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Haddadnezhad M, Jung I, Oh MJ, Park S. Ready-to-Use Free-Standing Super-Powder Made with Complex Nanoparticles for SERS. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2400068. [PMID: 38555501 DOI: 10.1002/adma.202400068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 03/25/2024] [Indexed: 04/02/2024]
Abstract
This study presents a straightforward and efficient synthetic approach for producing high-yield, ready-to-use, free-standing super-powder. The synthesis protocol demonstrates versatility, enabling the creation of assemblies from various nanoparticle morphologies and compositions without the need for specific substrates. Au nanorings are employed as building blocks for fabricating the super-powder, which can be used in surface-enhanced Raman spectroscopy (SERS). The distinctive aspect ratio of the ring nanoframes allows the formation of densely packed columnar assemblies on the substrate, aligning the exposed gaps perpendicular to the laser beam. This arrangement significantly enhances the charge separation among nanorings, leading to a highly focused near-field that is applicable to SERS analysis. The SERS detection feasibility of this powder in both pre- and post-contamination conditions is demonstrated. Using a wide range of building blocks, encompassing various shapes (for instance, rods, hexagons, cubes, cuboctahedrons, elongated dodecahedrons, triangular rings, double-rings, elongated dodecahedra frames, cuboctahedra frames, and double-walled frames), the generalizability of the process for synthesizing super-powders with diverse morphologies is substantiated.
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Affiliation(s)
| | - Insub Jung
- Department of Chemistry, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
- Institute of Basic Science, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Myeong Jin Oh
- Department of Chemistry, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
| | - Sungho Park
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
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Goldmann C, Chaâbani W, Hotton C, Impéror-Clerc M, Moncomble A, Constantin D, Alloyeau D, Hamon C. Confinement Effects on the Structure of Entropy-Induced Supercrystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2303380. [PMID: 37386818 DOI: 10.1002/smll.202303380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/09/2023] [Indexed: 07/01/2023]
Abstract
Depletion-induced self-assembly is routinely used to separate plasmonic nanoparticles (NPs) of different shapes, but less often for its ability to create supercrystals (SCs) in suspension. Therefore, these plasmonic assemblies have not yet reached a high level of maturity and their in-depth characterization by a combination of in situ techniques is still very much needed. In this work, gold triangles (AuNTs) and silver nanorods (AgNRs) are assembled by depletion-induced self-assembly. Small Angle X-ray Scattering (SAXS) and scanning electron microscopy (SEM) analysis shows that the AuNTs and AgNRs form 3D and 2D hexagonal lattices in bulk, respectively. The colloidal crystals are also imaged by in situ Liquid-Cell Transmission Electron Microscopy. Under confinement, the affinity of the NPs for the liquid cell windows reduces their ability to stack perpendicularly to the membrane and lead to SCs with a lower dimensionality than their bulk counterparts. Moreover, extended beam irradiation leads to disassembly of the lattices, which is well described by a model accounting for the desorption kinetics highlighting the key role of the NP-membrane interaction in the structural properties of SCs in the liquid-cell. The results shed light on the reconfigurability of NP superlattices obtained by depletion-induced self-assembly, which can rearrange under confinement.
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Affiliation(s)
- Claire Goldmann
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405, France
| | - Wajdi Chaâbani
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405, France
| | - Claire Hotton
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405, France
| | - Marianne Impéror-Clerc
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405, France
| | - Adrien Moncomble
- Université Paris-Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, Paris, 75013, France
| | - Doru Constantin
- Institut Charles Sadron, CNRS and Université de Strasbourg, Strasbourg, 67034, France
| | - Damien Alloyeau
- Université Paris-Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, Paris, 75013, France
| | - Cyrille Hamon
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, 91405, France
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3
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Abstract
Nucleation and growth are critical steps in crystallization, which plays an important role in determining crystal structure, size, morphology, and purity. Therefore, understanding the mechanisms of nucleation and growth is crucial to realize the controllable fabrication of crystalline products with desired and reproducible properties. Based on classical models, the initial crystal nucleus is formed by the spontaneous aggregation of ions, atoms, or molecules, and crystal growth is dependent on the monomer's diffusion and the surface reaction. Recently, numerous in situ investigations on crystallization dynamics have uncovered the existence of nonclassical mechanisms. This review provides a summary and highlights the in situ studies of crystal nucleation and growth, with a particular emphasis on the state-of-the-art research progress since the year 2016, and includes technological advances, atomic-scale observations, substrate- and temperature-dependent nucleation and growth, and the progress achieved in the various materials: metals, alloys, metallic compounds, colloids, and proteins. Finally, the forthcoming opportunities and challenges in this fascinating field are discussed.
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Affiliation(s)
- Junjie Li
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, China
| | - Francis Leonard Deepak
- Nanostructured Materials Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330Braga, Portugal
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4
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Deng K, Luo Z, Tan L, Quan Z. Self-assembly of anisotropic nanoparticles into functional superstructures. Chem Soc Rev 2020; 49:6002-6038. [PMID: 32692337 DOI: 10.1039/d0cs00541j] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Self-assembly of colloidal nanoparticles (NPs) into superstructures offers a flexible and promising pathway to manipulate the nanometer-sized particles and thus make full use of their unique properties. This bottom-up strategy builds a bridge between the NP regime and a new class of transformative materials across multiple length scales for technological applications. In this field, anisotropic NPs with size- and shape-dependent physical properties as self-assembly building blocks have long fascinated scientists. Self-assembly of anisotropic NPs not only opens up exciting opportunities to engineer a variety of intriguing and complex superlattice architectures, but also provides access to discover emergent collective properties that stem from their ordered arrangement. Thus, this has stimulated enormous research interests in both fundamental science and technological applications. This present review comprehensively summarizes the latest advances in this area, and highlights their rich packing behaviors from the viewpoint of NP shape. We provide the basics of the experimental techniques to produce NP superstructures and structural characterization tools, and detail the delicate assembled structures. Then the current understanding of the assembly dynamics is discussed with the assistance of in situ studies, followed by emergent collective properties from these NP assemblies. Finally, we end this article with the remaining challenges and outlook, hoping to encourage further research in this field.
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Affiliation(s)
- Kerong Deng
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Key Laboratory of Energy Conversion and Storage Technologies, Ministry of Education, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
| | - Zhishan Luo
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Key Laboratory of Energy Conversion and Storage Technologies, Ministry of Education, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
| | - Li Tan
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Key Laboratory of Energy Conversion and Storage Technologies, Ministry of Education, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
| | - Zewei Quan
- Department of Chemistry, Academy for Advanced Interdisciplinary Studies, Key Laboratory of Energy Conversion and Storage Technologies, Ministry of Education, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
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5
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Wang X, Wu L, Wang G, Chen G. Dynamic Crystallization and Phase Transition in Evaporating Colloidal Droplets. NANO LETTERS 2019; 19:8225-8233. [PMID: 31644299 DOI: 10.1021/acs.nanolett.9b03633] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Evaporating colloidal droplets are an omnipresent phenomenon in nature and engage in many scientific and commercial technologies. Despite their apparent importance, many of the fundamental aspects remain unknown, particularly the relationships between evaporation kinetics, volume fraction, crystallization, and phase transition. Here, we follow the structural evolution and drying dynamics across the liquid-to-solid transition of evaporating colloidal droplets containing polystyrene nanospheres with both spatial and temporal resolutions through the in situ small-angle X-ray scattering and ex situ electron microscopy techniques. We find the unconventional evaporation-driven heterogeneous crystallization and the sequential stacking of face-centered cubic (fcc), random hexagonal close-packed (rhcp), and random close-packed (rcp) superlattice structures. The crystallization and phase transition processes are further elucidated and coordinated with the real-time volume fraction variation, which constitutes a rich and dynamic picture of the self-assembly process. Starting with the Onsager principle, we provide quantitative analysis to the evaporation kinetics, including concentration gradient, gelation, and cavitation. Our findings impart a new mechanism of dynamic nucleation and crystallization and reveal the intimate link between structural heterogeneity and evaporation kinetics.
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Affiliation(s)
- Xiao Wang
- School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China
| | - Longlong Wu
- School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China
| | - Geng Wang
- Shanghai Synchrotron Radiation Facility , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201204 , China
| | - Gang Chen
- School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China
- Shanghai Synchrotron Radiation Facility , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201204 , China
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6
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Lokteva I, Walther M, Koof M, Grübel G, Lehmkühler F. In situ small-angle X-ray scattering environment for studying nanocrystal self-assembly upon controlled solvent evaporation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:036103. [PMID: 30927793 DOI: 10.1063/1.5082685] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 02/08/2019] [Indexed: 06/09/2023]
Abstract
We present a sample environment for the investigation of nanoparticle self-assembly from a colloidal solution via controlled solvent evaporation using in situ small-angle X-ray scattering. Nanoparticles form ordered superlattices in the evaporative assembly along the X-ray transparent windows of a three-dimensional sample cell. The special design of the sample cell allows for monitoring the superlattice formation and transformation at different stages of the assembly process during the movement of the evaporation front in real time. The presented sample environment can be used to study the self-organization of a wide range of colloidal particles and other soft materials.
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Affiliation(s)
- I Lokteva
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - M Walther
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - M Koof
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - G Grübel
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - F Lehmkühler
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
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7
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Huang X, Zhu J, Ge B, Deng K, Wu X, Xiao T, Jiang T, Quan Z, Cao YC, Wang Z. Understanding Fe 3O 4 Nanocube Assembly with Reconstruction of a Consistent Superlattice Phase Diagram. J Am Chem Soc 2019; 141:3198-3206. [PMID: 30685973 DOI: 10.1021/jacs.8b13082] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Nanocube (NC) assemblies display complex superlattice behaviors, which require a systematic understanding of their nucleation and growth as well transformation toward construction of a consistent superlattice phase diagram. This work made use of Fe3O4 NCs with controlled environments, and assembled NCs into three-dimensional (3D) superlattices of simple cubic (sc), body-centered cubic (bcc), and face-centered cubic (fcc), acute and obtuse rhombohedral (rh) polymorphs, and 2D superlattices of square and hexagon. Controlled experiments and computations of in situ and static small-angle X-ray scattering (SAXS) as well as electron microscopic imaging revealed that the fcc and bcc polymorphs preferred a primary nucleation at the early stage of NC assembly, which started from the high packing planes of fcc(111) and bcc(110), respectively, in both 3D and 2D cases. Upon continuous growth of superlattice grain (or domain), a confinement stress appeared and distorted fcc and bcc into acute and obtuse rh polymorphs, respectively. The variable magnitudes of competitive interactions between configurational and directional entropy determine the primary superlattice polymorph of either fcc or bcc, while emergent enhancement of confinement effect on enlarged grains attributes to late developed superlattice transformations. Differently, the formation of a sc polymorph requires a strong driving force that either emerges simultaneously or is applied externally so that one easy case of the sc formation can be achieved in 2D thin films. Unlike the traditional Bath deformation pathway that involves an intermediate body-centered tetragonal lattice, the observed superlattice transformations in NC assembly underwent a simple rhombohedral distortion, which was driven by a growth-induced in-plane compressive stress. Establishment of a consistent phase diagram of NC-based superlattices and reconstruction of their assembly pathways provide critical insight and a solid base for controlled design and scalable fabrication of nanocube-based functional materials with desired superlattices and collective properties for real-world applications.
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Affiliation(s)
- Xin Huang
- Cornell High Energy Synchrotron Source , Cornell University , Ithaca , New York 14853 , United States
| | - Jinlong Zhu
- Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100090 , P. R. China
| | - Binghui Ge
- Institute of Physical Science and Information Technology , Anhui University , Hefei , 230601 Anhui , P. R. China
| | - Kerong Deng
- Department of Chemistry , Southern University of Science and Technology (SUSTech) , Shenzhen , Guangdong 518055 , P. R. China
| | - Xiaotong Wu
- Department of Chemistry , Southern University of Science and Technology (SUSTech) , Shenzhen , Guangdong 518055 , P. R. China
| | - Tianyuan Xiao
- Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Tian Jiang
- Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Zewei Quan
- Department of Chemistry , Southern University of Science and Technology (SUSTech) , Shenzhen , Guangdong 518055 , P. R. China
| | - Y Charles Cao
- Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Zhongwu Wang
- Cornell High Energy Synchrotron Source , Cornell University , Ithaca , New York 14853 , United States
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8
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Montanarella F, Geuchies JJ, Dasgupta T, Prins PT, van Overbeek C, Dattani R, Baesjou P, Dijkstra M, Petukhov AV, van Blaaderen A, Vanmaekelbergh D. Crystallization of Nanocrystals in Spherical Confinement Probed by in Situ X-ray Scattering. NANO LETTERS 2018; 18:3675-3681. [PMID: 29781269 PMCID: PMC6002780 DOI: 10.1021/acs.nanolett.8b00809] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 04/25/2018] [Indexed: 05/20/2023]
Abstract
We studied the formation of supraparticles from nanocrystals confined in slowly evaporating oil droplets in an oil-in-water emulsion. The nanocrystals consist of an FeO core, a CoFe2O4 shell, and oleate capping ligands, with an overall diameter of 12.5 nm. We performed in situ small- and wide-angle X-ray scattering experiments during the entire period of solvent evaporation and colloidal crystallization. We observed a slow increase in the volume fraction of nanocrystals inside the oil droplets up to 20%, at which a sudden crystallization occurs. Our computer simulations show that crystallization at such a low volume fraction is only possible if attractive interactions between colloidal nanocrystals are taken into account in the model as well. The spherical supraparticles have a diameter of about 700 nm and consist of a few crystalline face-centered cubic domains. Nanocrystal supraparticles bear importance for magnetic and optoelectronic applications, such as color tunable biolabels, color tunable phosphors in LEDs, and miniaturized lasers.
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Affiliation(s)
| | | | | | | | | | - Rajeev Dattani
- ID-02 , ESRF , 71 Rue des Martyrs , 38000 Grenoble , France
| | | | | | - Andrei V Petukhov
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry , Eindhoven University of Technology , P.O. Box 513, 5600 MB , Eindhoven , Netherlands
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9
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Wang Z, Cui H, Sun Z, Roch LM, Goldner AN, Nour HF, Sue ACH, Baldridge KK, Olson MA. Melatonin-directed micellization: a case for tryptophan metabolites and their classical bioisosteres as templates for the self-assembly of bipyridinium-based supramolecular amphiphiles in water. SOFT MATTER 2018; 14:2893-2905. [PMID: 29589034 DOI: 10.1039/c8sm00136g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The bulk solution properties of amphiphilic formulations are derivative of their self-assembly into higher ordered supramolecular assemblies known as micelles and of their ordering at the air-water interface. Exerting control over the surface-active properties of amphiphiles and their propensity to aggregate in pure water is most often fine-tuned by covalent modification of their molecular structure. Nevertheless structural constraints which limit the performance of amphiphiles do emerge when trying to develop more sophisticated systems which undergo for example, shape-defined controlled assembly and/or respond to external stimuli. In this regard, the template-modulated assembly of the so-called "supramolecular amphiphiles" continues to make progress ordering molecules that otherwise have very little to no driving force to aggregate in a prescribed manner in aqueous solutions. Herein we describe the template-modulated micellization and ordering at the air-water interface of bipyridinium-based supramolecular amphiphiles triggered by host-guest interactions with high specificity for the neurotransmitter melatonin over its biosynthetic synthon l-tryptophan and the thermodynamic parameters governing the template-modulated micellization process. When bound to the bipyridinium units of micellized surfactant molecules, melatonin effectively serves as "molecular glue" capable of lowering the CMC by 52% as compared to untemplated solutions. Analysis of this system suggests that a hallmark of donor-acceptor template-modulated micellization in water is a strong positively correlated temperature dependence of the CMC and the absence of a U-shaped CMC-temperature curve. Our findings make a case for the incorporation of l-tryptophan-based metabolites and their classical synthetic pharmaceutical bioisosteres as potential targets/components of donor-acceptor CT-based supramolecular amphiphile systems/materials operating in water.
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Affiliation(s)
- Zhenzhen Wang
- Health Sciences Platform, Tianjin University, Building 24, Tianjin 300072, China.
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10
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Moon CW, Park J, Hong SP, Sohn W, Andoshe DM, Shokouhimehr M, Jang HW. Decoration of metal oxide surface with {111} form Au nanoparticles using PEGylation. RSC Adv 2018; 8:18442-18450. [PMID: 35541097 PMCID: PMC9080519 DOI: 10.1039/c8ra03523g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 05/04/2018] [Indexed: 11/26/2022] Open
Abstract
The benefit of introducing gold nanoparticles is due to the plasmon relaxation process. The plasmon decay induces various phenomena such as near-field enhancement, hot electron injection, and resonance energy transfer. Shape-controlled octahedral gold nanoparticles can maximize the efficiency of these processes. For practical purposes, a high-coverage decoration method, comparable to physical vapor deposition on a metal oxide semiconductor nanostructure, is indispensable. However, the ligand exchange reaction to attach octahedral gold nanoparticles is limited in aqueous solution due to the inactivity of the gold (111) surface as a result of a densely-packed cetyltrimethylammonium bilayer structure. Herein, we report a controllable high-coverage surface decoration method of octahedral gold nanoparticles on the targeted semiconductor nanostructures via phase transfer by an organic medium with thiolated-polyethylene glycol. Our results deliver an innovative platform for future plasmonic gold nanoparticle applications. Phase transfer in the ethanol-dichloromethane medium extinguished the limitation of the ligand exchange reaction on the gold (111) surface. High-coverage octahedral Au NP decoration on metal oxide semiconductors is achieved by the process.![]()
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Affiliation(s)
- Cheon Woo Moon
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Jongseong Park
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Seung-Pyo Hong
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Woonbae Sohn
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Dinsefa Mensur Andoshe
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Mohammadreza Shokouhimehr
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering
- Research Institute of Advanced Materials
- Seoul National University
- Seoul 08826
- Republic of Korea
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Guillaussier A, Yu Y, Voggu VR, Aigner W, Cabezas CS, Houck DW, Shah T, Smilgies DM, Pereira RN, Stutzmann M, Korgel BA. Silicon Nanocrystal Superlattice Nucleation and Growth. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13068-13076. [PMID: 29058436 DOI: 10.1021/acs.langmuir.7b02710] [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
Colloidal dodecene-passivated silicon (Si) nanocrystals were dispersed in hexane or chloroform and deposited onto substrates as face-centered cubic superlattices by slowly evaporating the solvent. The uniformity of the nanocrystals enables extended order; however, the solvent and the evaporation protocol significantly influence the self-assembly process, determining the morphology of the films, the extent of order, and the superlattice orientation on the substrate. Chloroform yielded superlattices with step-flow growth morphologies and (111)SL, (100)SL, and (110)SL orientations. Hexane led to mostly island morphologies when evaporated at room temperature with exclusively (111)SL orientations. Higher evaporation temperatures led to more extensive step-flow deposition. A model for the surface diffusion of nanocrystals adsorbed on the superlattice surface is developed.
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Affiliation(s)
- Adrien Guillaussier
- McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712-1062, United States
| | - Yixuan Yu
- 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
| | - Willi Aigner
- Technische Universität München, Walter Schottky Institut , Am Coulombwall 4, 85748 Garching bei München, Germany
| | - Camila Saez Cabezas
- 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
| | - Tushti Shah
- 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
| | - Rui N Pereira
- Technische Universität München, Walter Schottky Institut , Am Coulombwall 4, 85748 Garching bei München, Germany
- Institute for Nanostructures, Nanomodelling and Nanofabrication, Department of Physics, University of Aveiro , 3810-193 Aveiro, Portugal
| | - Martin Stutzmann
- Technische Universität München, Walter Schottky Institut , Am Coulombwall 4, 85748 Garching bei München, Germany
| | - 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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12
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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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