratories, Uppsala University, Box 534, 75121 Uppsala (Sweden)
| | - Marie-Pierre Santoni
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden)
| | - Rajeev Ahuja
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
| | - Klaus Leifer
- Department of Engineering Sciences, Ångström Laboratories, Uppsala University, Box 534, 75121 Uppsala (Sweden)
| | - Henrik Ottosson
- Department of Chemistry - BMC, Uppsala University, Box 576, 75123 Uppsala (Sweden)
| | - Sascha Ott
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden).
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López-Cebral R, Martín-Pastor M, Seijo B, Sanchez A. Progress in the characterization of bio-functionalized nanoparticles using NMR methods and their applications as MRI contrast agents. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 79:1-13. [PMID: 24815362 DOI: 10.1016/j.pnmrs.2014.01.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 01/13/2014] [Accepted: 01/15/2014] [Indexed: 05/22/2023]
Abstract
Significant progress has been made over the last three decades in the field of NMR, a technique which has proven to have a variety of applications in many scientific disciplines, including nanotechnology. Herein we describe how NMR enables the characterization of nanosystems at different stages of their formation and modification (raw materials, bare or functionalized nanosystems), even making it possible to study in vivo nanoparticle interactions, thereby importantly contributing to nanoparticle design and subsequent optimization. Furthermore, the unique characteristics of nanosystems can open up new prospects for site-targeted, more specific contrast agents, contributing to the development of certain nuclear magnetic resonance applications such as MRI.
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Affiliation(s)
- Rita López-Cebral
- Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Sur, 15782 Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Nuclear Magnetic Resonance Unit, RIADT, University of Santiago de Compostela (USC), Campus Vida, 15706 Santiago de Compostela, Spain
| | - Begoña Seijo
- Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Sur, 15782 Santiago de Compostela, Spain; Molecular ImageGroup, IDIS, Santiago de Compostela University Hospital Complex (CHUS), A Choupana, 15706 Santiago de Compostela, Spain
| | - Alejandro Sanchez
- Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Sur, 15782 Santiago de Compostela, Spain; Molecular ImageGroup, IDIS, Santiago de Compostela University Hospital Complex (CHUS), A Choupana, 15706 Santiago de Compostela, Spain.
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11
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Park JW, Shumaker-Parry JS. Structural Study of Citrate Layers on Gold Nanoparticles: Role of Intermolecular Interactions in Stabilizing Nanoparticles. J Am Chem Soc 2014; 136:1907-21. [DOI: 10.1021/ja4097384] [Citation(s) in RCA: 439] [Impact Index Per Article: 43.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Jong-Won Park
- Department of Chemistry, University of Utah, 1400 East 315 South
RM 2020, Salt Lake City, Utah 84112, United States
| | - Jennifer S. Shumaker-Parry
- Department of Chemistry, University of Utah, 1400 East 315 South
RM 2020, Salt Lake City, Utah 84112, United States
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12
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Li V, Chang AY, Williams TJ. A noncovalent, fluoroalkyl coating monomer for phosphonate-covered nanoparticles. Tetrahedron 2013; 69:7741-7746. [PMID: 23913989 PMCID: PMC3728910 DOI: 10.1016/j.tet.2013.05.092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Gadolinium-containing phosphonate-coated gold nanoparticles were prepared and then non-covalently coated with an amphiphilic fluorous monomer. The monomer spontaneously self-assembles into a non-covalent monolayer shell around the particle. The binding of the shell utilizes a guanidinium-phosphonate interaction analogous to the one exploited by the Wender molecular transporter system. Particle-shell binding was characterized by a 27% decrease in 19F T1 of the fluorous shell upon exposure to the paramagnetic gadolinium in the particle and a corresponding increase in hydrodynamic diameter from 3 nm to 4 nm. Interestingly, a much smaller modulation of 19F T1 is observed when the shell monomer is treated with a phosphonate-free particle. By contrast, the phosphonate-free particle is a much more relaxive 1H T1 agent for water. Together, these observations show that the fluoroalkylguanidinium shell binds selectively to the phosphonate-covered particle. The system's relaxivity and selectivity give it potential for use in 19F based nanotheranostic agents.
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Affiliation(s)
- Vincent Li
- Loker Hydrocarbon Research Institute, Department of Chemistry, University of Southern California, 837 Bloom Walk, Los Angeles, CA 90089-1661, USA
| | - Andy Y. Chang
- The Saban Research Institute of Children's Hospital of Los Angeles, 4650 Sunset Boulevard, Los Angeles, CA 90027-6062, USA
| | - Travis J. Williams
- Loker Hydrocarbon Research Institute, Department of Chemistry, University of Southern California, 837 Bloom Walk, Los Angeles, CA 90089-1661, USA
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Ebeling B, Vana P. RAFT-Polymers with Single and Multiple Trithiocarbonate Groups as Uniform Gold-Nanoparticle Coatings. Macromolecules 2013. [DOI: 10.1021/ma4008626] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Bastian Ebeling
- Institut für Physikalische
Chemie, Georg-August-Universität, Tammannstr. 6, D-37077,
Göttingen, Germany
| | - Philipp Vana
- Institut für Physikalische
Chemie, Georg-August-Universität, Tammannstr. 6, D-37077,
Göttingen, Germany
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14
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Jafri SHM, Löfås H, Fransson J, Blom T, Grigoriev A, Wallner A, Ahuja R, Ottosson H, Leifer K. Identification of vibrational signatures from short chains of interlinked molecule-nanoparticle junctions obtained by inelastic electron tunnelling spectroscopy. NANOSCALE 2013; 5:4673-4677. [PMID: 23619506 DOI: 10.1039/c3nr00505d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Short chains containing a series of metal-molecule-nanoparticle nanojunctions are a nano-material system with the potential to give electrical signatures close to those from single molecule experiments while enabling us to build portable devices on a chip. Inelastic electron tunnelling spectroscopy (IETS) measurements provide one of the most characteristic electrical signals of single and few molecules. In interlinked molecule-nanoparticle (NP) chains containing typically 5-7 molecules in a chain, the spectrum is expected to be a superposition of the vibrational signatures of individual molecules. We have established a stable and reproducible molecule-AuNP multi-junction by placing a few 1,8-octanedithiol (ODT) molecules onto a versatile and portable nanoparticle-nanoelectrode platform and measured for the first time vibrational molecular signatures at complex and coupled few-molecule-NP junctions. From quantum transport calculations, we model the IETS spectra and identify vibrational modes as well as the number of molecules contributing to the electron transport in the measured spectra.
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Affiliation(s)
- S H M Jafri
- Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden
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15
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Löfås H, Orthaber A, Jahn BO, Rouf AM, Grigoriev A, Ott S, Ahuja R, Ottosson H. New Class of Molecular Conductance Switches Based on the [1,3]-Silyl Migration from Silanes to Silenes. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2013; 117:10909-10918. [PMID: 23741530 PMCID: PMC3670211 DOI: 10.1021/jp400062y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 04/02/2013] [Indexed: 06/02/2023]
Abstract
On the basis of first-principles density functional theory calculations, we propose a new molecular photoswitch which exploits a photochemical [1,3]-silyl(germyl) shift leading from a silane to a silene (a Si=C double bonded compound). The silanes investigated herein act as the OFF state, with tetrahedral saturated silicon atoms disrupting the conjugation through the molecules. The silenes, on the other hand, have conjugated paths spanning over the complete molecules and thus act as the ON state. We calculate ON/OFF conductance ratios in the range of 10-50 at a voltage of +1 V. In the low bias regime, the ON/OFF ratio increases to a range of 200-1150. The reverse reaction could be triggered thermally or photolytically, with the silene being slightly higher in relative energy than the silane. The calculated activation barriers for the thermal back-rearrangement of the migrating group can be tuned and are in the range 108-171 kJ/mol for the switches examined herein. The first-principles calculations together with a simple one-level model show that the high ON/OFF ratio in the molecule assembled in a solid state device is due to changes in the energy position of the frontier molecular orbitals compared to the Fermi energy of the electrodes, in combination with an increased effective coupling between the molecule and the electrodes for the ON state.
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Affiliation(s)
- Henrik Löfås
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden
| | - Andreas Orthaber
- Department of Chemistry - Ångström, Uppsala University, Box 523, SE-75120, Uppsala, Sweden
| | - Burkhard O. Jahn
- Department of Chemistry - BMC, Uppsala University, Box 576, SE-75123, Uppsala, Sweden
| | - Alvi M. Rouf
- Department of Chemistry - BMC, Uppsala University, Box 576, SE-75123, Uppsala, Sweden
- Institute of Chemistry, University of the Punjab, New Campus, P.O. Box 54590,
Lahore, Pakistan
| | - Anton Grigoriev
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden
| | - Sascha Ott
- Department of Chemistry - Ångström, Uppsala University, Box 523, SE-75120, Uppsala, Sweden
| | - Rajeev Ahuja
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden
- Materials
Physics, Department
of Materials and Engineering, Royal Institute of Technology
(KTH), SE-10044, Stockholm, Sweden
| | - Henrik Ottosson
- Department of Chemistry - BMC, Uppsala University, Box 576, SE-75123, Uppsala, Sweden
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16
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Salorinne K, Lahtinen T, Koivisto J, Kalenius E, Nissinen M, Pettersson M, Häkkinen H. Nondestructive Size Determination of Thiol-Stabilized Gold Nanoclusters in Solution by Diffusion Ordered NMR Spectroscopy. Anal Chem 2013; 85:3489-92. [DOI: 10.1021/ac303665b] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Kirsi Salorinne
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
| | - Tanja Lahtinen
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
| | - Jaakko Koivisto
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
| | - Elina Kalenius
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
| | - Maija Nissinen
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
| | - Mika Pettersson
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
| | - Hannu Häkkinen
- Department
of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU, Finland
- Department of Physics, Nanoscience Center, University of Jyväskylä, P.O. Box 35, 40014 JYU,
Finland
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