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Gwak N, Shin S, Yoo H, Seo GW, Kim S, Jang H, Lee M, Park TH, Kim BJ, Lim J, Kim SY, Kim S, Hwang GW, Oh N. Highly Luminescent Shell-Less Indium Phosphide Quantum Dots Enabled by Atomistically Tailored Surface States. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2404480. [PMID: 39016602 DOI: 10.1002/adma.202404480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 07/08/2024] [Indexed: 07/18/2024]
Abstract
Contrary to the prevailing notion that shell structures arise from the intricate chemistry and surface defects of InP quantum dots (QDs), an innovative strategy that remarkably enhances the luminescence efficiency of core-only InP QDs to over 90% is introduced. This paradigm shift is achieved through the concurrent utilization of group 2 and 3 metal-derived ligands, providing an effective remedy for surface defects and facilitating charge recombination. Specifically, a combination of Zn carboxylate and Ga chloride is employed to address the undercoordination issues associated with In and P atoms, leading to the alleviation of in-gap trap states. The intricate interplay and proportional ratio between Ga- and Zn-containing ligands play pivotal roles in attaining record-high luminescence efficiency in core-only InP QDs, as successfully demonstrated across various sizes and color emissions. Moreover, the fabrication of electroluminescent devices relying solely on InP core emission opens a new direction in optoelectronics, demonstrating the potential of the approach not only in optoelectronic applications but also in catalysis or energy conversion by charge transfer.
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Affiliation(s)
- Namyoung Gwak
- Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Seungki Shin
- Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Hyeri Yoo
- Center for Semiconductor Technology, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Gyeong Won Seo
- Center for Semiconductor Technology, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Seongchan Kim
- Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Hyunwoo Jang
- Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Minwoo Lee
- Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Tae Hwan Park
- Center for Semiconductor Technology, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Byong Jae Kim
- Department of Energy Science, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
- SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
- Department of Future Energy Engineering (DFEE), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
| | - Jaehoon Lim
- Department of Energy Science, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
- SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
- Department of Future Energy Engineering (DFEE), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
| | - Soo Young Kim
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Sangtae Kim
- Department of Nuclear Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Gyu Weon Hwang
- Center for Semiconductor Technology, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Nuri Oh
- Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
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2
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Liu J, Song K, Zheng X, Yin J, Yao KX, Chen C, Yang H, Hedhili MN, Zhang W, Han P, Mohammed OF, Han Y, Bakr OM. Cyanamide Passivation Enables Robust Elemental Imaging of Metal Halide Perovskites at Atomic Resolution. J Phys Chem Lett 2021; 12:10402-10409. [PMID: 34672588 DOI: 10.1021/acs.jpclett.1c02830] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Lead halide perovskites (LHPs) have attracted a tremendous amount of attention because of their applications in solar cells, lighting, and optoelectronics. However, the atomistic principles underlying their decomposition processes remain in large part obscure, likely due to the lack of precise information about their local structures and composition along regions with dimensions on the angstrom scale, such as crystal interfaces. Aberration-corrected scanning transmission electron microscopy combined with X-ray energy dispersive spectroscopy (EDS) is an ideal tool, in principle, for probing such information. However, atomic-resolution EDS has not been achieved for LHPs because of their instability under electron-beam irradiation. We report the fabrication of CsPbBr3 nanoplates with high beam stability through an interface-assisted regrowth strategy using cyanamide. The ultrahigh stability of the nanoplates primarily stems from two contributions: defect-healing self-assembly/regrowth processes and surface modulation by strong electron-withdrawing cyanamide molecules. The ultrahigh stability of as-prepared CsPbBr3 nanoplates enabled atomic-resolution EDS elemental mapping, which revealed atomically and elementally resolved details of the LHP nanostructures at an unprecedented level. While improving the stability of LHPs is critical for device applications, this work illustrates how improving the beam stability of LHPs is essential for addressing fundamental questions on structure-property relations in LHPs.
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Affiliation(s)
- Jiakai Liu
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Kepeng Song
- KAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
- Suzhou Research Institute, Shandong University, Suzhou 215123, China
| | - Xiaopeng Zheng
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Jun Yin
- KAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Ke Xin Yao
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
| | - Cailing Chen
- KAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Haoze Yang
- KAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mohamed Nejib Hedhili
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Wang Zhang
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Peigang Han
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China
| | - Omar F Mohammed
- KAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Yu Han
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
- KAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Osman M Bakr
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
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3
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Kim D, Lee DC. Surface Ligands as Permeation Barrier in the Growth and Assembly of Anisotropic Semiconductor Nanocrystals. J Phys Chem Lett 2020; 11:2647-2657. [PMID: 32175742 DOI: 10.1021/acs.jpclett.9b03052] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Because of the large surface-to-volume ratio of colloidal nanocrystals (NCs), surfactant molecules grafted at the NC surface play an important role in NC growth, interparticle interaction, processing, and application. For this reason, much progress has been made in understanding the surface chemistry of NCs along with the organic ligand shell, particularly in terms of grafted polar groups. However, most explanations of aliphatic counterparts are based on spherical NCs that usually have a dilute ligand layer. In anisotropic NCs such as nanorods and nanoplatelets, the linearly extended dimension results in a high-density aliphatic layer on the NC surface. Unlike spherical NCs, the compact organic shell could serve as a permeation membrane, effectively impeding a penetration of foreign molecules toward the NC surface. In this Perspective, we highlight the effects of ligand configuration on the properties of anisotropic NCs by exploring morphologies, assembled superstructures, and surface reaction of anisotropic NCs.
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Affiliation(s)
- Dahin Kim
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Doh C Lee
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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4
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Wang S, Wang Z, Tang N, Liu C, He S, Liu B, Qu H, Duan X, Pang W, Wang Y. Hierarchical assembly of gold nanorod stripe patterns for sensing and cells alignment. NANOTECHNOLOGY 2019; 30:175302. [PMID: 30634179 DOI: 10.1088/1361-6528/aafddd] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hierarchical assemblies of nanomaterial superstructures with controlled orientation affords a multitude of novel properties of plasmonics and broad applications. Yet constructing multi-functional superstructures with nanoparticles positioned in desired locations remains challenging. Herein, gold nanorods (GNRs) assembled in stripe patterns with controlled orientation and structures in millimeter scale for versatile application have been achieved. Applications of patterned GNRs in sensing enhancement and engineering mammalian cells alignment are investigated experimentally. The performance of patterned GNRs in surface enhanced Raman scattering (SERS) and electrical sensing are found in orientational dependence. The SERS signals of vertically arranged GNR arrays exhibit double the folder intensity than those horizontally arranged. In contrast, the horizontally arranged GNRs exhibit twice as much electrical conductivity. The system is further explored to pattern mammalian cells. For the first time, we reveal the nanostructured topography of GNR confined cells to a specific region, and direct the adhesion and extension of living cells, which opens up broad applications in tissue engineering and biosensing.
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Affiliation(s)
- Shuang Wang
- State Key Laboratory of Precision Measuring Technology & Instruments, School of Precision Instruments and Optoelectronics Engineering, Nanchang Institute for Microtechnology, Tianjin University, 300072, People's Republic of China
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5
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Kim D, Bae WK, Kim SH, Lee DC. Depletion-Mediated Interfacial Assembly of Semiconductor Nanorods. NANO LETTERS 2019; 19:963-970. [PMID: 30681871 DOI: 10.1021/acs.nanolett.8b04198] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Electronic devices comprised of nanocrystal (NC) thin film are projected to demonstrate enhanced figure of merit if NC building blocks self-assemble into highly uniform, 2-dimensional (2-D) superstructures with long-range order. Despite intensive research efforts and remarkable progress, long-range assembly of colloidal anisotropic NCs into thin films with orientational and positional order has remained to be addressed. One of the most promising approaches is to dissolve excess free molecules into NC solution, which has enabled the formation of NC monolayers with exceptional quality at air/solution interface. Nevertheless, the assembly mechanism and the role of free molecules have not been comprehensively elucidated, restricting the use of the approach. Here, we find that the interfacial assembly of CdSe/CdS core/shell nanorods (NRs) results in various ordered structures in the presence of free oleic acid molecules. The structures include a bundle of standing NRs, a belt of multilayered lying NRs, and a monolayer smectic phase, obtained by simple change in density of surface ligands on the NRs. Experimental observation and theoretical calculation reveal that the assembly is initiated at the air/solution interface due to the preferential depletion attraction of NRs to the interface. However, subsequent growth is significantly altered depending on the ligand density that determines the relative magnitude of interface-NR depletion attraction to inter-NR attraction. Highly ordered structures of NRs, especially for the monolayer smectic phase, are promising as a polarized light-emitting layer for thin-film optical devices. In addition, our findings on the depletion-mediated NR assembly provide important and universal design criteria for 2-D structuring of NCs with diverse geometries and compositions.
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Affiliation(s)
- Dahin Kim
- Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST Institute for the NanoCentury , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Korea
| | - Wan Ki Bae
- Sungkyunkwan Advanced Institue of Nano Technology , Sungkyunkwan University , Suwon , Gyeonggi-do 16419 , Korea
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST Institute for the NanoCentury , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Korea
| | - Doh C Lee
- Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST Institute for the NanoCentury , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Korea
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6
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Ghosh S, Manna L. The Many "Facets" of Halide Ions in the Chemistry of Colloidal Inorganic Nanocrystals. Chem Rev 2018; 118:7804-7864. [PMID: 30062881 PMCID: PMC6107855 DOI: 10.1021/acs.chemrev.8b00158] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Indexed: 12/11/2022]
Abstract
Over the years, scientists have identified various synthetic "handles" while developing wet chemical protocols for achieving a high level of shape and compositional complexity in colloidal nanomaterials. Halide ions have emerged as one such handle which serve as important surface active species that regulate nanocrystal (NC) growth and concomitant physicochemical properties. Halide ions affect the NC growth kinetics through several means, including selective binding on crystal facets, complexation with the precursors, and oxidative etching. On the other hand, their presence on the surfaces of semiconducting NCs stimulates interesting changes in the intrinsic electronic structure and interparticle communication in the NC solids eventually assembled from them. Then again, halide ions also induce optoelectronic tunability in NCs where they form part of the core, through sheer composition variation. In this review, we describe these roles of halide ions in the growth of nanostructures and the physical changes introduced by them and thereafter demonstrate the commonality of these effects across different classes of nanomaterials.
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Affiliation(s)
- Sandeep Ghosh
- McKetta
Department of Chemical Engineering, The
University of Texas at Austin, Austin, Texas 78712-1589, United States
| | - Liberato Manna
- Department
of Nanochemistry, Istituto Italiano di Tecnologia
(IIT), via Morego 30, I-16163 Genova, Italy
- Kavli Institute
of Nanoscience and Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
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7
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Kim D, Lee YK, Lee D, Kim WD, Bae WK, Lee DC. Colloidal Dual-Diameter and Core-Position-Controlled Core/Shell Cadmium Chalcogenide Nanorods. ACS NANO 2017; 11:12461-12472. [PMID: 29131591 DOI: 10.1021/acsnano.7b06542] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
To capitalize on shape- and structure-dependent properties of semiconductor nanorods (NRs), high-precision control and exquisite design of their growth are desired. Cadmium chalcogenide (CdE; E = S or Se) NRs are the most studied class of such, whose growth exhibits axial anisotropy, i.e., different growth rates along the opposite directions of {0001} planes. However, the mechanism behind asymmetric axial growth of NRs remains unclear because of the difficulty in instant analysis of growth surfaces. Here, we design colloidal dual-diameter semiconductor NRs (DDNRs) under the quantum confinement regime, which have two sections along the long axis with different diameters. The segmentation of the DDNRs allows rigorous assessment of the kinetics of NR growth at a molecular level. The reactivity of a terminal facet passivated by an organic ligand is governed by monomer diffusivity through the surface ligand monolayer. Therefore, the growth rate in two polar directions can be finely tuned by controlling the strength of ligand-ligand attraction at end surfaces. Building on these findings, we report the synthesis of single-diameter CdSe/CdS core/shell NRs with CdSe cores of controllable position, which reveals a strong structure-optical polarization relationship. The understanding of the NR growth mechanism with controllable anisotropy will serve as a cornerstone for the exquisite design of more complex anisotropic nanostructures.
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Affiliation(s)
- Dahin Kim
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Young Kuk Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT) , Daejeon 34114, Korea
| | - Dongkyu Lee
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Whi Dong Kim
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Wan Ki Bae
- Photoelectronic Hybrids Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Korea
| | - Doh C Lee
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
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8
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Taniguchi Y, Sazali MAB, Kobayashi Y, Arai N, Kawai T, Nakashima T. Programmed Self-Assembly of Branched Nanocrystals with an Amphiphilic Surface Pattern. ACS NANO 2017; 11:9312-9320. [PMID: 28872823 DOI: 10.1021/acsnano.7b04719] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Site-selective surface modification on the shape-controlled nanocrystals is a key approach in the programmed self-assembly of inorganic colloidal materials. This study demonstrates a simple methodology to gain self-assemblies of semiconductor nanocrystals with branched shapes through tip-to-tip attachment. Short-chained water-soluble cationic thiols are employed as a surface ligand for CdSe tetrapods and CdSe/CdS core/shell octapods. Because of the less affinity of arm-tip to the surface ligands compared to the arm-side wall, the tip-surface becomes uncapped to give a hydrophobic nature, affording an amphiphilic surface pattern. The amphiphilic tetrapods aggregated into porous agglomerates through tip-to-tip connection in water, while they afforded a hexagonally arranged Kagome-like two-dimensional (2D) assembly by the simple casting of aqueous dispersion with the aid of a convective self-assembly mechanism. A 2D net-like assembly was similarly obtained from amphiphilic octapods. A dissipative particle dynamics simulation using a planar tripod model with an amphiphilic surface pattern reproduced the formation of the Kagome-like assembly in a 2D confined space, demonstrating that the lateral diffusion of nanoparticles and the firm contacts between the hydrophobic tips play crucial roles in the self-assembly.
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Affiliation(s)
- Yuki Taniguchi
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST) , Ikoma, Nara 630-0192, Japan
| | | | - Yusei Kobayashi
- Department of Mechanical Engineering, Kindai Unversity , Higashiosaka, Osaka 577-8502, Japan
| | - Noriyoshi Arai
- Department of Mechanical Engineering, Kindai Unversity , Higashiosaka, Osaka 577-8502, Japan
| | - Tsuyoshi Kawai
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST) , Ikoma, Nara 630-0192, Japan
| | - Takuya Nakashima
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST) , Ikoma, Nara 630-0192, Japan
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9
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Ong X, Gupta S, Wu WY, Chakrabortty S, Chan Y. Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures. J Vis Exp 2017. [PMID: 28829411 DOI: 10.3791/56009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Here, we describe a protocol that allows for shape-anisotropic cadmium chalcogenide nanocrystals (NCs), such as nanorods (NRs) and tetrapods (TPs), to be covalently and site-specifically linked via their end facets, resulting in polymer-like linear or branched chains. The linking procedure begins with a cation-exchange process in which the end facets of the cadmium chalcogenide NCs are first converted to silver chalcogenide. This is followed by the selective removal of ligands at their surface. This results in cadmium chalcogenide NCs with highly reactive silver chalcogenide end facets that spontaneously fuse upon contact with each other, thereby establishing an interparticle facet-to-facet attachment. Through the judicious choice of precursor concentrations, an extensive network of linked NCs can be produced. Structural characterization of the linked NCs is carried out via low- and high-resolution transmission electron microscopy (TEM), as well as energy-dispersive X-ray spectroscopy, which confirm the presence of silver chalcogenide domains between chains of cadmium chalcogenide NCs.
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Affiliation(s)
- Xuanwei Ong
- Department of Chemistry, National University of Singapore
| | - Shashank Gupta
- Department of Chemistry, National University of Singapore
| | - Wen-Ya Wu
- Materials Processing and Characterisation Department, A*STAR, Institute of Materials Research and Engineering
| | | | - Yinthai Chan
- Department of Chemistry, National University of Singapore; Ceramics Department, A*STAR, Institute of Materials Research and Engineering;
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10
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Wang PP, Yu SJ, Ouyang M. Assembled Suprastructures of Inorganic Chiral Nanocrystals and Hierarchical Chirality. J Am Chem Soc 2017; 139:6070-6073. [DOI: 10.1021/jacs.7b02523] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Peng-peng Wang
- Department
of Physics and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, United States
| | - Shang-Jie Yu
- Department
of Physics and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, United States
- Department
of Electrical and Computer Engineering, University of Maryland, College
Park, Maryland 20742, United States
| | - Min Ouyang
- Department
of Physics and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, United States
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11
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Anjali TG, Basavaraj MG. Shape-Induced Deformation, Capillary Bridging, and Self-Assembly of Cuboids at the Fluid-Fluid Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:791-801. [PMID: 28036182 DOI: 10.1021/acs.langmuir.6b03866] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The controlled assembly of anisotropic particles through shape-induced interface deformations is shown to be a potential route for the fabrication of novel functional materials. In this article, the shape-induced interface deformation, capillary bridging, and directed self-assembly of cuboidal-shaped hematite particles at fluid-fluid interfaces are reported. The multipolar nature of the interface distortions is directly visualized using high-resolution scanning electron microscopy and 3D optical surface profiling. The nature of the interface deformations around cuboidal particles vary from monopolar to octupolar types depending on their orientation and position with respect to the interface. The deformations are of either hexapolar or octupolar type in the face-up orientation, quadrupolar or monopolar type in the edge-up orientation, and monopolar type in the vertex-up orientation. The particles adsorbed at the interface interact through the interface deformations, forming capillary bridges that lead to isolated assemblies of two or more particles. The arrangement of particles in any assembly is such that the condition for capillary attraction is satisfied, that is, in accordance with predictions based on the nature of interface deformations. At sufficient particle concentrations, these isolated structures interact to form a percolating network of cuboids. Furthermore, the difference in the nature of the assembly structures formed at the air-water interface and in the bulk water phase indicates that the interfacial assembly of these particles is controlled by the capillary interactions.
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Affiliation(s)
- Thriveni G Anjali
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras , Chennai 600 036, India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras , Chennai 600 036, India
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12
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Song J, Niu G, Chen X. Amphiphilic-Polymer-Guided Plasmonic Assemblies and Their Biomedical Applications. Bioconjug Chem 2016; 28:105-114. [PMID: 28095685 DOI: 10.1021/acs.bioconjchem.6b00521] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Plasmonic nanostructures with unique physical and biological properties have attracted increased attention for potential biomedical applications. Polymers grafted on metal nanoparticle surface can be used as assembly regulating molecules to guide nanoparticles organize into ordered or hierarchical structures in solution, within condensed phases, or at interfaces. In this Topical Review, we will highlight recent efforts on self-assembly of gold nanoparticles coated with polymer brushes. How and what kind of polymer graft can be used to adjust nanoparticle interactions, to dictate interparticle orientation, and to determine assembled nanostructures will be discussed. Furthermore, the Topical Review will shed light on the physicochemical properties, including self-assembly behavior and kinetics, tunable localized surface plasmon resonance effect, enhanced surface enhanced Raman scattering, and other optical and thermal properties. The potential of self-assembled nanostructures for applications in different fields, especially in biomedicine, will also be elaborated.
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Affiliation(s)
- Jibin Song
- Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health , Bethesda, Maryland 20892, United States
| | - Gang Niu
- Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health , Bethesda, Maryland 20892, United States
| | - Xiaoyuan Chen
- Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health , Bethesda, Maryland 20892, United States
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13
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Giner-Casares JJ, Reguera J. Directed self-assembly of inorganic nanoparticles at air/liquid interfaces. NANOSCALE 2016; 8:16589-16595. [PMID: 27722594 DOI: 10.1039/c6nr05054a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Inorganic nanoparticles (NPs) appear as the forefront functional structure in nanotechnology. The preparation of functional materials based on inorganic NPs requires their assembly onto well-defined structures. Within this context, self-assembly at air-liquid interfaces is probably the best candidate for a universal procedure for active materials composed of assembled NPs. The detailed in situ mechanism of the lateral self-assembly and vertical organization of NPs at air-liquid interfaces is still unknown despite its extended use. The most common and promising methods for addressing this open issue are reviewed herein. The self-assembled films can be used in situ or further be transferred to solid substrates as the main constituents of novel functional materials. Plasmonic NPs at interfaces are highly interesting, given the broad range of applications of the plasmonic field, and will be discussed more in detail.
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Affiliation(s)
- Juan J Giner-Casares
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, 14014, Córdoba, Spain.
| | - Javier Reguera
- CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia-San Sebastián, Spain. and Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain and Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), 50018 Aragon, Spain
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14
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Martínez-Ratón Y, González-Pinto M, Velasco E. Biaxial nematic phase stability and demixing behaviour in monolayers of rod-plate mixtures. Phys Chem Chem Phys 2016; 18:24569-81. [PMID: 27539250 DOI: 10.1039/c6cp05022k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We theoretically study the phase behaviour of monolayers of hard rod-plate mixtures using a fundamental-measure density functional in the restricted-orientation (Zwanzig) approximation. Particles can rotate in 3D but their centres of mass are constrained to be on a flat surface. In addition, we consider both species to be subject to an attractive potential proportional to the particle contact area on the surface and with adsorption strengths that depend on the species type. Particles have board-like shape, with sizes chosen using a symmetry criterion: same volume and same aspect ratio κ. Phase diagrams were calculated for κ = 10, 20 and 40 and different values of adsorption strengths. For small adsorption strengths the mixtures exhibit a second-order uniaxial nematic-biaxial nematic transition for molar fraction of rods 0 ≤x≲ 0.9. In the uniaxial nematic phase the particle axes of rods and plates are aligned perpendicular and parallel to the monolayer, respectively. At the transition, the orientational symmetry of the plate axes is broken, and they orient parallel to a director lying on the surface. For large and equal adsorption strengths the mixture demixes at low pressures into a uniaxial nematic phase, rich in plates, and a biaxial nematic phase, rich in rods. The demixing transition is located between two tricritical points. Also, at higher pressures and in the plate-rich part of the phase diagram, the system exhibits a strong first-order uniaxial nematic-biaxial nematic phase transition with a large density coexistence gap. When rod adsorption is considerably large while that of plates is small, the transition to the biaxial nematic phase is always of second order, and its region of stability in the phase diagram considerably widens. At very high pressures the mixture can effectively be identified as a two-dimensional mixture of squares and rectangles which again demixes above a certain critical point. We also studied the relative stability of uniform phases with respect to density modulations of smectic, columnar and crystalline symmetry.
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Affiliation(s)
- Yuri Martínez-Ratón
- Grupo Interdisciplinar de Sistemas Complejos (GISC), Departamento de Matemáticas, Escuela Politécnica Superior, Universidad Carlos III de Madrid, Avenida de la Universidad 30, E-28911, Leganés, Madrid, Spain.
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15
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Ariga K, Malgras V, Ji Q, Zakaria MB, Yamauchi Y. Coordination nanoarchitectonics at interfaces between supramolecular and materials chemistry. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.01.015] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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16
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Nakamura K, Nakagawa Y, Kageyama H, Oaki Y, Imai H. Orientation-Selective Alignments of Hydroxyapatite Nanoblocks through Epitaxial Attachment in a and c Directions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4066-4070. [PMID: 27078749 DOI: 10.1021/acs.langmuir.6b00732] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanometric rods of hydroxyapatite (HA) were aligned in selective crystallographic directions by the alternation of adsorbing molecules. The side and end faces of HA nanorods elongated in the c direction were covered with oleic acid (OA) and tetraoctylammonium (TOA) ions, respectively. Alignment in the c direction of the OA-modified nanorods was produced through epitaxial attachment of the bare end faces in toluene because the side faces were hydrophobized with the negatively charged modifier. Another alignment-in the a direction of the TOA-modified HA nanorods-was obtained through the epitaxial attachment of the bare side faces in ethanol due to stabilization of the end faces with the positively charged modifier. Controlled alignments of the nanorods in the a and c directions were achieved through oriented attachment with the selective coverage of the c and a faces with the specific modifiers.
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Affiliation(s)
- Kazuki Nakamura
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yoshitaka Nakagawa
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Hiroyuki Kageyama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yuya Oaki
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Hiroaki Imai
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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17
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Xiong M, Jin X, Ye J. Strong plasmon coupling in self-assembled superparamagnetic nanoshell chains. NANOSCALE 2016; 8:4991-4999. [PMID: 26864389 DOI: 10.1039/c5nr09101b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Construction of ordered patterns of plasmonic nanoparticles is greatly important for nanophotonics relevant applications. We have reported a facile and low-cost magnetic field induced self-assembly approach to construct plasmonic superparamagnetic nanoshell (SN) chains up to several hundred micrometers in a few seconds in a large area without templates or other assistance processes. Experimental and theoretical investigations of the near- and far-field optical properties indicate that the super- and sub-radiant modes of the SN chains continuously redshift with the increase of SN number and the Fano resonance emerges in the infinite double- and triple-line SN chains. Strong plasmon coupling effects in the SN chains result in great electric field enhancements at visible and infrared wavelengths, which indicates that these chain structures potentially can be used as a common substrate for both surface enhanced Raman scattering (SERS) and surface-enhanced infrared absorption (SEIRA) application. This fabrication method also offers a general strategy alternative to top-down processing that enables the construction of nanostructures for metamaterials, electromagnetic energy transport, and optical waveguide.
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Affiliation(s)
- Min Xiong
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, China.
| | - Xiulong Jin
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, China.
| | - Jian Ye
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, China.
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18
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Taniguchi Y, Takishita T, Kawai T, Nakashima T. End-to-End Self-Assembly of Semiconductor Nanorods in Water by Using an Amphiphilic Surface Design. Angew Chem Int Ed Engl 2016; 55:2083-6. [PMID: 26836341 DOI: 10.1002/anie.201509833] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Indexed: 12/19/2022]
Abstract
One-dimensional (1D) self-assemblies of nanocrystals are of interest because of their vectorial and polymer-like dynamic properties. Herein, we report a simple method to prepare elongated assemblies of semiconductor nanorods (NRs) through end-to-end self-assembly. Short-chained water-soluble thiols were employed as surface ligands for CdSe NRs having a wurtzite crystal structure. The site-specific capping of NRs with these ligands rendered the surface of the NRs amphiphilic. The amphiphilic CdSe NRs self-assembled to form elongated wires by end-to-end attachment driven by the hydrophobic effect operating between uncapped NR ends. The end-to-end assembly technique was further applied to CdS NRs and CdSe tetrapods (TPs) with a wurtzite structure.
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Affiliation(s)
- Yuki Taniguchi
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Takao Takishita
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Tsuyoshi Kawai
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Takuya Nakashima
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan.
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19
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Taniguchi Y, Takishita T, Kawai T, Nakashima T. End-to-End Self-Assembly of Semiconductor Nanorods in Water by Using an Amphiphilic Surface Design. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201509833] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yuki Taniguchi
- Graduate School of Materials Science; Nara Institute of Science and Technology (NAIST); 8916-5 Takayama, Ikoma Nara 630-0192 Japan
| | - Takao Takishita
- Graduate School of Materials Science; Nara Institute of Science and Technology (NAIST); 8916-5 Takayama, Ikoma Nara 630-0192 Japan
| | - Tsuyoshi Kawai
- Graduate School of Materials Science; Nara Institute of Science and Technology (NAIST); 8916-5 Takayama, Ikoma Nara 630-0192 Japan
| | - Takuya Nakashima
- Graduate School of Materials Science; Nara Institute of Science and Technology (NAIST); 8916-5 Takayama, Ikoma Nara 630-0192 Japan
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20
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Nakagawa Y, Kageyama H, Oaki Y, Imai H. Orientation-selective alignments of nanoblocks in a and c directions of a tetragonal system through molecularly mediated manipulation. Chem Commun (Camb) 2016; 52:5597-600. [DOI: 10.1039/c5cc10644c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective 1D alignments of nanometric Mn3O4 cuboids in the a and c directions were achieved on the basis of the hydrophobic–hydrophilic interaction between a single dispersion medium and the specific crystal faces.
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Affiliation(s)
- Yoshitaka Nakagawa
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University
- Yokohama 223-8522
- Japan
| | - Hiroyuki Kageyama
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University
- Yokohama 223-8522
- Japan
| | - Yuya Oaki
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University
- Yokohama 223-8522
- Japan
| | - Hiroaki Imai
- Department of Applied Chemistry
- Faculty of Science and Technology
- Keio University
- Yokohama 223-8522
- Japan
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21
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Lou F, Ye L, Kong M, Yang Q, Li G, Huang Y. Pickering emulsions stabilized by shape-controlled silica microrods. RSC Adv 2016. [DOI: 10.1039/c6ra00360e] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Silica microrods with varying aspect ratios but similar surface characteristics are synthesized and their potential in preparing stable oil-in-water Pickering emulsions are explored.
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Affiliation(s)
- Fangli Lou
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering of China
- Sichuan University
- Chengdu 610065
- China
| | - Lishaya Ye
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering of China
- Sichuan University
- Chengdu 610065
- China
| | - Miqiu Kong
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering of China
- Sichuan University
- Chengdu 610065
- China
| | - Qi Yang
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering of China
- Sichuan University
- Chengdu 610065
- China
| | - Guangxian Li
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering of China
- Sichuan University
- Chengdu 610065
- China
| | - Yajiang Huang
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering of China
- Sichuan University
- Chengdu 610065
- China
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22
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Xu N, Han J, Zhu Z, Song B, Lu X, Cai Y. Directional supracolloidal self-assembly via dynamic covalent bonds and metal coordination. SOFT MATTER 2015; 11:5546-5553. [PMID: 26068708 DOI: 10.1039/c5sm00546a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An emerging strategy towards the sophistication of supramolecular nanomaterials is the use of supracolloidal self-assembly, in which micelles or colloids are used as building blocks. Binding directionality can produce nanostructures with attractive properties. Herein, we present a new directional supracolloidal self-assembly by virtue of dynamic covalent bonds and metal coordination in water. Conjugation of a ligand precursor to a water-soluble block copolymer through dynamic covalent bonds leads to the dehydration and micellization of the functionalized polymer. Reversible reaction facilitates the permeation of metal ions into core-shell interfaces. Conversely, metal-coordination promotes reaction over the interfaces. Cu(ii)-coordination occurs overwhelmingly inside each isolated micelle. However, Zn(ii)-coordination induced a directional self-assembly whose nanostructures evolve stepwise from nanorods, nanowires, necklaces, and finally to supracolloidal networks scaling-up to several tens of micrometres. Post-reactions of simultaneous dynamic covalent bond conversion and Zn(ii)-coordination over the core-shell interfaces endow these supracolloidal networks with a huge specific surface area for hydrophobic dative metal centres accessible to substrates in water. Water-soluble shells play important roles in directional supracolloidal assembly and in the stabilization of nanostructures. Thus the directional self-assembly provides a versatile platform to produce metallo-hybridized nanomaterials that are promising as enzyme-inspired aqueous catalysts.
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Affiliation(s)
- Na Xu
- The Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
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23
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Xie B, Buehler MJ, Xu Z. Directed self-assembly of end-functionalized nanofibers: from percolated networks to liquid crystal-like phases. NANOTECHNOLOGY 2015; 26:205602. [PMID: 25913165 DOI: 10.1088/0957-4484/26/20/205602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We explore the directed self-assembly (DSA) process of end-functionalized nanofibers (NFs) by performing coarse-grained molecular dynamics simulations. We find that by tuning their interactions, NFs aggregate and self-organize into networks with specific topologies ranging from percolated networks to liquid crystal-like long-chain phases. The underlying mechanism is explained through an analytical model from a minimum energy perspective. In addition to offering microscopic understandings of the DSA process, the findings reported here can also guide robust target-specified design of nanofibrous materials into organized network structures.
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Affiliation(s)
- Bo Xie
- Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, People's Republic of China
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24
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Dugyala VR, Basavaraj MG. Self-assembly of nano-ellipsoids into ordered structures via vertical deposition. RSC Adv 2015. [DOI: 10.1039/c5ra09632d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
By exploiting DLVO interactions, we demonstrate a single step bottom-up approach to self-assemble nano-ellipsoids into three dimensional ordered structures via a vertical deposition technique.
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Affiliation(s)
- Venkateshwar Rao Dugyala
- Polymer Engineering and Colloid Science Lab (PECS Lab)
- Department of Chemical Engineering
- Indian Institute of Technology Madras
- India
| | - Madivala G. Basavaraj
- Polymer Engineering and Colloid Science Lab (PECS Lab)
- Department of Chemical Engineering
- Indian Institute of Technology Madras
- India
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25
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Sung Y, Lim J, Koh JH, Hill LJ, Min BK, Pyun J, Char K. Uniform decoration of Pt nanoparticles on well-defined CdSe tetrapods and the effect of their Pt cluster size on photocatalytic H2generation. CrystEngComm 2015. [DOI: 10.1039/c5ce01502b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Direct decoration of Pt nanoparticles onto CdSe tetrapods with controlled sizes and their photocatalytic H2generation efficiency.
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Affiliation(s)
- Younghun Sung
- The National Creative Research Initiative Center for Intelligent Hybrids
- Seoul National University
- Seoul 08826, Republic of Korea
- The World Class University (WCU) Program of Chemical Convergence for Energy & Environment
- School of Chemical & Biological Engineering
| | - Jaehoon Lim
- Chemistry Division
- Los Alamos National Laboratory
- , USA
| | - Jai Hyun Koh
- Clean Energy Research Center
- Korea Institute of Science and Technology (KIST)
- Seoul 02792, Republic of Korea
| | - Lawrence J. Hill
- Department of Chemistry and Biochemistry
- University of Arizona
- Tucson, USA
| | - Byoung Koun Min
- Clean Energy Research Center
- Korea Institute of Science and Technology (KIST)
- Seoul 02792, Republic of Korea
| | - Jeffrey Pyun
- The World Class University (WCU) Program of Chemical Convergence for Energy & Environment
- School of Chemical & Biological Engineering
- Seoul National University
- Seoul 08826, Republic of Korea
- Department of Chemistry and Biochemistry
| | - Kookheon Char
- The National Creative Research Initiative Center for Intelligent Hybrids
- Seoul National University
- Seoul 08826, Republic of Korea
- The World Class University (WCU) Program of Chemical Convergence for Energy & Environment
- School of Chemical & Biological Engineering
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