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Search for "absorption" in Full Text gives 986 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
CdSe/ZnS quantum dots as a booster in the active layer of distributed ternary organic photovoltaics
Beilstein J. Nanotechnol. 2024, 15, 144–156, doi:10.3762/bjnano.15.14
- studies on CdSe/ZnS nanodots as dopants in a polymer–fullerene matrix for application in organic solar cells. An assembly of poly(3-hexylthiophene-2,5-diyl) and 6,6-phenyl-C71-butyric acid methyl ester was used as the active reference layer. Absorption and luminescence spectra as well as the dispersion
- efficiencies is ternary organic cells [3][4][5][6]. The idea of ternary organic cells is to introduce additional material (donor or acceptor) into a typical donor–acceptor active layer in the bulk heterojunction (BHJ). This arrangement is supposed to combine the absorption of the three components to obtain
- -transporting layers [24], active absorbing layers, and other components [25][26]. Inorganic quantum dots are considered substitutes for fullerene acceptors. Their biggest advantages are a tunable band gap, various absorption spectra, and comparatively high mobility of carriers [27][28]. The application of
In situ optical sub-wavelength thickness control of porous anodic aluminum oxide
Beilstein J. Nanotechnol. 2024, 15, 126–133, doi:10.3762/bjnano.15.12
- absorption and photoluminescence characteristics of PAAO [38]. In order to achieve nanometer-scale thickness uniformity of the PAAO layers (Figure 4), it was necessary to use single-crystal aluminum substrates as starting material. In previous studies it was shown that anodization of polycrystalline aluminum
Assessing phytotoxicity and tolerance levels of ZnO nanoparticles on Raphanus sativus: implications for widespread adoptions
Beilstein J. Nanotechnol. 2024, 15, 115–125, doi:10.3762/bjnano.15.11
- (p < 0.05) in soluble protein content by 23.1%, accompanied by a notable increase in IAA by 31.1%, indicating potential toxicity. The use of atomic absorption spectroscopy confirmed the internalization of zinc in seedlings, with a statistically significant increase (p < 0.05). In control plants
- (Figure 1c) shows significant absorption peaks at 545, 718, 902, 2028, and 2159 cm−1. The UV–vis spectrum of synthesized ZnO-NPs displays a broad band at 362 nm (Figure 1d). The SEM images (Figure 1e) confirmed that ZnO NPs have spherical morphology with an average diameter of 70 nm. Phytotoxicity of ZnO
- . Zn contents in seedlings The successful Zn internalization was confirmed by atomic absorption spectroscopy (AAS) analysis (Figure 5a) indicating that R. sativus can accumulate Zn at high concentrations (0.36 mg Zn g−1 DW of seedlings at 0 mg/L and 1.76 mg Zn g−1 DW of seedlings at 10,000 mg/L, p
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
- lambda 25 UV–vis spectrometer was employed for UV–vis absorption measurement in the range of 200–800 nm. The morphology and shape of NPLs were studied using a field-emission scanning electron microscope (Supra 400VP, Zeiss, Oberkochen, Germany). Dynamic light scattering experiments were carried out at
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
- bond in carboxylic groups. The two bands at 1182 cm−1 and 1087 cm−1 were attributed to the C–O–C binding vibrations. The absorption bands at 2992 cm−1 and 2947 cm−1 were characteristics of asymmetrical and symmetrical stretching vibrations of the C–H bond, while the asymmetrical vibrations of –CH3
- nanofiber scaffold. This was due to the O–H stretching vibration of the glycerol component in BBR NPs (Figure 2). Peculiarly, the absorption bands at 1646 cm−1 and 1506 cm−1, characteristic of the C=N+ double bond and the furyl group in the molecular structure of BBR, respectively, were only displayed in
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
- metabolites), flexibility with high mechanical strength, chemical and thermal resistance, high rate of reversible fluid absorption, and low interfacial tension with water [6][7]. A very desirable property of hydrogels is the ability to incorporate or suspend various particles in their structure, such as dyes
Curcumin-loaded nanostructured systems for treatment of leishmaniasis: a review
Beilstein J. Nanotechnol. 2024, 15, 37–50, doi:10.3762/bjnano.15.4
- solubility, (ii) poor gastrointestinal absorption, (iii) high rates of metabolism, (iv) inactivity of metabolic products, and (v) rapid elimination and clearance [15][16]. To get around these several limitations, nanotechnological systems such as nanoemulsions [17], microemulsions [18], self-nanoemulsifying
- antileishmanial potential, curc has several drawbacks, such as: (i) low aqueous solubility, (ii) rapid clearance, (iii) low tissue absorption, and (iv) notable chemical degradation (neutral and alkaline pH), which severely reduces its bioavailability and hinder its clinical use [18][53][54]. Given this scenario
Measurements of dichroic bow-tie antenna arrays with integrated cold-electron bolometers using YBCO oscillators
Beilstein J. Nanotechnol. 2024, 15, 26–36, doi:10.3762/bjnano.15.3
- of numerical simulation. The aim of the optimization was to bring the absorption bandwidth in line with the current requirements for the LSPE receiving system. According to these requirements, the width of the absorption line should be 20% of the operating frequency for the 210 GHz channel and 10% of
- curves for a Si substrate thickness of 290 µm (dashed curves). As a result of frequency response optimizations, the following characteristics were obtained: The bandwidth for the 210 GHz channel at half power level is 25.46 GHz, and the maximum absorption occurs at a frequency of 212.1 GHz; the bandwidth
- for the 240 GHz channel is 34.8 GHz, and the maximum absorption occurs at a frequency of 239.6 GHz. Fabrication of samples of receiving systems with CEBs The samples and the sample blanks with electronic lithography, ready for electron beam evaporation, were fabricated at the Chalmers University of
Nanotechnological approaches in the treatment of schistosomiasis: an overview
Beilstein J. Nanotechnol. 2024, 15, 13–25, doi:10.3762/bjnano.15.2
- pharmacokinetics parameters. The nanoformulations were evaluated through efficacy criteria (e.g., parasite burden, egg counts, and granuloma diameter) or using traditional pharmacokinetics parameters (e.g., absorption rate or bioavailability). For example, Labib El Gendy et al. [49] showed that PZQ encapsulated in
- a bioavailability improvement. That is because bioavailability of orally administered drugs depends on their ability to be absorbed in the gastrointestinal tract. For class II drugs (e.g., PZQ) the absorption process is limited by drug dissolution rate in gastrointestinal media. Therefore
- vivo. Mishra et al. [97] demonstrated similar conclusions using PZQ associated with solid lipid nanoparticles. Malhado et al. [98] concluded that PZQ associated with PMMA nanoparticles could not improve the pharmacokinetic curve. In fact, the absorption of the encapsulated drug was three times lower
Fluorescent bioinspired albumin/polydopamine nanoparticles and their interactions with Escherichia coli cells
Beilstein J. Nanotechnol. 2023, 14, 1208–1224, doi:10.3762/bjnano.14.100
- (Supporting Information File 1, Figure S3b,c), respectively, in agreement with the color of the corresponding dye. Pristine BSA/PDA-NPs exhibited a wide absorption spectrum with a maximum of absorption at 280 nm, whereas Ox-PDA/BSA-NPs showed a less broad and intense absorption with a maximum at 285 nm
- (Figure 4a). In other words, the oxidation leads to a bathochromic (increase in wavelength) shift due to an increase in conjugation when –OH groups were oxidized into =O groups. Moreover, a hypochromic (decrease in absorption intensity) effect was measured, which may have resulted from the degradation of
- to heat up under irradiation by non-radiative relaxation. This is favorable to minimize the superposition between absorption and emission peaks, but might lead to a low quantum yield and, thus, poor emission intensity. Indeed, the quantum yield of Ox-BSA/PDA NPs in water (Φ) was calculated to be 0.1
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
- nanostructures are critical for the enhancement of absorption and controlled scattering of light [10]. Focused-electron-beam-induced deposition (FEBID) is a direct writing method for controlled deposition/fabrication of nanostructures on either flat or nonflat surfaces. It offers excellent shape control and thus
Curcumin-loaded albumin submicron particles with potential as a cancer therapy: an in vitro study
Beilstein J. Nanotechnol. 2023, 14, 1127–1140, doi:10.3762/bjnano.14.93
- pharmacokinetic drawbacks such as poor water solubility resulting in low bioavailability, low absorption, rapid metabolism, and elimination [6][7]. The reported solubility of free CUR in distilled water at 25 °C is 1.34 µg/mL [8]. The conjugation of CUR with proteins has been confirmed to improve its aqueous
- and turbid, corresponding to aggregated CUR. CUR incorporated into HSA-MPs yields a colloidal solution of yellowish-brown color, indicating CUR absorption into porous HSA-MPs. In contrast, control albumin particles have a creamy-white color (see below in Figure 2A). Forming a turbid suspension, CUR
- 1644 and 1546 cm−1 indicated the vibration adsorption of amide I (C=O stretching) and amide II (C–N stretching and N–H bending vibrations), respectively. These are the main vibrational bands in the albumin backbone that formed the secondary structure of the protein. It is also seen that the absorption
Sulfur nanocomposites with insecticidal effect for the control of Bactericera cockerelli
Beilstein J. Nanotechnol. 2023, 14, 1106–1115, doi:10.3762/bjnano.14.91
- different chemical methods [18][19]. Elemental sulfur nanoparticles (SNPs) have already demonstrated significant insecticidal, fungicidal, and bactericidal activity [20][21]. By manipulating particle size and surface area, SNPs can exhibit higher absorption, increase the efficacy of new insecticide
- nymphs of paratrioza was evaluated. Results and Discussion Sulfur nanoparticles Figure 1 shows the UV–visible spectrum of the synthesized SNPs. A maximum absorption peak was observed at 253 nm. This absorption due to the n→σ* transition of nonbonding electrons is a confirmation of SNP formation [28][29
- ]. Furthermore, it is well known that α-sulfur shows a maximum absorption peak in the range of 250 to 400 nm [30][31]. Other researchers found clear light absorption peaks of SNPs at 240, 260 and 280 nm [32][33]. EDS analysis (Figure 2) shows the presence of sulfur at a fraction of 28 wt %. In addition, Na, Cl
Properties of tin oxide films grown by atomic layer deposition from tin tetraiodide and ozone
Beilstein J. Nanotechnol. 2023, 14, 1085–1092, doi:10.3762/bjnano.14.89
- grazing incidence X-ray diffractometry (GIXRD), using an X-ray diffractometer SmartLab Rigaku with Cu Kα radiation, which corresponds to an X-ray wavelength of 0.15406 nm. X-ray photoelectron emission and X-ray absorption spectroscopy (XPS and XAS, respectively) measurements were made at the FinEstBeAMS
- eV binding energy, whereas the peak at 5 eV is not as dominant [28][29][35]. X-ray absorption spectra (Figure 11) were additionally recorded to possibly detect any differences between the samples. The Sn 3d XAS band is constituted by transitions from the 3d core orbital to the unoccupied p and f
- octahedron and the linking direction of these octahedra. We note that any eventual contribution from SnO (i.e., due to non-complete oxidation at lower deposition temperatures [39][40]) would show a quite different O 1s absorption spectrum with the lowest energy maximum downshifted by ca. 1 eV [28][29][35][36
Dual-heterodyne Kelvin probe force microscopy
Beilstein J. Nanotechnol. 2023, 14, 1068–1084, doi:10.3762/bjnano.14.88
- depositing caesium lead halide perovskite nanosheets (NSs) on a highly oriented pyrolytic graphite (HOPG) substrate. Lead halide perovskites have emerged recently as materials with unique optical and electronic properties, such as high absorption coefficients, high defect tolerance, and charge mobility. Due
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
- ][18]. Semiconductors are the heart of photodetectors as their bandgap allows for the absorption of photons in the desired wavelength range [19]. There are many semiconductor materials developed for this application. Among them, zinc oxide (ZnO) has been studied extensively over the last decades
- 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
- ]) to extend the light absorption towards the visible region. Copper oxide (CuO) is a candidate because of its narrow bandgap (ca. 1.35 eV), which is suitable for visible-light detection. Hence, CuO can be a potential material for solving the problem of limited light absorption of ZnO. Conduction 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
- , before being captured by immobilized biomolecules on a test line in the nitrocellulose membrane [6][7]. In conventional LFAs, most commonly gold nanoparticles and coloured cellulose nanobeads have been used as tracer elements because of strong light absorption and surface plasmon resonance, which yield
- the NIR absorption potential, nanomaterials can also be used in the field of photothermal nanosensors, which is an underexplored, yet highly potential, area of research [31]. To use nanoparticles for photothermal applications, the absorption wavelength should lie in the NIR region (650–900 nm
- ). Different types of nanoparticles are used, depending on their physical and chemical properties [28]. Classification of photothermal nanomaterials The photothermal properties of nanomaterials mainly depend on chemistry and architecture of the materials [32]. Nanomaterials exhibiting NIR absorption and
Isolation of cubic Si3P4 in the form of nanocrystals
Beilstein J. Nanotechnol. 2023, 14, 971–979, doi:10.3762/bjnano.14.80
- annealed samples revealed a pronounced absorption band with a maximum at 490–494 cm−1 and a shoulder at ca. 525 cm−1, which is consistent with the earlier assignment of the IR-active T2 mode to the highest-frequency vibration (Figure 4). The synthesized Si3P4 NPs were oxidized on the surface during
- exposure to air, which produced a signal in the wavenumber range of 1130–1100 cm−1. Because of the hydrosylilation step for the sample SP400, its spectrum features prominent signals of organic fragments (Supporting Information File 1, Table S1). Nevertheless, with the absorption of Si–O–Si stretching at
- agglomeration for at least a month. The synthesized samples were brown powders that formed brown sols in acetonitrile, quite similar in appearance to those of Si NPs. Upon examination of the UV–vis absorption spectra, a bandgap of 1.25 eV was established using Tauc plot (Figure 5). A simpler approach for a
Metal-organic framework-based nanomaterials for CO2 storage: A review
Beilstein J. Nanotechnol. 2023, 14, 964–970, doi:10.3762/bjnano.14.79
- coworkers [21]. Under conditions of 296 K and 1 bar, the authors observed that Mg-MOF-74 exhibited the highest CO2 absorption capacity, reaching 8.0 mmol·g−1, followed by Co-MOF-74 with 7.0 mmol·g−1. In contrast, Zn-MOF-74 demonstrated the lowest performance, displaying an adsorption capacity of 5.5 mmol·g
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- process and aiming to quantify the amount of this Co-based α-LH impurity, X-ray absorption spectroscopy (XAS) measurements were performed at the CLÆSS BL22 beamline at the ALBA synchrotron. Figure 2A depicts the X-ray absorption near-edge structure (XANES) spectra for the Co K edge. In all samples, the
- presence of CoII is confirmed regardless of the synthesis conditions [31][50][61]. Nevertheless, sample x25M shows differences in the intensity of the white line and in the resonances behind the absorption edge, compared to the other samples studied. At first glance, this would indicate that, although all
- of the structural features of the scale-up samples determined by extended X-ray absorption fine structure (EXAFS) measurements, the used model, and the corresponding fits can be found in Supporting Information File 1 (Figure S9 and Table S3). Thermal decomposition in both inert (nitrogen) and
Industrial perspectives for personalized microneedles
Beilstein J. Nanotechnol. 2023, 14, 857–864, doi:10.3762/bjnano.14.70
- demographic groups (e.g., ethnicity and age) heal at different rates [16][19]. Therefore, it is also critical to consider differences in skin penetration, drug absorption, and healing processes among different populations when assessing the effectiveness of drug-delivering microneedles. In today's age of
- we divide the body into mobile areas (i.e., joints) and passive areas (e.g., volar forearm), then a one-size-fits-all microneedle design may not satisfy the requirements for both applications [18]. This builds upon previous work from Rougier et al. [23], who demonstrated that drug absorption differs
A wearable nanoscale heart sound sensor based on P(VDF-TrFE)/ZnO/GR and its application in cardiac disease detection
Beilstein J. Nanotechnol. 2023, 14, 819–833, doi:10.3762/bjnano.14.67
- generally associated with better piezoelectric performance of the material. To further validate the enhancement of the β phase, Fourier-transform infrared (FTIR) analysis was conducted (Figure 7a). The FTIR spectrum of the piezoelectric film exhibited distinct absorption bands. Peaks observed at 600, 763
- , and 1071 cm−1 correspond to the α-phase [26], whereas the γ-phase peaks were observed at 812 cm−1 [27][28] and 1234 cm−1 [29]. The polar β-phase was characterized by the absorption bands at 510, 840, 1275, and 1430 cm−1 [30]. From the spectrum, it was evident that the β-phase in the P(VDF-TrFE) + ZnO
- and 840 cm−1, respectively, and Kα and Kβ are the absorption coefficients with values of 6.1 × 104 cm2/mol and 7.7 × 104 cm2/mol, respectively [31]. The calculation results are depicted in Figure 7b, demonstrating a notable enhancement in the β-phase content upon the incorporation of ZnO and GR, which
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
- bioavailability by modifying the absorption, distribution, and elimination of the drug. In this study, BNZ was successfully loaded into nanocarriers composed of myristyl myristate/Crodamol oil/poloxamer 188 prepared by ultrasonication. A stable NLC formulation was obtained, with ≈80% encapsulation efficiency (%EE
- proposed as a strategy to reduce toxicity and improve efficacy [13]. Incorporation of drugs into nanoscale vehicles could result in changes in its absorption, distribution, metabolism, and excretion, which in turn could translate into improved efficacy and diminished BNZ toxicity. For example, BNZ-loaded
- –H flexion in the amide (1500–1400 cm−1 is also the absorption range of the C=C in the benzyl group), 1357 cm−1 to the symmetric vibration of R–NO2, and 1141 cm−1 to C–N in the imidazole ring [26]. Myristyl myristate displayed peaks at 2913 and 2848 cm−1 corresponding to C–H of alkane, 1731–1184 cm−1
Silver-based SERS substrates fabricated using a 3D printed microfluidic device
Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65
- , TESCAN). A UV–vis spectrometer (Agilent 8453, Agilent, USA) and a micro-Raman spectrometer (NS200, Nanoscope System, Republic of Korea) were used to record the absorption spectra and Raman spectra, respectively. Fabrication of the droplet-based microfluidic device The fabrication process of the
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
- . Subsequently, AgNPs@Lac/Alg was characterized using various analytical techniques and applied for the catalytic degradation of contaminants and in bacterial activity assays. Absorption spectra were analyzed to monitor changes in physicochemical properties at the maximum peak region of surface plasmon resonance
- optimized at 90 °C and 140 min. As shown in Figure 2E and Figure 2F, the concentration of silver ions strongly influenced the formation of AgNPs. A clear absorption peak was not observed at a ratio of 0.1 (w/w), indicating no formation of AgNPs. However, the increase in silver ions resulted in an increase
- in the absorbance value in the UV–vis spectra. Minor changes in λmax values were noted from the absorption data, indicating a slight influence of the silver-ion-to-nanocomposite ratio on the physicochemical properties of the synthesized AgNPs. Considering these findings, two ratios of silver ions to
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