Electrocatalytic oxygen reduction activity of AgCoCu oxides on reduced graphene oxide in alkaline media

• Iyyappan Madakannu,
• Indrajit Patil,
• Bhalchandra Kakade and
• Kasibhatta Kumara Ramanatha Datta

Beilstein J. Nanotechnol. 2022, 13, 1020–1029, doi:10.3762/bjnano.13.89

• the oxygen reduction reaction (ORR) in alkaline medium. Varying the Ag fraction in copper cobalt oxide has a significant influence on the ORR activity. At a ratio of 2:1:1, AgCuCo oxide NPs on rGO displayed the best values for onset potential, half-wave potential, and limiting current density (Jk) of

• 0.94 V vs RHE, 0.78 V, and 3.6 mA·cm−2, respectively, with an electrochemical active surface area of 66.92 m2·g−1 and a mass activity of 40.55 mA·mg−1. The optimum electrocatalyst shows considerable electrochemical stability over 10,000 cycles in 0.1 M KOH solution. Keywords: copper cobalt oxide NPs

• electrocatalysts [14][18][19]. Oxophilicity, agglomeration, and poor chemical stability of Ag require the amalgamation of Ag with other metals for a better optical and catalytic activity [20]. Chen et al. synthesised Ag nanoscale alloys containing metals such as copper, cobalt, iron, and indium via pulse film

Influence of water contamination on the sputtering of silicon with low-energy argon ions investigated by molecular dynamics simulations

• Grégoire R. N. Defoort-Levkov,
• Alan Bahm and
• Patrick Philipp

Beilstein J. Nanotechnol. 2022, 13, 986–1003, doi:10.3762/bjnano.13.86

• MD/binary collision approximation (BCA) simulations. ReaxFF simulations can cover a broad range of applications: from DNA molecule bombardments with heavy atoms [31] to graphene layer deposition on copper surfaces [32]. Numerous simulations using the ReaxFF potential have been conducted in the past

Bioselectivity of silk protein-based materials and their bio-inspired applications

• Hendrik Bargel,
• Vanessa T. Trossmann,
• Christoph Sommer and
• Thomas Scheibel

Beilstein J. Nanotechnol. 2022, 13, 902–921, doi:10.3762/bjnano.13.81

Optimizing PMMA solutions to suppress contamination in the transfer of CVD graphene for batch production

• Chun-Da Liao,
• Andrea Capasso,
• Tiago Queirós,
• Telma Domingues,
• Fatima Cerqueira,
• Nicoleta Nicoara,
• Jérôme Borme,
• Paulo Freitas and
• Pedro Alpuim

Beilstein J. Nanotechnol. 2022, 13, 796–806, doi:10.3762/bjnano.13.70

• stability and impermeability to gases and liquids. In contrast, the surrounding exposed areas of the Cu foil surface exhibited high reactivity and were readily oxidized to copper oxides with a noticeable color change. The apparent color contrast between the oxidized and non-oxidized Cu surfaces made the

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

• Zehao Lin,
• Zhan Yang and
• Jianguo Huang

Beilstein J. Nanotechnol. 2022, 13, 745–762, doi:10.3762/bjnano.13.66

• homogeneous suspension. The suspension was then dropped onto an Al foil to be observed via field-emission scanning electron microscopy (FE-SEM), and onto a carbon-supported copper grid for examination via transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HR-TEM

Experimental and theoretical study of field-dependent spin splitting at ferromagnetic insulator–superconductor interfaces

• Peter Machon,
• Michael J. Wolf,
• Detlef Beckmann and
• Wolfgang Belzig

Beilstein J. Nanotechnol. 2022, 13, 682–688, doi:10.3762/bjnano.13.60

• a Si(111) substrate heated to 800 °C. In a second fabrication step, aluminium/aluminium oxide/copper tunnel junctions were fabricated on the EuS film using e-beam lithography and shadow evaporation. The nominal aluminium film thickness was d = 10 nm. The differential conductance g = dI/dV of the

• tunnel junctions was measured as a function of the bias voltage V using standard low-frequency lock-in techniques in a dilution refrigerator at base temperatures down to T = 50 mK with an in-plane magnetic field B applied along the direction of the copper wires, as indicated in Figure 4. Details of film

Comparative molecular dynamics simulations of thermal conductivities of aqueous and hydrocarbon nanofluids

• Adil Loya,
• Antash Najib,
• Fahad Aziz,
• Asif Khan,
• Guogang Ren and
• Kun Luo

Beilstein J. Nanotechnol. 2022, 13, 620–628, doi:10.3762/bjnano.13.54

• investigate thermal properties of different hybrid nanofluids, Singh et al. [35] used theoretical and experimental results of GO–CuO/DW (graphene oxide and copper oxide nanoparticles dispersed in distilled water) and compared those with mononanofluids (i.e., GO/DW and CuO/DW) at different temperatures. The

• white colour represents the oxygen atom and the blue is the hydrogen atom. b) Water/CuO nanofluid in an orthogonal box of 40 Å × 40 Å × 25 Å with 463 water molecules; where red atoms are copper and yellow represents oxygen bonded in a CuO nanoparticle. The blue-coloured atoms are hydrogen and the white

Revealing local structural properties of an atomically thin MoSe₂ surface using optical microscopy

• Lin Pan,
• Peng Miao,
• Anke Horneber,
• Alfred J. Meixner,
• Pierre-Michel Adam and
• Dai Zhang

Beilstein J. Nanotechnol. 2022, 13, 572–581, doi:10.3762/bjnano.13.49

• molybdenum diselenide (MoSe2) flake as surface-enhanced Raman spectroscopy (SERS) platform, we demonstrate the dependency of the Raman enhancement on laser beam polarization and local structure using copper phthalocyanine (CuPc) as probe. Second harmonic generation (SHG) and photoluminescence spectroscopy

• dichalcogenide. Keywords: copper phthalocyanine; local structure; molybdenum diselenide; optical spectroscopy; surface-enhanced Raman spectroscopy; Introduction Two-dimensional (2D) materials have garnered interest for the next generation of optoelectronic and electrochemical devices, mainly owing to their

Influence of thickness and morphology of MoS₂ on the performance of counter electrodes in dye-sensitized solar cells

• Lam Thuy Thi Mai,
• Hai Viet Le,
• Ngan Kim Thi Nguyen,
• Van La Tran Pham,
• Thu Anh Thi Nguyen,
• Nguyen Thanh Le Huynh and
• Hoang Thai Nguyen

Beilstein J. Nanotechnol. 2022, 13, 528–537, doi:10.3762/bjnano.13.44

• , respectively. For comparison, DSSCs based on Pt/FTO CE (DSSCs-Pt) were also fabricated under the same conditions. Characterizations of MoS2 thin films X-ray diffraction (XRD) analysis was carried out using a D8 Advance (Bruker, Germany) with a copper anode (λKα = 1.54 Å). Raman spectroscopy measurements were

A non-enzymatic electrochemical hydrogen peroxide sensor based on copper oxide nanostructures

• Irena Mihailova,
• Vjaceslavs Gerbreders,
• Marina Krasovska,
• Eriks Sledevskis,
• Valdis Mizers,
• Andrejs Bulanovs and
• Andrejs Ogurcovs

Beilstein J. Nanotechnol. 2022, 13, 424–436, doi:10.3762/bjnano.13.35

• , Latvia Institute of Solid State Physics, University of Latvia, Kengaraga street 8, Riga, LV-1063, Latvia 10.3762/bjnano.13.35 Abstract This article describes the synthesis of nanostructured copper oxide on copper wires and its application for the detection of hydrogen peroxide. Copper oxide petal

• qualitative detection of H2O2 in real samples, as well as for the quantitative determination of its concentration. Keywords: copper oxide; electrochemical sensor; hydrogen peroxide; nanostructures; Introduction Hydrogen peroxide, a strong oxidant and an essential intermediate product in many biomedical

• candidate is copper oxide (CuO) [56][67][68][69][70][71]. It has selectivity for the determination of H2O2, high catalytic activity, and a variety of morphologies (e.g., nanoneedles, nanoplates, and nanorods). Various techniques have been used in the preparation of nanostructured epitaxial CuO coatings

A chemiresistive sensor array based on polyaniline nanocomposites and machine learning classification

• Jiri Kroutil,
• Alexandr Laposa,
• Ali Ahmad,
• Jan Voves,
• Vojtech Povolny,
• Ladislav Klimsa,
• Marina Davydova and
• Miroslav Husak

Beilstein J. Nanotechnol. 2022, 13, 411–423, doi:10.3762/bjnano.13.34

• electrode systems was manufactured as a flexible printed circuit board (DuPont Pyralux AP8535 with 75 µm thickness, double-sided, copper-clad laminate in an all-polyimide composite of polyimide film bonded to copper foil). It contains the heating elements and the temperature sensors for the temperature

The effect of metal surface nanomorphology on the output performance of a TENG

• Yiru Wang,
• Xin Zhao,
• Yang Liu and
• Wenjun Zhou

Beilstein J. Nanotechnol. 2022, 13, 298–312, doi:10.3762/bjnano.13.25

• of a metal and a polymer. There are different charge densities on different kinds of metal surface nanomorphology, which significantly influences the output performance of the TENG. Copper samples with different nanomorphology were obtained by controlling pH value, current density, electrolyte

• concentration, and temperature during the electrodeposition of copper. The samples were characterized using XRD and SEM. The output performance of the TENG is closely related to the size, charge density distribution, and shape of the metal nanoparticles. Keywords: charge density; green energy; metal

• freely. Therefore, there is no high charge density on the tip surface of the polymer surface. Here, size and morphology of nanoscale copper were controlled by adjusting current density, temperature, pH value, and solution concentration during electrodeposition. The effects of different morphologies and

Investigation of a memory effect in a Au/(Ti–Cu)Ox-gradient thin film/TiAlV structure

• Damian Wojcieszak,
• Jarosław Domaradzki,
• Michał Mazur,
• Tomasz Kotwica and
• Danuta Kaczmarek

Beilstein J. Nanotechnol. 2022, 13, 265–273, doi:10.3762/bjnano.13.21

• distribution profile of copper are presented. Experimental electrical measurements performed using DC simulation showed wide nonpinched hysteresis loops, indicating bipolar resistive switching properties. Additionally, the so-called forming process of switching properties has been observed for the first cycle

• circular copper target (99.995%). All three targets were sputtered simultaneously in an oxygen atmosphere of 99.999% purity. The targets used in the process were 28.5 mm in diameter and their thickness was 3 mm. The process uses magnetrons with an unbalanced magnetic field set in a confocal configuration

• these pulses (pulse width modulation, PWM). One of the biggest difficulties in the preparation of mixed (Ti,Cu)Ox thin films with defined composition using co-sputtering of Ti and Cu targets is that titanium and copper differ from each other in the sputtering yield in oxygen by a factor of more than ten

Relationship between corrosion and nanoscale friction on a metallic glass

• Haoran Ma and
• Roland Bennewitz

Beilstein J. Nanotechnol. 2022, 13, 236–244, doi:10.3762/bjnano.13.18

• copper surfaces, where it was suggested that more electrons escape in the vicinity of a peak than in a valley [27]. A surface undulation with parallel valleys on our ZrNiTi MG ribbons may be the reason for the distribution of pits along lines. Another possible reason is residual stress, indicated by the

• during deformation [48][49]. No plastic strain occurs in this work, given the much higher yield strength of Zr-based MGs (approx. 1.7 GPa [50]) than that of copper (69–365 MPa [51]). The maximum contact pressure in this work is ca. 0.49 GPa (JKR model), smaller than the yield strength of MGs. As a

Engineered titania nanomaterials in advanced clinical applications

• Padmavati Sahare,
• Paulina Govea Alvarez,
• Juan Manual Sanchez Yanez,
• Gabriel Luna-Bárcenas,
• Samik Chakraborty,
• Sujay Paul and
• Miriam Estevez

Beilstein J. Nanotechnol. 2022, 13, 201–218, doi:10.3762/bjnano.13.15

• TiO2 nps [83]. TiO2 supported on silica nanospheres was checked for its antibacterial activity against E. coli, and the result demonstrated a more effective growth inhibition than that of commercial TiO2-P25 under ultraviolet and visible light [84]. Copper is well known for its antimicrobial properties

• incubation [94]. According to a recent study, nanocomposites could be highly effective in the removal of biofilm and killing of pathogenic bacteria in comparison to pure TiO2 nps without harming healthy human cells. In this context, Baig et al. demonstrated the disinfecting properties of copper oxide

• copper, graphene, silver, silver and nitrogen, sulfur and cadmium sulfide, or transition metals was found to be effective for bringing the excitation wavelength near to the biological window (650 ≤ λ ≤ 950 nm and 1000 ≤ λ ≤ 1350 nm) by providing secondary energy levels close to TiO2 conduction band

Sputtering onto liquids: a critical review

• Anastasiya Sergievskaya,
• Adrien Chauvin and
• Stephanos Konstantinidis

Beilstein J. Nanotechnol. 2022, 13, 10–53, doi:10.3762/bjnano.13.2

• to sputter a 5 cm in diameter copper target. The liquid is placed 10 cm away from the target. The red arrow on the thermograms highlights the presence of a cross-over point when the temperature gradient is reversed during the cooling period (plasma OFF). The heating of the liquid as well as the

• reported in [56] where zinc (Zn) and tin/copper (Sn/Cu) targets are both co-sputtered in a reactive H2S/Ar reactive plasma for the synthesis of Cu2ZnSnS4 (CZTS) coatings. In the case of reactive sputtering, MFCs manage the flow (usually expressed in standard cubic centimeters per minute, sccm). This is a

• where platinum/copper (Pt/Cu) NPs were obtained by using an alloy target for the sputtering onto polyethylene glycol (PEG), it was reported that increasing the current from 10 to 50 mA leads to the formation of bigger NPs, from 1.3 to 4.5 nm, respectively [127

Chemical vapor deposition of germanium-rich CrGe_x nanowires

• Vladislav Dřínek,
• Stanislav Tiagulskyi,
• Roman Yatskiv,
• Jan Grym,
• Radek Fajgar,
• Věra Jandová,
• Martin Koštejn and
• Jaroslav Kupčík

Beilstein J. Nanotechnol. 2021, 12, 1365–1371, doi:10.3762/bjnano.12.100

• even replace them due to their better physicochemical properties. However, while research on plenty of metal silicides is already underway, we are only at the beginning with germanides. For example, CuSix has been studied extensively for some time. There is even an important application of copper

Morphology-driven gas sensing by fabricated fractals: A review

• Vishal Kamathe and
• Rupali Nagar

Beilstein J. Nanotechnol. 2021, 12, 1187–1208, doi:10.3762/bjnano.12.88

• pits. The self-organization of structures was attributed to tin chloride, which led to a larger size of the pits, while copper oxide led to the formation of hillocks in the film. The D values of the samples were in the range of 2.00–2.24. For the Sn/Cu = 6 ratio, the fractal dimension was 2.0, and the

• of ZnO dendrites and single-crystal ZnO dendrites up to the macroscale [77]. These were synthesized via a vapor-phase transport method at 930 °C using a copper catalyst. Figure 16a and Figure 16b show, respectively, a schematic and a SEM image of the ZnO dendrite gas sensor device. The ZnO dendrites

The effect of cobalt on morphology, structure, and ORR activity of electrospun carbon fibre mats in aqueous alkaline environments

• Markus Gehring,
• Tobias Kutsch,
• Osmane Camara,
• Alexandre Merlen,
• Hermann Tempel,
• Hans Kungl and
• Rüdiger-A. Eichel

Beilstein J. Nanotechnol. 2021, 12, 1173–1186, doi:10.3762/bjnano.12.87

• further improved by applying a copper tape connecting the sample and the graphite tape. To identify the particles decorating the nanofibres, EDX was performed using an Octane Super EDX detector (EDAX). The programme “monte CArlo SImulation of electroN trajectory in sOlids” (CASINO) [23], which simulates

• samples were attached to the sample holder using Cu tape. X-ray diffractograms were recorded with a PANalytical Empyrean Series 2 (Malvern PANalytical B.V., Netherlands) in Bragg–Brentano geometry at room temperature using a copper X-ray source (λ(Kα1) = 1.54056 Å, λ(Kα2) = 1.54493 Å). For the measurement

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

• Maximilian Joschko,
• Franck Yvan Fotue Wafo,
• Christina Malsi,
• Danilo Kisić,
• Ivana Validžić and
• Christina Graf

Beilstein J. Nanotechnol. 2021, 12, 1021–1033, doi:10.3762/bjnano.12.76

• ][34][35]. Baum et al. studied the formation of copper thioantimonate by injecting a heated (60 °C) and degassed S-OlAm precursor into a heated (200–250 °C) and degassed mixture of Cu(I)Cl, Sb(III)Cl3, and OlAm. When they omitted sulfur and Cu(I)Cl in this process, they obtained cubic α-Sb2O3

• (senarmontite) [33]. In contrast, they could synthesize the desired copper thioantimonate when they used Sb2O3 instead of Sb(III)Cl3 in a following synthesis. They concluded that Sb2S3 works as an intermediate product rather than as a byproduct. To show that antimony oxide can also be formed under the reaction

• = 1.5–2 g/L) of the particles in IPA was dried on a carbon-coated copper grid (carbon-coating type A, 6–10 nm thickness, Cu 200 mesh, Plano GmbH). The software FIJI was used to evaluate the particle size for 200–300 particles per synthesis on several images [51]. TEM A Zeiss EM 109 was used at 80 kV

Progress and innovation of nanostructured sulfur cathodes and metal-free anodes for room-temperature Na–S batteries

• Marina Tabuyo-Martínez,
• Bernd Wicklein and
• Pilar Aranda

Beilstein J. Nanotechnol. 2021, 12, 995–1020, doi:10.3762/bjnano.12.75

• polysulfides. Thus, the sulfur host has stronger affinity to polysulfides, which get highly immobilized in the cathode. Thus, Zheng et al. [44] reported on a cathode in which the shuttle effect is completely prevented. The sulfur host is based on copper nanoparticles deposited on high surface area mesoporous

• carbon (HSMC). The resulting electrode exhibited a Coulombic efficiency of 100% and a capacity of 610 mAh·g−1 after 110 cycles at 0.03C. This improved cycling stability was attributed to the conductivity enhancement imparted by copper, the sulfur immobilization due to strong copper–polysulfide

• shuttle effect. Zhang et al. [47] studied iron, copper, and nickel nanoclusters (ca 1.2 nm) loaded onto hollow carbon nanospheres. On the one hand, the chemical coupling between nanocluster and sulfur assists in sulfur immobilization and enhances conductivity and reactivity. On the other hand, the

A Au/CuNiCoS₄/p-Si photodiode: electrical and morphological characterization

• Adem Koçyiğit,
• Adem Sarılmaz,
• Teoman Öztürk,
• Faruk Ozel and
• Murat Yıldırım

Beilstein J. Nanotechnol. 2021, 12, 984–994, doi:10.3762/bjnano.12.74

• nanocrystals. Also, I–V and C–V measurements were performed to determine the photodiode and capacitance characteristics of the Au/CuNiCoS4/p-Si devices. Experimental Materials Copper(II) acetate (CuAc2), nickel(II) acetate (NiAc2), cobalt acetate (CoAc2), trioctylphosphine oxide (TOPO), 1-dodecanethiol (DDT

Is the Ne operation of the helium ion microscope suitable for electron backscatter diffraction sample preparation?

• Annalena Wolff

Beilstein J. Nanotechnol. 2021, 12, 965–983, doi:10.3762/bjnano.12.73

• microscope is better suited to achieve the required mirror-flat sample surface when operating the ion source with Ne instead of He. Copper was chosen as a test material and polished using Ga and Ne ions with different ion energies as well as incident angles. The results show that crystal structure

• here looks at the ion-beam-induced artefacts when polishing copper for EBSD measurements for different ion species (Ga, Ne) as well as polishing protocols. EBSD is a characterization technique in scanning electron microscopes (SEMs) that allows for the study of microstructure, local texture, grain size

• as ion impurity concentration within the smaller of either the EBSD information depth (20 nm) or interaction volume depth are evaluated and correlated to the experiments. Non-irradiated copper To verify the original specimen structure, TEM electron diffraction on thin foils as well as EBSD

Uniform arrays of gold nanoelectrodes with tuneable recess depth

• Elena O. Gordeeva,
• Ilya V. Roslyakov,
• Alexey P. Leontiev,
• Alexey A. Klimenko and
• Kirill S. Napolskii

Beilstein J. Nanotechnol. 2021, 12, 957–964, doi:10.3762/bjnano.12.72

• segment were selectively etched away after turning the AAO template upside down (Figure 1d). Segment 1 – copper Optimization of the deposition potential (Ed) for the formation of the first Cu segment was performed in the range from −0.1 to −0.5 V. In the case of more negative potentials, an intensive

• surface. Segment 3 – copper At this step, a key quality parameter is the percentage of pores filled by the metals completely from the bottom to the top of the AAO template. Only nanowires in this type of pores can take part in an electrochemical reaction during the operation of the NEAs because only these

The role of deep eutectic solvents and carrageenan in synthesizing biocompatible anisotropic metal nanoparticles

• Nabojit Das,
• Akash Kumar and
• Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2021, 12, 924–938, doi:10.3762/bjnano.12.69

• successful use in biological milieus. Recent studies indicated that the green synthesis of nanoparticles, such as zinc oxide nanoparticles and bimetallic copper–silver and nickel–cobalt nanoparticles, is preferred for catalytic, antibacterial, and therapeutic applications [12][13][14]. Several other