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Search for "silver nanoparticles" in Full Text gives 136 result(s) in Beilstein Journal of Nanotechnology.

Evolution of Ag nanostructures created from thin films: UV–vis absorption and its theoretical predictions

  • Robert Kozioł,
  • Marcin Łapiński,
  • Paweł Syty,
  • Damian Koszelow,
  • Wojciech Sadowski,
  • Józef E. Sienkiewicz and
  • Barbara Kościelska

Beilstein J. Nanotechnol. 2020, 11, 494–507, doi:10.3762/bjnano.11.40

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  • three-dimensional simulation of electromagnetic field propagation through a selected sample (thickness 7 nm, annealed at 550 °C for 15 min) was performed using the FDTD method [14], implemented in the OmniSim package, produced by Photon Design, UK. Positions and sizes of the silver nanoparticles
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Published 25 Mar 2020

Nanoparticles based on the zwitterionic pillar[5]arene and Ag+: synthesis, self-assembly and cytotoxicity in the human lung cancer cell line A549

  • Dmitriy N. Shurpik,
  • Denis A. Sevastyanov,
  • Pavel V. Zelenikhin,
  • Pavel L. Padnya,
  • Vladimir G. Evtugyn,
  • Yuriy N. Osin and
  • Ivan I. Stoikov

Beilstein J. Nanotechnol. 2020, 11, 421–431, doi:10.3762/bjnano.11.33

Graphical Abstract
  • thousands of years, the use of this metal has grown into an entire industry [1]. A separate area of this industry is the use of silver nanoparticles (AgNPs), which are the source of Ag+ ions in many commercial products, such as food packaging, odor-resistant fabrics, household appliances and medical devices
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Published 05 Mar 2020

Gold and silver dichroic nanocomposite in the quest for 3D printing the Lycurgus cup

  • Lars Kool,
  • Floris Dekker,
  • Anton Bunschoten,
  • Glen J. Smales,
  • Brian R. Pauw,
  • Aldrik H. Velders and
  • Vittorio Saggiomo

Beilstein J. Nanotechnol. 2020, 11, 16–23, doi:10.3762/bjnano.11.2

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  • nanoparticles present in the glass. In this research we show the synthesis of dichroic silver nanoparticles and their embedding in a 3D printable nanocomposite. The addition of gold nanoparticles to the silver nanoparticle composite, gave a 3D printable nanocomposite with the same dichroism effect of the
  • scientists for centuries, was discovered to be due to the presence of nanoparticles in the glass. This effect was due to two different metallic nanoparticles: silver nanoparticles (AgNP) and gold nanoparticles (AuNP). While the latters are responsible for the red plasmonic colour, the silver nanoparticles
  • variations, we found that reducing silver ions at room temperature immediately followed by an addition of a polyvinylpyrrolidone (PVP) solution formed dichroic silver nanoparticles in minutes. The addition of the reducing agent (NaBH4) to a silver nitrate solution forms nanoclusters, and the immediate
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Published 02 Jan 2020

Advanced hybrid nanomaterials

  • Andreas Taubert,
  • Fabrice Leroux,
  • Pierre Rabu and
  • Verónica de Zea Bermudez

Beilstein J. Nanotechnol. 2019, 10, 2563–2567, doi:10.3762/bjnano.10.247

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  • electronic devices” [29]. A combination of deposition techniques was used, chemical vapor deposition for parylene and RF-magnetron sputtering for silver nanoparticles. The content and size of the latter influences the dielectric characteristics of the resulting hybrid films. Such devices may find application
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Published 20 Dec 2019

Label-free highly sensitive probe detection with novel hierarchical SERS substrates fabricated by nanoindentation and chemical reaction methods

  • Jingran Zhang,
  • Tianqi Jia,
  • Yongda Yan,
  • Li Wang,
  • Peng Miao,
  • Yimin Han,
  • Xinming Zhang,
  • Guangfeng Shi,
  • Yanquan Geng,
  • Zhankun Weng,
  • Daniel Laipple and
  • Zuobin Wang

Beilstein J. Nanotechnol. 2019, 10, 2483–2496, doi:10.3762/bjnano.10.239

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  • on the Cu(110) plane by changing the period of the force signal and the machining feed. Ag nanoparticles were generated via redox on the cavities and pile-up of the Cu(110) surface. Different structures of silver nanoparticles and copper surfaces can be produced by changing the corrosion time, and
  • V/m. The electric field intensity of a single silver particle in contact with the pile-up structure is increased by a factor of about three versus the individual silver nanoparticles on the copper surface. Figure 10b shows the electric field distribution of the hierarchical structures with a pile-up
  • surface of single crystal copper. Compared with the single crystal copper surface, the internal cavities and pile-ups of cavities are more easily etched by AgNO3 solution. Therefore, the stress state affects the corrosion structure. Compared with the single crystal copper surface, more silver
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Published 13 Dec 2019

The role of Ag+, Ca2+, Pb2+ and Al3+ adions in the SERS turn-on effect of anionic analytes

  • Stefania D. Iancu,
  • Andrei Stefancu,
  • Vlad Moisoiu,
  • Loredana F. Leopold and
  • Nicolae Leopold

Beilstein J. Nanotechnol. 2019, 10, 2338–2345, doi:10.3762/bjnano.10.224

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  • uric acid, salicylic acid and fumaric acid could be recorded at a concentration of 50 µM only after activation of the colloidal silver nanoparticles by Ca2+, Pb2+ or Al3+ (50 µM). The chemisorption of the three anionic species to the silver surface occurs competitively and is enhanced with the anions
  • . In the present study, we show that SERS spectra of anionic analytes can be obtained in the micromolar concentration range, by activating the AgNPs with cationic adions. Switch-on of the citrate capping agent SERS spectrum For this study we chose citrate-capped silver nanoparticles (cit-AgNPs) since
  • acids is enhanced for the anions of higher affinities to the silver surface. More precisely, the following affinity order was observed: citrate < fumaric acid < salicylic acid < uric acid. Materials and Methods Synthesis of the citrate-capped silver nanoparticles (cit-AgNPs). All reagents were of
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Published 27 Nov 2019

Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules

  • William W. Bryan,
  • Riddhiman Medhi,
  • Maria D. Marquez,
  • Supparesk Rittikulsittichai,
  • Michael Tran and
  • T. Randall Lee

Beilstein J. Nanotechnol. 2019, 10, 1973–1982, doi:10.3762/bjnano.10.194

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  • hydrogel and polymer nanocomposites with silver nanoparticles [70][71][72][73]. However, to the best of our knowledge, there have been no reports of NIR-active porous silver nanocapsules containing thermo-responsive hydrogel (or any kind of polymer) cores. The methods described herein illustrate the
  • existence of discontinuous nanocapsules; that is, there are multiple silver nanoparticles surrounding the hydrogel cores in these samples. The appearance of the extinction maximum for the complete silver nanocapsules at ≈950–1050 nm is consistent with that of a complete nanoshell [51][92][93]. The
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Published 04 Oct 2019

Toxicity and safety study of silver and gold nanoparticles functionalized with cysteine and glutathione

  • Barbara Pem,
  • Igor M. Pongrac,
  • Lea Ulm,
  • Ivan Pavičić,
  • Valerije Vrček,
  • Darija Domazet Jurašin,
  • Marija Ljubojević,
  • Adela Krivohlavek and
  • Ivana Vinković Vrček

Beilstein J. Nanotechnol. 2019, 10, 1802–1817, doi:10.3762/bjnano.10.175

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  • Zagreb, Croatia 10.3762/bjnano.10.175 Abstract This study was designed to evaluate the nano–bio interactions between endogenous biothiols (cysteine and glutathione) with biomedically relevant, metallic nanoparticles (silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs)), in order to assess the
  • -chemical properties. Silver nanoparticles (AgNPs) are extensively used in antimicrobial coatings for medical devices, wound dressing, cosmetic products and food packaging due to their antimicrobial, antiangiogenic and anti-inflammatory properties [1][2][3][4][5]. Biomedical applications of gold
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Published 02 Sep 2019

A silver-nanoparticle/cellulose-nanofiber composite as a highly effective substrate for surface-enhanced Raman spectroscopy

  • Yongxin Lu,
  • Yan Luo,
  • Zehao Lin and
  • Jianguo Huang

Beilstein J. Nanotechnol. 2019, 10, 1270–1279, doi:10.3762/bjnano.10.126

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  • Raman scattering (SERS) substrate was developed by facile deposition of silver nanoparticles onto cellulose fibers of ordinary laboratory filter paper. This was achieved by means of the silver mirror reaction in a manner to control both the size of the silver nanoparticles and the silver density of the
  • substrate. This paper-based substrate is composed of a particle-on-fiber structure with the unique three-dimensional network morphology of the cellulose matrix. For such a SERS substrate with optimized size of the silver nanoparticles (ca. 70 nm) and loading density of silver (17.28 wt %), a remarkable
  • composed of silver nanoparticles anchored on cellulose nanofibers was fabricated, which is shown to be a highly effective substrate for surface-enhanced Raman spectroscopy (SERS). SERS, a powerful molecular spectroscopy method, is widely used in the trace detection and characterization of various chemical
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Published 24 Jun 2019

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

  • Malwina Liszewska,
  • Bogusław Budner,
  • Małgorzata Norek,
  • Bartłomiej J. Jankiewicz and
  • Piotr Nyga

Beilstein J. Nanotechnol. 2019, 10, 1048–1055, doi:10.3762/bjnano.10.105

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  • corresponds to LSPR of isolated silver nanoparticles. With increased silver coverage the absorption peak broadens and shifts to longer wavelengths (samples B–E). Sample F has almost wavelength independent absorption (as well as transmittance and reflectance). Such behavior is known for metal films close to
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Published 15 May 2019

Enhanced inhibition of influenza virus infection by peptide–noble-metal nanoparticle conjugates

  • Zaid K. Alghrair,
  • David G. Fernig and
  • Bahram Ebrahimi

Beilstein J. Nanotechnol. 2019, 10, 1038–1047, doi:10.3762/bjnano.10.104

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  • a mixed-matrix ligand shell of a peptidol and an alkanethiol ethylene glycol consisting of 70% CVVVTol and 30% HS(CH2)11(OC2H4)4OH (mol/mol). Gold and silver nanoparticles (ca. 10 nm diameter) with up to 5% (mol/mol) FluPep ligand remained as stable as the control of mixed-matrix-passivated
  • demonstrate that conjugation of FluPep to gold and silver nanoparticles enhances its antiviral potency; the antimicrobial activity of silver ions may enable the design of even more potent antimicrobial inhibitors, capable of targeting both influenza and bacterial co-infections. Keywords: antiviral peptides
  • ; gold nanoparticles; influenza virus; lytic infection; silver nanoparticles; Introduction The influenza (“flu”) type-A virus is a major health concern for humans and livestock animals. The primary mode of transmission is by the respiratory route. Flu infection occurs seasonally and can cause global
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Published 14 May 2019

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

  • Michael D. Ballentine,
  • Elizabeth G. Embry,
  • Marco A. Garcia and
  • Lawrence J. Hill

Beilstein J. Nanotechnol. 2019, 10, 718–724, doi:10.3762/bjnano.10.71

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  • an ionic liquid, and the effect this has on catalytic performance. Platinum, gold, and silver nanoparticles were deposited onto CdSe@CdS (core@shell) nanorods from metal salts in an ionic liquid (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) without additional surfactants or reducing
  • methylene blue. This hybrid approach using traditional organic ligands for the synthesis of well-defined nanorods followed by [bmim][Tf2N] for metal deposition was found to be applicable to other noble metals in addition to platinum. Gold and silver nanoparticles were also deposited onto CdSe@CdS nanorods
  • those previously observed using organic solvents and ligands [39][40]. We were also able to deposit silver nanoparticles onto CdSe@CdS nanorods using only [bmim][Tf2N] and AgNO3 at 50 °C (Figure 3b). Due to the lower contrast in electron microscopy of Ag compared to Au, silver deposition was conducted
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Published 14 Mar 2019

Gold nanoparticles embedded in a polymer as a 3D-printable dichroic nanocomposite material

  • Lars Kool,
  • Anton Bunschoten,
  • Aldrik H. Velders and
  • Vittorio Saggiomo

Beilstein J. Nanotechnol. 2019, 10, 442–447, doi:10.3762/bjnano.10.43

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  • due to gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs) of different sizes and shapes [9][10]. However, only the Lycurgus cup, now stored in the British Museum, and six other broken pieces showing the same dichroic effect were found worldwide, hinting that the achievement of such an optical
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Published 12 Feb 2019

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

  • Sherif Okeil and
  • Jörg J. Schneider

Beilstein J. Nanotechnol. 2018, 9, 2813–2831, doi:10.3762/bjnano.9.263

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  • obtain porous silver nanostructures [12]. Other routes include the use of gold or silver nanoparticles of different shapes in solution and their assembly on a solid substrate [6][13][14][15][16][17], nanosphere lithography [18][19][20][21][22][23][24][25] as well as nanolithography and nanoimprinting [26
  • from Abacus (Analytical Systems GmbH) consisting of silver nanoparticles on a paper substrate was used for comparison. Results and Discussion Processing and characterization of sputtered and plasma-treated silver films Radio frequency plasma is generated through exposing the feed gas to an external
  • well-known for silver nanoparticles. In case of argon plasma treatment (Figure 9c) increasing plasma treatment time results in an increase of absorption of the silver film over the whole UV–vis spectrum indicating some sort of densification of the silver film [87]. The wetting behavior was analyzed by
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Published 07 Nov 2018

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

  • Alexander Rostek,
  • Marina Breisch,
  • Kevin Pappert,
  • Kateryna Loza,
  • Marc Heggen,
  • Manfred Köller,
  • Christina Sengstock and
  • Matthias Epple

Beilstein J. Nanotechnol. 2018, 9, 2763–2774, doi:10.3762/bjnano.9.258

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  • biological effects of rhodium nanoparticles except that these nanoparticles can penetrate into human skin [32]. Silver nanoparticles are applied in various fields including healthcare and biomedicine due to their antimicrobial, antifungal and antiviral effect [33][34][35][36][37]. This is based on the
  • ][52]. This previously prompted us to carry out a multicentre study where the same silver nanoparticles were investigated in different laboratories with different biological assays [44]. Following the same approach, we have synthesized and thoroughly characterized nanoparticles of the noble metals Rh
  • reduction with sodium borohydride leads to small palladium nanoparticles (<10 nm) [65]. Silver nanoparticles can be synthesized in many different ways [66][67]. A bottom-up synthesis of silver nanoparticles can be performed either in organic solvents like ethylene glycol (EG), oleylamin (cis-1-amino-9
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Published 29 Oct 2018

Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation

  • Wei-Hung Hsu,
  • Frances Camille P. Masim,
  • Armandas Balčytis,
  • Hsin-Hui Huang,
  • Tetsu Yonezawa,
  • Aleksandr A. Kuchmizhak,
  • Saulius Juodkazis and
  • Koji Hatanaka

Beilstein J. Nanotechnol. 2018, 9, 2609–2617, doi:10.3762/bjnano.9.242

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  • with different sizes was applied for the efficient X-ray generation in an aqueous phase [17][18], and plasmonic silver nanoparticles were excited to accelerate electrons in vaccum [19]. In addition, there is another new theoretical approach on X-ray sources using plasmonic graphene [20]. Nanoparticles
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Published 01 Oct 2018

SERS active Ag–SiO2 nanoparticles obtained by laser ablation of silver in colloidal silica

  • Cristina Gellini,
  • Francesco Muniz-Miranda,
  • Alfonso Pedone and
  • Maurizio Muniz-Miranda

Beilstein J. Nanotechnol. 2018, 9, 2396–2404, doi:10.3762/bjnano.9.224

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  • of the present work is to apply laser ablation to the fabrication of new materials for surface enhanced Raman scattering (SERS) [15][16], focusing on silver and silica nanoparticles in aqueous suspension. This research was undertaken for three main reasons. The first is that silver nanoparticles that
  • silica, exhibiting suitable SERS enhancements by means of the vicinal presence of silver nanoparticles. Finally, the third reason is the use of laser ablation to obtain silver nanoparticles free of reagents and/or reaction products that could interfere in both ligand adsorption and SERS detection (as
  • laser ablation time, the growth of the plasmonic band of the silver nanoparticles in two silica suspensions, with 10 and 5 wt % SiO2 concentrations. The results appear quite similar, as shown in the Figure S2 of Supporting Information File 1. The TEM images (Figure 2) show silver nanoparticles (5–10 nm
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Published 06 Sep 2018

Surface energy of nanoparticles – influence of particle size and structure

  • Dieter Vollath,
  • Franz Dieter Fischer and
  • David Holec

Beilstein J. Nanotechnol. 2018, 9, 2265–2276, doi:10.3762/bjnano.9.211

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  • expectation of a reduced surface energy. Results for silver nanoparticles, shown by Alarifi et al. [46], demonstrate the existence of both an outer liquid layer and subsequent a quasi-liquid transition layer at the surface of nanoparticles. Even when both the quasi-liquid and the liquid layer are not
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Published 23 Aug 2018

The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement

  • Nicolae Leopold,
  • Andrei Stefancu,
  • Krisztian Herman,
  • István Sz. Tódor,
  • Stefania D. Iancu,
  • Vlad Moisoiu and
  • Loredana F. Leopold

Beilstein J. Nanotechnol. 2018, 9, 2236–2247, doi:10.3762/bjnano.9.208

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  • Medicine, Manastur 3-5, 400372 Cluj-Napoca, Romania 10.3762/bjnano.9.208 Abstract Chloride-capped silver nanoparticles (Cl-AgNPs) allow for high-intensity surface-enhanced Raman scattering (SERS) spectra of cationic molecules to be obtained (even at nanomolar concentration) and may also play a key role in
  • understanding some fundamental principles behind SERS. In this study, we describe a fast (<10 min) and simple protocol for obtaining highly SERS-active colloidal silver nanoparticles (AgNPs) with a mean diameter of 36 nm by photoconversion from AgCl precursor microparticles in the absence of any organic
  • seems to prevail over the Raman enhancement due to nanoparticle aggregation. Keywords: chloride activation; electronic coupling; photoreduction; silver nanoparticles; SERS-active sites; SERS switch-on effect; Introduction The most common surface-enhanced Raman scattering (SERS) substrate is the silver
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Published 22 Aug 2018

Fabrication of photothermally active poly(vinyl alcohol) films with gold nanostars for antibacterial applications

  • Mykola Borzenkov,
  • Maria Moros,
  • Claudia Tortiglione,
  • Serena Bertoldi,
  • Nicola Contessi,
  • Silvia Faré,
  • Angelo Taglietti,
  • Agnese D’Agostino,
  • Piersandro Pallavicini,
  • Maddalena Collini and
  • Giuseppe Chirico

Beilstein J. Nanotechnol. 2018, 9, 2040–2048, doi:10.3762/bjnano.9.193

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  • studies have reported the preparation and the antibacterial efficacy of PVA films containing plant extracts, silver nanoparticles or zinc oxide nanoparticles [17][18][19][20][21][22]. However, when bacteria start to form biofilms they become resistant and conventional antibiotics do not eradicate biofilms
  • from the surfaces where they formed [8]. Silver nanoparticles prevent biofilm formation but with a controversial results – Ag nanoparticles are effective towards Gram-negative bacterial strains but much less so towards Gram-positive [8][23]. There is a strong need for novel lightweight antibacterial
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Published 23 Jul 2018

Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film

  • Kalpana Singh,
  • Evgeniy Panchenko,
  • Babak Nasr,
  • Amelia Liu,
  • Lukas Wesemann,
  • Timothy J. Davis and
  • Ann Roberts

Beilstein J. Nanotechnol. 2018, 9, 1491–1500, doi:10.3762/bjnano.9.140

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  • of inorganic compounds such as ceramics, minerals and semiconductors [41][42][43]. CL has also been shown to be an invaluable tool in the investigation of optical modes of nanostructures [44]. These include characterising the plasmonic modes of silver nanoparticles [45] and resonant modes of single
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Published 18 May 2018

Colorimetric detection of Cu2+ based on the formation of peptide–copper complexes on silver nanoparticle surfaces

  • Gajanan Sampatrao Ghodake,
  • Surendra Krishna Shinde,
  • Rijuta Ganesh Saratale,
  • Avinash Ashok Kadam,
  • Ganesh Dattatraya Saratale,
  • Asad Syed,
  • Fuad Ameen and
  • Dae-Young Kim

Beilstein J. Nanotechnol. 2018, 9, 1414–1422, doi:10.3762/bjnano.9.134

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  • + is based on coordination reactions of Cu2+ with casein peptide-functionalized silver nanoparticles (AgNPs), leading to a distinct color change of the solution from yellow to red. The developed method has a good detection limit of about 0.16 µM Cu2+ using 0.05 mL of AgNPs stock solution and a
  • samples [13][14]. However, the use of gold and/or platinum limits the affordability of sensing probe. As exemplified in this work, cost-effective silver nanoparticles (AgNPs) having specifically modified ligands for detecting lower concentrations of Cu2+ offer a more portable and practical approach. In a
  • recorded after 20 min at 520 nm. A plot of the concentration versus absorbance intensity was prepared, and used as the standard graph for the determination of Cu2+ concentrations present in the water samples. (a) UV–vis spectrum and color of silver nanoparticles before and after centrifugation. A
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Published 15 May 2018

Electrodeposition of reduced graphene oxide with chitosan based on the coordination deposition method

  • Mingyang Liu,
  • Yanjun Chen,
  • Chaoran Qin,
  • Zheng Zhang,
  • Shuai Ma,
  • Xiuru Cai,
  • Xueqian Li and
  • Yifeng Wang

Beilstein J. Nanotechnol. 2018, 9, 1200–1210, doi:10.3762/bjnano.9.111

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  • promising for uses in surface coatings, sensors and metallic biomaterials, however, to date little attention has been paid to this coordination electrodeposition method. A feature of the chitosan electrodeposition method is that it enables a controllable means to assemble nanoparticles (e.g., silver
  • nanoparticles, carbon nanotubes, manganese oxides nanoparticles, and carbon dots) on electrodes through codeposition with chitosan, which offers attractive applications in antimicrobial coatings, biosensors, microbial fuel cells, and energy storage materials [14][15][16][17][18]. Among the studies on the
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Published 17 Apr 2018

Facile chemical routes to mesoporous silver substrates for SERS analysis

  • Elina A. Tastekova,
  • Alexander Y. Polyakov,
  • Anastasia E. Goldt,
  • Alexander V. Sidorov,
  • Alexandra A. Oshmyanskaya,
  • Irina V. Sukhorukova,
  • Dmitry V. Shtansky,
  • Wolgang Grünert and
  • Anastasia V. Grigorieva

Beilstein J. Nanotechnol. 2018, 9, 880–889, doi:10.3762/bjnano.9.82

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  • , Ruhr-University at Bochum, Universitätsstraße 150, Bochum, 44801, Germany 10.3762/bjnano.9.82 Abstract Mesoporous silver nanoparticles were easily synthesized through the bulk reduction of crystalline silver(I) oxide and used for the preparation of highly porous surface-enhanced Raman scattering (SERS
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Published 14 Mar 2018

Noble metal-modified titania with visible-light activity for the decomposition of microorganisms

  • Maya Endo,
  • Zhishun Wei,
  • Kunlei Wang,
  • Baris Karabiyik,
  • Kenta Yoshiiri,
  • Paulina Rokicka,
  • Bunsho Ohtani,
  • Agata Markowska-Szczupak and
  • Ewa Kowalska

Beilstein J. Nanotechnol. 2018, 9, 829–841, doi:10.3762/bjnano.9.77

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  • activity under visible-light irradiation, whereas the size and shape of silver nanoparticles (NPs) and the aspect ratio of titania affect the antifungal activity [29]. In the present study, antimicrobial properties of commercial titania samples modified with noble metals have been investigated in order to
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Published 07 Mar 2018
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