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Wei X, Chun F, Liu F, Zhang X, Zheng W, Guo Y, Xing Z, An H, Lei D, Tang Y, Yan CH, Wang F. Interfacing Lanthanide Metal-Organic Frameworks with ZnO Nanowires for Alternating Current Electroluminescence. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2305251. [PMID: 37718454 DOI: 10.1002/smll.202305251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Indexed: 09/19/2023]
Abstract
Alternating current electroluminescence (ACEL) devices are attractive candidates in cost-effective lighting, sensing, and flexible displays due to their uniform luminescence, stable performance, and outstanding deformability. However, ACEL devices have suffered from limited options for the light-emitting layer, which presents a significant constraint in the progress of utilizing ACEL. Herein, a new class of ACEL phosphors based on lanthanide metal-organic frameworks (Ln-MOFs) is devised. A synthesis of lanthanide-benzenetricarboxylate (Ln-BTC) thin film on a brass grid substrate seeded with ZnO nanowires (NWs) as anchors is developed. The as-synthesized Ln-BTC thin film is employed as the emissive layer and shows visible electroluminescence driven by alternating current (2.9 V µm-1 , 1 kHz) for the first time. Mechanistic investigations reveal that the Ln-based ACEL stems from impact excitation by accelerated electrons from ZnO NWs. Fine-tuning of the ACEL color is also demonstrated by controlling the Ln-MOF compositions and introducing an extra ZnS emitting layer. The advances in these optical materials expand the application of ACEL devices in anti-counterfeiting.
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Affiliation(s)
- Xiaohe Wei
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Fengjun Chun
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Feihong Liu
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Xin Zhang
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Weilin Zheng
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Yang Guo
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Zhifeng Xing
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Haiyan An
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Dangyuan Lei
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Yu Tang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Chun-Hua Yan
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Feng Wang
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, SAR, 518057, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
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2
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Go E, Kim JW, Jeong JW, Park S, Kang JT, Choi S, Yeon JH, Song YH. Effects of Interfacial Electron Transport on Field Electron Emission from Carbon Nanotube Paste Emitters. ACS APPLIED MATERIALS & INTERFACES 2023; 15:49854-49864. [PMID: 37816129 DOI: 10.1021/acsami.3c11718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Field electron emission from carbon nanotubes (CNT) is preceded by the transport of electrons from the cathode metal to emission sites. Specifically, a supporting layer indispensable for adhesion of CNT paste emitters onto the cathode metal would impose a potential barrier, depending on its work function and interfacial electron transport behaviors. In this paper, we investigated the supporting layer of silicon carbide and nickel nanoparticles reacted onto a Kovar alloy (Fe-Ni-Co) cathode substrate, which has been adopted for reliable CNT paste emitters. The X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and electrical conductivity measurements showed that the reaction of silicon carbide and nickel nanoparticles on the Kovar metal strongly depends upon the post-vacuum-annealing conditions and can be classified into two procedures of a diffusion-induced reaction (DIR) and a diffusion-limited reaction (DLR). The prolonged annealing at 750 °C for 5 h before the main annealing of the CNT paste emitters at 800 °C for 5 min led to the DIR that has enhanced the Ni silicide phase and a lower potential barrier for the interfacial electron transport, resulting in increased and weakly temperature-dependent field electron emission from the CNT paste emitters. On the other hand, the DLR with only the main anneal of the CNT paste emitters at 800 °C for 5 min gave rise to a higher potential barrier for the electron transport and so lower and strongly temperature-dependent field electron emission. From the results of the interfacial electron transport for the DIR and DLR mechanisms in the CNT paste emitters, we concluded that the ambient temperature dependency of field electron emission from CNT tips in the moderate range of up to 400 °C, still controversial, is mainly attributed to the supporting layer of the CNT emitter rather than its intrinsic electron emission.
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Affiliation(s)
- Eunsol Go
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Jae-Woo Kim
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Jin-Woo Jeong
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Sora Park
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Jun-Tae Kang
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Sunghoon Choi
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Ji-Hwan Yeon
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
| | - Yoon-Ho Song
- Intelligent Components and Sensors Research Section, Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
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Mechanical metamaterials made of freestanding quasi-BCC nanolattices of gold and copper with ultra-high energy absorption capacity. Nat Commun 2023; 14:1243. [PMID: 36871035 PMCID: PMC9985601 DOI: 10.1038/s41467-023-36965-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 02/16/2023] [Indexed: 03/06/2023] Open
Abstract
Nanolattices exhibit attractive mechanical properties such as high strength, high specific strength, and high energy absorption. However, at present, such materials cannot achieve effective fusion of the above properties and scalable production, which hinders their applications in energy conversion and other fields. Herein, we report gold and copper quasi-body centered cubic (quasi-BCC) nanolattices with the diameter of the nanobeams as small as 34 nm. We show that the compressive yield strengths of quasi-BCC nanolattices even exceed those of their bulk counterparts, despite their relative densities below 0.5. Simultaneously, these quasi-BCC nanolattices exhibit ultrahigh energy absorption capacities, i.e., 100 ± 6 MJ m-3 for gold quasi-BCC nanolattice and 110 ± 10 MJ m-3 for copper quasi-BCC nanolattice. Finite element simulations and theoretical calculations reveal that the deformation of quasi-BCC nanolattice is dominated by nanobeam bending. And the anomalous energy absorption capacities substantially stem from the synergy of the naturally high mechanical strength and plasticity of metals, the size reduction-induced mechanical enhancement, and the quasi-BCC nanolattice architecture. Since the sample size can be scaled up to macroscale at high efficiency and affordable cost, the quasi-BCC nanolattices with ultrahigh energy absorption capacity reported in this work may find great potentials in heat transfer, electric conduction, catalysis applications.
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Lyu S, Zhang Y, Du G, Di C, Yao H, Fan Y, Duan J, Lei D. Double-sided plasmonic metasurface for simultaneous biomolecular separation and SERS detection. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 285:121801. [PMID: 36122462 DOI: 10.1016/j.saa.2022.121801] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 08/26/2022] [Accepted: 08/27/2022] [Indexed: 06/15/2023]
Abstract
Porous membrane-based nanofiltration separation of small biomolecules is a widely used biotechnology for which size-based selectivity is a critical parameter of technological relevance. Efficient determination of size selectivity calls for an advanced detection method capable of performing sensitive, rapid, and on-membrane examination. Surface-enhanced Raman spectroscopy (SERS) is such a detection method that has been widely recognized as an ultrasensitive technique for trace-level detection with sensitivity down to the single-molecule level. In this work, we for the first time develop a double-sided hierarchical porous membrane-like plasmonic metasurface to realize high-selectivity bimolecular separation and simultaneous ultrasensitive SERS detection. This highly flexible device, consisting of subwavelength nanocone pairs surrounded by randomly orientated sub-5 nm nanogrooves, was prepared by combining customized "top-down" fabrication of conical nanopores in an ion-track registered polycarbonate membrane and self-assembly of nanogrooves on the membrane surface through physical vapor deposition. The unique tip-to-tip oriented conical nanopores in the device enables excellent size-based molecular selectivity; the hierarchical groove-pore structure supports a peculiar cascaded electromagnetic near-field enhancement mechanism, endowing the device with SERS-based molecular detection of ultrahigh sensitivity, uniformity, repeatability, and polarization independence. With such dual structural merits and performance enhancement, we demonstrate effective nanofiltration separation of small-sized adenine from big-sized ss-DNA and synergistic SERS determination of their species. We experimentally demonstrate an ultrasensitive detection of 4-mercaptopyridine down to 10 pM. Together with its unparalleled mechanical flexibility, this double-side-responsive plasmonic metasurface membrane can find great potential in real-world molecular filtration and detection under extremely complex working conditions.
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Affiliation(s)
- Shuangbao Lyu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongliang Zhang
- Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
| | - Guanghua Du
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cuixia Di
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Huijun Yao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, China
| | - Yulong Fan
- Department of Materials Science and Engineering, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Jinglai Duan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, China.
| | - Dangyuan Lei
- Department of Materials Science and Engineering, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong, China.
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5
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Jonker D, Berenschot EJW, Tas NR, Tiggelaar RM, van Houselt A, Gardeniers HJGE. Large Dense Periodic Arrays of Vertically Aligned Sharp Silicon Nanocones. NANOSCALE RESEARCH LETTERS 2022; 17:100. [PMID: 36245035 PMCID: PMC9573847 DOI: 10.1186/s11671-022-03735-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/25/2022] [Indexed: 06/16/2023]
Abstract
Convex cylindrical silicon nanostructures, also referred to as silicon nanocones, find their value in many applications ranging from photovoltaics to nanofluidics, nanophotonics, and nanoelectronic applications. To fabricate silicon nanocones, both bottom-up and top-down methods can be used. The top-down method presented in this work relies on pre-shaping of silicon nanowires by ion beam etching followed by self-limited thermal oxidation. The combination of pre-shaping and oxidation obtains high-density, high aspect ratio, periodic, and vertically aligned sharp single-crystalline silicon nanocones at the wafer-scale. The homogeneity of the presented nanocones is unprecedented and may give rise to applications where numerical modeling and experiments are combined without assumptions about morphology of the nanocone. The silicon nanocones are organized in a square periodic lattice, with 250 nm pitch giving arrays containing 1.6 billion structures per square centimeter. The nanocone arrays were several mm2 in size and located centimeters apart across a 100-mm-diameter single-crystalline silicon (100) substrate. For single nanocones, tip radii of curvature < 3 nm were measured. The silicon nanocones were vertically aligned, baring a height variation of < 5 nm (< 1%) for seven adjacent nanocones, whereas the height inhomogeneity is < 80 nm (< 16%) across the full wafer scale. The height inhomogeneity can be explained by inhomogeneity present in the radii of the initial columnar polymer mask. The presented method might also be applicable to silicon micro- and nanowires derived through other top-down or bottom-up methods because of the combination of ion beam etching pre-shaping and thermal oxidation sharpening. A novel method is presented where argon ion beam etching and thermal oxidation sharpening are combined to tailor a high-density single-crystalline silicon nanowire array into a vertically aligned single-crystalline silicon nanocones array with < 3 nm apex radius of curvature tips, at the wafer scale.
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Affiliation(s)
- Dirk Jonker
- Mesoscale Chemical Systems, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
- Physics of Interfaces and Nanomaterials, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
| | - Erwin J W Berenschot
- Mesoscale Chemical Systems, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - Niels R Tas
- Mesoscale Chemical Systems, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - Roald M Tiggelaar
- NanoLab Cleanroom, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - Arie van Houselt
- Physics of Interfaces and Nanomaterials, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - Han J G E Gardeniers
- Mesoscale Chemical Systems, University of Twente, MESA+ Institute, P.O. Box 217, 7500 AE, Enschede, The Netherlands
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6
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Akther A, Walsh EP, Reineck P, Gibson BC, Ohshima T, Abe H, McColl G, Jenkins NL, Hall LT, Simpson DA, Rezk AR, Yeo LY. Acoustomicrofluidic Concentration and Signal Enhancement of Fluorescent Nanodiamond Sensors. Anal Chem 2021; 93:16133-16141. [PMID: 34813284 DOI: 10.1021/acs.analchem.1c03893] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Diamond nitrogen-vacancy (NV) centers constitute a promising class of quantum nanosensors owing to the unique magneto-optic properties associated with their spin states. The large surface area and photostability of diamond nanoparticles, together with their relatively low synthesis costs, make them a suitable platform for the detection of biologically relevant quantities such as paramagnetic ions and molecules in solution. Nevertheless, their sensing performance in solution is often hampered by poor signal-to-noise ratios and long acquisition times due to distribution inhomogeneities throughout the analyte sample. By concentrating the diamond nanoparticles through an intense microcentrifugation effect in an acoustomicrofluidic device, we show that the resultant dense NV ensembles within the diamond nanoparticles give rise to an order-of-magnitude improvement in the measured acquisition time. The ability to concentrate nanoparticles under surface acoustic wave (SAW) microcentrifugation in a sessile droplet is, in itself, surprising given the well-documented challenge of achieving such an effect for particles below 1 μm in dimension. In addition to a demonstration of their sensing performance, we thus reveal in this work that the reason why the diamond nanoparticles readily concentrate under the SAW-driven recirculatory flow can be attributed to their considerably higher density and hence larger acoustic contrast compared to those for typical particles and cells for which the SAW microcentrifugation flow has been shown to date.
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Affiliation(s)
- Asma Akther
- Micro/Nanophysics Research Laboratory, School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Ella P Walsh
- School of Physics, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Philipp Reineck
- ARC Centre of Excellence for Nanoscale BioPhotonics & School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Brant C Gibson
- ARC Centre of Excellence for Nanoscale BioPhotonics & School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Takeshi Ohshima
- National Institutes for Quantum Science and Technology, Takasaki, Gunma 370-1292, Japan
| | - Hiroshi Abe
- National Institutes for Quantum Science and Technology, Takasaki, Gunma 370-1292, Japan
| | - Gawain McColl
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne Parkville, Victoria 3010, Australia
| | - Nicole L Jenkins
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne Parkville, Victoria 3010, Australia
| | - Liam T Hall
- School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - David A Simpson
- School of Physics, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Amgad R Rezk
- Micro/Nanophysics Research Laboratory, School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Leslie Y Yeo
- Micro/Nanophysics Research Laboratory, School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia
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7
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Tang L, Vo T, Fan X, Vecchio D, Ma T, Lu J, Hou H, Glotzer SC, Kotov NA. Self-Assembly Mechanism of Complex Corrugated Particles. J Am Chem Soc 2021; 143:19655-19667. [PMID: 34784206 DOI: 10.1021/jacs.1c05488] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A variety of inorganic nanoscale materials produce microscale particles with highly corrugated geometries, but the mechanism of their formation remains unknown. Here we found that uniformly sized CdS-based hedgehog particles (HPs) self-assemble from polydisperse nanoparticles (NPs) with diameters of 1.0-4.0 nm. The typical diameters of HPs and spikes are 1770 ± 180 and 28 ± 3 nm, respectively. Depending on the temperature, solvent, and reaction times, the NPs self-assemble into nanorods, nanorod aggregates, low-corrugation particles, and other HP-related particles with complexity indexes ranging from 0 to 23.7. We show that "hedgehog", other geometries, and topologies of highly corrugated particles originate from the thermodynamic preference of polydisperse NPs to attach to the growing nanoscale cluster when electrostatic repulsion competes with van der Waals attraction. Theoretical models and simulations of the self-assembly accounting for the competition of attractive and repulsive interactions in electrolytes accurately describe particle morphology, growth stages, and the spectrum of observed products. When kinetic parameters are included in the models, the formation of corrugated particles with surfaces decorated by nanosheets, known as flower-like particles, were theoretically predicted and experimentally observed. The generality of the proposed mechanism was demonstrated for the formation of mixed HPs via a combination of CdS and Co3O4 NPs. With unusually high dispersion stability of HPs in unfavorable solvents including liquid CO2, mechanistic insights into HP formation are essential for their structural adaptation for applications from energy storage, catalysis, water treatment, and others.
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Affiliation(s)
- Lanqin Tang
- Department of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, P. R. China.,Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Thi Vo
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Xiaoxing Fan
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,School of Physics, Liaoning University, Shenyang, Liaoning 110036, P. R. China
| | - Drew Vecchio
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Tao Ma
- Michigan Center for Materials Characterization, University of Michigan, Ann Arbor, Michigan 48109-2102, United States.,Department of Materials Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jun Lu
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Harrison Hou
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Sharon C Glotzer
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Nicholas A Kotov
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
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Ulrich N, Spende A, Burr L, Sobel N, Schubert I, Hess C, Trautmann C, Toimil-Molares ME. Conical Nanotubes Synthesized by Atomic Layer Deposition of Al 2O 3, TiO 2, and SiO 2 in Etched Ion-Track Nanochannels. NANOMATERIALS 2021; 11:nano11081874. [PMID: 34443705 PMCID: PMC8399865 DOI: 10.3390/nano11081874] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/16/2021] [Accepted: 07/19/2021] [Indexed: 12/13/2022]
Abstract
Etched ion-track polycarbonate membranes with conical nanochannels of aspect ratios of ~3000 are coated with Al2O3, TiO2, and SiO2 thin films of thicknesses between 10 and 20 nm by atomic layer deposition (ALD). By combining ion-track technology and ALD, the fabrication of two kinds of functional structures with customized surfaces is presented: (i) arrays of free-standing conical nanotubes with controlled geometry and wall thickness, interesting for, e.g., drug delivery and surface wettability regulation, and (ii) single nanochannel membranes with inorganic surfaces and adjustable isoelectric points for nanofluidic applications.
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Affiliation(s)
- Nils Ulrich
- Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; (A.S.); (L.B.); (I.S.); (C.T.)
- Material-und Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
- Correspondence: (N.U.); (M.E.T.-M.); Tel.: +49-6159-71-1807 (M.E.T.-M.)
| | - Anne Spende
- Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; (A.S.); (L.B.); (I.S.); (C.T.)
- Material-und Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
| | - Loïc Burr
- Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; (A.S.); (L.B.); (I.S.); (C.T.)
- Material-und Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
| | - Nicolas Sobel
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany; (N.S.); (C.H.)
| | - Ina Schubert
- Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; (A.S.); (L.B.); (I.S.); (C.T.)
| | - Christian Hess
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany; (N.S.); (C.H.)
| | - Christina Trautmann
- Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; (A.S.); (L.B.); (I.S.); (C.T.)
- Material-und Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany
| | - Maria Eugenia Toimil-Molares
- Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; (A.S.); (L.B.); (I.S.); (C.T.)
- Correspondence: (N.U.); (M.E.T.-M.); Tel.: +49-6159-71-1807 (M.E.T.-M.)
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9
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Fabrication of Size- and Shape-Controlled Platinum Cones by Ion-Track Etching and Electrodeposition Techniques for Electrocatalytic Applications. QUANTUM BEAM SCIENCE 2021. [DOI: 10.3390/qubs5030021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The micro/nanocone structures of noble metals play a critical role as heterogeneous electrocatalysts that provide excellent activity. We successfully fabricated platinum cones by electrodeposition using non-penetrated porous membranes as templates. This method involved the preparation of template membranes by the swift-heavy-ion irradiation of commercially available polycarbonate films and subsequent chemical etching in an aqueous NaOH solution. The surface diameter, depth, aspect ratio and cone angle of the resulting conical pores were controlled in the ranges of approximately 70–1500 nm, 0.7–11 μm, 4–12 and 5–13°, respectively, by varying the etching conditions, which finally produced size- and shape-controlled platinum cones with nanotips. In order to demonstrate the electrocatalytic activity, electrochemical measurements were performed for the ethanol oxidation reaction. The oxidation activity was found to be up to 3.2 times higher for the platinum cone arrays than for the platinum plate. Ion-track etching combined with electrodeposition has the potential to be an effective method for the fabrication of micro/nanocones with high electrocatalytic performance.
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10
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Shen Y, Han Y, Zhan R, Zhao P, Zhang Y, Liu F, Chen J, She J, Xu N, Deng S. Study on Pyramidal Molybdenum Nanostructures Cold Cathode with Large-Current Properties Based on Self-Assembly Growth Method. ACS APPLIED MATERIALS & INTERFACES 2020; 12:35354-35364. [PMID: 32654476 DOI: 10.1021/acsami.0c09345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In order to develop a field emission cold cathode for power vacuum electronic device applications, it is important to realize the properties of large-current and high current density. This requires the design and preparation of cold cathode materials with good crystallization, suitable geometric structure, and good contact interface. In this study, we report a pyramidal molybdenum nanostructure with single crystalline nature, which was self-assembly grown by a thermal evaporation method. We also report the optimization of the nanostructure, successfully sharpening its top end and reducing the thickness of the intermediate layer between the structure and the substrate (from 31.4 to 3.1 nm). By this way, the pyramidal molybdenum nanostructure exhibits high conductivity of about 1.8 × 105 Ω-1 cm-1. The cold cathode composed by these nanostructures shows a large-current field emission performance, with the largest emission current of 47.62 mA as well as the highest current density of 2.38 A cm-2, under a pulsed electric field as high as 28 V μm-1. The proposed pyramidal molybdenum nanostructures provide a candidate for the large-current cold cathode of the power electronic devices.
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Affiliation(s)
- Yan Shen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Yuchen Han
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Runze Zhan
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Peng Zhao
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Yu Zhang
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Fei Liu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Jun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Juncong She
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Ningsheng Xu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Shaozhi Deng
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
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11
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Shen Y, Han Y, Zhan R, Chen X, Wen S, Huang W, Sun F, Wei Y, Chen H, Wu J, Chen J, Xu N, Deng S. Pyramid-Shaped Single-Crystalline Nanostructure of Molybdenum with Excellent Mechanical, Electrical, and Optical Properties. ACS APPLIED MATERIALS & INTERFACES 2020; 12:24218-24230. [PMID: 32374587 DOI: 10.1021/acsami.0c02351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Specific geometric morphology and improved crystalline properties are of great significance for the development of materials in micro-nano scale. However, for high-melting molybdenum (Mo), it is difficult to get high-quality structures exhibiting a single-crystalline nature and preconceived morphology simultaneously. In this paper, a pyramid-shaped single-crystalline Mo nanostructure was prepared through a thermal evaporation technique, as well as a series of experimental controls. Based on detailed characterizations, the growth mechanism was demonstrated to follow a sequential process that includes MoO2 decomposition and Mo deposition, single-crystalline islands formation, layered nucleation, and competitive growth. Furthermore, the product was measured to show excellent physical properties. The prepared nanostructures exhibited strong nano-indentation hardness, elastic modulus, and tensile strength in mechanical measurements, which are much higher than those of the Mo bulks. In the measurement of electronic characteristics, the individual structures indicated very good electrical transport properties, with a conductance of ∼0.16 S. The prepared film with an area of 0.02 cm2 showed large-current electron emission properties with a maximum current of 33.6 mA and a current density of 1.68 A cm-2. Optical properties of the structures were measured to show obvious electromagnetic field localization and enhancement, which enabled it to have good surface enhanced Raman scattering (SERS) activity as a substrate material. The corresponding structure-response relationships were further discussed. The reported physical properties profit from the basic features of the Mo nanostructures, including the micro-nano scale, the single-crystalline nature in each grain, as well as the pyramid-shaped top morphology. The findings may provide a potential material for the research and application of micro-nano electrons and photons.
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Affiliation(s)
- Yan Shen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Yuchen Han
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Runze Zhan
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Xuexian Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Shiya Wen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Wuchao Huang
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Fengsheng Sun
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Yaoming Wei
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Huanjun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Jin Wu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Jun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Ningsheng Xu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Shaozhi Deng
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
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12
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Zhang W, Zhang J, Wu P, Chai G, Huang R, Ma F, Xu F, Cheng H, Chen Y, Ni X, Qiao L, Duan J. Parallel Aligned Nickel Nanocone Arrays for Multiband Microwave Absorption. ACS APPLIED MATERIALS & INTERFACES 2020; 12:23340-23346. [PMID: 32348113 DOI: 10.1021/acsami.0c04247] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Magnetic nanostructures with conical shape are highly desired for pursuing extraordinary magnetic properties and microwave absorption. However, the fabrication of such nanostructures with controlled shape and size uniformities and alignment is not yet realized. Accordingly, the magnetic properties and their application as microwave absorber are not well understood. Here, we report on the first demonstration of controlled fabrication of soft magnetic nickel nanocone arrays with sharp geometry, large aspect ratio, uniform size, and parallel alignment. The imaginary part of the relative complex permeability shows multiband absorption in the 2-17 GHz range. Such an exceptional microwave absorption results from the uniform conical shape and size and the parallel alignment. The absorption mechanisms are discussed under the framework of natural resonance and exchange resonance. The natural resonance is dependent on the shape anisotropy and facilitated by the conical geometry. The exchange resonance is well explained by the observation of the bulk spin waves with exchange coupling at the tip of nanocones using the inelastic light scattering and is consistent with exchange theory predictions for the quantization of bulk spin waves. We expect that our work will shed light on the physical insights into the magnetic properties of nanocones and find great potential in applications of microwave absorption.
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Affiliation(s)
- Wanling Zhang
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Jiaming Zhang
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Peng Wu
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Guozhi Chai
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Ran Huang
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fei Ma
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Fangfang Xu
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongwei Cheng
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yonghui Chen
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, Guangdong, China
| | - Xia Ni
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Liang Qiao
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Jinglai Duan
- Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, Guangdong, China
- Huizhou Research Center of Ion Sciences, Huizhou 516000, Guangdong, China
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13
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Li W, Zhan X, Song X, Si S, Chen R, Liu J, Wang Z, He J, Xiao X. A Review of Recent Applications of Ion Beam Techniques on Nanomaterial Surface Modification: Design of Nanostructures and Energy Harvesting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1901820. [PMID: 31166661 DOI: 10.1002/smll.201901820] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/13/2019] [Indexed: 05/23/2023]
Abstract
Nanomaterials have gained plenty of research interest because of their excellent performance, which is derived from their small size and special structure. In practical applications, to acquire nanomaterials with high performance, many methods have been used to modulate the structure and components of materials. To date, ion beam techniques have extensively been applied for modulating the performance of various nanomaterials. Energetic ion beams can modulate the surface morphology and chemical components of nanomaterials. In addition, ion beam techniques have also been used to fabricate nanomaterials, including 2D materials, nanoparticles, and nanowires. Compared with conventional methods, ion beam techniques, including ion implantation, ion irradiation, and focused ion beam, are all pure physical processes; these processes do not introduce any impurities into the target materials. In addition, ion beam techniques exhibit high controllability and repeatability. Here, recent progress in ion beam techniques for nanomaterial surface modification is systematically summarized and existing challenges and potential solutions are presented.
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Affiliation(s)
- Wenqing Li
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam Application, Wuhan University, Wuhan, 430072, P. R. China
| | - Xueying Zhan
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Xianyin Song
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam Application, Wuhan University, Wuhan, 430072, P. R. China
| | - Shuyao Si
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam Application, Wuhan University, Wuhan, 430072, P. R. China
| | - Rui Chen
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam Application, Wuhan University, Wuhan, 430072, P. R. China
| | - Jing Liu
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam Application, Wuhan University, Wuhan, 430072, P. R. China
| | - Zhenxing Wang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Jun He
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Xiangheng Xiao
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam Application, Wuhan University, Wuhan, 430072, P. R. China
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14
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Ohkubo Y, Nakagawa T, Endo K, Yamamura K. Influence of air contamination during heat-assisted plasma treatment on adhesion properties of polytetrafluoroethylene (PTFE). RSC Adv 2019; 9:22900-22906. [PMID: 35514469 PMCID: PMC9067102 DOI: 10.1039/c9ra01789e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 07/12/2019] [Indexed: 11/21/2022] Open
Abstract
Plasma surface treatment is typically not effective on fluoropolymers containing polytetrafluoroethylene (PTFE). It is reported that heat-assisted plasma (HAP) treatment at high temperatures (above 200 °C) under atmospheric pressure helium (He) plasma improves the adhesion properties of PTFE. In this study, we investigated the influence of the air concentration during HAP treatment on the adhesion properties of PTFE. Air concentration was controlled via ambient air inflow amount, in other words, base pressure. The PTFE samples HAP-treated in different air concentrations were thermally compressed with an unvulcanized isobutylene-isoprene rubber (IIR). Then, the PTFE/IIR adhesion strength was measured via T-peel test. We show that, when PTFE was HAP-treated in 0.01% air, its PTFE/IIR adhesion strength was over 2 N mm-1; the IIR underwent cohesion failure. However, the PTFE/IIR adhesion strength drastically decreased in the presence of air contamination. The relationships between air concentration during HAP treatment, adhesion properties of PTFE, surface chemical composition, surface morphology, and surface hardness were investigated and discussed.
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Affiliation(s)
- Yuji Ohkubo
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita Osaka 565-0871 Japan
| | - Tetsuya Nakagawa
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita Osaka 565-0871 Japan
| | - Katsuyoshi Endo
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita Osaka 565-0871 Japan
| | - Kazuya Yamamura
- Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita Osaka 565-0871 Japan
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15
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Bankar PK, Khandare LN, Late DJ, More MA. Enhanced Field Emission Performance of MoO3
Nanorods and MoO3
-rGO Nanocomposite. ChemistrySelect 2017. [DOI: 10.1002/slct.201701914] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Prashant K. Bankar
- Centre for Advanced Studies in Materials Science and Condensed; Matter Physics, Department of Physics; Savitribai Phule Pune University; Pune 411007 India
| | - Lina N. Khandare
- Physical and Materials Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road, Pashan Pune - 411008 India
| | - Dattatray J. Late
- Physical and Materials Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road, Pashan Pune - 411008 India
| | - Mahendra A. More
- Centre for Advanced Studies in Materials Science and Condensed; Matter Physics, Department of Physics; Savitribai Phule Pune University; Pune 411007 India
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16
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Chen Y, Xu C, Zhou Y, Maaz K, Yao H, Mo D, Lyu S, Duan J, Liu J. Temperature- and Angle-Dependent Magnetic Properties of Ni Nanotube Arrays Fabricated by Electrodeposition in Polycarbonate Templates. NANOMATERIALS 2016; 6:nano6120231. [PMID: 28335359 PMCID: PMC5302721 DOI: 10.3390/nano6120231] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 11/15/2016] [Accepted: 11/24/2016] [Indexed: 12/28/2022]
Abstract
Parallel arrays of Ni nanotubes with an external diameter of 150 nm, a wall thickness of 15 nm, and a length of 1.2 ± 0.3 µm were successfully fabricated in ion-track etched polycarbonate (PC) templates by electrochemical deposition. The morphology and crystal structure of the nanotubes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Structural analyses indicate that Ni nanotubes have a polycrystalline structure with no preferred orientation. Angle dependent hysteresis studies at room temperature carried out by using a vibrating sample magnetometer (VSM) demonstrate a transition of magnetization between the two different magnetization reversal modes: curling rotation for small angles and coherent rotation for large angles. Furthermore, temperature dependent magnetic analyses performed with a superconducting quantum interference device (SQUID) magnetometer indicate that magnetization of the nanotubes follows modified Bloch's law in the range 60-300 K, while the deviation of the experimental curve from this law below 60 K can be attributed to the finite size effects in the nanotubes. Finally, it was found that coercivity measured at different temperatures follows Kneller's law within the premises of Stoner-Wohlfarth model for ferromagnetic nanostructures.
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Affiliation(s)
- Yonghui Chen
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Chen Xu
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Yibo Zhou
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Khan Maaz
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- Nanomaterials Research Group, Physics Division, PINSTECH, Nilore, Islamabad 45650, Pakistan.
| | - Huijun Yao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Dan Mo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Shuangbao Lyu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Jinglai Duan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Jie Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
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17
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Tang CM, Wang YB, Yao RH, Ning HL, Qiu WQ, Liu ZW. Enhanced adhesion and field emission of CuO nanowires synthesized by simply modified thermal oxidation technique. NANOTECHNOLOGY 2016; 27:395605. [PMID: 27560484 DOI: 10.1088/0957-4484/27/39/395605] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Metal oxide nanowires (NWs) can be easily grown by the thermal oxidation method, but the low adhesion between the NWs and the substrate restricts their practical applications in functional devices. In this work, the conventional hotplate technique is simply modified by introducing one or two stainless steel plates to supply a more stable oxidation environment, which is found to be beneficial to the growth and adhesion of CuO NWs on the Cu substrate. In detail, the Cu foils were heated on the hotplate directly, on one plate over the hotplate, and between two plates over the hotplate at 400 °C in ambient condition. It is found that the NWs obtained between two plates exhibit large length and diameter with moderate density. The sufficient activated oxygen, stable temperature, and proper temperature gradient configuration caused by the two plates accelerate the formation of CuO NWs, and result in the longest NWs with enhanced adhesion. The grain-boundary diffusion and Kirkendall effect are proposed to explain the mechanism of NWs growth and the formation of cracks. The NWs obtained between two plates also showed the best field emission properties, with lowest turn-on field (5.31 V μm(-1)) and threshold field (9.8 V μm(-1)). Excellent field emission properties and enhanced NW-substrate adhesion indicate that these NW arrays could be potentially used as the cathode of field emission displays.
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Affiliation(s)
- C M Tang
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People's Republic of China
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18
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Popa AC, Stan GE, Besleaga C, Ion L, Maraloiu VA, Tulyaganov DU, Ferreira JMF. Submicrometer Hollow Bioglass Cones Deposited by Radio Frequency Magnetron Sputtering: Formation Mechanism, Properties, and Prospective Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2016; 8:4357-4367. [PMID: 26836256 DOI: 10.1021/acsami.6b00606] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work reports on the unprecedented magnetron sputtering deposition of submicrometric hollow cones of bioactive glass at low temperature in the absence of any template or catalyst. The influence of sputtering conditions on the formation and development of bioglass cones was studied. It was shown that larger populations of well-developed cones could be achieved by increasing the argon sputtering pressure. A mechanism describing the growth of bioglass hollow cones is presented, offering the links for process control and reproducibility of the cone features. The composition, structure, and morphology of the as-synthesized hollow cones were investigated by energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), grazing incidence geometry X-ray diffraction (GIXRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM)-selected area electron diffraction (SAED). The in vitro biological performance, assessed by degradation tests (ISO 10993-14) and cytocompatibility assays (ISO 10993-5) in endothelial cell cultures, was excellent. This allied with resorbability and the unique morphological features make the submicrometer hollow cones interesting candidate material devices for focal transitory permeabilization of the blood-brain barrier in the treatment of carcinoma and neurodegenerative disorders.
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Affiliation(s)
- A C Popa
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
- Army Centre for Medical Research , 010195 Bucharest, Romania
| | - G E Stan
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
| | - C Besleaga
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
| | - L Ion
- University of Bucharest , Faculty of Physics, 077125 Magurele, Ilfov, Romania
| | - V A Maraloiu
- National Institute of Materials Physics , 077125 Magurele, Ilfov, Romania
| | - D U Tulyaganov
- Turin Polytechnic University in Tashkent , 100095 Tashkent, Uzbekistan
| | - J M F Ferreira
- Department of Materials and Ceramic Engineering, CICECO, University of Aveiro , 3810-193 Aveiro, Portugal
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