Potential of a deep eutectic solvent in silver nanoparticle fabrication for antibiotic residue detection

• Le Hong Tho,
• Bui Xuan Khuyen,
• Ngoc Xuan Dat Mai and
• Nhu Hoa Thi Tran

Beilstein J. Nanotechnol. 2024, 15, 426–434, doi:10.3762/bjnano.15.38

• the nanostructure and surface morphology of the nanoparticles, as well as the elemental distribution of silver on the substrate, a S4800 field-emission scanning electron microscope purchased from Hitachi, Japan, and an M4 TORNADOPlus Micro X-ray fluorescence spectrometer with a Rh tube at 30 W micro

Classification and application of metal-based nanoantioxidants in medicine and healthcare

• Nguyen Nhat Nam,
• Nguyen Khoi Song Tran,
• Tan Tai Nguyen,
• Nguyen Ngoc Trai,
• Nguyen Phuong Thuy,
• Hoang Dang Khoa Do,
• Nhu Hoa Thi Tran and
• Kieu The Loan Trinh

Beilstein J. Nanotechnol. 2024, 15, 396–415, doi:10.3762/bjnano.15.36

• capability to degrade reactive nitrogen species (RNS) are rare. In response, Miao et al. synthesized polyethylene glycol-coated ultrasmall rhodium nanodots (Rh-PEG NDs) for scavenging both ROS and RNS in order to decrease inflammation [106]. Rh-PEG NDs exhibited O2•–, HO•, NO•, ONOO–, and H2O2 scavenging

A wearable nanoscale heart sound sensor based on P(VDF-TrFE)/ZnO/GR and its application in cardiac disease detection

• Yi Luo,
• Jian Liu,
• Jiachang Zhang,
• Yu Xiao,
• Ying Wu and
• Zhidong Zhao

Beilstein J. Nanotechnol. 2023, 14, 819–833, doi:10.3762/bjnano.14.67

• electrospinning were controlled at 25 °C and 40% RH, respectively. Fabrication of wearable flexible nanoscale heart sound sensors Figure 2 illustrates the process of creating a wearable, flexible nanoscale heart sound sensor with a sandwich structure. First, a rectangular composite nanofilm measuring 4.5 cm in

Humidity-dependent electrical performance of CuO nanowire networks studied by electrochemical impedance spectroscopy

• Jelena Kosmaca,
• Juris Katkevics,
• Jana Andzane,
• Raitis Sondors,
• Liga Jasulaneca,
• Raimonds Meija,
• Kiryl Niherysh,
• Yelyzaveta Rublova and
• Donats Erts

Beilstein J. Nanotechnol. 2023, 14, 683–691, doi:10.3762/bjnano.14.54

• , Riga, Latvia 10.3762/bjnano.14.54 Abstract Electrochemical impedance spectroscopy was applied for studying copper oxide (CuO) nanowire networks assembled between metallic microelectrodes by dielectrophoresis. The influence of relative humidity (RH) on electrical characteristics of the CuO nanowire

• -based system was assessed by measurements of the impedance Z. A slight increase of Z with increasing RH at low humidity was followed by a three orders of magnitude decrease of Z at RH above 50–60%. The two opposite trends observed across the range of the examined RH of 5–97% can be caused by water

• nanowires in combination with good electrical conductivity and thermoelectric power reaching 500 µV/K enables their application as p-type components for environmentally friendly thermoelectric devices [3][4]. Investigating the influence of relative humidity (RH) and understanding conductivity mechanisms in

A novel approach to pulsed laser deposition of platinum catalyst on carbon particles for use in polymer electrolyte membrane fuel cells

• Bogusław Budner,
• Wojciech Tokarz,
• Sławomir Dyjak,
• Andrzej Czerwiński,
• Bartosz Bartosewicz and
• Bartłomiej Jankiewicz

Beilstein J. Nanotechnol. 2023, 14, 190–204, doi:10.3762/bjnano.14.19

• , enough water to moisten the membrane. A self-propelling mechanism is created, but there are a low current, insufficient water in the diaphragm, a high internal diaphragm resistance, and a power drop. The attempt to support the cell by increasing the cathode hydration (to about 125% RH) did not improve

Liquid phase exfoliation of talc: effect of the medium on flake size and shape

• Samuel M. Sousa,
• Helane L. O. Morais,
• Joyce C. C. Santos,
• Ana Paula M. Barboza,
• Bernardo R. A. Neves,
• Elisângela S. Pinto and
• Mariana C. Prado

Beilstein J. Nanotechnol. 2023, 14, 68–78, doi:10.3762/bjnano.14.8

• the authors who also use some of the methodology proposed by Chacham and colleagues [28], using AFM data we calculate three dimensionless aspect ratios: Next, we plotted the probability distributions of the logarithm of these aspect ratios, ln(rh), ln(rFeret), and ln(rMinF). Figure 3b–d shows the

• these components (Figure 3f) [26]. The arrows in Figure 3f emphasize the meaning of the ratios. The rh/rFeret axis correlates with the voluminosity of a flake, that is, a greater the value indicates a more three-dimensional shape of the sample. A greater value of the rFeret/rMinF axis indicates a more

• ribbon-shaped flake, that is, a more one-dimensional shape. Finally, greater values of the rMinF/rh axis indicate a more plate-shaped flake, that is, a more two-dimensional shape. The four media investigated here clearly produce samples with different shape characteristics. SC6 flakes are the most two

Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition

• Mykhailo Nahorniak,
• Pamela Pasetto,
• Jean-Marc Greneche,
• Volodymyr Samaryk,
• Sandy Auguste,
• Anthony Rousseau,
• Nataliya Nosova and
• Serhii Varvarenko

Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2

• investigated using a conventional transmission device with a Co source diffused into a Rh matrix. The hyperfine parameters were refined by using quadrupolar doublets and magnetic sextets with Lorentzian lines. The values of the isomer shift are quoted to that of α-Fe at room temperature (RT). Indeed, this

• technique is highly sensitive to the valence state of Fe species and thus enables the identification of magnetite and maghemite and the estimation of their respective proportions. Measurements were performed in a transmission geometry with a 925 MBq γ-source of 57Co/Rh mounted using a conventional constant

Studies of probe tip materials by atomic force microscopy: a review

• Ke Xu and
• Yuzhe Liu

Beilstein J. Nanotechnol. 2022, 13, 1256–1267, doi:10.3762/bjnano.13.104

• ][24]. Jiménez-Sánchez et al. [25] studied the extraction of Ir clusters from graphene (by indentation) on the surface of Rh(111) to fabricate AFM sharp nano-tips, i.e., with weak van der Waals interactions. Experiments were performed under ultrahigh pressure and low temperature (5 K) conditions using

• bias-assisted electroreduced gold ions in mesoporous silica films on a conductive substrate. It works in the air with high relative humidity (RH) at room temperature and leads to the growth of fine wires attached to the tip with tens to hundreds of nanometers. Under room temperature conditions with

• high RH, the gold ions loaded in the specific substrate of the mesoporous silica layer are biased, and the gold ions therein migrate upward and accumulate at the tip site of the probe, forming gold nanowires. The length of the gold nanowires can be effectively tuned in the range of 10–100 nm with a

Application of nanoarchitectonics in moist-electric generation

• Jia-Cheng Feng and
• Hong Xia

Beilstein J. Nanotechnol. 2022, 13, 1185–1200, doi:10.3762/bjnano.13.99

• with permission from [81], Copyright 2020 American Chemical Society. This content is not subject to CC BY 4.0. (c) VOC variation upon exposure to air flow at different RH values, flow velocity: 15 cm·s−1. (d) VOC variation upon exposure to air flow with different velocities, RH: 99%. (e, f) Water

• . This content is not subject to CC BY 4.0. (a) RH at both sides of the membrane. H = 6 cm. (b) RH1 and RH2 as functions of H. ΔWC is the transmembrane water content difference. (c) VOC and Vid as functions of H. (d) Air flow (2.5 m·s−1)-enhanced power generation. (e) SEM image of the prepared ion

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

• multiplexor for switching four sensor elements, and a Labview-based data acquisition system. The sensing layers were tested towards carbon dioxide (250 ppm CO2), carbon monoxide (25 ppm), ammonia (25 ppm), nitrogen dioxide (25 ppm), acetone (6%), toluene (500 ppm) and humid air (RH) in synthetic air (SA) at

• arrays were exposed to various relative humidity levels ranging from 20% to 80% (Figure 10). The obtained results show a decreasing sensor response with increasing RH% value. This change in response toward relative humidity is due to the adsorption of water molecules and an increase of charge

• CO2, (e) 6000 ppm of acetone, and (f) 500 ppm of toluene at room temperature. The responses of sensing layers for different concentrations of NH3. Gas characterization of active layers to different concentrations of NH3 at 80 °C. The summary of the gas sensor responses for all active layers. RH

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

• used. All electrical measurements were made at controlled room temperature (23 °C) and humidity (30% RH) in ambient air. Results Electrical properties The resistivity of the thin film was determined to be 1 × 103 Ω·cm. The type of electrical conductivity was determined on the basis of the sign of the

Design aspects of Bi₂Sr₂CaCu₂O_8+δ THz sources: optimization of thermal and radiative properties

• Mikhail M. Krasnov,
• Natalia D. Novikova,
• Roger Cattaneo,
• Alexey A. Kalenyuk and
• Vladimir M. Krasnov

Beilstein J. Nanotechnol. 2021, 12, 1392–1403, doi:10.3762/bjnano.12.103

• the substrate. This occurs because the heat resistance, Rh = d/(κA), is inversely proportional to the area A. Due to a much larger crystal area, Rh of epoxy is negligible despite a low κ and larger de = 5 μm. Adding an electrode and He exchange gas further reduces self-heating, but their effect is not

• produced and by estimation of heat resistances of different elements. For example, from Figure 3e it is seen that for a bare mesa on a whisker the heat is flowing along the whisker. This occurs because the epoxy layer with a large Rh = 44.4 K/mW blocks direct (vertical) heat flow into the substrate

• . However, the maximal self-heating, ΔT = 75.2 K, is almost two times larger, implying that there is yet another bottleneck. It is caused by a small bc (yz) cross sectional area of the whisker. This additional in-plane heat resistance, Rh ≈ 30 K/mW, corresponds to the effective length of heat spreading

Polarity in cuticular ridge development and insect attachment on leaf surfaces of Schismatoglottis calyptrata (Araceae)

• Venkata A. Surapaneni,
• Tobias Aust,
• Thomas Speck and
• Marc Thielen

Beilstein J. Nanotechnol. 2021, 12, 1326–1338, doi:10.3762/bjnano.12.98

• 23.8 ± 0.4 °C and humidity of 41.5 ± 2.1% RH. Statistics The roughness, traction force and cell size data were analyzed using Kruskal–Wallis test followed by pairwise multiple comparisons using Dunn’s test adjusted with the Bonferroni correction. All statistical tests were performed using R software

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

• ppm TEA at 35% RH. Cadmium sulfide-based fractals Highly oriented CdS dendrite (HOCSD) sensors synthesized by a hydrothermal method to detect formic acid (HCOOH) and hydrazine (N2H4) were reported by Guo and co-workers [83]. The multichannel branches of dendritic structure of the CdS sensor allowed

Local stiffness and work function variations of hexagonal boron nitride on Cu(111)

• Abhishek Grewal,
• Yuqi Wang,
• Matthias Münks,
• Klaus Kern and
• Markus Ternes

Beilstein J. Nanotechnol. 2021, 12, 559–565, doi:10.3762/bjnano.12.46

• 9.4 ± 0.9 N·m−1, which is one order of magnitude higher than the one obtained for h-BN/Rh(111). Using constant force maps we are able to derive height profiles of h-BN/Cu(111) showing that the system has a corrugation of 0.6 ± 0.2 Å, which helps to demystify the discussion around the flatness of the h

• ) [19][20], strain-induced highly corrugated layers for h-BN/Rh(111) [21][22][23], and template layers for molecules with strong local variations of the work function for h-BN/Ir(111) [24] are representative of such morphological diversity. We use low-temperature combined scanning tunnelling (STM) and

• variations. We determine the stiffness of the system by mapping and comparing the short-range interaction forces between the monolayer and the probing metallic tip [31]. This technique enables us to detect the sheet stiffness with unprecedented spatial resolution [23]. On h-BN/Rh(111), a different system

Paper-based triboelectric nanogenerators and their applications: a review

• Jing Han,
• Nuo Xu,
• Yuchen Liang,
• Mei Ding,
• Junyi Zhai,
• Qijun Sun and
• Zhong Lin Wang

Beilstein J. Nanotechnol. 2021, 12, 151–171, doi:10.3762/bjnano.12.12

• stable thin layer, which could be used as a free-standing friction layer (also electrode) in TENGs. In addition to the applications in energy harvesting, GO can also be readily used to monitor the relative humidity (RH) because of the strong interactions between water molecules and oxygen functional

• layer. In a low RH scenario, water molecules are primarily condensed onto the available active sites of the GO surface, which act as the obstacle for electrostatically induced charges and reduce the contact surface to form a depletion region. As a consequence, the output current of the GO P-TENGs

• decreases in a low RH condition. As the RH increases, the hydroxy groups of the first physisorbed layer bond to water molecules, through hydrogen bonding, which also permeate into the interlayers of GO. The gradually absorbed water layer creates a uniform barrier layer for the induction of positive charges

Fusion of purple membranes triggered by immobilization on carbon nanomembranes

• René Riedel,
• Natalie Frese,
• Fang Yang,
• Martin Wortmann,
• Raphael Dalpke,
• Daniel Rhinow,
• Norbert Hampp and
• Armin Gölzhäuser

Beilstein J. Nanotechnol. 2021, 12, 93–101, doi:10.3762/bjnano.12.8

• fluorescence micrographs. Funding This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Cluster of Excellence “Macromolecular Complexes” Frankfurt, DFG grant GO 918/14-1 to AG, DFG grant HA 2906/9-1 to NH, and DFG grant RH 134/1-1 to DR.

Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes

• Saja Al-Khabouri,
• Salim Al-Harthi,
• Toru Maekawa,
• Mohamed E. Elzain,
• Ashraf Al-Hinai,
• Ahmed D. Al-Rawas,
• Abbsher M. Gismelseed,
• Ali A. Yousif and
• Myo Tay Zar Myint

Beilstein J. Nanotechnol. 2020, 11, 1891–1904, doi:10.3762/bjnano.11.170

• at 77 K, using a Mössbauer spectrometer in constant-acceleration mode with 50 mC 57Co in a Rh source. Results and Discussion Free MnFe2O4 nanoparticles The XRD patterns were analyzed using the MAUD (material analysis using diffraction) fitting software based on the Rietveld method and on Fourier

The influence of an interfacial hBN layer on the fluorescence of an organic molecule

• Christine Brülke,
• Oliver Bauer and
• Moritz M. Sokolowski

Beilstein J. Nanotechnol. 2020, 11, 1663–1684, doi:10.3762/bjnano.11.149

• bandgap of hBN, as indicated in Figure 1b. This is in agreement with the findings by Martínez-Galera et al. for PTCDA/hBN/Rh(110) [34]. From scanning tunneling spectroscopy (STS) experiments, the authors concluded that the coupling is only weak. They deduced further that the CT (in the ground state

• al. [23] investigated the optical absorption properties of PTCDA on hBN/Rh(111) and hBN/Pt(111). Here, we report a direct comparison of FL spectra of PTCDA/hBN/Cu(111) and PTCDA/Cu(111), which allows for a relative determination of the efficiency of the hBN layer to decouple the excited states of

• threshold temperature (ca. 280 K). This explains why FLB can only be observed after annealing or deposition at or above this temperature. The energetic difference between FLA and FLB amounts to ca. 150 cm−1. We compare this to the energetic shift reported by Forker et al. who investigated PTCDA on hBN/Rh

Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)

• Domenik M. Zimmermann,
• Knud Seufert,
• Luka Ðorđević,
• Tobias Hoh,
• Sushobhan Joshi,
• Tomas Marangoni,
• Davide Bonifazi and
• Willi Auwärter

Beilstein J. Nanotechnol. 2020, 11, 1470–1483, doi:10.3762/bjnano.11.130

• coverages of PTCDA and MnPc on the strongly corrugated hBN/Rh(111) support [21][22][80], with computational modeling showing PTCDA rings positioned above the N sites of a hBN flake [14]. In contrast, no preferred orientations have been identified for a hydrocarbon lander molecule (i.e., DBP) on hBN/Pt(111

Triboelectric nanogenerator based on Teflon/vitamin B1 powder for self-powered humidity sensing

• Liangyi Zhang,
• Huan Li,
• Yiyuan Xie,
• Jing Guo and
• Zhiyuan Zhu

Beilstein J. Nanotechnol. 2020, 11, 1394–1401, doi:10.3762/bjnano.11.123

• -emitting diodes (LEDs) are integrated with the humidity sensor and the luminosity is an indicator of the relative humidity (RH) from the surrounding environment. Experimental The conductive copper foil tape is used as the electrode, while the paper (manufacturer: Miao Ben) at the bottom serves as a

• -TENG were performed in Chongqing, located in the southern region of China where it rains often and the annual relative humidity is usually above 40%. Thus, the humidity sensor response is limited due to a change in RH from 40 to 90% (Figure 4a–f). The dynamic change between the output voltage and the

• RH can be derived from the 2D graph. As the RH increased, there was a declining trend in the output signal. Figure 4 shows the output voltage of the TVB-TENG upon a change in RH. The output voltages of 371 V, 331 V, 247 V, 180 V, 137 V and 105 V corresponded to RH levels of 40%, 50%, 60%, 70%, 80

Scanning tunneling microscopy and spectroscopy of rubrene on clean and graphene-covered metal surfaces

• Karl Rothe,
• Alexander Mehler,
• Nicolas Néel and
• Jörg Kröger

Beilstein J. Nanotechnol. 2020, 11, 1157–1167, doi:10.3762/bjnano.11.100

• phthalocyanine molecules on graphene-covered SiO2/Si samples [5] as well as on h-BN-covered Ir(111) [6], of conjugated oligohenylenes on h-BN-covered Cu(111) [7], of manganese phthalocyanine on h-BN-covered Rh(111) [8], and of 5,10,15,20-tetraphenylbisbenz[5,6]indendo[1,2,3-cd:1′,2′,3′-lm]perylene on graphene

Excitonic and electronic transitions in Me–Sb₂Se₃ structures

• Nicolae N. Syrbu,
• Victor V. Zalamai,
• Ivan G. Stamov and
• Stepan I. Beril

Beilstein J. Nanotechnol. 2020, 11, 1045–1053, doi:10.3762/bjnano.11.89

• following parameters: εb = 7.5, ωТ = 1.219 eV, ωLT = 14 meV, γ = 161, and M = 4.5m0. By using the obtained experimental data and the known relation where RH is the Rydberg energy of a hydrogen atom (13.6 eV) and Ry is the binding energy for the corresponding exciton (Rydberg constant), the reduced

Key for crossing the BBB with nanoparticles: the rational design

• Sonia M. Lombardo,
• Marc Schneider,
• Akif E. Türeli and
• Nazende Günday Türeli

Beilstein J. Nanotechnol. 2020, 11, 866–883, doi:10.3762/bjnano.11.72

• 20, 40, 60 and 80, poloxamer 184, 188, 388, 407 and 908, Brij® 35 and Cremophors® EZ and RH. Only PBCA nanoparticles coated with polysorbates showed a significant analgesic effect, and the highest effect was obtained for PS80-coated nanoparticles. Further studies showed that PS80 did not cause any

Recent progress in perovskite solar cells: the perovskite layer

• Xianfeng Dai,
• Ke Xu and
• Fanan Wei

Beilstein J. Nanotechnol. 2020, 11, 51–60, doi:10.3762/bjnano.11.5

• only 2.2% after 1,512 hours without encapsulation when exposed to ambient conditions with 55% relative humidity (RH). Very recently, Stoumpos et al. [60] reported a novel 2D perovskite that adopted the Dion–Jacobson (DJ) structure, which is considered to be more stable and more efficient than its RP

• light illumination for 3,000 hours and damp heat (heating at 85 °C and 85% RH) for 168 hours. These results demonstrate that PSCs based on DJ phase perovskites have higher efficiency and stability than those based on the RP structure, without the need for additives or pretreatment. 2D/3D PSCs Although

• hydrophobicity, which could improve the performance and the stability of the devices. Indeed, the resulting 2D/3D PSCs showed superior stability. Namely, the PCE of the devices decreased by only 8% of the initial value upon exposure to ambient conditions with 50 ± 5% RH for 2400 h. The maximum PCE of the devices