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Search for "Ag" in Full Text gives 586 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Fabrication of nanocrystal forms of ᴅ-cycloserine and their application for transdermal and enteric drug delivery systems
Beilstein J. Nanotechnol. 2024, 15, 465–474, doi:10.3762/bjnano.15.42
- absorber [20]. In addition, silver (Ag) nanoparticles were synthesized from cotton fabrics and exhibited strong inhibition activity against some bacteria [21]. Recently, pure active pharmaceutical ingredient (API) composed of nanocrystals was investigated, as opposed to drug nanocarrier platforms [22
Heat-induced morphological changes in silver nanowires deposited on a patterned silicon substrate
Beilstein J. Nanotechnol. 2024, 15, 435–446, doi:10.3762/bjnano.15.39
- , and characterization of such materials [9][10]. Silver NWs are among the most extensively studied materials for NW-based transparent electrodes. High-quality Ag NWs can be synthesized relatively easily in large quantities, with precise control over their length and diameter [11][12]. Compared to
- indium tin oxide (ITO), which currently serves as the industry standard for transparent conductive films, the Ag NW network is significantly more mechanically flexible and offers a broader optical transmittance range that extends well beyond the visible region [13][14]. Another related application of Ag
- NW networks is in highly flexible transparent film heaters [15]. In recent years, Ag NWs have garnered attention as a key element in neuromorphic computing devices [16]. In the context of the applications mentioned, Ag NWs are subjected to elevated temperatures caused by Joule heating [17]. Moreover
Potential of a deep eutectic solvent in silver nanoparticle fabrication for antibiotic residue detection
Beilstein J. Nanotechnol. 2024, 15, 426–434, doi:10.3762/bjnano.15.38
- (Ag NPs), but the potential of DESs in Ag NP synthesis was neither considered nor studied carefully. In this study, we present a novel strategy to fabricate Ag NPs in a DES (Ag NPs-DES). The DES composed of ᴅ-glucose, urea, and glycerol does not contain any anions to precipitate with Ag+ cations. Our
- Ag NPs-DES sample is used in a surface-enhanced Raman scattering (SERS) sensor. The two analytes for SERS quantitation are nitrofurantoin (NFT) and sulfadiazine (SDZ) whose residues can be traced down to 10−8 M. The highest enhancement factors (EFs) are competitive at 6.29 × 107 and 1.69 × 107 for
- synthesis of nanomaterials for biosensor substrate construction. Keywords: Ag NPs; antibiotic residue; deep eutectic solvents; potential; SERS; Introduction Surface-enhanced Raman scattering (SERS) is a ubiquitous technology for detecting and tracing substances, applied in various kinds of sensors. The
Unveiling the nature of atomic defects in graphene on a metal surface
Beilstein J. Nanotechnol. 2024, 15, 416–425, doi:10.3762/bjnano.15.37
- similar conclusion was inferred from spatially resolved force spectroscopy across a phthalocyanine molecule on Ag(111) whose pyrrolic H atoms had been removed. Despite the bonds formed by the H-detached N atoms of the molecule with the metal substrate, an increased reactivity was reported [58]. Intact
Classification and application of metal-based nanoantioxidants in medicine and healthcare
Beilstein J. Nanotechnol. 2024, 15, 396–415, doi:10.3762/bjnano.15.36
- treatments. Recently, Wang et al. developed multifunctional Au/Ag nanodots (Au/AgNDs) as “pilot light” for real-time guided surgery (Figure 5) [170]. The authors proved that Au/AgNDs enhanced the deposition of ionizing radiation energy, increased intracellular ROS generation, and significantly improved
Controllable physicochemical properties of WOx thin films grown under glancing angle
Beilstein J. Nanotechnol. 2024, 15, 350–359, doi:10.3762/bjnano.15.31
- heterostructures were performed by preparing Ag electrodes (1 mm diameter) on top of the WOx films and p-Si substrates. The I–V data were acquired by applying DC voltage sweeps (−1 V→0 V→+1 V) using a Keithley source meter (Model 2400, Tektronix, USA) in a sandwiched configuration. During the measurements, the
- regarded as an interlayer between the p-Si substrate and the Ag electrode. The glancing angle (87°) growth of a 6 nm film is likely to sustain a large number of metal (Ag)-induced gap states at the NS-WOx/p-Si interface, leading to Fermi level pinning, the degree of pinning being directly related to film
Multiscale modelling of biomolecular corona formation on metallic surfaces
Beilstein J. Nanotechnol. 2024, 15, 215–229, doi:10.3762/bjnano.15.21
- each selected protein immobilized on different fcc planes of the aluminum surface. These heatmaps for individual proteins are acquired through UnitedAtom (UA) simulations [24][25]. While the UA method has been parameterized for a range of rigid surfaces, including metals (Ag, Au, Cu, and Fe), oxides
New application of bimetallic Ag/Pt nanoplates in a colorimetric biosensor for specific detection of E. coli in water
Beilstein J. Nanotechnol. 2024, 15, 95–103, doi:10.3762/bjnano.15.9
- detection is described using a silver/platinum nanoplate (Ag/Pt NPL) that interacts with an oligonucleotide aptamer as a bioreceptor. The size of the Ag/Pt NPLs was about 42 nm according to the FE-SEM images. The EDS result indicates that a thin layer of Pt ions was coated on the surface of the Ag NPLs
- . This nanobiosensor has the ability to specifically bind to E. coli, increasing the peroxidase activity of the apt-Ag/Pt NPL. Finally, the blue color of the solution in the contaminated water samples was increased in the presence of 3,3′,5,5′-tetramethylbenzidine (TMB) as a substrate and H2O2. The assay
- nanoparticles (i.e., silver nanoplates, Ag NPLs) covered with a layer of Pt atoms to improve the peroxide activity of NPLs, and use them as colorimetric biosensor materials. Metallic NPLs were employed in a variety of applications, including antibacterial activity [17][18][19], hazardous dye removal [20
Study of the reusability and stability of nylon nanofibres as an antibody immobilisation surface
Beilstein J. Nanotechnol. 2024, 15, 83–94, doi:10.3762/bjnano.15.8
- and Discussion Results of nanofibre reusability study High-salinity antigen/antibody (Ag/Ac) elution buffer pH 6.6 as stripping agent A commercial Ag/Ac elution buffer pH 6.6 with high salinity was able to remove almost all antibody fixed on the nanofibres through protein A/G (88.6%). The retained
- immunocapture system (15.5% compared to the total antibody fixed in group 1 (Figure 1). Hence, it seems that commercial Ag/Ac elution buffer pH 6.6 with high salt content damages the nylon nanofibers, thereby altering their immunocapture ability. Having studied how the amount of immobilised antibody was
- immunocaptured in this group (group 6) compared to group 1 (Figure 1 and Figure 2). Ammonium hydroxide buffer pH 11 as stripping agent Ammonium hydroxide buffer pH 11 gave similar results to the commercial high-salinity Ag/Ac elution buffer pH 6.6 (Figure 3). This treatment was able to remove almost all of the
Influence of conductive carbon and MnCo2O4 on morphological and electrical properties of hydrogels for electrochemical energy conversion
Beilstein J. Nanotechnol. 2024, 15, 57–70, doi:10.3762/bjnano.15.6
- ]. Cai et al. found some silver nanoparticles only slightly present in the skeleton of a PVA@DEL composite hydrogel [23]. Most of the Ag nanoparticles were observed in the wall of the hydrogel network. In our case, for the Hgel-MCO-cCB 1:3 sample, when the volume percentage of cCB was 17.1% (Table 3
Curcumin-loaded nanostructured systems for treatment of leishmaniasis: a review
Beilstein J. Nanotechnol. 2024, 15, 37–50, doi:10.3762/bjnano.15.4
- in the spleen of mice was around 60% for free-UA and close to 90% for NLC-UA. Confocal microscopy images proved the cell uptake of NLC into macrophages. Metal nanoparticles are also excellent alternatives for carrying antileishmanial drugs [71]. Almayouf et al. produced silver nanoparticles (Ag-NP
- in female Balb/c mice [72]. The results of the study showed an improvement in skin lesions of groups treated with Ag-NP both before and after infection. The group treated after infection displayed a significant decrease in lesion size starting in the second week of treatment, with complete healing
- infected with L. major was also significantly reduced compared to the negative control. Hence, it is noteworthy that both MNPs had an impact on cutaneous leishmaniasis infections. However, there was no influence of metal (Ag or Au) particles on the leishmanicidal activity of the systems. In these studies
A visible-light photodetector based on heterojunctions between CuO nanoparticles and ZnO nanorods
Beilstein J. Nanotechnol. 2023, 14, 1018–1027, doi:10.3762/bjnano.14.84
- properties of ZnO nanostructures, such as bandgap or conductivity [26]. Decorating ZnO with metals such as Ag, Au, Pd, Pt, and Al [27][28] can provide surface plasmonic effects that assist the electron transfer process in materials and extend the light absorption range of a photodetector [29][30]. However
- relations under reverse and bias voltages, indicating a good ohmic contact between semiconductor materials and Ag electrodes [42]. It is worth noting that the current rise corresponds to the light intensity increase. The highest photocurrent reached 18 μA under a light illumination of 1.28 mW·cm−2. The low
- , increasing the visible-light intensity promotes more excited electrons in the conduction band (CB) of CuO NPs. These electrons transfer to the CB of ZnO NRs and increase the photocurrent collected by the Ag electrodes. Response time and recovery are essential when evaluating a photodetector’s performance
Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays
Beilstein J. Nanotechnol. 2023, 14, 988–1003, doi:10.3762/bjnano.14.82
- properties, that is, plasmonic materials (e.g., Au, Ag, and Pt), semiconductor materials (e.g., transition metal oxides, transition metal chalcogenides, and transition metal dichalcogenides), carbon-based nanomaterials (such as graphene oxide and carbon nanotubes), and polymer nanomaterials [33][34] (Figure
- LSPR effect highly depends on size, shape, composition, interparticle distance, dielectric constant, and surrounding medium of the particles [36][37]. While Pt, Ag, and Au particles all exhibit photothermal properties, Au nanoparticles are commonly used for photothermal applications. By changing the
- material [75]. For example, nanocomposite materials have been developed by combining noble metal nanoparticles (Au–Ag, Au–Pt, and Au–Ag–Pt) or hybrids of noble metals, metals, and/or carbon materials (Au–Fe, Au–carbon, and Au–Fe–carbon). The resultant nanocomposites exhibit properties of all constituents
Ni, Co, Zn, and Cu metal-organic framework-based nanomaterials for electrochemical reduction of CO2: A review
Beilstein J. Nanotechnol. 2023, 14, 904–911, doi:10.3762/bjnano.14.74
- exhibited considerable variation depending on the elemental composition of pure metal catalysts [19]. Notably, Au, Ag, and Zn catalysts exhibit preferential CO generation, while Sn, In, and Pb catalysts prove effective in producing formate ions (HCOO−) [20]. Metal-organic frameworks (MOFs) are established
N-Heterocyclic carbene-based gold etchants
Beilstein J. Nanotechnol. 2023, 14, 865–871, doi:10.3762/bjnano.14.71
- without the need for Au/Ag alloys. Porous gold, itself, provides a gold film with high surface area that can be advantageous for energy conversion, catalysis, and electrochemical sensing [9][31]. Experimental Compounds 1 and 3 were prepared based on previously reported work [15][19], with 3 prepared by
Silver-based SERS substrates fabricated using a 3D printed microfluidic device
Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65
- tool for detecting ultralow concentrations of chemical compounds and biomolecules. We present a reproducible method for producing Ag nanoparticles that can be used to create highly sensitive SERS substrates. A microfluidic device was employed to confine the precursor reagents within the droplets
- , resulting in Ag nanoparticles of uniform shape and size. The study investigates the effects of various synthesis conditions on the size distribution, dispersity, and localized surface plasmon resonance wavelength of the Ag nanoparticles. To create the SERS substrate, the as-synthesized Ag nanoparticles were
- catalytic chemistry, where they have been used to develop localized surface plasmon resonance (LSPR) and SERS substrates [8]. For example, Ag NPs yield a strong SERS effect at relatively low cost. However, an issue often encountered in synthetic approaches is the non-uniformity of the Ag NPs. Homogeneous Ag
Silver nanoparticles loaded on lactose/alginate: in situ synthesis, catalytic degradation, and pH-dependent antibacterial activity
Beilstein J. Nanotechnol. 2023, 14, 781–792, doi:10.3762/bjnano.14.64
- that disrupts the cross-linking between Ca2+ ions and COO− groups of sugar molecules in the alginate chains, leading to the formation of soluble nanoparticles (Figure 1). To obtain the nanocomposite AgNPs@Lac/Alg, Ag+@Lac/Alg was reduced through a heating process, without the use of additional
- additives. The formation of AgNPs was confirmed by a change in the color of the colloidal solution. To find the optimal reaction conditions, the synthesis of the nanocomposite was carried out while varying the reaction conditions, such as temperature, reaction time, and ratio of Ag+ to blank composite
- , as evidenced by the absence of any notable change in λmax values. To investigate the influence of the reaction time, the gel Ag+@Lac/Alg was heated at a solution temperature of 90 °C and the UV–vis spectra were measured every 20 min. As seen in Figure 2C and Figure 2D, the formation of AgNPs in the
A graphene quantum dots–glassy carbon electrode-based electrochemical sensor for monitoring malathion
Beilstein J. Nanotechnol. 2023, 14, 701–710, doi:10.3762/bjnano.14.56
- obtained from a Bruker AFM analyzer atomic force microscope and a FEI Tecnai G2 20 S-TWIN transmission electron microscope. Electrochemical measurements GQDs/GCE, Ag/AgCl, and a platinum wire were used as working, reference, and counter electrode, respectively, in all electrochemical experiments, conducted
Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review
Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52
- improved electrochemical performance [63][67]. In a recent study, Tang et al. [29] used an ultrasonication and reduction process to combine nanostructured Ag nanoparticles with a MOF (ZIF-67) to fabricate nanopinna-based composite electrochemical sensors for acetaminophen detection. The results showed a
- wide linear detection range with a detection limit of 0.05 μM. Due to the synergistic effects of the wide porosity and high specific surface area of the MOF and the outstanding catalytic activity and high conductivity of Ag nanoparticles, the hybridisation improved the electrochemical performance of
SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms
Beilstein J. Nanotechnol. 2023, 14, 552–564, doi:10.3762/bjnano.14.46
- University of Technology, gen. Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland Institute of Optoelectronics, Military University of Technology, gen. Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland 10.3762/bjnano.14.46 Abstract The results of comparative studies on the fabrication and characterization of GaN/Ag
- substrates using pulsed laser deposition (PLD) and magnetron sputtering (MS) and their evaluation as potential substrates for surface-enhanced Raman spectroscopy (SERS) are reported. Ag layers of comparable thicknesses were deposited using PLD and MS on nanostructured GaN platforms. All fabricated SERS
- substrates were examined regarding their optical properties using UV–vis spectroscopy and regarding their morphology using scanning electron microscopy. SERS properties of the fabricated GaN/Ag substrates were evaluated by measuring SERS spectra of 4-mercaptobenzoic acid molecules adsorbed on them. For all
Molecular nanoarchitectonics: unification of nanotechnology and molecular/materials science
Beilstein J. Nanotechnol. 2023, 14, 434–453, doi:10.3762/bjnano.14.35
- nanoribbons. Molecular nanoarchitectonics is an approach with great potential. Orita, Kawai, and co-workers demonstrated controlled synthesis of conjugated oligomers by chemoselective Sonogashira coupling between (trimethylsilyl)ethynyl and chlorophenyl groups on Ag(111) (Figure 6) [119]. In this reaction
- 5,10,15,20-tetra(4-ethynylphenyl)porphyrin molecules (Figure 12) [129]. The reaction mode changes depending on the substrate. Alkyne–alkyne cyclic dimerization is the dominant reaction pathway on Au(111), while Glaser coupling and nonhydrogenic head-to-head coupling are the dominant reaction pathways on Ag
- (111). In the reaction n Ag(111), the molecules are alternately arranged and tightly packed. Rectangular and elliptical pores exist between adjacent molecular rows. Reactions occurred first in the rectangular pores. This is because the possible reaction pathways are greatly reduced in the two
Evaluation of electrosynthesized reduced graphene oxide–Ni/Fe/Co-based (oxy)hydroxide catalysts towards the oxygen evolution reaction
Beilstein J. Nanotechnol. 2023, 14, 420–433, doi:10.3762/bjnano.14.34
- was the structure of NiFe and the electroactive surface area of GO. Experimental Fabrication of the catalysts NiFe and CoNiFe oxides/(oxy)hydroxides were synthesized in a one-step process by electrodeposition at −1.1 V vs Ag/AgCl in an aqueous solution of 4 mM nickel(II) nitrate hexahydrate (Ni(NO3)2
- vs Ag/AgCl in an aqueous solution of 4.4 mg∙mL−1 GO (Graphene Supermarket) at 25 °C; (2) electrodeposition of NiFe or CoNiFe carried out at −1.1 V vs Ag/AgCl in an aqueous solution of 4 mM Ni(NO3)2·6H2O, 4 mM Fe(NO3)3·6H2O, and 0 or 2 mM Co(NO3)2·6H2O at 25 °C. Unless otherwise stated, the deposition
- , the substrates were cleaned ultrasonically in distilled water (5 min) and acetone (5 min). The reference and counter electrodes were Ag/AgCl (4 M KCl) and platinum mesh, respectively. Distilled water was used for the solutions. The measurement temperature was controlled by a thermostat (Julabo F12
Plasmonic nanotechnology for photothermal applications – an evaluation
Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33
- . When the energy of the photons is greater than the bandgap, interband transitions are observed. As an example of the energies at which interband transitions [28] occur, Cu, Au, Ag exhibit them at 2.25, 2.4, and 4 eV, respectively, and threshold energy levels of interband transitions are 1.6–1.8 eV for
- Cu, Au, and Al, as well as 3.5 eV for Ag [29]. Concerning PT applications, radiative transitions such as luminescence and scattering imply inefficiency, as this scattered energy is not converted to heat. Hot electron generation and subsequent thermalization are consequences of SPR absorption that can
- , Ag, and Cu, with high densities of free electrons exhibit plasmon resonances in the visible region suitable for PT applications [30]. The subsequent part of this review highlights the parameters that influence various properties of plasmonic materials relevant to PT energy conversion. We first derive
New trends in nanobiotechnology
Beilstein J. Nanotechnol. 2023, 14, 377–379, doi:10.3762/bjnano.14.32
- infection caused by SARS-CoV-2. Another important topic covered in this thematic issue is presented in this article: “In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles” [7]. This work explores the use of pineapple waste for the synthesis of silver and
Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities
Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31
- characterization of quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles (Ch/Q- and Ch/CA-Ag NPs), and their antibacterial and anticancer activities. The formation of Ch/Q- and Ch/CA-Ag NPs has been confirmed by ultraviolet–visible (UV–vis) spectroscopy, Fourier-transform
- infrared (FTIR) spectroscopy, and transmission electron microscopy (TEM). The characteristic surface plasmon resonance (SPR) absorption band has been found at 417 and 424 nm for Ch/Q- and Ch/CA-Ag NPs, respectively. The formation of a chitosan shell comprising quercetin and caffeic acid, which surround the
- colloidal core Ag NPs, was confirmed by UV–vis, and FTIR analyses, and monitored by TEM microscopy. The size of nanoparticles has been determined as 11.2 and 10.3 nm for Ch/Q- and Ch/CA-Ag, respectively. The anticancer activity of Ch/Q- and Ch/CA-Ag NPs has been evaluated against U-118 MG (human
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