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Ribeiro JA, Silva AF, Girault HH, Pereira CM. Electroanalytical applications of ITIES - A review. Talanta 2024; 280:126729. [PMID: 39180876 DOI: 10.1016/j.talanta.2024.126729] [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: 01/26/2024] [Revised: 08/14/2024] [Accepted: 08/16/2024] [Indexed: 08/27/2024]
Abstract
Over the last decades, the interface between two immiscible electrolyte solutions (ITIES) attracted considerable attention of the scientific community due to their vast applications, such as extraction, catalysis, partition studies and sensing. The aim of this Review is to highlight the potential of electrochemistry at the ITIES for analytical purposes, focusing on ITIES-based sensors for detection and quantification of chemically and biologically relevant (bio)molecules. We start by addressing the evolution of ITIES in terms of number of publications over the years along with an overview of their main applications (Chapter 1). Then, we provide a general historical perspective about pioneer voltammetric studies at water/oil systems (Chapter 2). After that, we discuss the most impacting improvements on ITIES sensing systems from both perspectives, set-up design (interface stabilization and miniaturization, selection of the organic solvent, etc.) and optimization of experimental conditions to improve selectivity and sensitivity (Chapter 3). In Chapter 4, we discuss the analytical applications of ITIES for electrochemical sensing of several types of analytes, including drugs, pesticides, proteins, among others. Finally, we highlight the present achievements of ITIES as analytical tool and provide future challenges and perspectives for this technology (Chapter 5).
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Affiliation(s)
- José A Ribeiro
- CIQUP/Institute of Molecular Sciences (IMS), Department of Chemistry and Biochemistry, Faculty of Sciences of University of Porto, Rua do Campo Alegre s/n, Porto, 4169-007, Portugal.
| | - A Fernando Silva
- CIQUP/Institute of Molecular Sciences (IMS), Department of Chemistry and Biochemistry, Faculty of Sciences of University of Porto, Rua do Campo Alegre s/n, Porto, 4169-007, Portugal
| | - H H Girault
- Institut des Sciences et Ingénierie Chimiques (ISIC), École Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015, Lausanne, Switzerland
| | - Carlos M Pereira
- CIQUP/Institute of Molecular Sciences (IMS), Department of Chemistry and Biochemistry, Faculty of Sciences of University of Porto, Rua do Campo Alegre s/n, Porto, 4169-007, Portugal.
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2
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Betancourt SNM, Riva JS. Opposite effects produced by Magnetic Nanoparticles:Phospholipid films generated at a liquid/liquid interface, in the drug transfer processes. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.141967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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3
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Jetmore HD, Anupriya ES, Cress TJ, Shen M. Interface between Two Immiscible Electrolyte Solutions Electrodes for Chemical Analysis. Anal Chem 2022; 94:16519-16527. [DOI: 10.1021/acs.analchem.2c01416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Henry David Jetmore
- University of Illinois at Urbana−Champaign, Urbana, Illinois61801, United States
| | | | - Tanner Joe Cress
- University of Illinois at Urbana−Champaign, Urbana, Illinois61801, United States
| | - Mei Shen
- University of Illinois at Urbana−Champaign, Urbana, Illinois61801, United States
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4
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Opallo MW, Dusilo K, Warczak M, Kalisz J. Hydrogen Evolution, Oxygen Evolution and Oxygen Reduction at Polarizable Liquid|Liquid Interfaces. ChemElectroChem 2022. [DOI: 10.1002/celc.202200513] [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)
- Marcin Wojciech Opallo
- Institute of Physical Chemistry, Polish Academy of Sciences Department of Electrode Processes Kasprzaka 44/52 01-224 Warszawa POLAND
| | - Katarzyna Dusilo
- Institute of Physical Chemistry Polish Academy of Sciences Library: Instytut Chemii Fizycznej Polskiej Akademii Nauk Biblioteka Electrode Processes POLAND
| | - Magdalena Warczak
- Institute of Physical Chemistry Polish Academy of Sciences Library: Instytut Chemii Fizycznej Polskiej Akademii Nauk Biblioteka Electrode Processes POLAND
| | - Justyna Kalisz
- University of Warsaw: Uniwersytet Warszawski Chemistry POLAND
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5
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Al Nasser HA, Kim C, Li Q, Bissett MA, Haigh SJ, Dryfe RA. The modified liquid | liquid interface: An electrochemical route for the electrode-less synthesis of MoS2 metal composite thin films. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Aslan E, Yanalak G, Patir IH. In Situ
Generated Amorphous Molybdenum Sulfide on Reduced Graphene Oxide Nanocomposite Catalyst for Hydrogen Evolution in a Biphasic Liquid System. ChemCatChem 2021. [DOI: 10.1002/cctc.202100871] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Emre Aslan
- Department of Biochemistry Selcuk University 42250 Konya Turkey
| | - Gizem Yanalak
- Department of Biochemistry Selcuk University 42250 Konya Turkey
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Koya I, Sakka T, Nishi N. Au Nanofiber/CNT 1D/1D Composites Formed Via Redox Reaction at the Ionic Liquid/Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9553-9559. [PMID: 34319742 DOI: 10.1021/acs.langmuir.1c01433] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Au nanofiber/carbon nanotube (CNT) 1D/1D composites and Janus-type Au/CNT composites have been prepared by utilizing the liquid/liquid interface between water (W) and a hydrophobic ionic liquid (IL) as a redox reaction site. AuCl4- in W is reduced at the IL/W interface where CNTs are adsorbed, by a reducing agent in the IL, leading to the formation of the Au/CNT composites. The Au/CNT composites are Janus-type in which Au microurchins and Au nanofibers are deposited on the W side and the IL side of the CNTs on the IL/W interface, respectively. Reversing the order of the CNT adsorption and AuCl4- reduction results in the formation of the Au nanofiber/CNT composites, which are 1D/1D metal/carbon composites.
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Affiliation(s)
- Ippei Koya
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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8
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Co-deposition of silica and proteins at the interface between two immiscible electrolyte solutions. Bioelectrochemistry 2020; 134:107529. [DOI: 10.1016/j.bioelechem.2020.107529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/02/2020] [Accepted: 04/02/2020] [Indexed: 12/24/2022]
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9
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Qiu H, Jiang T, Wang X, Zhu L, Wang Q, Zhao Y, Ge J, Chen Y. Electrochemical investigation of adsorption of graphene oxide at an interface between two immiscible electrolyte solutions. RSC Adv 2020; 10:25817-25827. [PMID: 35518605 PMCID: PMC9055337 DOI: 10.1039/d0ra02560g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 06/25/2020] [Indexed: 01/18/2023] Open
Abstract
Graphene oxide (GO) has been recognized as an amphiphilic molecule or a soft colloidal particle with the ability to adsorb and assemble at the liquid/liquid (L/L) interface. However, most extant works concerning the adsorption behaviors of GO at the L/L interface have been limited to the non-polarized L/L interface. Here, we studied what would happen if GO nanosheets met with a polarizable L/L interface, namely an interface between two immiscible electrolyte solutions (ITIES). On one hand, the adsorption behavior of GO nanosheets at the L/L interface was electrochemically investigated firstly by using cyclic voltammetry (CV) and alternating current voltammetry (ACV). On the other hand, the influence of the adsorbed GO layers at the L/L interface on the ion transfer reactions was studied by employing ion-transfer voltammetry of TEA+ and ClO4− selected as probe ions. Capacitance measurements show that the interfacial capacitance increases greatly in the presence of GO nanosheets inside the aqueous phase, which can be attributed to the increases of interfacial corrugation and charge density induced by the parallel adsorption and assembly of GO at the L/L interface. In addition, it is found that the application of an interfacial potential difference by external polarization can promote the adsorption of GO at the L/L interface. Moreover, the ion-transfer voltammetric results further demonstrate that the GO layers formed at the interface can suppress the ion transfer reactions due to interfacial blocking and charge screening, as well as the hindrance effect induced by the GO layers. All the results with insights into the interfacial behavior of GO under polarization with an external electric field enable understanding the adsorption behavior of GO at the L/L interface more comprehensively. The adsorption behavior of graphene oxide (GO) nanosheets at an interface between two immiscible electrolyte solutions (ITIES) was electrochemically investigated firstly by using cyclic voltammetry (CV) and alternating current voltammetry (ACV).![]()
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Affiliation(s)
- Haiyan Qiu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Tao Jiang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Xiaoyuan Wang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Lin Zhu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Qingwei Wang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Yun Zhao
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Jianjian Ge
- School of Science, Shanghai Institute of Technology Shanghai 201418 China
| | - Yong Chen
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
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10
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Kowalewska K, Sipa K, Leniart A, Skrzypek S, Poltorak L. Electrochemistry at the liquid–liquid interface rediscovers interfacial polycondensation of nylon-6,6. Electrochem commun 2020. [DOI: 10.1016/j.elecom.2020.106732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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11
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Ghosh SK, Böker A. Self‐Assembly of Nanoparticles in 2D and 3D: Recent Advances and Future Trends. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900196] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
| | - Alexander Böker
- Fraunhofer‐Institut für Angewandte Polymerforschung Geiselbergstraβe 69 14476 Potsdam‐Golm Germany
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12
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13
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14
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Scanlon MD, Smirnov E, Stockmann TJ, Peljo P. Gold Nanofilms at Liquid–Liquid Interfaces: An Emerging Platform for Redox Electrocatalysis, Nanoplasmonic Sensors, and Electrovariable Optics. Chem Rev 2018; 118:3722-3751. [DOI: 10.1021/acs.chemrev.7b00595] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Micheál D. Scanlon
- The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Evgeny Smirnov
- Laboratoire d’Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l’Industrie 17, CH-1951 Sion, Switzerland
| | - T. Jane Stockmann
- Interfaces, Traitements, Organisation et Dynamique des Systèmes, CNRS-UMR 7086, Sorbonne Paris Cité, Paris Diderot University, 15 Rue J.A. Baïf, 75013 Paris, France
| | - Pekka Peljo
- Laboratoire d’Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l’Industrie 17, CH-1951 Sion, Switzerland
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15
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Rabiu AK, Toth PS, Rodgers ANJ, Dryfe RAW. Electrochemical Investigation of Adsorption of Single-Wall Carbon Nanotubes at a Liquid/Liquid Interface. ChemistryOpen 2017; 6:57-63. [PMID: 28168151 PMCID: PMC5288753 DOI: 10.1002/open.201600136] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 11/15/2016] [Indexed: 12/03/2022] Open
Abstract
There is much interest in understanding the interfacial properties of carbon nanotubes, particularly at water/oil interfaces. Here, the adsorption of single-wall carbon nanotubes (SWCNTs) at the water/1,2-dichloroethane (DCE) interface, and the subsequent investigation of the influence of the adsorbed nanotube layer on interfacial ion transfer, is studied by using the voltammetric transfer of tetramethylammonium (TMA+) and hexafluorophosphate (PF6-) as probe ions. The presence of the interfacial SWCNT layer significantly suppresses the transfer of both ions across the interface, with a greater degree of selectivity towards the PF6- ion. This effect was attributed both to the partial blocking of the interface by the SWCNTs and to the potential dependant adsorption of background electrolyte ions on the surface of the SWCNTs, as confirmed by X-ray photoelectron spectroscopy, which is caused by an electrostatic interaction between the interfacial SWCNTs and the transferring ion.
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Affiliation(s)
- Aminu K. Rabiu
- School of ChemistryUniversity of ManchesterOxford RoadManchesterM13 9PLUK
| | - Peter S. Toth
- School of ChemistryUniversity of ManchesterOxford RoadManchesterM13 9PLUK
| | | | - Robert A. W. Dryfe
- School of ChemistryUniversity of ManchesterOxford RoadManchesterM13 9PLUK
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16
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Gschwend GC, Smirnov E, Peljo P, Girault HH. Electrovariable gold nanoparticle films at liquid–liquid interfaces: from redox electrocatalysis to Marangoni-shutters. Faraday Discuss 2017; 199:565-583. [DOI: 10.1039/c6fd00238b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Control over the physical properties of nanoparticle assemblies at a liquid–liquid interface is a key technological advancement to realize the dream of smart electrovariable nanosystems. Electrified interfaces, such as the interface between two immiscible electrolytes solutions (ITIES), are almost an ideal platform for realizing this dream. Here, we show that the Galvani potential difference across soft interfaces can be effectively used to manipulate: (i) the reactivity of gold nanoparticle assemblies through varying the Fermi level (both chemically and electrochemically); (ii) the location distribution of the nanoparticles at the liquid–liquid interface. In the first case, in addition to our previous studies on electron transfer reactions (ET) across the ITIES, we used intensity modulated photocurrent spectroscopy (IMPS) to study the kinetics of photo-induced electrochemical reactions at the ITIES. As expected, the direct adsorption of gold nanoparticles at the interface modifies the kinetics of the ET reaction (so-called, interfacial redox electrocatalysis), however it did not lead to an increased photocurrent by “plasmonic enhancement”. Rather, we found that the product separation depends on double layer effects while the product recombination is controlled by the Galvani potential difference between the two phases. In the second case, we demonstrated that polarizing the ITIES caused migration of gold nanoparticles from the middle region of the cell to its periphery. We called such systems “Marangoni-type shutters”. This type of electrovariable plasmonic system did not experience diffusion limitation in terms of the adsorption/desorption of nanoparticles and the entire movement of nanoparticle assemblies happened almost instantly (within a second). It opens a fresh view on electrovariable plasmonics and presents new opportunities to create smart nanosystems at the ITIES driven with an electric field.
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Affiliation(s)
- Grégoire C. Gschwend
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Hubert H. Girault
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
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17
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Toth PS, Velický M, Bissett MA, Slater TJA, Savjani N, Rabiu AK, Rakowski AM, Brent JR, Haigh SJ, O'Brien P, Dryfe RAW. Asymmetric MoS 2 /Graphene/Metal Sandwiches: Preparation, Characterization, and Application. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:8256-8264. [PMID: 27461734 DOI: 10.1002/adma.201600484] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 04/04/2016] [Indexed: 06/06/2023]
Abstract
The polarizable organic/water interface is used to construct MoS2 /graphene nanocomposites, and various asymmetrically dual-decorated graphene sandwiches are synthesized. High-resolution transmission electron microscopy and 3D electron tomography confirm their structure. These dual-decorated graphene-based hybrids show excellent hydrogen evolution activity and promising capacitance performance.
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Affiliation(s)
- Peter S Toth
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Matĕj Velický
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Mark A Bissett
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Thomas J A Slater
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Nicky Savjani
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Aminu K Rabiu
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Alexander M Rakowski
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Jack R Brent
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Sarah J Haigh
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Paul O'Brien
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
- School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Robert A W Dryfe
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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Smirnov E, Peljo P, Scanlon MD, Gumy F, Girault HH. Self-healing gold mirrors and filters at liquid-liquid interfaces. NANOSCALE 2016; 8:7723-7737. [PMID: 27001646 DOI: 10.1039/c6nr00371k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The optical and morphological properties of lustrous metal self-healing liquid-like nanofilms were systematically studied for different applications (e.g., optical mirrors or filters). These nanofilms were formed by a one-step self-assembly methodology of gold nanoparticles (AuNPs) at immiscible water-oil interfaces, previously reported by our group. We investigated a host of experimental variables and herein report their influence on the optical properties of nanofilms: AuNP mean diameter, interfacial AuNP surface coverage, nature of the organic solvent, and nature of the lipophilic organic molecule that caps the AuNPs in the interfacial nanofilm. To probe the interfacial gold nanofilms we used in situ (UV-vis-NIR spectroscopy and optical microscopy) as well as ex situ (SEM and TEM of interfacial gold nanofilms transferred to silicon substrates) techniques. The interfacial AuNP surface coverage strongly influenced the morphology of the interfacial nanofilms, and in turn their maximum reflectance and absorbance. We observed three distinct morphological regimes; (i) smooth 2D monolayers of "floating islands" of AuNPs at low surface coverages, (ii) a mixed 2D/3D regime with the beginnings of 3D nanostructures consisting of small piles of adsorbed AuNPs even under sub-full-monolayer conditions and, finally, (iii) a 3D regime characterised by the 2D full-monolayer being covered in significant piles of adsorbed AuNPs. A maximal value of reflectance reached 58% in comparison with a solid gold mirror, when 38 nm mean diameter AuNPs were used at a water-nitrobenzene interface. Meanwhile, interfacial gold nanofilms prepared with 12 nm mean diameter AuNPs exhibited the highest extinction intensities at ca. 690 nm and absorbance around 90% of the incident light, making them an attractive candidate for filtering applications. Furthermore, the interparticle spacing, and resulting interparticle plasmon coupling derived optical properties, varied significantly on replacing tetrathiafulvalene with neocuproine as the AuNP capping ligand in the nanofilm. These interfacial nanofilms formed with neocuproine and 38 nm mean diameter AuNPs, at monolayer surface coverages and above, were black due to aggregation and broadband absorbance.
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Affiliation(s)
- Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
| | - Micheál D Scanlon
- Department of Chemistry, the Tyndall National Institute and the Analytical & Biological Chemistry Research Facility (ABCRF), University College Cork, Cork, Ireland
| | - Frederic Gumy
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
| | - Hubert H Girault
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
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19
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Smirnov E, Peljo P, Scanlon MD, Girault HH. Gold Nanofilm Redox Catalysis for Oxygen Reduction at Soft Interfaces. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2015.10.104] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Rodgers ANJ, Velický M, Dryfe RAW. Electrostatic Stabilization of Graphene in Organic Dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13068-13076. [PMID: 26574912 DOI: 10.1021/acs.langmuir.5b04219] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The exfoliation of graphite to give graphene dispersions in nonaqueous solvents is an important area with regards to scalable production of graphene in bulk quantities and its ultimate application in devices. Understanding the mechanisms governing the stability of these dispersions is therefore of both scientific interest and technological importance. Herein, we have used addition of an indifferent electrolyte to perturb few-layer graphene dispersions in a nonaqueous solvent (1,2-dichloroethane) as a way to probe the importance of interparticle electrostatic repulsions toward the overall dispersion stability. At a sufficient electrolyte concentration, complete sedimentation of the dispersions occurred over 24 h, and the relationship between dispersed graphene concentration and electrolyte concentration was consistent with a dispersion stabilized by electrostatic repulsions. We also found that an increased oxygen content in the graphite starting material produced dispersions of greater stability, indicating that the extent of oxidation is an important parameter in determining the extent of electrostatic stabilization in nonaqueous graphene dispersions.
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Affiliation(s)
- Andrew N J Rodgers
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Matěj Velický
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Robert A W Dryfe
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
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21
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Toth P, Rabiu A, Dryfe R. Controlled preparation of carbon nanotube-conducting polymer composites at the polarisable organic/water interface. Electrochem commun 2015. [DOI: 10.1016/j.elecom.2015.08.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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22
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Oxygen Reduction at the Liquid-Liquid Interface: Bipolar Electrochemistry through Adsorbed Graphene Layers. ChemElectroChem 2015. [DOI: 10.1002/celc.201500343] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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