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Search for "UV–vis absorption" in Full Text gives 148 result(s) in Beilstein Journal of Nanotechnology.
Effect of additives on the synthesis efficiency of nanoparticles by laser-induced reduction
Beilstein J. Nanotechnol. 2025, 16, 464–472, doi:10.3762/bjnano.16.35
- the change in the absorption peak at 520 nm in the UV–vis absorption spectrum caused by the localized surface plasmon resonance (LSPR) of the Au nanoparticles as a function of the laser irradiation time. The black line shows the change in absorbance for the solution without IPA, and the red line shows
- the nanoparticles, as determined from the change in absorbance at a wavelength of 520 nm in the UV–vis absorption spectrum of solutions with different concentrations of IPA during laser irradiation. The numbers in parentheses in the figure indicate the reaction finishing time of the nanoparticle
- by laser irradiation is low. We also investigated the effect of other additives other than IPA as radical scavengers. Figure 4 shows the change in absorbance at a wavelength of 520 nm in UV–vis absorption spectra of an Au solution with IPA, ethanol, and glycerin during laser irradiation. In all cases
Fabrication and evaluation of BerNPs regarding the growth and development of Streptococcus mutans
Beilstein J. Nanotechnol. 2025, 16, 308–315, doi:10.3762/bjnano.16.23
- . Powder BerNPs were obtained by the freeze-drying for 48 h at −55 °C under vacuum. Physicochemical characterization of BerNPs The specific adsorption peak of BerNPs was determined by UV–vis absorption spectroscopy in a wavelength range from 200 to 600 nm after dilution in methanol. The berberine
- recorded by observing the stained cells attached to the walls of the test tubes. FE-SEM images of (a) berberine and (b) BerNPs. (c) Histogram of particle size distribution of BerNPs. (a) UV–vis absorption spectrum of BerNPs. (b) Standard curve of pure berberine. (c) XRD patterns of pure berberine and
Radiosensitizing properties of dual-functionalized carbon nanostructures loaded with temozolomide
Beilstein J. Nanotechnol. 2025, 16, 229–251, doi:10.3762/bjnano.16.18
- ] in which physicochemical properties of non-covalently PEGylated CNs loaded with TMZ were characterized. Ultraviolet-visible absorption spectroscopy UV–vis absorption spectroscopy turned out to be a useful tool for characterizing functionalization with FA and for confirming the TMZ loading through the
Characterization of ZnO nanoparticles synthesized using probiotic Lactiplantibacillus plantarum GP258
Beilstein J. Nanotechnol. 2025, 16, 78–89, doi:10.3762/bjnano.16.8
- + cations. These findings offer information about the structure and chemical interactions within the ZnO NPs (Figure 2b). UV–vis absorption The UV–Vis absorption spectra of ZnO NPs, presented in Figure 2c, establish a distinct absorption peak at 3.16 eV, revealing the characteristic bandgap energy for ZnO
Facile synthesis of size-tunable L-carnosine-capped silver nanoparticles and their role in metal ion sensing and catalytic degradation of p-nitrophenol
Beilstein J. Nanotechnol. 2024, 15, 1576–1592, doi:10.3762/bjnano.15.124
- UV–vis absorption spectra of ʟ-car-AgNP2 without metal ions and with As3+ and Cr3+. The absorption curves reveal that As3+ and Cr3+ lead to hypsochromic (530 nm) and hyperchromic (400 nm) shifts, respectively, of the plasmon peak. The interaction between negatively charged ʟ-car-AgNP2 and positively
Green synthesis of carbon dot structures from Rheum Ribes and Schottky diode fabrication
Beilstein J. Nanotechnol. 2024, 15, 1369–1375, doi:10.3762/bjnano.15.110
- the structure of the coated CDs film (Figure 5); the CDs film thickness was determined as ca. 566 nm. In addition, a UV–vis absorption spectrum of the CDs layer was taken (Figure 6a), and the bandgap value of the layer was determined from the graph of hν versus (αhν)2 using the Tauc equation [23]. The
- new synthesized CDs were determined, and their structural and optical characterization was performed. The usability of the new CDs in diode fabrication as an application area was discussed. The layer thickness and bandgap energy for the prepared CDs film from SEM and UV–vis absorption measurements
- the Schottky diode based on CDs. (a) TEM image, (b) size distribution, (c) XRD pattern, (d) FTIR spectrum, (e) XPS spectrum, and (f) Raman spectrum of the CDs. UV–vis absorption and fluorescence spectra of the CDs (λexc = 320 nm). (a) Fluorescence and (b) normalized fluorescence spectra of the CDs at
Enhanced catalytic reduction through in situ synthesized gold nanoparticles embedded in glucosamine/alginate nanocomposites
Beilstein J. Nanotechnol. 2024, 15, 1227–1237, doi:10.3762/bjnano.15.99
- effectiveness of this reaction hinges on the catalytic surface, influenced by both reagent adsorption and product desorption. We monitored the in situ reduction of organic dyes using the nanocatalyst via time-dependent UV–vis absorption measurements at ambient temperature. Confirmation of reduction was
Green synthesis of biomass-derived carbon quantum dots for photocatalytic degradation of methylene blue
Beilstein J. Nanotechnol. 2024, 15, 755–766, doi:10.3762/bjnano.15.63
- optoelectronic characteristics of the synthesized CQDs, UV–vis absorption spectra were measured using a Thermo Scientific Evolution 220 spectrophotometer. The CQDs were dissolved in deionized water at a ratio of 1:10 (0.3 mg of CQDs per mL) and the measurements were taken in the range of 200–800 nm. A 1 cm path
- value of the reaction mixture was kept constant during the test (pH 7). To initiate the catalytic process, each CQD sample was individually applied to the degradation of the MB dye. The UV–vis absorption spectrum of the dye was monitored using a spectrophotometer (Thermo Scientific Evolution model 220
Simultaneous electrochemical determination of uric acid and hypoxanthine at a TiO2/graphene quantum dot-modified electrode
Beilstein J. Nanotechnol. 2024, 15, 719–732, doi:10.3762/bjnano.15.60
- microscope (SEM), Hitachi (Japan). UV–vis absorption spectroscopy measurements was carried out on an 8453 UV–vis spectrophotometer, Agilent, USA. Photoluminescence (PL) spectroscopy measurements were performed on a FL3C-22 spectrophotometer, Horiba, USA. Synthesis of TiO2/GQDs Peroxo titanium complexes were
Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots
Beilstein J. Nanotechnol. 2024, 15, 475–489, doi:10.3762/bjnano.15.43
- electrons and holes. These results suggest that the CoFe2O4/GQD nanocomposite is a potential catalyst for methylene blue degradation and various environmental applications. XRD patterns of (a) CF and (b) CF/GQDs. (a) UV–vis absorption spectra of the GQD solution; inset: GQD solution under white light (left
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
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
- . The energy-dispersive X-ray spectroscopy (EDS) results in Figure 1c show Zn, Cu, and O, which indicates the presence of ZnO and CuO. No further impurities were found. The results from X-ray diffractometry (XRD) and UV–vis absorption spectroscopy confirm that the nanoparticles covering the surfaces and
- JCPDS card No. 01-080-0076. This is proof of the existence of CuO NPs in the CuO NPs/ZnO NRs structure. Figure 2b shows the UV–vis absorption spectra of the pure ZnO NRs and ZnO NRs decorated with CuO NPs. Both samples containing ZnO NRs have absorption edges in a wavelength range from 300 to 380 nm due
- composition of the materials. The morphology of pure CuO NPs and CuO NPs/ZnO NRs was examined by field-emission scanning electron microscopy. UV–vis absorption spectroscopy showed the optical properties of the materials. The photodetector performance was studied through the current–voltage (I–V
Isolation of cubic Si3P4 in the form of nanocrystals
Beilstein J. Nanotechnol. 2023, 14, 971–979, doi:10.3762/bjnano.14.80
- 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
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- , P2, S1, and S2, respectively. UV–vis absorption spectra of the solid samples were recorded in reflectance mode employing a Jasco V-670 spectrometer. Thermogravimetric analysis (TGA) was carried out on a Netzsch TG 209 F1 Libra instrument in the 30–900 °C temperature range. Magnetic data were
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
- toxic dyes, methyl orange (MO) and rhodamine B (RhB), using various doses of the nanocomposite. The degradation of toxic dyes using a nanocomposite catalyst was monitored in situ by measuring UV–vis absorption at ambient temperature, with the concentration changing in a time-dependent manner. The
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
- , differential pulse voltammetry experiments were conducted with 0.1 M phosphate-buffered saline at pH 7. Results and Discussion Characterization of graphene quantum dots The UV–vis absorption spectrum of the GQDs in distilled water is depicted in Figure 2a, which shows two prominent absorption peaks around 270
- -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
Mixed oxides with corundum-type structure obtained from recycling can seals as paint pigments: color stability
Beilstein J. Nanotechnol. 2023, 14, 467–477, doi:10.3762/bjnano.14.37
- characteristic Fe3+ satellites at higher binding energies (shifted by ca. 9 eV from Fe 2p3/2) [27], similar to that reported in [28]. Electronic spectroscopy In the UV–vis absorption spectrum of sample 1 (Figure 5a), the prominent band with a maximum centered at 588 nm can be attributed to the 4A2→4T2 transition
- sample 2. The spectra confirm the oxidation state 3+ in all samples (Al3+, Cr3+, and Fe3+). UV–vis absorption spectra of (a) sample 1 and (b) sample 2, both confirming the oxidation state 3+ of the coloring ions. Distribution of samples according to the hue value (h*): alumina (87.20), sample 1 (80.65
Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities
Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31
- was calculated from the obtained results. Results and Discussion The characterization of the synthesized silver nanoparticles (Ag NPs) was carried out by using UV–vis absorption spectroscopy at ambient temperature. Figure 2 shows the UV–vis absorption measurement results of different Ag NPs, which are
- insight into the aggregation and the stability of the Ch/Q- and Ch/CA-Ag NPs in the cell culture medium, UV–vis absorption measurements were carried out (see Supporting Information File 1, Figure S2). As can be seen in Figure S2 (Supporting Information File 1), the SPR peak emerges at 428 and 440 nm for
- curve for both Ag NPs in the medium. The redshift in the SPR peak wavelength and the broadening in the absorption curve towards the lower-energy region of the spectrum in the cell culture medium can be an indication of the formation of the aggregated structures [75]. UV–vis absorption measurements were
Non-stoichiometric magnetite as catalyst for the photocatalytic degradation of phenol and 2,6-dibromo-4-methylphenol – a new approach in water treatment
Beilstein J. Nanotechnol. 2022, 13, 1531–1540, doi:10.3762/bjnano.13.126
- multimeter (CPC 411, Elmetron, Poland). External standards of seven concentration levels ranging from 1 × 10−5 to 1 × 10−3 mol·L−1 were used to quantify bromide ions. X-ray diffraction measurements of M1 (red), M2 (blue) (a), and UV–vis absorption spectra of M1 (red) and M2 (blue) (b). Figure 1a and 1b were
In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles
Beilstein J. Nanotechnol. 2022, 13, 1505–1519, doi:10.3762/bjnano.13.124
- give rise to a collective oscillation known as surface plasmon effect [34]. This effect can be monitored by UV–vis spectroscopy, where metal nanoparticles absorb radiation at different wavelengths depending on their size [36]. The UV–vis absorption spectra of the reactions at different temperatures are
Facile preparation of Au- and BODIPY-grafted lipid nanoparticles for synergized photothermal therapy
Beilstein J. Nanotechnol. 2022, 13, 1432–1444, doi:10.3762/bjnano.13.118
- –visible (UV–vis) absorption spectra were measured with an UV–vis spectrometer (Q-5000, Quawell, America). The amounts of BDP in AB-LNPs were analyzed using UV–vis spectroscopy after the dissolution of AB-LNPs in DMSO by measuring the absorbance at a wavelength of 600 nm. The loading efficiency (LE, %) was
Near-infrared photoactive Ag-Zn-Ga-S-Se quantum dots for high-performance quantum dot-sensitized solar cells
Beilstein J. Nanotechnol. 2022, 13, 1337–1344, doi:10.3762/bjnano.13.110
- prove the incorporation of AZGSSe QDs in the TiO2 NFs. The UV–vis absorption spectrum of the AZGSSe/TiO2-based photoanode in comparison with TiO2 NFs shown in Figure 6a. It can be observed that AZGSSe/TiO2-based photoanode has a light absorption in the NIR region. This signifies that AZGSSe/TiO2 is an
Design of surface nanostructures for chirality sensing based on quartz crystal microbalance
Beilstein J. Nanotechnol. 2022, 13, 1201–1219, doi:10.3762/bjnano.13.100
- resonance [10], Fourier transform infrared spectrometry (FTIR) [11], UV–vis absorption spectrometry [12], mass spectrometry (MS) [13], titration microcalorimetry [14], high-performance liquid chromatography (HPLC) [15], gas chromatography (GC), capillary electrophoresis (CE) [16], and electrochemical chiral
Solar-light-driven LaFexNi1−xO3 perovskite oxides for photocatalytic Fenton-like reaction to degrade organic pollutants
Beilstein J. Nanotechnol. 2022, 13, 882–895, doi:10.3762/bjnano.13.79
- . The UV–vis absorption capability with diffuse reflectance spectroscopy (DRS) and photographs of various LaFexNi1−xO3 perovskite oxides with different proportions were shown in Figure 5a and 5b. Except for LaFeO3, which was brown, the rest of the perovskite oxides doped with Ni became black. Since
- microscopy (FESEM). The light absorption spectra of the perovskite oxides were inspected using V-670 (Jasco, Japan) to examine the UV–vis absorption capability with diffuse reflectance spectroscopy (DRS) from 200 to 800 nm. The nitrogen adsorption–desorption analyzer, ASAP 2020 PLUS (ASAP, USA), was applied
A nonenzymatic reduced graphene oxide-based nanosensor for parathion
Beilstein J. Nanotechnol. 2022, 13, 730–744, doi:10.3762/bjnano.13.65
- PT was tested five times, and the average value was represented with standard deviation. The results also validate the standard spectrophotometric analysis. Quantification of parathion using spectrophotometry The ultraviolet–visible (UV–vis) absorption spectroscopic study was performed to validate
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