Beyond the bilayer: multilayered hygroscopic actuation in pine cone scales

• Kim Ulrich,
• Max David Mylo,
• Tom Masselter,
• Fabian Scheckenbach,
• Sophia Fischerbauer,
• Martin Nopens,
• Silja Flenner,
• Imke Greving,
• Linnea Hesse and
• Thomas Speck

Beilstein J. Nanotechnol. 2025, 16, 1695–1710, doi:10.3762/bjnano.16.119

• ]. Although recent advances in the study of pine cone scales have revealed the involvement of more than two tissue layers (sclereid cells, brown tissue, and sclerenchyma fibers) that may themselves contain a gradient [18][19][23][24], the relationship between these gradients and the resulting axis-dependent

Ambient pressure XPS at MAX IV

• Mattia Scardamaglia,
• Ulrike Küst,
• Alexander Klyushin,
• Rosemary Jones,
• Jan Knudsen,
• Robert Temperton,
• Andrey Shavorskiy and
• Esko Kokkonen

Beilstein J. Nanotechnol. 2025, 16, 1677–1694, doi:10.3762/bjnano.16.118

• environment, atomic layer deposition (ALD) is another field particularly developed at MAX IV. Also, the ultrahigh brightness of MAX IV ring, joined with in-house developments, make feasible in the soft X-ray regime, experiments accessing liquid layers and their interfaces with solids, opening up to completely

• and allows the CO to intercalate and then oxidize. Rather than studying the reaction below 2D materials, Scardamaglia et al. investigated graphene and hBN as protective layers for copper metal surfaces in a reactive environment [31]. In operando experiments with a linear temperature ramp in 2 mbar O2

• , bare copper rapidly oxidized to Cu2O at room temperature and further to CuO at ~200 °C. However, with hBN or graphene layers, oxidation was significantly delayed. Both 2D materials retard the oxidation of Cu by more than 120 °C, but with different kinetics. The behavior of hBN/Cu is relatively simple

Nanotechnology-based approaches for the removal of microplastics from wastewater: a comprehensive review

• Nayanathara O Sanjeev,
• Manjunath Singanodi Vallabha and
• Rebekah Rubidha Lisha Rabi

Beilstein J. Nanotechnol. 2025, 16, 1607–1632, doi:10.3762/bjnano.16.114

• , and Tx represents surface functional groups like oxygen, fluorine, hydroxy, or hydrogen. MXenes are synthesized by selective removal of A-layers with elements from group IIIA or IVA, such as aluminium or silicon, from a parent material. This process results in a nanomaterial with an expansive surface

Bioinspired polypropylene-based functionally graded materials and metamaterials modeling the mistletoe–host interface

• Lina M. Rojas González,
• Naeim Ghavidelnia,
• Christoph Eberl and
• Max D. Mylo

Beilstein J. Nanotechnol. 2025, 16, 1592–1606, doi:10.3762/bjnano.16.113

• between layers of different materials [22]. Thus, almost all functionally graded metamaterials are limited to structural gradients and do not feature material gradients. Nature is one prime example of multihierarchical structuring and gradation, which can be found in various forms and on different scales

• failure over large parts of the specimen. For the graded and inversely graded metamaterials, a significant strain concentration in a similar range was observed in the area of the 1–2 thinnest layers of the beams (graded metamaterial) and the 2–3 thinnest layers of the beams (inversely graded metamaterial

Modeling magnetic properties of cobalt nanofilms used as a component of spin hybrid superconductor–ferromagnetic structures

• Aleksey Fedotov,
• Olesya Severyukhina,
• Anastasia Salomatina and
• Anatolie Sidorenko

Beilstein J. Nanotechnol. 2025, 16, 1557–1566, doi:10.3762/bjnano.16.110

• parameters of the modeled nanoscale systems. It was found that the magnetic energy and magnetization norm of the system change in a nonlinear manner with increasing number of crystalline layers of the nanofilm. The peaks found on the graph of the magnetization rate change can be caused by surface effects in

• energy are in the range of −4.56 to −4.53 eV. Such behavior of the magnetic energy can be related to the fact that with increasing thickness of the nanofilm, the fraction of its surface atoms decreases and the influence of various surface effects decreases. As the number of crystalline layers of the

• components with peaks is observed at nanofilm thicknesses of 6, 10, and 12 crystal cells. The intensity of the peaks decreases with increasing thickness of the cobalt layers, which is clearly visible in Figure 6. The value of each next mode decreased in absolute value by more than 50% compared to the

Transient electronics for sustainability: Emerging technologies and future directions

• Jae-Young Bae,
• Myung-Kyun Choi and
• Seung-Kyun Kang

Beilstein J. Nanotechnol. 2025, 16, 1545–1556, doi:10.3762/bjnano.16.109

• masking for use as channel layers or gate oxide layers in transistors [14][48][63]. Also printable electronics have been realized by blending bioresorbable fillers into polymers such as Zn (or W)-poly(ethylene oxide), Zn-polyvinylpyrrolidone, Mo-polybutanedithiol-1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H

• electronic devices on a large-area substrate, such as a silicon wafer, followed by backside etching to remove the handle or box layers, thereby isolating the functional thin film for transfer onto a biodegradable substrate. This wafer-level technique offers a promising route to large-area, high-resolution

• semiconductor processes, the substitution of conventional dielectric and metal layers with biodegradable counterparts suggests the feasibility of wafer-scale foundry integration (Figure 2d) [80]. For example, the foundry-scale fabrication of transient complementary metal-oxide-semiconductor devices (inverter

Cross-reactivities in conjugation reactions involving iron oxide nanoparticles

• Shoronia N. Cross,
• Katalin V. Korpany,
• Hanine Zakaria and
• Amy Szuchmacher Blum

Beilstein J. Nanotechnol. 2025, 16, 1504–1521, doi:10.3762/bjnano.16.106

• (IONPs) with functional organic molecules is a major area of research for biomedical applications. Conjugation reactions, such as carbodiimide coupling and the highly selective class of reactions known as “click chemistry”, have been instrumental in tailoring the ligand layers of IONPs to produce

Laser processing in liquids: insights into nanocolloid generation and thin film integration for energy, photonic, and sensing applications

• Akshana Parameswaran Sreekala,
• Pooja Raveendran Nair,
• Jithin Kundalam Kadavath,
• Bindu Krishnan,
• David Avellaneda Avellaneda,
• M. R. Anantharaman and
• Sadasivan Shaji

Beilstein J. Nanotechnol. 2025, 16, 1428–1498, doi:10.3762/bjnano.16.104

• liquid to spread naturally and form elliptical or circular layers with diameters of 15–20 mm. The estimated liquid layer thickness was 1.6–2.8 mm. After the drop-casting process, about 5.4 mg of Ag NPs were deposited, resulting in a dried layer thickness of approximately 1.6–2.9 µm [120]. The

• deposition process [123]. However, this method has not yet been established for laser-processed colloids, making it an area open for further exploration. 2.3 Doctor blade technique The doctor blade technique is a method used to prepare layers with a precise and controlled thickness. One of its key advantages

Photochemical synthesis of silver nanoprisms via green LED irradiation and evaluation of SERS activity

• Tuan Anh Mai-Ngoc,
• Nhi Kieu Vo,
• Cong Danh Nguyen,
• Thi Kim Xuan Nguyen and
• Thanh Sinh Do

Beilstein J. Nanotechnol. 2025, 16, 1417–1427, doi:10.3762/bjnano.16.103

• play decisive roles, namely, the source of silver ions (Ag+) and the reducing agent that converts Ag+ to metallic silver (Ag0). Upon LED irradiation of the system containing initial AgNPs seeds, the atomic layers of silver at the nanoparticle surfaces are excited and oxidized by dissolved oxygen in the

Synthesis and antibacterial properties of nanosilver-modified cellulose triacetate membranes for seawater desalination

• Lei Wang,
• Shizhe Li,
• Kexin Xu,
• Wenjun Li,
• Ying Li and
• Gang Liu

Beilstein J. Nanotechnol. 2025, 16, 1380–1391, doi:10.3762/bjnano.16.100

• and Ag) are present in extremely low quantities relative to the CTA matrix. (For specific details on the content of the modifying layers, please refer to Supporting Information File 1.) The sensitivity of FTIR spectroscopy depends on the concentration of the absorbed species and the path length of the

• Information File 1, Figure S4. The EDS maps confirm the presence of N and Ag within the layers of PCTA and Ag@PCTA, respectively, and provide additional evidence for the structural and compositional analysis. The EDS mapping confirms that both PDA and Ag have been successfully deposited onto the surface of

Automated collection and categorisation of STM images and STS spectra with and without machine learning

• Dylan Stewart Barker and
• Adam Sweetman

Beilstein J. Nanotechnol. 2025, 16, 1367–1379, doi:10.3762/bjnano.16.99

• the labelling completed, it was possible to train a series of 1D convolutional neural networks (CNNs). In total, 72 models were trained, varying the number of convolutional layers between 1 and 3, the number of dense training layers between 1 and 3, the number of kernels in the first convolutional

• layer (32 and 64 kernels were used, doubling in successive layers), kernels of sizes 3 × 3 or 5 × 5, and dropout layers with rates of either 0.3 or 0.5, including all combinations of these. The training was carried out on the training dataset containing 1823 spectra, validating the model after each

• ”. This metric therefore places more weight on false negatives than the precision metric and is also not as largely skewed by imbalanced datasets as the accuracy metric. The model which achieved the best balance between the three metrics was one which contained two convolutional layers starting with 5 × 5

Hydrogels and nanogels: effectiveness in dermal applications

• Jéssica da Cruz Ludwig,
• Diana Fortkamp Grigoletto,
• Daniele Fernanda Renzi,
• Wolf-Rainer Abraham,
• Daniel de Paula and
• Najeh Maissar Khalil

Beilstein J. Nanotechnol. 2025, 16, 1216–1233, doi:10.3762/bjnano.16.90

• multiple layers of poly(N-vinyl caprolactam) were developed to carry sodium diclofenac to the skin. Regarding thermo-responsiveness, the cumulative amount of diclofenac transported at 32 °C after 24 h was 12 times higher than at 22 °C [197]. In another effort, thermo-responsive nanogels based on gellan gum

• application of hydrogels and nanogels (Table 2), which aim to optimize site-specific drug targeting in the tumor cells [192][195][209]. Skin cancer arises through the abnormal and uncontrolled growth of cells forming skin tissue. The skin cells are arranged in layers and, according to the affected layers

• the tumor with leakage permeable to blood flow due to disordered endothelial cell layers. This cellular organization of the vasculature with increased permeability allows increased uptake of nanoparticles by endocytosis and, consequently, increased cytotoxic effect of antineoplastic drugs. Thus, with

Transfer function of an asymmetric superconducting Gauss neuron

• Fedor A. Razorenov,
• Aleksander S. Ionin,
• Nikita S. Shuravin,
• Liubov N. Karelina,
• Mikhail S. Sidel’nikov,
• Sergey V. Egorov and
• Vitaly V. Bol’ginov

Beilstein J. Nanotechnol. 2025, 16, 1160–1170, doi:10.3762/bjnano.16.85

• sample. LA,B denote receiving arms, Lout is the output arm, JJA,B are the JJs of the neuron, JJI,II are the JJs of the measuring element (i.e.,SQUID), and Lsq is the loop of the measuring element. Different colors represent elements in different layers of the multilayer structure. Hatching indicates the

Crystalline and amorphous structure selectivity of ignoble high-entropy alloy nanoparticles during laser ablation in organic liquids is set by pulse duration

• Robert Stuckert,
• Felix Pohl,
• Oleg Prymak,
• Ulrich Schürmann,
• Christoph Rehbock,
• Lorenz Kienle and
• Stephan Barcikowski

Beilstein J. Nanotechnol. 2025, 16, 1141–1159, doi:10.3762/bjnano.16.84

• produces polycrystalline HEA NPs, nanosecond-pulsed laser ablation favors a metastable amorphous structure. Particle cores in all cases exhibit a homogeneous distribution of the metals Cr, Mn, Fe, Co, and Ni, while particle shells were found to vary between manganese-enriched oxide layers and thin

• the particle, its horizontal progression of oxygen signal hints towards surface oxidation. This follows the XRD results (Figure 2A and Figure 2B) where reflections attributed to MnO were identified, most likely resulting from thin oxide layers on top of metallic HEA NPs as can be seen in Supporting

Influence of ion beam current on the structural, optical, and mechanical properties of TiO₂ coatings: ion beam-assisted vs conventional electron beam evaporation

• Agata Obstarczyk and
• Urszula Wawrzaszek

Beilstein J. Nanotechnol. 2025, 16, 1097–1112, doi:10.3762/bjnano.16.81

• with Iibg = 4 A revealed the formation of a bilayer, indicating the separation of grains into two distinct rows or layers. The width of the elongated grains in this case ranged from 90 to 115 nm. Yang et al. [6] mentioned that compared to conventional electron beam evaporation, ion bombardment provides

• an additional Iibg of 4 A, can be understood as the separation of grains into two distinct rows or layers. This phenomenon may be related to the deposition conditions and the post-process heat treatment of the titanium dioxide thin film. As the grains grow during annealing, the top row of grains may

• recrystallize differently from those near the substrate, forming a visible boundary. The separation between the two layers of grains may be related to the difference in the grain growth kinetics, which may be influenced by the annealing conditions. For optical coatings, amorphous, very smooth TiO2 layers with

Single-layer graphene oxide film grown on α-Al₂O₃(0001) for use as an adsorbent

• Shiro Entani,
• Mitsunori Honda,
• Masaru Takizawa and
• Makoto Kohda

Beilstein J. Nanotechnol. 2025, 16, 1082–1087, doi:10.3762/bjnano.16.79

• drop-casting technique, wherein GO flakes dispersed in a solvent are cast onto a substrate [16][17]. This technique does not allow for the control of number of layers. Consequently, studies have been conducted to synthesize large-area and single-layer GO (SLGO) films. As mentioned above, GO films have

Piezoelectricity of hexagonal boron nitrides improves bone tissue generation as tested on osteoblasts

• Sevin Adiguzel,
• Nilay Cicek,
• Zehra Cobandede,
• Feray B. Misirlioglu,
• Hulya Yilmaz and
• Mustafa Culha

Beilstein J. Nanotechnol. 2025, 16, 1068–1081, doi:10.3762/bjnano.16.78

• alternating boron and nitrogen atoms, with a bond length of ≈1.45 Å and an AA stacking arrangement held together by σ bonds. Between adjacent hBN layers, the B–N atoms are bound by weak van der Waals forces, contributing to a wide bandgap of 3.9–4.6 eV, influenced by significant electronegativity differences

Soft materials nanoarchitectonics: liquid crystals, polymers, gels, biomaterials, and others

• Katsuhiko Ariga

Beilstein J. Nanotechnol. 2025, 16, 1025–1067, doi:10.3762/bjnano.16.77

• other materials into layers [255][256][257][258][259]. Polymer materials are of significant value as components of soft materials, and can be employed in the creation of a vast array of structures. The following section will present examples of research into polymer-based soft materials

Time-resolved probing of laser-induced nanostructuring processes in liquids

• Maximilian Spellauge,
• David Redka,
• Mianzhen Mo,
• Changyong Song,
• Heinz Paul Huber and
• Anton Plech

Beilstein J. Nanotechnol. 2025, 16, 968–1002, doi:10.3762/bjnano.16.74

Synthesis of biowaste-derived carbon-dot-mediated silver nanoparticles and the evaluation of electrochemical properties for supercapacitor electrodes

• Navya Kumari Tenkayala,
• Chandan Kumar Maity,
• Md Moniruzzaman and
• Subramani Devaraju

Beilstein J. Nanotechnol. 2025, 16, 933–943, doi:10.3762/bjnano.16.71

• devices store charge across the electric double layers [3]. Supercapacitors are highly sought-after energy storage devices, as their high power density, ultrastability, and rapid charge–discharge capability render them irreplaceable by traditional metal-ion batteries [4]. Typically, the functioning of

• graph that as the scan rates are increased, the current densities rise owing to the quicker diffusion kinetics on the electrode surface [37]. A lower scan rate means that the entire voltammogram takes longer to complete than a high scan rate. At low scan rates, diffusion layers extend further from the

Focused ion beam-induced platinum deposition with a low-temperature cesium ion source

• Thomas Henning Loeber,
• Bert Laegel,
• Meltem Sezen,
• Feray Bakan Misirlioglu,
• Edgar J. D. Vredenbregt and
• Yang Li

Beilstein J. Nanotechnol. 2025, 16, 910–920, doi:10.3762/bjnano.16.69

• currents. Deposition rate, material composition, and electrical resistivity were examined and compared with layers deposited at comparable settings with a standard gallium (Ga) FIB. The deposition rate is found to depend linearly on the current density. The rate is comparable for Cs+ and Ga+ under similar

• Cs+ FIB in comparison to results of layer deposition induced by Rb+ and Ga+. Pt was deposited at different acceleration voltages and ion beam currents to evaluate the deposition rate and the electrical resistivity of the layers. To measure the grain structure as well as the material composition using

• avoid, for example, any inhomogeneous ripple structures. The dwell time was always 200 ns. For growth rate characterization, Pt layers with a length of 20 μm and a width of 1 μm were deposited on silicon (Si). The ion beam currents were changed, while the pattern size was kept constant. With the Cs+ FIB

Characterization of ion track-etched conical nanopores in thermal and PECVD SiO₂ using small angle X-ray scattering

• Shankar Dutt,
• Rudradeep Chakraborty,
• Christian Notthoff,
• Pablo Mota-Santiago,
• Christina Trautmann and
• Patrick Kluth

Beilstein J. Nanotechnol. 2025, 16, 899–909, doi:10.3762/bjnano.16.68

• different growth mechanisms, the resulting layers have different properties [47][48] and it can be expected that the track-etched nanopores also show different characteristics, including the track etching process itself. Understanding how the different fabrication methods influence the characteristics of

• typically differ in morphology, density, and stoichiometry compared to thermally grown SiO2. The electronic energy loss (Se) in the thermal and PECVD SiO2 layers was calculated using the SRIM2008 code [49]. The average Se values for thermal SiO2 for 1.6 GeV, 185 MeV, and 89 MeV Au irradiation are 21.1, 16.6

• calculations for PECVD SiO2 thin films used values for the density and composition from our previous study [47]. In both layers, the projected ranges when irradiated with 185 and 89 MeV Au ions were ≈20 μm and ≈14 μm, respectively, whereas the projected ranges for thermal and PECVD SiO2 irradiated with 1.6 GeV

Heat-induced transformation of nickel-coated polycrystalline diamond film studied in situ by XPS and NEXAFS

• Olga V. Sedelnikova,
• Yuliya V. Fedoseeva,
• Dmitriy V. Gorodetskiy,
• Yuri N. Palyanov,
• Elena V. Shlyakhova,
• Eugene A. Maksimovskiy,
• Anna A. Makarova,
• Lyubov G. Bulusheva and
• Aleksandr V. Okotrub

Beilstein J. Nanotechnol. 2025, 16, 887–898, doi:10.3762/bjnano.16.67

• coating on the electronic structure and chemical state of graphite layers formed on the surface of a polycrystalline diamond (PCD) film with mixed grain orientation was studied. A synthetic single-crystal diamond (SCD) with a polished (110) face was examined for comparison. The samples were coated with a

• crystallites; however, the layer defectiveness increased in areas with fine-dispersed crystallites. According to NEXAFS and Raman spectroscopy data, the most ordered atomic structure of graphitic layers was obtained by annealing nickel-coated SCD. The angular dependence of NEXAFS C K-edge spectra of nickel

• -coated (110) face after annealing discovered the vertical orientation of sp2-hybridized carbon layers relative to the diamond surface. The observed behavior suggests that sp2 carbon layers were formed on the diamond surface due to its saturation by released carbon atoms as a result of etching by nickel

Ar⁺ implantation-induced tailoring of RF-sputtered ZnO films: structural, morphological, and optical properties

• Manu Bura,
• Divya Gupta,
• Arun Kumar and
• Sanjeev Aggarwal

Beilstein J. Nanotechnol. 2025, 16, 872–886, doi:10.3762/bjnano.16.66

• strain in the implanted layers; thus, the microstrain values increase with fluence [24]. Strain in implanted ZnO films arises primarily from lattice mismatch, which is due to the difference in thermal expansion coefficients between film and substrate. Also, when argon ions are implanted into the ZnO

Insights into the electronic and atomic structures of cerium oxide-based ultrathin films and nanostructures using high-brilliance light sources

• Paola Luches and
• Federico Boscherini

Beilstein J. Nanotechnol. 2025, 16, 860–871, doi:10.3762/bjnano.16.65

• sensitivity of the method and to selectively probe the surface and or deeper layers, like buried interfaces. Since the early studies of epitaxial cerium oxide films by Mullins and coworkers [22], it became clear that synchrotron radiation could provide high-resolution Ce 3d, Ce 4d, and valence band spectra

• that form the film, while the Pt ions in the 2+ oxidation state are confined at the outermost layers [29]. The interplay of ceria surfaces with adsorbed molecules, a crucial factor in understanding reactivity, has become a significant research focus, also thanks to synchrotron-radiation-based XPS

• -ray irradiation. The observed effect was identified as responsible for the enhanced catalytic activity of mixed ceria–zirconia materials in the applications [39]. Photoemission is a technique with a sensitivity limited to the topmost surface layers. In typical resonant photoemission experiments on