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Search for "TEM" in Full Text gives 770 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
On the mechanism of piezoresistance in nanocrystalline graphite
Beilstein J. Nanotechnol. 2024, 15, 376–384, doi:10.3762/bjnano.15.34
- corresponds to a crystallite size of 4–5 nm. TEM studies also done in our previous work on NCG gave an average domain size of 3 nm. We therefore report a grain size range of 2–5 nm for the NCG film synthesized for this study. Figure 3b shows the Raman spectra as a waterfall plot for strain values up to 0.36
Investigating ripple pattern formation and damage profiles in Si and Ge induced by 100 keV Ar+ ion beam: a comparative study
Beilstein J. Nanotechnol. 2024, 15, 367–375, doi:10.3762/bjnano.15.33
- microscopy (AFM) [3] and transmission electron microscopy (TEM), it is possible to visualize these features. Formation of dots, ripples, and pits have been well studied using IBS [4][5][6][7][8][9]. In the last few decades, numerous efforts have been made to understand IBS through simulations [10] as well as
- . The RBS measurements were performed in channelling mode using 2 MeV He+ ions at the PARAS facility at the Inter University Accelerator Centre (IUAC), New Delhi, and transmission electron microscopy (TEM) using an equipment from Jeol, Japan. The samples for TEM were prepared for cross-sectional studies
- in the TEM sample preparation lab at IUAC, New Delhi. Results and Discussion Atomic force microscopy studies Energetic ions, of a few hundreds of kiloelectronvolts, from the ion implanters modify the surface of the target material to grow nanopatterns. The surfaces of the pristine and ion-treated
Comparative electron microscopy particle sizing of TiO2 pigments: sample preparation and measurement
Beilstein J. Nanotechnol. 2024, 15, 317–332, doi:10.3762/bjnano.15.29
- could not be ruled out” [7]. Recently, papers have been published in which a number of E171 samples were found by transmission electron microscopy (TEM) to be nanomaterials according to the EU definition [8][9]. For TiO2 producers this is surprising as the former food-grade titanium dioxide E171 is
- samples in 2023. Three of the reported measurements were made by SEM and three by TEM. The following three images (Figures 3–5) illustrate typical images used for the different methods. A top-view SEM image is shown in Figure 3 (Precheza M2, Venator M3), Figure 4 is an example of a TEM image (RCPTM, P1
- particle sizes is the sample preparation: With preparation methods P1 and P6, only a small fraction (1/200 to 1/5000) of the initially prepared 2.5 mg of sample is finally transferred to the TEM grid, whereas methods M1, M2, and M3 all bring macroscopic sample amounts to the microscope. Methods RCPTM, M2
Quantitative wear evaluation of tips based on sharp structures
Beilstein J. Nanotechnol. 2024, 15, 230–241, doi:10.3762/bjnano.15.22
- . Orji et al. [14] utilized a transmission electron microscope (TEM) to image a tip and derived its tapered shape from the TEM image. Electron microscopic observation offers the advantages of high precision and resolution, enabling accurate acquisition of morphological information about the tip. However
Graphene removal by water-assisted focused electron-beam-induced etching – unveiling the dose and dwell time impact on the etch profile and topographical changes in SiO2 substrates
Beilstein J. Nanotechnol. 2024, 15, 190–198, doi:10.3762/bjnano.15.18
- advanced TEM cross-sectional analysis would be needed. Conclusion The feasibility of water-assisted FEBIE, available on scanning electron microscopes operating in low-vacuum mode, makes the method very promising for prototyping various optical/electronic devices based on graphene. In this work, we showed
Ferromagnetic resonance spectra of linear magnetosome chains
Beilstein J. Nanotechnol. 2024, 15, 157–167, doi:10.3762/bjnano.15.15
- number of nanoparticles and type of chain anisotropy accepted makes it possible to obtain statistically significant results for the magnetic susceptibility of a dilute assembly of linear chains. Results and Discussion An analysis of transmission electron microscope (TEM) images [1][2][8][38][39] shows a
- is also the average distance a between the centers of particles in the chain, since this distance determines the amplitude of the dipole field Hdip, acting between the particles of the chain. Based on the TEM data [1][2][7][8][38][39], it can be concluded that the nearest distance between the
Development and characterization of potential larvicidal nanoemulsions against Aedes aegypti
Beilstein J. Nanotechnol. 2024, 15, 104–114, doi:10.3762/bjnano.15.10
- aqueous media [37]. According to NTA measurements, the Cym-NE particle size was 145.7 ± 7.7 nm, while the Myr-NE particle size was 126.4 ± 5.6 nm, confirming the nanometric droplet size. Cryogenic transmission electron microscopy Cryogenic transmission electron microscopy (cryo-TEM) is one of the most
- useful techniques for the investigation of NEs, since it provides detailed information about the internal structure of colloidal systems observed in their native state [38]. In cryo-TEM, it was possible to observe spherical droplets (Figure 1). Similar results of spherical droplets smaller than 180 nm
- were observed with cryo-TEM [39]. This technique is widely used to characterize the morphology of nanoemulsions and faithfully confirms the results obtained with other techniques [40]. In vitro drug release One potential advantage of using NEs is their ability to enhance drug solubility and
Berberine-loaded polylactic acid nanofiber scaffold as a drug delivery system: The relationship between chemical characteristics, drug-release behavior, and antibacterial efficiency
Beilstein J. Nanotechnol. 2024, 15, 71–82, doi:10.3762/bjnano.15.7
- powder. (b) TEM image of BBR NPs. (c) Digital image of the electrospun nanofiber scaffolds. (d, d’), (e, e’), (f, f’) SEM images and the distribution of fiber diameter of electrospun PLA, BBR/PLA, and BBR NPs/PLA nanofiber scaffolds, respectively. FTIR spectra of (a) PLA, (b) BBR/PLA, and (c) BBR NPs/PLA
TEM sample preparation of lithographically patterned permalloy nanostructures on silicon nitride membranes
Beilstein J. Nanotechnol. 2024, 15, 1–12, doi:10.3762/bjnano.15.1
- submicrometer apertures were milled on SiN membranes using a focused ion beam. Furthermore, we have developed a new TEM sample preparation method, where we fabricated Py nanostructures on a bulk substrate with a SiN buffer layer and etched the substrate to create a thin SiN membrane under the Py nanostructure
- ], transmission electron microscopy (TEM) [1][8][9][10][11], scanning transmission X-ray microscopy [12][13], and magneto-optical Kerr effect microscopy [14][15]. Possible applications of Py nanodisks were proposed for zero-hysteresis magnet sensors, magnetic logic devices, and data storage [16]. Py is a nickel
- –iron alloy (80 atom % Ni and 20 atom % Fe) that has a small coercive field (Hc) [17] and low magnetostriction (λs) [18], as well as high permeability and high saturation magnetization (Ms) [19]. TEM offers high spatial resolution for magnetic imaging. TEM-based magnetic imaging techniques such as
Determination of the radii of coated and uncoated silicon AFM sharp tips using a height calibration standard grating and a nonlinear regression function
Beilstein J. Nanotechnol. 2023, 14, 1200–1207, doi:10.3762/bjnano.14.99
- relation to the PSD were collected to observe the tip blunting behavior. The quantitative determination of the tip radii compared to transmission electron microscopy (TEM) images of the tips showed corresponding results between the blunted tips and the PSD curves, concluding that blunter tips produced a
A combined gas-phase dissociative ionization, dissociative electron attachment and deposition study on the potential FEBID precursor [Au(CH3)2Cl]2
Beilstein J. Nanotechnol. 2023, 14, 1178–1199, doi:10.3762/bjnano.14.98
Sulfur nanocomposites with insecticidal effect for the control of Bactericera cockerelli
Beilstein J. Nanotechnol. 2023, 14, 1106–1115, doi:10.3762/bjnano.14.91
- eucalyptus and rosemary at different concentrations. Characterizations were carried out through UV–visible spectroscopy, energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM); also the insecticidal efficacy of the NCMPs for the control of
- , and O, corresponding to the by-products of the reduction of sodium thiosulfate to sulfur (see Experimental section), were found [19][31][34]. Carbon is from the substrate used in the EDS analysis [35][36]. The TEM micrograph in Figure 3a reveals the formation of spherical SNPs that agglomerate into
- distribution were calculated. UV–vis spectrum of SNPs. (a) SEM micrograph and (b) EDS spectrum of synthesized SNPs. (a) TEM micrograph of synthesized SNPs and (b) density function. STEM micrographs (left) and density plots (right) of eucalyptus nanocomposites with oil concentrations of (a) 0.25%, (b) 0.5%, and
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
- of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, https://creativecommons.org/licenses/by-nc-nd/4.0/). This content is not subject to CC BY 4.0.) Shape-dependent photothermal properties. TEM image of gold nanostructures (A). (Figure 6A was adapted from [61
- Commons Attribution 4.0 International License, https://creativecommons.org/licenses/by/4.0).). TEM images of gold crosses (E). (Figure 6D and E was reprinted with permission from [62], Copyright 2011 American Chemical Society. This content is not subject to CC BY 4.0.). Absorbance and TEM images of
Isolation of cubic Si3P4 in the form of nanocrystals
Beilstein J. Nanotechnol. 2023, 14, 971–979, doi:10.3762/bjnano.14.80
- nanoparticles with a defective zinc blende structure under mild conditions through thermal annealing of hydrogenated silicon nanoparticles with red phosphorus. The synthesized Si3P4 nanoparticles were analyzed using FTIR, XRD, electron diffraction, EDX, TEM, Raman spectroscopy, X-ray fluorescence spectrometry
- Si3P4 decomposition, sample SP670 as well as the freshly prepared sample SP550 were selected for the TEM studies. A typical TEM bright-field image is shown in Figure 6a. The particles show a profound tendency to agglomerate, not unlike the parent oxidized Si NPs [38]. The agglomeration obstructs size
- control over the width of the bandgap through selection of the composition. Conclusion A synthesis of freestanding Si3P4 NPs with cubic crystal structure was successfully carried out and corroborated by XRD, TEM, EDX, electron diffraction, and Raman spectroscopy. The cell parameter of the experimentally
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- CoAl-LDH synthesis method. We thoroughly study the effects of the mass scale-up (25-fold: up to 375 mM) and the volumetric scale-up (20-fold: up to 2 L). For this, we use a combination of several structural (XRD, TGA, and N2 and CO2 isotherms), microscopic (SEM, TEM, and AFM), magnetic (SQUID), and
- CoAl-based LDH synthesis through an ARR method had been demonstrated, morphological aspects were addressed by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM) (Figure 4 and Figure 5). For reference x1, well-defined hexagonal single
- corresponding structure. Microscopy Sample preparation The dried solids were suspended in ethanol and drop cast onto Au TEM grids covered with a lacy carbon film, and the solvent was left to evaporate. SEM samples were prepared from the same solution after 5 min of ultrasonication. The sonicated suspension was
Green SPIONs as a novel highly selective treatment for leishmaniasis: an in vitro study against Leishmania amazonensis intracellular amastigotes
Beilstein J. Nanotechnol. 2023, 14, 893–903, doi:10.3762/bjnano.14.73
- , arrowheads). The ferrous nature of the observed structures was assessed by chemical element mapping analysis using energy-dispersive X-ray spectroscopy (Figure 2C), confirming that the electron-lucent structures contain iron atoms (Figure 2D). Transmission electron microscopy (TEM) was used to confirm the
- internalization of the SPIONs. First, promastigotes were treated with 100 µg/mL of SPIONs for 24 h (Figure 3A–C). TEM images confirmed the presence of SPION aggregates randomly distributed throughout the cytoplasm of the promastigotes (Figure 3A–C, arrowheads). The images suggest that these aggregates have
- , different from most compounds, drugs, and nanomaterials developed in the last decades. During TEM analyses, we observed that intracellular amastigotes were undergoing substantial ultrastructural alterations (Figure 5) when treated with SPIONs. These alterations include (1) accumulation of lipid bodies, (2
Ultralow-energy amorphization of contaminated silicon samples investigated by molecular dynamics
Beilstein J. Nanotechnol. 2023, 14, 834–849, doi:10.3762/bjnano.14.68
- substantially more controllable at low energies [10][11], which also makes such beams valid candidates for these processes. Another application includes lamella preparation for transmission electron microscopy (TEM). TEM and scanning electron microscopy (SEM) have high constraints regarding cleanliness [12
- ]. TEM samples require a small thickness [13] to be electron transparent and are usually prepared through ion milling processes [14][15], which rely heavily on the precise ablation of materials to preserve the crystalline structure of the analyzed sample. These samples, usually shaped as lamellas, are
- example, for the preparation of TEM samples. Furthermore, we performed binary collision approximation (BCA) simulations on pristine silicon using the SDTrimSP code [49]. In Figure 10, the sputtering yields are plotted, as well as a comparison between the three sputtering simulations of the silicon sample
Nanostructured lipid carriers containing benznidazole: physicochemical, biopharmaceutical and cellular in vitro studies
Beilstein J. Nanotechnol. 2023, 14, 804–818, doi:10.3762/bjnano.14.66
- different types of nanoparticles and BNZ, including SLN and NLC [21]. The NLC-BNZ formulation was analyzed using transmission electron microscopy (TEM) to confirm the presence of nanoparticles showing a spherical morphology and a narrow distribution of sizes (Figure 1). Image analysis through ImageJ [22
- increasing in the third month up to 155 nm. The Z-average parameter was chosen to report the nanoparticles size. The size values were consistent with the TEM image analysis. The zeta potential (ζ) was measured by Doppler anemometry and operated as a report of the formulation surface characteristics. The
- with acceptable particle size, PdI, and EE%. Complementary to these results, TEM images showed a spherical configuration. Thermal and crystallographic experiments indicated that BNZ was dispersed into the lipid matrix. The formulations showed a sustained drug release profile for 24 h, achieving a
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
- occurred at 187 and 183 °C, respectively. These results suggest that the nanocomposites should be used in temperature regions below 200 °C. TEM images and size distributions of AgNPs@Lac/Alg are displayed in Figure 5. The TEM images demonstrate the presence of uniformly shaped spherical AgNPs. The size
- 10. The zeta potentials of the nanocomposite were −23.3, −27.5, and −13.3 mV at pH 4, 6, and 12, respectively, indicating that the stability of the nanocomposite was low in highly acidic and basic media, leading to the aggregation of nanoparticles. TEM images demonstrated significant variations in
- morphology of the nanocomposites was investigated using transmission electron microscopy (TEM) with a JEOL JEM-1400 instrument. Thermal analysis, including thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC), was conducted using a LabSys Evo 1600 thermal analyzer (SETARAM, France
Carboxylic acids and light interact to affect nanoceria stability and dissolution in acidic aqueous environments
Beilstein J. Nanotechnol. 2023, 14, 762–780, doi:10.3762/bjnano.14.63
- representative of particle dissolution, due to the valence state change from Ce4+ to Ce3+ during dissolution. The particles in citric acid exposed to light were completely dissolved after four weeks as indicated by DLS and transmission electron microscopy (TEM), shown in Table 1 and Table 2, respectively. In
- aggregation of nanoceria was also shown by Muhammad and co-workers [35]. TEM analysis TEM analysis was conducted on two samples, citric and β-hydroxybutyric acid, to compare to the DLS results. They were chosen to represent samples from groups one and four. In the presence of light, nanoceria exposed to
- citric acid did not agglomerate and completely dissolved within two weeks. In contrast, particles exposed to β-hydroxybutyric acid agglomerated within four weeks. Shown in Table 2 are TEM images at varying magnifications of each sample exposed to light or stored in the dark. Nanoceria particles exposed
In situ magnesiothermic reduction synthesis of a Ge@C composite for high-performance lithium-ion batterie anodes
Beilstein J. Nanotechnol. 2023, 14, 751–761, doi:10.3762/bjnano.14.62
- demonstrate the enhanced contact between the in situ formed Ge and the carbon matrix, which promotes conductivity, accommodates volume variation, and ultimately improves the electrochemical performance of the material. The morphology of the materials was observed using FE-SEM and HR-TEM. As shown in Figure 2a
- , the spherical Ge nanoparticles are quite uniform, with dimensions of several nanometers. In Figure 2b, the composite Ge/C-iM750 combines Ge nanoparticles with porous activated carbon. The texture of Ge@C composites was observed using TEM. According to Figure 2d–f, the Ge nanoparticles in Ge/C-iM750
- microscopy (HR-TEM, JEOL JEM-2100F) were conducted for morphology and particle size investigation. A well-blended mixture of active material, conductive carbon C65, and polyvinylidene fluoride (PVDF) binder with a mass ratio of 75:15:10 in N-methyl-2-pyrrolidone solvent was used for fabricating the working
Control of morphology and crystallinity of CNTs in flame synthesis with one-dimensional reaction zone
Beilstein J. Nanotechnol. 2023, 14, 741–750, doi:10.3762/bjnano.14.61
- source, showed that different growth temperatures produce CNTs with similar crystallinity. In a study by Chong et al. [12], the combustion of propane in a premixed flame at varying equivalence ratios yielded similar effects on CNT growth, while transmission electron microscopy (TEM) analysis showed a
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
- significantly. Therefore, it can be inferred that not only quantum size effects, but also defects on the surface, contribute to the PL in GQDs. Size and morphology of GQDs were characterized using TEM and AFM. The TEM micrographs shown in Figure 3a confirm the formation of evenly dispersed GQDs with almost
- -based nanosensor described here could be used in future to develop portable monitoring systems for water contamination. Fabrication of the GQDs/GCE electrochemical nanosensor for the detection of malathion. (a) UV–vis absorption spectrum and (b) photoluminescence spectra of GQDs. (a) TEM image, (b) size
- electrode materials.a Acknowledgements The authors would like to thank Mr. Sumit Sharma, Research Scholar, IIT Bombay for XRD and TEM imaging. Author Contributions Sanju Tanwar: conceptualization, research methodology, experimental design, electrochemical investigation, original draft writing and
Titania nanoparticles for photocatalytic degradation of ethanol under simulated solar light
Beilstein J. Nanotechnol. 2023, 14, 616–630, doi:10.3762/bjnano.14.51
- with high purity, which did not require thermal treatment after synthesis (ca. 1 atom % of impurities). These nanoparticles show an increased anatase phase content (77.33–87.42%) and crystallite sizes of 23–45 nm. The TEM images showed that in both series small crystallites form spheroidal
- , respectively, with increasing pressure in the reaction chamber. The TEM analysis reveals that the TiO2 crystallites tend to arrange in bigger spherical particles (Figure 2a,b). This tendency is more pronounced as the pressure in the reaction chamber increases. The average particles sizes for TO-250-a, TO-450-a
- diffraction (XRD) patterns, measured by an X-ray diffractometer Panalytical X’Pert MPD theta–theta, and the morphological properties were determined by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected-area electron diffraction (SAED) measurements
ZnO-decorated SiC@C hybrids with strong electromagnetic absorption
Beilstein J. Nanotechnol. 2023, 14, 565–573, doi:10.3762/bjnano.14.47
- of SiC nanomaterials through surface carbonization of SiC nanowires and hydrolysis. SiC@C-ZnO composites were synthesized with different dosages of ZnNO3·6H2O. Composition, microstructure, and electromagnetic properties of the composites were characterized and analyzed. Results from TEM and XRD show
- of Si atoms from SiCnw in the carbonization atmosphere containing a low concentration of chlorine gas [24]. Figure 2 shows TEM and HRTEM images of the final SiC@C-ZnO samples. The SCZ samples are composed of SiC, carbon, and ZnO particles. Obviously, the hybrids are characterized by SiC cores and
- Zn 2p1/2, respectively. This proves that Zn exists in the form of Zn2+ [33]. Besides, it is obvious that the relative intensity of the two Zn 2p peaks gradually increases as a function of the ZnNO3·6H2O dosage, suggesting an increasing fraction of ZnO in the samples. This is consistent with the TEM
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