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Barcelos DA, Leitao DC, Pereira LCJ, Gonçalves MC. What Is Driving the Growth of Inorganic Glass in Smart Materials and Opto-Electronic Devices? MATERIALS (BASEL, SWITZERLAND) 2021; 14:2926. [PMID: 34072283 PMCID: PMC8198596 DOI: 10.3390/ma14112926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/19/2021] [Accepted: 05/21/2021] [Indexed: 02/06/2023]
Abstract
Inorganic glass is a transparent functional material and one of the few materials that keeps leading innovation. In the last decades, inorganic glass was integrated into opto-electronic devices such as optical fibers, semiconductors, solar cells, transparent photovoltaic devices, or photonic crystals and in smart materials applications such as environmental, pharmaceutical, and medical sensors, reinforcing its influence as an essential material and providing potential growth opportunities for the market. Moreover, inorganic glass is the only material that is 100% recyclable and can incorporate other industrial offscourings and/or residues to be used as raw materials. Over time, inorganic glass experienced an extensive range of fabrication techniques, from traditional melting-quenching (with an immense diversity of protocols) to chemical vapor deposition (CVD), physical vapor deposition (PVD), and wet chemistry routes as sol-gel and solvothermal processes. Additive manufacturing (AM) was recently added to the list. Bulks (3D), thin/thick films (2D), flexible glass (2D), powders (2D), fibers (1D), and nanoparticles (NPs) (0D) are examples of possible inorganic glass architectures able to integrate smart materials and opto-electronic devices, leading to added-value products in a wide range of markets. In this review, selected examples of inorganic glasses in areas such as: (i) magnetic glass materials, (ii) solar cells and transparent photovoltaic devices, (iii) photonic crystal, and (iv) smart materials are presented and discussed.
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Affiliation(s)
- Daniel Alves Barcelos
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
- CQE, Centro de Química Estrutural, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Diana C. Leitao
- INESC Microsistemas e Nanotecnologias, R. Alves Redol 9, 1000-029 Lisboa, Portugal;
- Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Laura C. J. Pereira
- Departamento de Engenharia e Ciências Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2685-066 Bobadela LRS, Portugal;
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2685-066 Bobadela LRS, Portugal
| | - Maria Clara Gonçalves
- Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;
- CQE, Centro de Química Estrutural, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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Xu J, Moon H, Xu J, Lim J, Fischer T, McNally HA, Sintim HO, Lee H. One-Step Large-Scale Nanotexturing of Nonplanar PTFE Surfaces to Induce Bactericidal and Anti-inflammatory Properties. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26893-26904. [PMID: 32437600 PMCID: PMC8176282 DOI: 10.1021/acsami.0c04729] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Here we demonstrate a simple and scalable nanotexturing method for both planar (films) and nonplanar (tubes) polytetrafluoroethylene (PTFE) surfaces using a commercial desktop oxygen plasma etcher. The simple process can generate semiordered nanopillar structures on both tubular and planar samples with high radial and axial uniformity. We found that the resulting surfaces exhibit good in vitro bactericidal and in vivo anti-inflammatory properties. When tested against Staphylococcus aureus, the nanotextured surfaces showed significantly decreased live bacteria coverage and increased dead bacteria coverage, demonstrating significant bactericidal functionality. Moreover, the etched planar PTFE films exhibited better healing and inflammatory responses in the subcutis of C57BL/6 mice over 7 and 21 days, evidenced by a thinner inflammatory band, lower collagen deposition, and decreased macrophage infiltration. Our results suggest the possibility of using this simple process to generate large scale biomimetic nanotextured surfaces with good antibiofouling properties to enhance the functionality of many implantable and other biomedical devices.
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Affiliation(s)
- Jian Xu
- Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Center for Implantable Devices, Purdue University, West Lafayette, Indiana 47907, United States
| | - Haesoo Moon
- Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Center for Implantable Devices, Purdue University, West Lafayette, Indiana 47907, United States
| | - Jinjia Xu
- Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Center for Implantable Devices, Purdue University, West Lafayette, Indiana 47907, United States
| | - Jongcheon Lim
- Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Center for Implantable Devices, Purdue University, West Lafayette, Indiana 47907, United States
| | - Thomas Fischer
- School of Engineering Technology, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Helen A McNally
- School of Engineering Technology, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Herman O Sintim
- Department of Chemistry, Center for Drug Discovery, Purdue Institute of Inflammation, Immunology and Infectious Disease, Purdue University, West Lafayette, Indiana 47907, United States
| | - Hyowon Lee
- Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Center for Implantable Devices, Purdue University, West Lafayette, Indiana 47907, United States
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Chou PC, Lin FP, Hsu HL, Chang CJ, Lu CH, Chen JK. Electrorheological Sensor Encapsulating Microsphere Media for Plague Diagnosis with Rapid Visualization. ACS Sens 2020; 5:665-673. [PMID: 31869212 DOI: 10.1021/acssensors.9b01529] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Plague is a disease infected by an etiological agent, which is transmitted from fleas to a variety of wildlife rodents. Therefore, rapid diagnosis of plague on-site in the field is important. Polystyrene microspheres (SMs) of 2.2 μm diameter were synthesized by emulsion polymerization to adsorb magnetic nanoparticles (FNs), resulting in core-/shell-structured microspheres that generate a significant contrast in relative permittivities between SMs and FNs. Electrorheological displays (EDs) consisting of two indium tin oxide glasses with spacers were constructed to contain core-/shell-structured SM/FN (SM@FN) solutions for observing their transmittance change. The ED encapsulating dispersed SM@FN solution exhibited an opaque state because light was scattered significantly without the application of an alternating electric field (AEF). In the presence of an AEF, the particle chaining behavior results in enhancement of the transmittance of ED. At a specific frequency, the so-called characteristic frequency (Fc), the transmittance reaches a maximum. Fc could be used as an indicator to mark the shell materials. The antibody of Yersinia pestis (ab-Yp) was coated onto the SM@FN as a biosensing medium. The Fc of ab-Yp-modified microspheres shifted from 200 to 750 kHz with antigen coupling of Y. pestis antigen (ag-Yp). In the absence of fluorescence labeling, the large change in ED transmittance could be visualized during the Y. pestis detection. The limit of detection and the limit of quantification were ∼30 and ∼40 ng/μL, respectively, obtained within 30 s according to the highest transmittance of ED under the AEF at 750 kHz. Y. pestis detection was not affected by Escherichia coli and Staphylococcus aureus significantly. Compared with other common immunoassays, including the secondary immunochemical or enzyme-linked steps, this simple electrorheological sensor with high sensitivity and selectivity could be a candidate for on-site plague diagnosis.
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Affiliation(s)
- Pai-Chien Chou
- Department of Thoracic Medicine, Taipei Medical University Hospital, Taipei 110, Taiwan, Republic of China
- Department of Materials and Science Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan, Republic of China
| | - Feng-Ping Lin
- Department of Materials and Science Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan, Republic of China
- Institute of Preventive Medicine, National Defense Medical Center, 161, Sec. 6, Minquan East Road, Neihu Dist., New Taipei City 114, Taiwan, ROC
| | - Hui-Ling Hsu
- Institute of Preventive Medicine, National Defense Medical Center, 161, Sec. 6, Minquan East Road, Neihu Dist., New Taipei City 114, Taiwan, ROC
| | - Chi-Jung Chang
- Department of Chemical Engineering, Feng Chia University, 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan, ROC
| | - Chien-Hsing Lu
- Department of Obstetrics and Gynecology, Taichung Veterans General Hospital, Taichung 40705, Taiwan
- Department of Obstetrics and Gynecology, National Yang-Ming University School of Medicine, Taipei 112, Taiwan
| | - Jem-Kun Chen
- Department of Materials and Science Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan, Republic of China
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Lenardi C, Mayer J, Faraone G, Cardoso J, Marom S, Modi R, Podestà A, Kadkhodazadeh S, Di Vece M. Nanoscale-Induced Formation of Silicide around Gold Nanoparticles Encapsulated in a-Si. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:939-947. [PMID: 31913638 DOI: 10.1021/acs.langmuir.9b02993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Decorating thin-film solar cells with plasmonic nanoparticles is being pursued in order to improve device efficiency through increased scattering and local field enhancement. Gold nanoparticles are particularly interesting due to their chemical inertness and plasmon resonance in the visible range of the spectrum. In this work, gold nanoparticles fabricated by a gas aggregation nanoparticle source and embedded in a-Si (a commercial solar cell material) are studied using X-ray photoelectron spectroscopy, transmission electron microscopy, electron energy-loss spectroscopy, and energy-dispersive X-ray spectroscopy. The formation of gold silicide around the nanoparticles is investigated, as it has important consequences for the optical and electronic properties of the structures. Different from previous studies, in which the silicide formation is observed for gold nanoparticles and thin films grown on top of crystalline silicon or silica, it is found that silicide formation is largely enhanced around the nanoparticles, owing to their increased surface/volume ratio. A detailed gold silicide formation mechanism is presented based on the results, and strategies for optimizing the design of plasmonically enhanced solar cells with gold nanoparticles encapsulated in a-Si are discussed.
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Affiliation(s)
- Cristina Lenardi
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
| | - Justin Mayer
- DTU Nanolab , Technical University of Denmark , Kongens Lyngby DK-2800 , Denmark
| | - Gabriele Faraone
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
| | - Jonathan Cardoso
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
| | - Sarita Marom
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
| | - Ritika Modi
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
| | - Alessandro Podestà
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
| | - Shima Kadkhodazadeh
- DTU Nanolab , Technical University of Denmark , Kongens Lyngby DK-2800 , Denmark
| | - Marcel Di Vece
- Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department "Aldo Pontremoli" , University of Milan , Via Celoria 16 , Milan 20133 , Italy
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Lin FP, Hsu HL, Chang CJ, Lee SC, Chen JK. Surface lattice resonance of line array of poly (glycidyl methacrylate) with CdS quantum dots for label-free biosensing. Colloids Surf B Biointerfaces 2019; 179:199-207. [PMID: 30959232 DOI: 10.1016/j.colsurfb.2019.03.073] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 03/21/2019] [Accepted: 03/31/2019] [Indexed: 11/25/2022]
Abstract
One dimensional plasmonic grating is a kind of resonant electromagnetic wave absorber with a characteristic wavelength. This study focusses on one-dimensional plasmonic grating consisting of poly (glycidyl methacrylate) (PGMA) brushes and CdS quantum dots (CdQDs) fabrication and PGMA chains grafted on a primary substrate in a line array continued by the immobilization of biotin-modified CdQDs. PGMA brush line array (PBLA) of plasmonic grating exhibited an absorptance at 441 nm while at the same time, CdQDs immobilized with PBLA showed characteristic absorbance at 396 nm. The blue-shift from 441 nm matches the absorbance peak of biotin-modified CdQDs resulting in the enhancement of photoluminescence emission of CdQDs. With streptavidin incubation to assemble CdQDs at 50 nM, the significant decrease in grating height resulted in the red-shift of the absorbance peak to 536 nm. Due to the deviation in absorbance, the intensity of the PL emission decreased gradually with the increase in concentration of streptavidin. In addition, our results showed that streptavidin incubation altered the color reflected from the surface due to effective changes in the refractive index of the layer as well. The limit of detection of the grating for streptavidin detection was determined to be 50 nM. Thus, PBLA-CdQD has the potential to act as a highly-sensitive, label-free optical biosensor.
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Affiliation(s)
- Feng-Ping Lin
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Rd., Taipei, 106, Taiwan, ROC; Institute of Preventive Medicine, National Defense Medical Center, 161, Sec. 6, Minquan E. Rd., Neihu Dist., New Taipei City, Taiwan, ROC
| | - Hui-Ling Hsu
- Institute of Preventive Medicine, National Defense Medical Center, 161, Sec. 6, Minquan E. Rd., Neihu Dist., New Taipei City, Taiwan, ROC
| | - Chi-Jung Chang
- Department of Chemical Engineering, Feng Chia University, 100, Wenhwa Road, Seatwen, Taichung, 40724, Taiwan, ROC
| | - Sheng-Chi Lee
- Department of Orthopediac Surgery, Pingtung Branch, Kaohsiung Veterans General Hospital, 1, Anping Lane 1, Zhao Sheng Road, Neibu Township, Pingtung County, Taiwan, ROC.
| | - Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Rd., Taipei, 106, Taiwan, ROC; Applied Research Center for Thin-Film Metallic Glass, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan, ROC.
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Su SK, Lin FP, Huang CF, Lu CH, Chen JK. Coordination between Surface Lattice Resonances of Poly(glycidyl Methacrylate) Line Array and Surface Plasmon Resonances of CdS Quantum on Silicon Surface. Polymers (Basel) 2019; 11:E558. [PMID: 30960542 PMCID: PMC6473753 DOI: 10.3390/polym11030558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 03/08/2019] [Accepted: 03/19/2019] [Indexed: 11/16/2022] Open
Abstract
In this work, a unique hybrid system is proposed for one-dimensional gratings comprising of poly(glycidyl methacrylate) (PGMA) brushes and CdS quantum dots (CQDs). Generally, the emission of QDs is too weak to be observed in a dry state. Plasmonic resonances of the grating structures can be used to enhance the light emission or absorption of CQDs. The interaction between PGMA plasmonic nanostructures and inorganic CQDs plays a crucial role in engineering the light harvest, notably for optoelectronic applications. Extinction measurements of the hybrid system consisting of a PGMA grating and CQDs are reported. We designed one-dimensional gratings with various resolutions to tune the absorptance peaks of grating. PGMA grating grafted from a 1.5 µm resolution of trench arrays of photoresist exhibited absorptance peak at 395 nm, close to the absorption peak of CQDs, resulting in the photoluminescence enhancement of CQDs on the grating due to high charge carriers' recombination rate. Generally, the emission of quantum dots occurs under irradiation at characteristic wavelengths. Immobilizing QDs on the grating facilitates the emission of QDs under irradiation of full-wavelength light. Furthermore, the PGMA gratings with CQDs were immersed in various solvents to change the geometries resulting the shift of absorptance peak of grating. The proposed method could be applied for sensing the nature of the surrounding media and vice versa, as well as for various media of solvents.
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Affiliation(s)
- Shuenn-Kung Su
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
| | - Feng-Ping Lin
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
| | - Chih-Feng Huang
- Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
| | - Chien-Hsing Lu
- Department of Obstetrics and Gynecology, Taichung Veterans General Hospital, Taichung 40705, Taiwan.
- Ph. D. Program in Translational Medicine, and Rong Hsing Research Center for Translational Medicine, National Chung Hsing University, Taichung 40227, Taiwan.
| | - Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
- Taiwan Building Technology Center, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
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Abstract
Intriguing ferromagnetic behaviour has been reported in gold thin films — a diamagnetic material in the bulk — wherein large magnetic moments and uncommon anisotropy are often hallmark features. The tuning of the electronic and magnetic properties by the presence of molecular self-assembled monolayers has been proposed. In this work, we present the study of the magnetism of a wide collection of alkanethiols of differing chain lengths coated on Au. We find no or only very weak magnetism, casting doubt on the universality and reproducibility of this phenomenon.
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Affiliation(s)
- Pengcheng Dong
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
| | - Simon Trudel
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
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Wang D, Zhao A, Li L, He Q, Guo H, Sun H, Gao Q. Bioinspired ribbed hair arrays with robust superhydrophobicity fabricated by micro/nanosphere lithography and plasma etching. RSC Adv 2015. [DOI: 10.1039/c5ra18439h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Bioinspired ribbed hair arrays have been fabricated by colloidal lithography and plasma etching. After fluorination, the ribbed hair arrays with remarkable superhydrophobicity can present self cleaning performance and a large loading capacity.
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Affiliation(s)
- Dapeng Wang
- Department of Chemistry
- University of Science and Technology of China
- Hefei 230026
- PR China
- Institute of Intelligent Machines
| | - Aiwu Zhao
- Department of Chemistry
- University of Science and Technology of China
- Hefei 230026
- PR China
- Institute of Intelligent Machines
| | - Lei Li
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- PR China
| | - Qinye He
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- PR China
| | - Hongyan Guo
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- PR China
| | - Henghui Sun
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- PR China
| | - Qian Gao
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- PR China
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Sahoo BN, Kandasubramanian B. Recent progress in fabrication and characterisation of hierarchical biomimetic superhydrophobic structures. RSC Adv 2014. [DOI: 10.1039/c4ra00506f] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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10
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Jeon HJ, Yoo HW, Lee EH, Jang SW, Kim JS, Choi JK, Jung HT. Fabrication of complex 3-dimensional patterned structures on a ∼10 nm scale from a single master pattern by secondary sputtering lithography. NANOSCALE 2013; 5:2358-63. [PMID: 23392080 DOI: 10.1039/c3nr33739a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We describe a highly efficient method for fabricating a variety of complex 3D nano-patterns from a single master pattern using secondary sputtering lithography, which is a 10 nm scale patterning method that we have developed. A rapid etching rate in the bottom part of the PS pillar during the RIE process can produce various nanostructure shapes and the PS residual layer thickness can influence various feature dimensions, due to the controlled RIE time leading to different PS layer thicknesses. This technique provides a highly effective method for producing various complex 3D patterns from a single master pattern. Thus, this method can serve as a new procedure for the cost-effective mass production of complex nanoscale patterns with high resolution.
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Affiliation(s)
- Hwan-Jin Jeon
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
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Li CL, Chen JK, Fan SK, Ko FH, Chang FC. Electrorheological operation of low-/high-permittivity core/shell SiO2/Au nanoparticle microspheres for display media. ACS APPLIED MATERIALS & INTERFACES 2012; 4:5650-5661. [PMID: 23016596 DOI: 10.1021/am301543h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this study, we synthesized core/shell structures comprising monodisperse 3-μm SiO(2) microspheres and gold nanoparticles (AuNPs, ca. 6.7 nm) as the core and shell components, respectively. Using a layer-by-layer cross-linking process with a dithiol cross-linking agent, we prepared low-permittivity AuNP-encapsulated high-permittivity SiO(2) core/shell microspheres with variable AuNP shell thicknesses. The dispersivity of the microspheres in solution was enhanced after grafting poly(ethylene glycol) monomethyl ether thiol (PEG-SH) onto the AuNP layer on the SiO(2) microspheres. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images revealed sesame ball-like structures for these SiO(2)@AuNP@PEG microspheres. We encapsulated aqueous dispersions of these SiO(2)@AuNP microspheres into sandwich structured displays (SSDs) to investigate their electrorheological properties, observing reversibly electroresponsive transmittance that is ideally suited for display applications. Increasing the thickness of the AuNP layer dramatically enhanced the stringing behavior of the SiO(2) microspheres, resulting in increased transmittance of the SSD. The response time of the electroresponsive electrorheological fluids also decreased significantly after modifying the SiO(2) with the AuNP layers. The effective permittivities of these composites could be predicted from the real (έ) and imaginary (έ́) parts of the Clausius-Mossotti formalism.
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Affiliation(s)
- Chung-Lin Li
- Department of Materials and Science Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei, 106, Taiwan, Republic of China
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Ma R, Lu N, Liu L, Wang Y, Shi S, Chi L. Fabrication of single gold particle arrays with pattern directed electrochemical deposition. ACS APPLIED MATERIALS & INTERFACES 2012; 4:3779-3783. [PMID: 22856546 DOI: 10.1021/am3010972] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A simple and efficient method for fabricating gold nanoparticle (AuNP) arrays is developed. With this method, the AuNP arrays are fabricated by taking an electrochemical deposition (ECD) process on the ITO substrate, which is initially patterned with nanoimprint lithography (NIL). The stamp for NIL is fabricated by the cost-efficient nanosphere lithography (NSL). The size of the AuNPs can be adjusted by varying the potential and duration of ECD. In this work, the diameters of AuNPs are varied from 130 to 420 nm. The AuNP arrays can be readily extended to other conductive substrates, which may be applied for detecting and sensing.
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Chen JK, Pai PC, Chang JY, Fan SK. pH-responsive one-dimensional periodic relief grating of polymer brush-gold nanoassemblies on silicon surface. ACS APPLIED MATERIALS & INTERFACES 2012; 4:1935-1947. [PMID: 22423620 DOI: 10.1021/am201632e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this work, we focus on the fabrication of the nanoassemblies consisting of the poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) brushes and gold nanoparticles (AuNPs). The employed process involves grafting of the PDMAEMA chains on an underlying substrate in a brush conformation followed by the immobilization of surface functionalized AuNPs by means of physical interaction (electrostatic attraction, entanglement, and hydrogen bonding). Atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy have been employed to characterize the prepared PDMAEMA-AuNP nanoassemblies. Polymer brushes possessing various thicknesses have been found to suppress the nanoparticles' aggregation and, hence, facilitate the surface coverage. Furthermore, we patterned the PDMAEMA-AuNP nanoassemblies as an one-dimensional periodic relief grating (OPRG). The subwavelength structure of OPRG has the optical features including artificial refractive index, form birefringence and resonance and band gap effects. A mean refractive index of the PDMAEMA-AuNP nanoassemblies can be controlled by the filling factors of the OPRG structure, so that a desired distribution of refractive index of the polymer brushes-gold OPRG under various stimuli can be realized. The employed approach is simple and highly versatile for the modification of surfaces with a wide range of NPs.
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Affiliation(s)
- Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China.
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