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Nanomaterials
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Multifunctional Metallic Nanomaterials
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Multifunctional Metallic Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (31 July 2017) | Viewed by 23951

Special Issue Editors

Prof. Dr. Jordi Sort

E-Mail Website
Guest Editor
Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
Interests: metallic alloys; composite materials; nanomaterials; biomaterials; thin films; nanoporous materials; surface treatments; mechanical performance; magnetism
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Eva Pellicer

E-Mail Website
Guest Editor
Departament de Física, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Interests: electrodeposition; alloys; mesoporous films; electrocatalysis; magnetic properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are launching a Special Issue in Nanomaterials (IF: 2.690) entitled “Multifunctional Metallic Nanomaterials”. The aim of this Special Issue is to publish research articles and topical reviews focused on metallic nanomaterials that show interesting multifunctional properties, i.e., that can be used in various technological applications, taking advantage of synergistic or complementary physical and/or chemical properties. The investigated materials must be nanometric in at least one of their dimensions. This includes: Thin films (fully dense or nanoporous), nanoparticles, nanorods, nanowires/nanotubes and other types of lithographed structures. The materials can be one-component or consist of various counterparts (hybrid or composite metallic nanomaterials). The Special Issue is aimed at providing selected contributions on advances in the synthesis, characterization, and applications of the aforementioned materials. Special emphasis is laid on their potential uses in magnetism, spintronics, biomedicine, electrocatalysis or miniaturized micro/nano-electro-mechanical systems (MEMS/NEMS), among others.

Prof. Dr. Jordi Sort
Dr. Eva Pellicer
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metallic films
  • metallic nanoparticles
  • lithographed metallic structures
  • synthetic applications
  • magnetic properties, spintronics
  • biodegradable alloys
  • electrocatalysis
  • mechanical and structural applications

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Published Papers (4 papers)

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Research

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10463 KiB  
Article
Bi-Component Nanostructured Arrays of Co Dots Embedded in Ni80Fe20 Antidot Matrix: Synthesis by Self-Assembling of Polystyrene Nanospheres and Magnetic Properties
by Marco Coïsson, Federica Celegato, Gabriele Barrera, Gianluca Conta, Alessandro Magni and Paola Tiberto
Nanomaterials 2017, 7(9), 232; https://doi.org/10.3390/nano7090232 - 23 Aug 2017
Cited by 8 | Viewed by 4659
Abstract
A bi-component nanostructured system composed by a Co dot array embedded in a Ni80Fe20 antidot matrix has been prepared by means of the self-assembling polystyrene nanospheres lithography technique. Reference samples constituted by the sole Co dots or Ni80Fe [...] Read more.
A bi-component nanostructured system composed by a Co dot array embedded in a Ni80Fe20 antidot matrix has been prepared by means of the self-assembling polystyrene nanospheres lithography technique. Reference samples constituted by the sole Co dots or Ni80Fe20 antidots have also been prepared, in order to compare their properties with those of the bi-component material. The coupling between the two ferromagnetic elements has been studied by means of magnetic and magneto-transport measurements. The Ni80Fe20 matrix turned out to affect the vortex nucleation field of the Co dots, which in turn modifies the magneto-resistance behaviour of the system and its spinwave properties. Full article
(This article belongs to the Special Issue Multifunctional Metallic Nanomaterials)
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6276 KiB  
Article
Sintering Inhibition of Silver Nanoparticle Films via AgCl Nanocrystal Formation
by Thomas Öhlund, Magnus Hummelgård and Håkan Olin
Nanomaterials 2017, 7(8), 224; https://doi.org/10.3390/nano7080224 - 17 Aug 2017
Cited by 1 | Viewed by 7166
Abstract
Electrically conductive films are key components in most printed and flexible electronics applications. For the solution processing of conductive films, inks containing silver nanoparticles (AgNPs) remain important because of their relatively easy processing and generally low resistivity after a sintering procedure. Because the [...] Read more.
Electrically conductive films are key components in most printed and flexible electronics applications. For the solution processing of conductive films, inks containing silver nanoparticles (AgNPs) remain important because of their relatively easy processing and generally low resistivity after a sintering procedure. Because the commonly used, moderate sintering temperatures of 150–300 °C are still too high for most low-cost flexible substrates, expanding the knowledge of surface-ink interactions that affect the sintering temperature is desirable. It is known that chloride ions can assist the sintering of AgNP films by displacing capping agents on the surfaces of AgNPs. However, very little is known about other possible Cl-AgNP interactions that affect the resistivity and no interaction having the opposite effect (sintering inhibition) has been identified before. Here we identify such a Cl-AgNP interaction giving sintering inhibition and find that the mechanism involves the formation of AgCl nanocrystals within the AgNP film. The AgCl formation was observed after inkjet-printing of AgNP inks with polyvinylpyrrolidone (PVP) as the capping agent onto papers with quick-absorbing coatings containing 0.3 wt % KCl. Our findings show that chloride can have opposite roles during sintering, either assisting or inhibiting the sintering depending on the prevalence of AgCl formation. The prevalence of AgCl formation depends on the absorption properties and the capping agent. Full article
(This article belongs to the Special Issue Multifunctional Metallic Nanomaterials)
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2750 KiB  
Article
Broadband Ultra-Deep Sub-Diffraction-Limit Optical Focusing by Metallic Graded-Index (MGRIN) Lenses
by Yechuan Zhu, Weizheng Yuan, Hao Sun and Yiting Yu
Nanomaterials 2017, 7(8), 221; https://doi.org/10.3390/nano7080221 - 12 Aug 2017
Cited by 12 | Viewed by 4600
Abstract
The development of techniques for efficiently confining energy in the visible and infrared spectral regions to the deep subwavelength spatial scale with dimensions as small as a few nanometers would have great significance for scientific research and engineering practices. Such an ability to [...] Read more.
The development of techniques for efficiently confining energy in the visible and infrared spectral regions to the deep subwavelength spatial scale with dimensions as small as a few nanometers would have great significance for scientific research and engineering practices. Such an ability to manipulate light is impossible for conventional dielectric lenses due to the diffraction limit. Here, we propose a metallic graded-index (MGRIN) lens formed by an array of coupled metallic waveguides with identical nanoscale widths embedded by index-varying dielectrics to enable the optical nanofocusing. The focusing mechanism of the MGRIN lens is theoretically investigated based on Hamiltonian optics, which are verified by the finite-difference time-domain (FDTD) method. Numerical results reveal that an ultra-deep subwavelength focus of 8 nm (λ/500) with a long focal depth (1.93λ) and enhanced field intensity can be achieved. Moreover, the nanofocusing capability of the MGRIN lens without redesigning the structure can be well kept when the incident wavelength changes over a broad range from visible to infrared. Our design of optical nanofocusing shows great potential for use in nano-optics and nanotechnology. Full article
(This article belongs to the Special Issue Multifunctional Metallic Nanomaterials)
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Review

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9037 KiB  
Review
Review of the Functions of Archimedes’ Spiral Metallic Nanostructures
by Zhongyi Guo, Zixiang Li, Jingran Zhang, Kai Guo, Fei Shen, Qingfeng Zhou and Hongping Zhou
Nanomaterials 2017, 7(11), 405; https://doi.org/10.3390/nano7110405 - 22 Nov 2017
Cited by 20 | Viewed by 6361
Abstract
Here, we have reviewed some typical plasmonic structures based on Archimedes’ spiral (AS) architectures, which can produce polarization-sensitive focusing phenomenon and generate plasmonic vortices (PVs) carrying controllable orbital angular momentum (OAM) because of the relation between the incident polarized states and the chiralities [...] Read more.
Here, we have reviewed some typical plasmonic structures based on Archimedes’ spiral (AS) architectures, which can produce polarization-sensitive focusing phenomenon and generate plasmonic vortices (PVs) carrying controllable orbital angular momentum (OAM) because of the relation between the incident polarized states and the chiralities of the spiral structures. These features can be used to analyze different circular polarization states, which has been one of the rapidly developing researching topics in nanophotonics in recent years. Many investigations demonstrate that the multifunctional spiral-based plasmonic structures are excellent choices for chiral selection and generating the transmitted field with well-defined OAM. The circular polarization extinction ratio, as an evaluation criterion for the polarization selectivity of a designed structure, could be effectively improved by properly modulating the parameters of spiral structures. Such functional spiral plasmonic nanostructures are promising for applications in analyzing circular polarization light, full Stokes vector polarimetric sensors, near-field imaging, and so on. Full article
(This article belongs to the Special Issue Multifunctional Metallic Nanomaterials)
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