Special Issue "Advanced Noble Metal Nanoparticles"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: 31 January 2021.

Special Issue Editor

Prof. Dr. Angelo Maria Taglietti
Website
Guest Editor
Università di Pavia, Dipartimento di Chimica – Sezione Chimica Generale, Viale Taramelli 12, I-27100 Pavia, Italy
Interests: antibacterial nanomaterials and surfaces; anisotropic noble metal nanoparticles for functionalization and application to biomedical and sensing problems and use in surface-enhanced Raman spectroscopy (SERS); theranostic devices; supramolecular chemistry; transition metal complexes
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Special Issue Information

Dear Colleagues,

Nobel metal nanoparticles are one of the most widely used classes of nanomaterials, due to the large range of unique peculiarities. Their intrinsic stability and biocompatibility, merged with optical, electromagnetic, and catalytic properties, have paved to way to an amazing variety of applications. Their shape, size, and surface characteristics can be varied using a plethora of different approaches, allowing the modulation of properties (for example the localized surface plasmon resonance, LSPR), and, most importantly, the introduction of several advanced functions, so that today, these nano-objects deserve a preeminent position in the nanotechnology toolbox.

This Special Issue will accept outstanding contributions on systems based on noble metal nanoparticles possessing advanced functions, covering areas ranging from chemistry to biology, materials science, pharmacology, and nanomedicine, and hopefully reaching the widest audience possible. We will accept, after a solid peer review process, papers (original research or reviews) in which the use of these nano-objects is planned and demonstrated on solid experimental bases.

As a non-exhaustive list of subjects and applications of interest, we can cite: catalysis, light harvesting and photocatalysis, core–shell and hybrid systems, antibacterial materials, drug delivery systems, theranostic devices, photothermal effects and photodynamic therapies, and sensing and imaging exploiting plasmonic features (LSPR and SERS).

Prof. Angelo Maria Taglietti
Guest Editor

Manuscript Submission Information

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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 monthly 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 2200 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

  • Plasmonic nanoparticles
  • Theranostic devices
  • Nanomedicine
  • Photo-thermal effects
  • Biosensing
  • Sensing
  • Imaging
  • Surface-enhanced Raman Spectroscopy
  • Silver nanoparticles
  • Gold nanoparticles
  • Platinum nanoparticles
  • Core–shell nanoparticles
  • Photocatalysis
  • Catalysis
  • Antibacterial nanoparticles

Published Papers (6 papers)

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Research

Open AccessArticle
Bonding of Gold Nanoclusters on Graphene with and without Point Defects
Nanomaterials 2020, 10(11), 2109; https://doi.org/10.3390/nano10112109 - 23 Oct 2020
Abstract
Hybrid nanostructures of size-selected nanoparticles (NPs) and 2D materials exhibit striking physical and chemical properties and are attractive for many technology applications. A major issue for the performance of these applications is device stability. In this work, we investigate the bonding of cuboctahedral, [...] Read more.
Hybrid nanostructures of size-selected nanoparticles (NPs) and 2D materials exhibit striking physical and chemical properties and are attractive for many technology applications. A major issue for the performance of these applications is device stability. In this work, we investigate the bonding of cuboctahedral, decahedral and icosahedral Au NPs comprising 561 atoms on graphene sheets via 103-atom scale ab initio spin-polarized calculations. Two distinct cases we considered: (i) the Au NPs sit with their (111) facets on graphene and (ii) the NPs are oriented with a vertex on graphene. In both cases, we compare the binding energies with and without a graphene vacancy under the NP. We find that in all cases, the presence of the graphene vacancy enhances the bonding of the NPs. Significantly, in the vertex-on-graphene case, the binding energy is considerably increased by several eVs and becomes similar to the (111) facet-on-graphene case. The strain in the NPs is found to be minimal and the displacement of the carbon atoms in the immediate neighborhood of the vacancy is on the 0.1 Å scale. The work suggests the creation of stable NP-graphene systems for a variety of electronic, chemical and photonic applications. Full article
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
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Open AccessArticle
Synthesis, Electrocatalytic and Gas Transport Characteristics of Pentagonally Structured Star-Shaped Nanocrystallites of Pd-Ag
Nanomaterials 2020, 10(10), 2081; https://doi.org/10.3390/nano10102081 - 21 Oct 2020
Cited by 1
Abstract
The method of synthesis of bimetallic Pd–Ag pentagonally structured catalyst “nanostar” on the surface of Pd-23%Ag alloy films has been developed. The resulting catalyst was studied as a highly active functional layer for methanol oxidation reaction (MOR) in alkaline media and the intensification [...] Read more.
The method of synthesis of bimetallic Pd–Ag pentagonally structured catalyst “nanostar” on the surface of Pd-23%Ag alloy films has been developed. The resulting catalyst was studied as a highly active functional layer for methanol oxidation reaction (MOR) in alkaline media and the intensification of hydrogen transport through the Pd-23%Ag membrane in the processes of hydrogen diffusion purification. A modifying layer with a controlled size, composition and excellent electrocatalytic activity was synthesized by electrochemical deposition at a reduced current density compared to classical methods. The low deposition rate affects the formation of pentagonally structured nanocrystallites, allowing Pd and Ag particles to form well-defined structures due to the properties of the surfactant used. Electrochemical studies have demonstrated that the catalyst synthesized by the “nanostar” method shows better electrocatalytic activity in relation to MOR and demonstrates a higher peak current (up to 17.82 µA cm−2) in comparison with one for the catalyst synthesized by the “nanoparticle” method (up to 10.66 µA cm−2) in a cyclic voltammetric study. The nanostar catalyst electrode releases the highest current density (0.25 µA cm−2) for MOR and demonstrates higher catalytic activity for the oxidation of possible intermediates such as sodium formate in MOR. In the processes of diffusion membrane purification of hydrogen, a multiple increase in the density of the penetrating flux of hydrogen through the membranes modified by the “nanostar” catalyst (up to 10.6 mmol s−1 m−2) was demonstrated in comparison with the membranes modified by the “nanoparticles” method (up to 4.49 mmol s−1 m−2). Research data may indicate that the properties of the developed pentagonally structured catalyst “nanostar” and its enhanced activity with respect to reactions involving hydrogen increase the desorption activity of the membrane, which ultimately accelerates the overall stepwise transfer of hydrogen across the membrane. Full article
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
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Open AccessArticle
Plasma-Assisted Synthesis of Platinum Nitride Nanoparticles under HPHT: Realized by Carbon-Encapsulated Ultrafine Pt Nanoparticles
Nanomaterials 2020, 10(9), 1780; https://doi.org/10.3390/nano10091780 - 09 Sep 2020
Abstract
Noble metal nitrides (NMNs) have important theoretical significance and potential application prospects due to their high bulk modulus and remarkable electrical properties. However, NMNs can only be synthesized under extreme conditions of ultrahigh pressure and temperature, and nanoscaled NMNs have not been reported. [...] Read more.
Noble metal nitrides (NMNs) have important theoretical significance and potential application prospects due to their high bulk modulus and remarkable electrical properties. However, NMNs can only be synthesized under extreme conditions of ultrahigh pressure and temperature, and nanoscaled NMNs have not been reported. In this work, as typical NMNs, PtNx nanoparticles were synthesized at 5 GPa and 750 K by the method of plasma-assisted laser-heating diamond anvil cell. The significantly reduced synthesis condition benefited from the ingenious design of the precursor and the remarkable chemical activity of the ultrafine Pt nanoparticles. This study, combining nanomaterials with high-pressure and -temperature (HPHT) techniques, provides a novel process for the preparation of NMN nanomaterials, and a new direction for the synthesis of superhard materials. Full article
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
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Open AccessArticle
Chiral Separation of rac-Propylene Oxide on Penicillamine Coated Gold NPs
Nanomaterials 2020, 10(9), 1716; https://doi.org/10.3390/nano10091716 - 30 Aug 2020
Abstract
The surfaces of chemically synthesized spherical gold NPs (Au-NPs) have been modified using chiral L- or D-penicillamine (Pen) in order to impart enantioselective adsorption properties. These chiral Au-NPs have been used to demonstrate enantioselective adsorption of racemic propylene oxide (PO) from aqueous solution. [...] Read more.
The surfaces of chemically synthesized spherical gold NPs (Au-NPs) have been modified using chiral L- or D-penicillamine (Pen) in order to impart enantioselective adsorption properties. These chiral Au-NPs have been used to demonstrate enantioselective adsorption of racemic propylene oxide (PO) from aqueous solution. In the past we have studied enantioselective adsorption of racemic PO on L- or D-cysteine (Cys)-coated Au-NPs. This prior work suggested that adsorption of PO on Cys-coated Au-NPs equilibrates within an hour. In this work, we have studied the effect of time on the enantioselective adsorption of racemic PO from solution onto chiral Pen/Au-NPs. Enantioselective adsorption of PO on chiral Pen/Au-NPs is time-dependent but reaches a steady state after ~18 h at room temperature. More importantly, L- or D-Pen/Au-NPs are shown to adsorb R- or S-PO enantiospecifically and to separate the two PO enantiomers from racemic mixtures of RS-PO. Full article
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
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Open AccessArticle
Nanocomposite Sprayed Films with Photo-Thermal Properties for Remote Bacteria Eradication
Nanomaterials 2020, 10(4), 786; https://doi.org/10.3390/nano10040786 - 20 Apr 2020
Cited by 2
Abstract
Currently there is a strong demand for novel protective materials with efficient antibacterial properties. Nanocomposite materials loaded with photo-thermally active nanoparticles can offer promising opportunities due to the local increase of temperature upon near-infrared (NIR) light exposure capable of eradicating bacteria. In this [...] Read more.
Currently there is a strong demand for novel protective materials with efficient antibacterial properties. Nanocomposite materials loaded with photo-thermally active nanoparticles can offer promising opportunities due to the local increase of temperature upon near-infrared (NIR) light exposure capable of eradicating bacteria. In this work, we fabricated antibacterial films obtained by spraying on glass slides aqueous solutions of polymers, containing highly photo-thermally active gold nanostars (GNS) or Prussian Blue (PB) nanoparticles. Under NIR light irradiation with low intensities (0.35 W/cm2) these films demonstrated a pronounced photo-thermal effect: ΔTmax up to 26.4 °C for the GNS-containing films and ΔTmax up to 45.8 °C for the PB-containing films. In the latter case, such a local temperature increase demonstrated a remarkable effect on a Gram-negative strain (P. aeruginosa) killing (84% of dead bacteria), and a promising effect on a Gram-positive strain (S. aureus) eradication (69% of dead bacteria). The fabricated films are promising prototypes for further development of lightweight surfaces with efficient antibacterial action that can be remotely activated on demand. Full article
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
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Open AccessArticle
Facile and Green Fabrication of Carrageenan-Silver Nanoparticles for Colorimetric Determination of Cu2+ and S2−
Nanomaterials 2020, 10(1), 83; https://doi.org/10.3390/nano10010083 - 01 Jan 2020
Cited by 6
Abstract
In the present work, silver nanoparticles (AgNPs) were prepared by a simple and green method using carrageenan as reducing and capping agent. The as-synthesized carrageenan-AgNPs was demonstrated as an effective duel colorimetric sensing for selective and sensitive recognition of Cu2+ and S [...] Read more.
In the present work, silver nanoparticles (AgNPs) were prepared by a simple and green method using carrageenan as reducing and capping agent. The as-synthesized carrageenan-AgNPs was demonstrated as an effective duel colorimetric sensing for selective and sensitive recognition of Cu2+ and S2−, which could be used to detect these ions with naked eyes. In addition, the possible sensing mechanism was that Cu2+ ions caused serious aggregation of carrageenan-AgNPs, which led to the color change of carrageenan-AgNPs. AgNPs were etched by S2− forming Ag2S, which played an important role in the determination of S2− ions. Furthermore, it has been successfully applied to the determination of Cu2+ and S2− in tap water and lake water, showing its great potential for the analysis of environmental water samples. Full article
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
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