1
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Herchenbach PJ, Layman BR, Dick JE. Quantifying the interfacial tension of adsorbed droplets on electrified interfaces. J Colloid Interface Sci 2024; 674:474-481. [PMID: 38941939 DOI: 10.1016/j.jcis.2024.06.141] [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: 03/06/2024] [Revised: 06/16/2024] [Accepted: 06/19/2024] [Indexed: 06/30/2024]
Abstract
HYPOTHESIS This paper develops a new measurement method to answer the question: How does one measure the interfacial tension of adsorbed droplets? EXPERIMENTS This measurement is based on the placement of a bubble at a water|organic interface. To prove the concept, a bubble was formed by pipetting gas below the water|1,2-dichloroethane interface. Our values agree well with previous reports. We then extended the measurement modality to a more difficult system: quantifying interfacial tension of 1,2-dichloroethane droplets adsorbed onto conductors. Carbon dioxide was generated in the aqueous phase from the electro-oxidation of oxalate. Given carbon dioxide's solubility in 1,2-dichloroethane, it partitions, a bubble nucleates, and the bubble can be seen by microscopy when driving the simultaneous oxidation of tris(bipyridine)ruthenium (II), a molecule that will interact with CO2.-. and provide light through electrochemiluminescence. We can quantify the interfacial tension of adsorbed droplets, a measurement very difficult performed with more usual techniques, by tracking the growth of the bubble and quantifying the bubble size at the time the bubble breaks through the aqueous|1,2-dichloroethane interface. FINDINGS We found that the interfacial tension of nanoliter 1,2-dichloroethane droplets adsorbed to an electrified interface in water, which was previously immeasurable with current techniques, was one order of magnitude less than the bulk system.
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Affiliation(s)
- Patrick J Herchenbach
- James Tarpo Jr. & Margaret Tarpo Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Brady R Layman
- James Tarpo Jr. & Margaret Tarpo Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Jeffrey E Dick
- James Tarpo Jr. & Margaret Tarpo Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA; Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
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2
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Tarabet M, Muñoz NR, Scanlon MD, Herzog G, Dossot M. Potential-Modulated Surface-Enhanced Raman Spectroscopy of Tolmetin at Gold Nanoparticle Film Functionalized Polarizable Liquid-Liquid Interfaces. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:7936-7947. [PMID: 38774155 PMCID: PMC11103698 DOI: 10.1021/acs.jpcc.4c00937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 04/19/2024] [Accepted: 04/23/2024] [Indexed: 05/24/2024]
Abstract
An aqueous colloidal suspension of gold nanoparticles (AuNPs) may be condensed into a thin fractal film at the polarizable liquid-liquid interface formed between two immiscible electrolyte solutions upon injection of millimolar concentrations of sodium chloride to the aqueous phase. By adjusting the interfacial polarization conditions (negative, intermediate, and positive open-circuit potentials), the morphology of the film is modified, resulting in unique surface plasmon properties of the film, which enable in situ surface-enhanced Raman spectroscopy (SERS). Intense SERS signals are observed at the polarizable liquid-liquid interface when micromolar concentrations of tolmetin, a nonsteroidal anti-inflammatory drug, are entrapped in the AuNP fractal film. The change in the signal intensity, averaged over multiple spectra, with respect to the concentration of tolmetin, depends on the polarization conditions and suggests the presence of chemical-induced damping effects on the surface plasmons of the gold film.
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Affiliation(s)
- Madjid Tarabet
- Université
de Lorraine, CNRS, LCPME, F-54000 Nancy, France
| | - Nataly Rey Muñoz
- The
Bernal Institute and Department of Chemical Sciences, School of Natural
Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Micheál D. Scanlon
- The
Bernal Institute and Department of Chemical Sciences, School of Natural
Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | | | - Manuel Dossot
- Université
de Lorraine, CNRS, LCPME, F-54000 Nancy, France
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3
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Fink Z, Wu X, Kim PY, McGlasson A, Abdelsamie M, Emrick T, Sutter-Fella CM, Ashby PD, Helms BA, Russell TP. Mixed Nanosphere Assemblies at a Liquid-Liquid Interface. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308560. [PMID: 37994305 DOI: 10.1002/smll.202308560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 10/23/2023] [Indexed: 11/24/2023]
Abstract
The in-plane packing of gold (Au), polystyrene (PS), and silica (SiO2) spherical nanoparticle (NP) mixtures at a water-oil interface is investigated in situ by UV-vis reflection spectroscopy. All NPs are functionalized with carboxylic acid such that they strongly interact with amine-functionalized ligands dissolved in an immiscible oil phase at the fluid interface. This interaction markedly increases the binding energy of these nanoparticle surfactants (NPSs). The separation distance between the Au NPSs and Au surface coverage are measured by the maximum plasmonic wavelength (λmax) and integrated intensities as the assemblies saturate for different concentrations of non-plasmonic (PS/SiO2) NPs. As the PS/SiO2 content increases, the time to reach intimate Au NP contact also increases, resulting from their hindered mobility. λmax changes within the first few minutes of adsorption due to weak attractive inter-NP forces. Additionally, a sharper peak in the reflection spectrum at NP saturation reveals tighter Au NP packing for assemblies with intermediate non-plasmonic NP content. Grazing incidence small angle X-ray scattering (GISAXS) and scanning electron microscopy (SEM) measurements confirm a decrease in Au NP domain size for mixtures with larger non-plasmonic NP content. The results demonstrate a simple means to probe interfacial phase separation behavior using in situ spectroscopy as interfacial structures densify into jammed, phase-separated NP films.
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Affiliation(s)
- Zachary Fink
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA, 01003, USA
| | - Xuefei Wu
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Paul Y Kim
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Alex McGlasson
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA, 01003, USA
| | - Maged Abdelsamie
- Material Science and Engineering Department, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, 31261, Saudi Arabia
- Interdisciplinary Research Center for Intelligent Manufacturing and Robotics, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, 31261, Saudi Arabia
| | - Todd Emrick
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA, 01003, USA
| | | | - Paul D Ashby
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Brett A Helms
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Thomas P Russell
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA, 01003, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
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4
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Cameron H, Zhang Y, Curtis I, Gamble L, Meli MV. Tunable Approach to Induce the Formation of Flexible Nanofilms from Small (3 nm) Gold Nanoparticles at Oil-Water Interfaces. J Phys Chem B 2024; 128:1098-1107. [PMID: 38236183 DOI: 10.1021/acs.jpcb.3c07271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
The self-assembly of gold nanoparticles (AuNPs) into thin films at the liquid-liquid interface has promising applications in industries such as catalysis, optics, and sensors. However, precise control over their formation is complex, influenced by several factors which scale differently with core size. Due to their small free energy of adsorption, there are few examples of AuNPs with core diameters <10 nm. The present research evaluates the adsorption of ∼3 nm AuNPs from either side of the oil-aqueous interface with variations in ligand shell composition, the oil phase composition, and the structure of alcohol additives to best drive thin-film formation. Film formation and quality are evaluated, and a recent thermodynamic model is used to gain insight into the primary forces promoting this adsorption. Results demonstrate that longer-chain alcohol additives (namely, n-butanol and n-hexanol) induced adsorption more efficiently than shorter-chain alcohols (ethanol). The volume of alcohol additive needed to induce adsorption was dependent upon the ligand composition, suggesting that the mechanism for induced interfacial adsorption is via interaction with the AuNP ligand shell. Comparison with the thermodynamic model indicates that the driving force for this induced adsorption is the alteration of the three-phase contact angle. Additionally, the use of various oils demonstrates that as oil-water interfacial tension increases, more AuNPs adsorb to the interface. This relationship is also supported by the model. Insight gained for favorable conditions of adsorption for AuNPs < 10 nm as well as the underlying thermodynamic mechanism is important in working toward the ability to fine-tune such films for industrial applications.
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Affiliation(s)
- Hannah Cameron
- Department of Chemistry and Biochemistry, Mount Allison University, 63C York Street, Sackville, New Brunswick E4L 1G8, Canada
| | - Yuwei Zhang
- Department of Chemistry and Biochemistry, Mount Allison University, 63C York Street, Sackville, New Brunswick E4L 1G8, Canada
| | - Isabel Curtis
- Department of Chemistry and Biochemistry, Mount Allison University, 63C York Street, Sackville, New Brunswick E4L 1G8, Canada
| | - Leah Gamble
- Department of Chemistry and Biochemistry, Mount Allison University, 63C York Street, Sackville, New Brunswick E4L 1G8, Canada
| | - M-Vicki Meli
- Department of Chemistry and Biochemistry, Mount Allison University, 63C York Street, Sackville, New Brunswick E4L 1G8, Canada
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5
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Suárez-Herrera MF, Gamero-Quijano A, Scanlon MD. Electrosynthesis of poly(2,5-dimercapto-1,3,4-thiadiazole) films and their composites with gold nanoparticles at a polarised liquid|liquid interface. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140677] [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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Zhou B, Qu C, Du S, Gao W, Zhang Y, Ding Y, Wang H, Hou R, Su M, Liu H. Multi-analyte High-Throughput Microplate-SERS Reader with Controllable Liquid Interfacial Arrays. Anal Chem 2022; 94:7528-7535. [PMID: 35581026 DOI: 10.1021/acs.analchem.2c00252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-throughput surface-enhanced Raman scattering (SERS) reader, especially for liquid sample testing, is of great significance and huge demand in biology, environment, and other analytical fields. Inspired by the principle of microplate reader, herein, we developed a microplate-SERS reader for semiautomatic and high-throughput assays by virtue of three-dimensional liquid interfacial arrays (LIAs). For the first time, the formation of LIA in oil-in-water state, water-in-oil state, and two-dimensional plane state is realized by operating the hydrophilicity (contact angle) of the container. Through the force analysis of LIA, the effect of organic (O) phase density on the relative position of LIA was quantified. In addition, the optimized reader offers fast and continuous semiautomatic detection of 12 samples below 10 min with great signal reproducibility (calibration with the characteristic peak of O phase as the internal standard). The isolated wells in the microplate prevent analyte cross talk, allowing accurate quantification of each sample. Multiplex analysis capability highlights that this reader has the ability of rapid identification and quantification of samples containing various analytes and concentrations. The results demonstrate high-resolution dual and triple analyte detection with fully preserved signal and Raman features of individual analytes in a mixture, which implies that it also has excellent anticounterfeiting applications. This microplate-SERS reader combines the superior advantages of the LIA, microplate, and SERS techniques to retrieve the molecular vibrational fingerprints of various chemicals in complex media.
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Affiliation(s)
- Baomei Zhou
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Cheng Qu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Shanshan Du
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Wanjun Gao
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, Anhui 230036, China
| | - Yu Zhang
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yan Ding
- Department of Radiation Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
| | - Hongyan Wang
- Department of Radiation Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
| | - Ruyan Hou
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, Anhui 230036, China
| | - Mengke Su
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China.,State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, Anhui 230036, China
| | - Honglin Liu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
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7
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Huo C, Han W, Tang W, Duan X. Stable SERS substrate based on highly reflective metal liquid-like films wrapped hydrogels for direct determination of small molecules in a high protein matrix. Talanta 2021; 234:122678. [PMID: 34364478 DOI: 10.1016/j.talanta.2021.122678] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 06/26/2021] [Accepted: 06/27/2021] [Indexed: 11/26/2022]
Abstract
The study of the interaction between small molecules and proteins is important. Surface-enhanced Raman spectroscopy (SERS) is suitable for such applications since it has the power of detecting a molecule based on its intrinsic nature and without labeling. Herein, the MeLLFs@PAAG SERS substrate supporting highly reflective metal liquid-like films (MeLLFs) with polyacrylamide hydrogels (PAAG) has high-density "hot spots" to provide excellent SERS activity. The MeLLFs@PAAG formed by AgNPs only has less than 15% SERS activity loss when stored in the air for more than three weeks. By using rhodamine 6G (R6G) as a model analyte, the AgNPs based MeLLFs@PAAG SERS substrate exhibits an enhancement factor (EF) as high as 8.0 × 106, a limit of detection (LOD) of 76.8 pM (S/N = 3). Also, the formed PAAG provided a 3D molecular network to orderly secure the assembled nanoparticles (NPs), which not only improves the stability of NPs but also shields the Raman signal of proteins as high as 45 g/L allowing the direct determination of the binding rate of human serum albumin (HSA) and doxorubicin (DOX). A binding rate of about 70% was detected, which is consistent with previous reports. Thus, proposed the MeLLFs@PAAG SERS substrate can be used as a promising candidate for SERS measurement in complex biological samples.
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Affiliation(s)
- Chengcheng Huo
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province and School of Chemistry and Chemical Engineering, Shaanxi Normal University, 620 Xi Chang'an Street, Xi'an, Shaanxi, 710119, People's Republic of China
| | - Wanying Han
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province and School of Chemistry and Chemical Engineering, Shaanxi Normal University, 620 Xi Chang'an Street, Xi'an, Shaanxi, 710119, People's Republic of China
| | - Wei Tang
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province and School of Chemistry and Chemical Engineering, Shaanxi Normal University, 620 Xi Chang'an Street, Xi'an, Shaanxi, 710119, People's Republic of China
| | - Xinrui Duan
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province and School of Chemistry and Chemical Engineering, Shaanxi Normal University, 620 Xi Chang'an Street, Xi'an, Shaanxi, 710119, People's Republic of China.
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8
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Vialetto J, Anyfantakis M. Exploiting Additives for Directing the Adsorption and Organization of Colloid Particles at Fluid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9302-9335. [PMID: 34327999 DOI: 10.1021/acs.langmuir.1c01029] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The self-assembly of colloids at fluid interfaces is a well-studied research field both for gaining fundamental insights and for material fabrication. The fluid interface allows the confinement of particles in two dimensions and may act as a template for guiding their organization into soft and reconfigurable structures. Additives (e.g., surfactants, salts, and polymers) in the colloidal suspension are routinely used as a practical and effective tool to drive particle adsorption and tune their interfacial organization. However, some phenomena lying at the heart of the accumulation and self-assembly of particles at fluid interfaces remain poorly understood. This Feature Article aims to critically analyze the mechanisms involved in the adsorption and self-organization of micro- and nanoparticles at various fluid interfaces. In particular, we address the role of additives in both promoting the adsorption of particles from the bulk suspension to the fluid interface and in mediating the interactions between interfacial particles. We emphasize how different types of additives play a crucial role in controlling the interactions between suspended particles and the fluid interface as well as the interactions between adsorbed particles, thus dictating the final self-assembled structure. We also critically summarize the main experimental protocols developed for the complete adsorption of particles initially suspended in the bulk. Furthermore, we highlight some special properties (e.g., reconfigurability upon external stimulation and dissipative self-assembly) and the application potential of structures formed by colloid self-organization at fluid interfaces mediated/promoted by additives. We believe our contribution serves both as a practical roadmap to scientists coming from other fields and as a valuable information resource for all researchers interested in this exciting research field.
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Affiliation(s)
- Jacopo Vialetto
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Zürich, Switzerland
| | - Manos Anyfantakis
- Department of Physics and Materials Science, University of Luxembourg, Luxembourg L-1511, Luxembourg
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9
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Robayo-Molina I, Molina-Osorio AF, Guinane L, Tofail SAM, Scanlon MD. Pathway Complexity in Supramolecular Porphyrin Self-Assembly at an Immiscible Liquid-Liquid Interface. J Am Chem Soc 2021; 143:9060-9069. [PMID: 34115491 PMCID: PMC8227452 DOI: 10.1021/jacs.1c02481] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
![]()
Nanostructures that
are inaccessible through spontaneous thermodynamic
processes may be formed by supramolecular self-assembly under kinetic
control. In the past decade, the dynamics of pathway complexity in
self-assembly have been elucidated through kinetic models based on
aggregate growth by sequential monomer association and dissociation.
Immiscible liquid–liquid interfaces are an attractive platform
to develop well-ordered self-assembled nanostructures, unattainable
in bulk solution, due to the templating interaction of the interface
with adsorbed molecules. Here, we report time-resolved in
situ UV–vis spectroscopic observations of the self-assembly
of zinc(II) meso-tetrakis(4-carboxyphenyl)porphyrin (ZnTPPc) at an
immiscible aqueous–organic interface. We show that the kinetically
favored metastable J-type nanostructures form quickly, but then transform
into stable thermodynamically favored H-type nanostructures. Numerical
modeling revealed two parallel and competing cooperative pathways
leading to the different porphyrin nanostructures. These insights
demonstrate that pathway complexity is not unique to self-assembly
processes in bulk solution and is equally valid for interfacial self-assembly.
Subsequently, the interfacial electrostatic environment was tuned
using a kosmotropic anion (citrate) in order to influence the pathway
selection. At high concentrations, interfacial nanostructure formation
was forced completely down the kinetically favored pathway, and only
J-type nanostructures were obtained. Furthermore, we found by atomic
force microscopy and scanning electron microscopy that the J- and
H-type nanostructures obtained at low and high citric acid concentrations,
respectively, are morphologically distinct, which illustrates the
pathway-dependent material properties.
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Affiliation(s)
- Iván Robayo-Molina
- The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Andrés F Molina-Osorio
- The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Luke Guinane
- The Bernal Institute and Department of Physics, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Syed A M Tofail
- The Bernal Institute and Department of Physics, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Micheál D Scanlon
- The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland.,Advanced Materials and Bioengineering (AMBER) Centre, CRANN Institute, Trinity College Dublin (TCD), Dublin 2 D02 PN40, Ireland
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10
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Ye Z, Li C, Chen Q, Xu Y, Bell SEJ. Self-assembly of colloidal nanoparticles into 2D arrays at water-oil interfaces: rational construction of stable SERS substrates with accessible enhancing surfaces and tailored plasmonic response. NANOSCALE 2021; 13:5937-5953. [PMID: 33650605 DOI: 10.1039/d0nr08803j] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Self-assembly at water-oil interfaces has been shown to be a cheap, convenient and efficient route to obtain densely packed layers of plasmonic nanoparticles which have small interparticle distances. This creates highly plasmonically active materials that can be used to give strong SERS enhancement and whose structure means that they are well suited to creating the highly stable, reproducible and uniform substrates that are needed to allow routine and accurate quantitative SERS measurements. A variety of methods have been developed to induce nanoparticle self-assembly at water-oil interfaces, fine tune the surface chemistry and adjust the position of the nanoparticles at the interface but only some of these are compatible with eventual use in SERS, where it is important that target molecules can access the active surface unimpeded. Similarly, it is useful to transform liquid plasmonic arrays into easy-to-handle free-standing solid films but these can only be used as solid SERS substrates if the process leaves the surface nanoparticles exposed. Here, we review the progress made in these research areas and discuss how these developments may lead towards achieving rational construction of tailored SERS substrates for sensitive and quantitative SERS analysis.
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Affiliation(s)
- Ziwei Ye
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK.
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11
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Zhang Z, Liu D, Huo F, Huang S, Cui J, Lu Y, Parkin IP, Guo D. Self-healing on mismatched fractured composite surfaces of SiC with a diameter of 180 nm. NANOSCALE 2020; 12:19617-19627. [PMID: 32584359 DOI: 10.1039/d0nr04127k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Self-healing on fractured surfaces of silicon carbide (SiC) is highly desirable, to avoid the catastrophic failure of high-performance devices working at extreme environments. Nevertheless, self-healing on a fractured surface of an amorphous and crystalline (AAC) composite structure of a brittle nanowire (NW) has not been demonstrated. In this study, self-healing is demonstrated on mismatched fractured surfaces of the AAC composite structure of a brittle solid for a SiC NW with a diameter of 187 nm. Fracture strength is 10.18 GPa for the AAC structure, recovering 11.7% after self-healing on its mismatched fractured surfaces. To the best of our knowledge, we firstly report the self-healing on mismatched fractured surfaces of the AAC structure for a brittle NW. This is a breakthrough of the previous prediction that self-healing could not be realized on a brittle NW with a diameter over 150 nm. A growth of 3 nm was found after self-healing on the gap induced by mismatched fractured surfaces, which is different from previous reports for pure amorphous and monocrystalline brittle NWs. To reduce the potential energy, coherent rebonding and debonding were performed to realize the atomic migration to fill the gap, resulting in the growth of gap of 3 nm to perform self-healing. Our findings shed light on the potential of self-healing for design and fabrication of next-generation high-performance SiC devices used in the vacuum and aerospace industries.
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Affiliation(s)
- Zhenyu Zhang
- Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
| | - Dongdong Liu
- Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
| | - Fengwei Huo
- School of Mechanical and Power Engineering, Yingkou Institute of Technology, Yingkou 115014, China
| | - Siling Huang
- Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
| | - Junfeng Cui
- Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
| | - Yao Lu
- Department of Chemistry, School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK
| | - Ivan P Parkin
- Materials Chemistry Research Centre, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Dongming Guo
- Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
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12
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Ma Y, Sikdar D, He Q, Kho D, Kucernak AR, Kornyshev AA, Edel JB. Self-assembling two-dimensional nanophotonic arrays for reflectivity-based sensing. Chem Sci 2020; 11:9563-9570. [PMID: 34094221 PMCID: PMC8161679 DOI: 10.1039/d0sc02877k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
We propose a nanoplasmonic platform that can be used for sensing trace levels of heavy metals in solutions via simple optical reflectivity measurements. The considered example is a lead sensor, which relies on the lead-mediated assembly of glutathione-functionalized gold nanoparticles (NPs) at a self-healing water/DCE liquid | liquid interface (LLI). Capillary forces tend to trap each NP at the LLI while the negatively charged ligands prevent the NPs settling too close to each other. In the presence of lead, due to chelation between the lead ion and glutathione ligand, the NPs assemble into a dense quasi-2D interfacial array. Such a dense assembly of plasmonic NPs can generate a remarkable broad-band reflectance signal, which is absent when NPs are adsorbed at the interface far apart from each other. The condensing effect of the LLI and the plasmonic coupling effect among the NP array gives rise to a dramatic enhancement of the reflectivity signals. Importantly, we show that our theory of the optical reflectivity from such an array of NPs works in perfect harmony with the physics and chemistry of the system with the key parameter being the interparticle distance at the interface. As a lead sensor, the system is fast, stable, and can achieve detection limits down to 14 ppb. Future alternative recognizing ligands can be used to build sister platforms for detecting other heavy metals. We propose a nanoplasmonic platform that can be used for sensing trace levels of heavy metals in solutions via simple optical reflectivity measurements at the liquid–liquid interface.![]()
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Affiliation(s)
- Ye Ma
- Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus 80 Wood Lane W12 0BZ UK .,School of Materials Science and Engineering, Ocean University of China Qingdao 266100 China
| | - Debabrata Sikdar
- Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus 80 Wood Lane W12 0BZ UK .,Department of Electronics and Electrical Engineering, Indian Institute of Technology Guwahati Guwahati-781039 India
| | - Qian He
- Key Lab of Marine Chemistry Theory & Technology, Ministry Education, Ocean University of China Qingdao 266100 China
| | - Daniel Kho
- Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus 80 Wood Lane W12 0BZ UK
| | - Anthony R Kucernak
- Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus 80 Wood Lane W12 0BZ UK
| | - Alexei A Kornyshev
- Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus 80 Wood Lane W12 0BZ UK
| | - Joshua B Edel
- Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus 80 Wood Lane W12 0BZ UK
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13
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Bebon R, Majee A. Electrostatic pair-interaction of nearby metal or metal-coated colloids at fluid interfaces. J Chem Phys 2020; 153:044903. [PMID: 32752694 DOI: 10.1063/5.0013298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
In this paper, we theoretically study the electrostatic interaction between a pair of identical colloids with constant surface potentials sitting in close vicinity next to each other at the fluid interface. By employing a simplified yet reasonable model system, the problem is solved within the framework of classical density functional theory and linearized as well as nonlinear Poisson-Boltzmann (PB) theory. Apart from providing a sound theoretical framework generally applicable to any such problem, our novel findings, all of which contradict common beliefs, include the following: first, quantitative and qualitative differences between the interactions obtained within the linear and the nonlinear PB theories; second, the importance of the electrostatic interaction between the omnipresent three-phase contact lines in interfacial systems; and, third, the occurrence of an attractive electrostatic interaction between a pair of identical metal colloids. The unusual attraction we report largely stems from an attractive line interaction, which although scales linearly with the size of the particle can compete with the surface interactions and can be strong enough to alter the nature of the total electrostatic interaction. Our results should find applications in metal or metal-coated particle-stabilized emulsions where densely packed particle arrays are not only frequently observed but also sometimes required.
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Affiliation(s)
- Rick Bebon
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany and IV. Institute for Theoretical Physics, University of Stuttgart, Stuttgart, Germany
| | - Arghya Majee
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany and IV. Institute for Theoretical Physics, University of Stuttgart, Stuttgart, Germany
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14
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Du S, Su M, Jiang Y, Yu F, Xu Y, Lou X, Yu T, Liu H. Direct Discrimination of Edible Oil Type, Oxidation, and Adulteration by Liquid Interfacial Surface-Enhanced Raman Spectroscopy. ACS Sens 2019; 4:1798-1805. [PMID: 31251024 DOI: 10.1021/acssensors.9b00354] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The quality and safety of edible oils is a momentous but formidable challenge, especially regarding identification of oil type, oxidation, and adulteration. Most conventional analytical methods have bottlenecks in sensitivity, specificity, accessibility, or reliability. Surface-enhanced Raman spectroscopy (SERS) is promising as an unlabeled and ultrasensitive technique but limited by modification of inducers or surfactants on metal surfaces for oil analysis. Here, we develop a quantitative SERS analyzer on two-liquid interfacial plasmonic arrays for direct quality classification of edible oils by a portable Raman device. The interfacial plasmonic array is self-assembled through mixing the gold nanoparticle (GNP) sols and oil sample dissolved in chloroform without any surfactants or pretreatments. Different kinds of edible oils dissolved in chloroform directly participate in self-assembly of plasmonic arrays that finally localizes onto a three-dimensional (3D) oil/water interface. The 3D plasmonic array is self-healing, shape adaptive, and can be transferred to any glass containers as a substrate-free SERS analyzer for direct Raman measurements. It produces sensitive responses of SERS on different kinds of edible oils. By virtue of principal component analysis (PCA), this analyzer is able to quickly distinguish six edible oils, oxidized oils, and adulterated oils. Moreover, the solvent chloroform generates unique and stable SERS bands that can utilized as an inherent internal standard (IIS) to calibrate SERS fluctuation and greatly improve quantitation accuracy. Compared to conventional lab methods, this analyzer avoids complex and time-consuming preprocessing and provides significant advantages in cost, speed, and utility. Our study illuminates a facile way to determine edible oil quality and promises great potential in food quality and safety analysis.
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Affiliation(s)
- Shanshan Du
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Mengke Su
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yifan Jiang
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Fanfan Yu
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yue Xu
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Xuefen Lou
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Ting Yu
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Honglin Liu
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai, 200050, China
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15
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Lakshminarayanan V, Poltorak L, Bosma D, Sudhölter EJR, van Esch JH, Mendes E. Locally pH controlled and directed growth of supramolecular gel microshapes using electrocatalytic nanoparticles. Chem Commun (Camb) 2019; 55:9092-9095. [DOI: 10.1039/c9cc04238e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Micro-shapes of supramolecular hydrogels composed of oriented fibres were grown from locally deposited electrocatalytic Pt NPs after electrochemical pH modulation.
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Affiliation(s)
| | - Lukasz Poltorak
- Delft University of Technology
- Department of Chemical Engineering
- 2629 HZ Delft
- The Netherlands
- University of Lodz
| | - Duco Bosma
- Delft University of Technology
- Department of Chemical Engineering
- 2629 HZ Delft
- The Netherlands
| | - Ernst J. R. Sudhölter
- Delft University of Technology
- Department of Chemical Engineering
- 2629 HZ Delft
- The Netherlands
| | - Jan H. van Esch
- Delft University of Technology
- Department of Chemical Engineering
- 2629 HZ Delft
- The Netherlands
| | - Eduardo Mendes
- Delft University of Technology
- Department of Chemical Engineering
- 2629 HZ Delft
- The Netherlands
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16
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Shi R, Liu X, Ying Y. Facing Challenges in Real-Life Application of Surface-Enhanced Raman Scattering: Design and Nanofabrication of Surface-Enhanced Raman Scattering Substrates for Rapid Field Test of Food Contaminants. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:6525-6543. [PMID: 28920678 DOI: 10.1021/acs.jafc.7b03075] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is capable of detecting a single molecule with high specificity and has become a promising technique for rapid chemical analysis of agricultural products and foods. With a deeper understanding of the SERS effect and advances in nanofabrication technology, SERS is now on the edge of going out of the laboratory and becoming a sophisticated analytical tool to fulfill various real-world tasks. This review focuses on the challenges that SERS has met in this progress, such as how to obtain a reliable SERS signal, improve the sensitivity and specificity in a complex sample matrix, develop simple and user-friendly practical sensing approach, reduce the running cost, etc. This review highlights the new thoughts on design and nanofabrication of SERS-active substrates for solving these challenges and introduces the recent advances of SERS applications in this area. We hope that our discussion will encourage more researches to address these challenges and eventually help to bring SERS technology out of the laboratory.
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Affiliation(s)
- Ruyi Shi
- College of Biosystems Engineering and Food Science , Zhejiang University , 866 Yuhangtang Road , Hangzhou , Zhejiang 310058 , China
| | - Xiangjiang Liu
- College of Biosystems Engineering and Food Science , Zhejiang University , 866 Yuhangtang Road , Hangzhou , Zhejiang 310058 , China
| | - Yibin Ying
- College of Biosystems Engineering and Food Science , Zhejiang University , 866 Yuhangtang Road , Hangzhou , Zhejiang 310058 , China
- Zhejiang A&F University , 88 Huanchengdong Road , Hangzhou , Zhejiang 311300 , China
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17
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Smirnov E, Peljo P, Girault HH. Gold Raspberry-Like Colloidosomes Prepared at the Water-Nitromethane Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2758-2763. [PMID: 29376386 DOI: 10.1021/acs.langmuir.7b03532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, we propose a simple shake-flask method to produce micron-size colloidosomes from a liquid-liquid interface functionalized with a gold nanoparticle (AuNP) film. A step-by-step extraction process of an organic phase partially miscible with water led to the formation of raspberry-like structures covered and protected by a gold nanofilm. The distinctive feature of the prepared colloidosomes is a very thin shell consisting of small AuNPs of 12 or 38 nm in diameter instead of several hundred nanometers reported previously. The interesting and remarkable property of the proposed approach is their reversibility: the colloidosomes may be easily transformed back to a nanofilm state simply by adding pure organic solvent. The obtained colloidosomes have a broadband absorbance spectrum, which makes them of great interest in applications such as photothermal therapy, surface-enhanced Raman spectroscopy studies, and microreactor vesicles for interfacial electrocatalysis.
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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
| | - 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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18
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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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19
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Montelongo Y, Sikdar D, Ma Y, McIntosh AJS, Velleman L, Kucernak AR, Edel JB, Kornyshev AA. Electrotunable nanoplasmonic liquid mirror. NATURE MATERIALS 2017; 16:1127-1135. [PMID: 28892055 DOI: 10.1038/nmat4969] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 07/17/2017] [Indexed: 05/21/2023]
Abstract
Recently, there has been a drive to design and develop fully tunable metamaterials for applications ranging from new classes of sensors to superlenses among others. Although advances have been made, tuning and modulating the optical properties in real time remains a challenge. We report on the first realization of a reversible electrotunable liquid mirror based on voltage-controlled self-assembly/disassembly of 16 nm plasmonic nanoparticles at the interface between two immiscible electrolyte solutions. We show that optical properties such as reflectivity and spectral position of the absorption band can be varied in situ within ±0.5 V. This observed effect is in excellent agreement with theoretical calculations corresponding to the change in average interparticle spacing. This electrochemical fully tunable nanoplasmonic platform can be switched from a highly reflective 'mirror' to a transmissive 'window' and back again. This study opens a route towards realization of such platforms in future micro/nanoscale electrochemical cells, enabling the creation of tunable plasmonic metamaterials.
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Affiliation(s)
- Yunuen Montelongo
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Debabrata Sikdar
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Ye Ma
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Alastair J S McIntosh
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Leonora Velleman
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Anthony R Kucernak
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Joshua B Edel
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Alexei A Kornyshev
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
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20
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Yu Y, Guillaussier A, Voggu VR, Houck DW, Smilgies DM, Korgel BA. Bubble Assemblies of Nanocrystals: Superlattices without a Substrate. J Phys Chem Lett 2017; 8:4865-4871. [PMID: 28933866 DOI: 10.1021/acs.jpclett.7b01595] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A method was developed to create free-standing nanocrystal films in the form of solidified bubbles. Bubbles of octadecanethiol-capped gold nanocrystals were studied by in situ grazing incidence small-angle X-ray scattering (GISAXS) to determine how the absence of an underlying substrate influences a disorder-order transition of a nanocrystal superlattice. We find that the presence of the substrate does not significantly change the nature of the disorder-order transition but does lead to reduced interparticle separation and reduced thermal expansion. Bubble assemblies of silicon and copper selenide nanocrystals are also demonstrated.
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Affiliation(s)
- Yixuan Yu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712-1062, United States
| | - Adrien Guillaussier
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712-1062, United States
| | - Vikas Reddy Voggu
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712-1062, United States
| | - Daniel W Houck
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712-1062, United States
| | - Detlef-M Smilgies
- Cornell High Energy Synchrotron Source (CHESS), Cornell University , Ithaca, New York 14853, United States
| | - Brian A Korgel
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712-1062, United States
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21
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Zhou B, Li X, Tang X, Li P, Yang L, Liu J. Highly Selective and Repeatable Surface-Enhanced Resonance Raman Scattering Detection for Epinephrine in Serum Based on Interface Self-Assembled 2D Nanoparticles Arrays. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7772-7779. [PMID: 28177221 DOI: 10.1021/acsami.6b15205] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Target analyte detection in complex systems with high selectivity and repeatability is crucial to analytical technology and science. Here we present a two-dimensional (2D) surface-enhanced resonance Raman scattering (SERRS) platform, which takes advantages of the high selectivity of the SERRS sensor as well as the sensitivity and reproducibility of the interfacial SERS platform, for detecting trace epinephrine (EP) in the serum. To realize sensitive and selective detection of EP in a complex system, Au NPs are modified with α,β-nitriloacetic acid and Fe(NO3)3 to form the Au NP-(Fe-NTA) sensor, and as a consequence, EP can be rapidly captured by the sensor on the surface of Au NPs and then delivered at the cyclohexane/water interface. More importantly, we synthesized the extremely stable Au NPs (PVP-stabilized Au NPs), where the presence of PVP prevents aggregation of Au NPs during the self-assembly process and then makes a more uniform distribution of Au NPs with analytes at the cyclohexane/water interface, approximately 2 nm interparticle distance between the Au NPs, which has been proved by synchrotron radiation grazing incidence small-angle X-ray scattering (SR-GISAXS) experiments. The self-assembly method not only effectively avoids the aggregation of Au NPs and decreases the influence of the background signal but also can capture and enrich EP molecules in the cyclohexane/water interface, realizing the sensitive and selective detection of EP in complex serum sample. This strategy overcomes the difficulty of bringing nanostructures together to form efficient interparticle distance with simple fabrication and maximum uniformity and also provides a powerful nanosensor for tracing amounts of analyte molecules in a complex system with the advantages of capturing and enriching of target molecules in the liquid/liquid interface during the self-assembly process. Our SERRS platform opens vast possibilities for repeatability, sensitivity, and selectivity detection of targets in various complex fields.
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Affiliation(s)
- Binbin Zhou
- Institute of Intelligent Machines, Chinese Academy of Sciences , Anhui, Hefei 230031, China
- Department of Chemistry, University of Science & Technology of China , Anhui, Hefei 230026, China
| | - Xiaoyun Li
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201204, China
| | - Xianghu Tang
- Institute of Intelligent Machines, Chinese Academy of Sciences , Anhui, Hefei 230031, China
- Department of Chemistry, University of Science & Technology of China , Anhui, Hefei 230026, China
| | - Pan Li
- Institute of Intelligent Machines, Chinese Academy of Sciences , Anhui, Hefei 230031, China
- Department of Chemistry, University of Science & Technology of China , Anhui, Hefei 230026, China
| | - Liangbao Yang
- Institute of Intelligent Machines, Chinese Academy of Sciences , Anhui, Hefei 230031, China
- Department of Chemistry, University of Science & Technology of China , Anhui, Hefei 230026, China
| | - Jinhuai Liu
- Institute of Intelligent Machines, Chinese Academy of Sciences , Anhui, Hefei 230031, China
- Department of Chemistry, University of Science & Technology of China , Anhui, Hefei 230026, China
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22
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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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23
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Smirnov E, Peljo P, Girault HH. Self-assembly and redox induced phase transfer of gold nanoparticles at a water–propylene carbonate interface. Chem Commun (Camb) 2017; 53:4108-4111. [DOI: 10.1039/c6cc09638g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Citrate-stabilized gold nanoparticles were found to spontaneously self-assemble into a lustrous film at a bare water–propylene carbonate interface after vigorous shaking, due to the extremely low interfacial tension. The presence of the electron donor, tetrathiafulvalene, in the oil phase, led to the extraction of particles into the organic phase.
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Affiliation(s)
- 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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24
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Sikdar D, Kornyshev AA. Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces. Sci Rep 2016; 6:33712. [PMID: 27652788 PMCID: PMC5031966 DOI: 10.1038/srep33712] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 08/31/2016] [Indexed: 11/29/2022] Open
Abstract
Two-dimensional arrays of plasmonic nanoparticles at interfaces are promising candidates for novel optical metamaterials. Such systems materialise from ‘top–down’ patterning or ‘bottom–up’ self-assembly of nanoparticles at liquid/liquid or liquid/solid interfaces. Here, we present a comprehensive analysis of an extended effective quasi-static four-layer-stack model for the description of plasmon-resonance-enhanced optical responses of such systems. We investigate in detail the effects of the size of nanoparticles, average interparticle separation, dielectric constants of the media constituting the interface, and the nanoparticle position relative to the interface. Interesting interplays of these different factors are explored first for normally incident light. For off-normal incidence, the strong effects of the polarisation of light are found at large incident angles, which allows to dynamically tune the reflectance spectra. All the predictions of the theory are tested against full-wave simulations, proving this simplistic model to be adequate within the quasi-static limit. The model takes seconds to calculate the system’s optical response and makes it easy to unravel the effect of each system parameter. This helps rapid rationalization of experimental data and understanding of the optical signals from these novel ‘metamaterials’, optimised for light reflection or harvesting.
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Affiliation(s)
- Debabrata Sikdar
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, United Kingdom
| | - Alexei A Kornyshev
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, United Kingdom
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25
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Sikdar D, Hasan SB, Urbakh M, Edel JB, Kornyshev AA. Unravelling the optical responses of nanoplasmonic mirror-on-mirror metamaterials. Phys Chem Chem Phys 2016; 18:20486-98. [DOI: 10.1039/c6cp04551k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quasi-static effective medium theory for mirror-on-mirror platforms based on arrays of plasmonic nanoparticles coupled to a thin metallic film.
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Affiliation(s)
- Debabrata Sikdar
- Department of Chemistry
- Faculty of Natural Sciences
- Imperial College London
- London
- UK
| | - Shakeeb B. Hasan
- Complex Photonic Systems (COPS)
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - Michael Urbakh
- School of Chemistry
- University of Tel-Aviv
- Ramat-Aviv
- Israel
| | - Joshua B. Edel
- Department of Chemistry
- Faculty of Natural Sciences
- Imperial College London
- London
- UK
| | - Alexei A. Kornyshev
- Department of Chemistry
- Faculty of Natural Sciences
- Imperial College London
- London
- UK
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