Search results
Search for "UV–vis spectroscopy" in Full Text gives 144 result(s) in Beilstein Journal of Nanotechnology.
Graphene oxide–chloroquine conjugate induces DNA damage in A549 lung cancer cells through autophagy modulation
Beilstein J. Nanotechnol. 2025, 16, 316–332, doi:10.3762/bjnano.16.24
- formation of GO–Chl nanoconjugates was confirmed by investigating the optical, functional, structural, and morphological properties employing standard analytical characterization techniques. The optical properties of GO and GO–Chl were assessed using UV–vis spectroscopy (Supporting Information File 1
- two ways viz. entrapment efficacy (EE, % Chl that has been successfully absorbed onto GO) and % drug content or drug loading efficiency (DLE, amount of Chl loaded per unit weight of GO) using UV–vis spectroscopy. Firstly, a standard calibration curve of Chl was plotted by monitoring the optical
- ), and deconvoluted fitting components (multicolored regions) are also shown here. Quantitative estimation of Chl binding onto GO nanosheets using UV–vis spectroscopy: (a) Optical density measurement of various concentrations (2.5–25 µg/mL) of Chl for the preparation of a standard calibration curve. (b
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
- prepared using a wet-milling method with zirconium balls to enhance bioavailability and expand potential applications. The particle size and physicochemical properties of the BerNPs were analyzed using field-emission scanning electron microscopy (FE-SEM), UV–vis spectroscopy, X-ray diffraction, and Fourier
Preferential enrichment and extraction of laser-synthesized nanoparticles in organic phases
Beilstein J. Nanotechnol. 2025, 16, 254–263, doi:10.3762/bjnano.16.20
- and the vessel was held in place for two hours. Colloids were characterized by UV–vis-spectroscopy using a Cary 50 spectrometer (Varian Inc.) and further processed by OriginPro. The raw UV–vis extinction spectra were baseline-corrected by subtraction of UV–vis extinction spectra gained from
- nanoparticle-free TMS (Supporting Information File 1, Figure S4c) from the UV–vis extinction spectra of the gained colloids in the respective TMS (Supporting Information File 1, Figure S4a,b). Fractions of the colloids in the respective phases were calculated by dividing the extinctions obtained from UV–vis
- -spectroscopy (Supporting Information File 1, Figure S1 and Figure S5) at the wavelength of the plasmon resonance peak (for Au and Ag) or at the wavelength of 550 nm (for Cu, Fe, Al, and Ti). The extinction at a wavelength of 550 nm for copper was used because the plasmon resonance peaks were not always
Radiosensitizing properties of dual-functionalized carbon nanostructures loaded with temozolomide
Beilstein J. Nanotechnol. 2025, 16, 229–251, doi:10.3762/bjnano.16.18
- after exposure to irradiation, X-ray powder diffraction (XRPD) was used. The stability of TMZ under these conditions was determined unsing attenuated total reflectance Fourier-transform infrared (ATR-FTIR) and UV–vis spectroscopy. Most of the procedures and techniques were used in our previous study [43
Clays enhanced with niobium: potential in wastewater treatment and reuse as pigment with antibacterial activity
Beilstein J. Nanotechnol. 2025, 16, 141–154, doi:10.3762/bjnano.16.13
- characterized through colorimetric analysis (CIEL*a*b*) and UV–vis spectroscopy. Antimicrobial activity test The antimicrobial properties of the BEPh, BEOx, A-BEPh, A-BEOx, A-BEPhP, and A-BEOxP samples were investigated against the bacteria Bacillus cereus (ATCC 10876) (Gram-positive) and Proteus mirabilis
Characterization of ZnO nanoparticles synthesized using probiotic Lactiplantibacillus plantarum GP258
Beilstein J. Nanotechnol. 2025, 16, 78–89, doi:10.3762/bjnano.16.8
- characterization using UV–vis spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction measurements, energy-dispersive X-ray spectroscopy, scanning and transmission electron microscopy, photocatalytic studies, electrochemical analysis, and determination of antibacterial and anticancer activity. The
- pattern) and 192 nm (irregular shape). Valuable insights regarding photocatalytic and colloidal stability of the biosynthesized ZnO NPs was provided by using UV–vis spectroscopy and zeta potential analysis. Compared to a similar type of study conducted by Selvarajan and Mohanasrinivasan [24], our study
- °–80° (2θ), with a step size of 0.02° and a dwell time of 1 s per step. Reflectance was studied using UV–vis spectroscopy performed on a Shimadzu UV-2600 double-beam spectrophotometer. Nanoparticles were dispersed in deionized water at a concentration of 1 mg/mL, and the spectra were recorded in the
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
- -AP was monitored through UV–vis spectroscopy. In UV–vis measurements, there was a decrease in absorption intensity at 400 nm, and a minor peak around 300 nm was observed due to the formation of P-AP (Figure 9). Figure 9 illustrates the P-NP degradation at 0.25 mM using ʟ-car-AgNPs (1 ± 0.2 OD). ʟ-car
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
- electron microscopy (SEM), I–V/C–V measurements, UV–vis spectroscopy, and steady-state fluorescence spectroscopy, respectively. CDs synthesis 2.5 g of the powdered Rheum ribes plant was placed in an autoclave bottle, and 50 mL of pure water was added to the bottle. This aqueous solution was placed in an
Mn-doped ZnO nanopowders prepared by sol–gel and microwave-assisted sol–gel methods and their photocatalytic properties
Beilstein J. Nanotechnol. 2024, 15, 1283–1296, doi:10.3762/bjnano.15.104
- parallel in Figure 7. The insets show a wide pore size distribution reaching 120 nm and pore width maxima located in the mesoporosity area for both samples (40 nm for SG and 35–45 nm for MW). Similar textural features for SG and MW samples are presented in Table 3. UV–vis spectroscopy The recorded UV–vis
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
- g·mL−1). The reduction process was initiated through heating the mixture and visually confirmed by a change in color of the reaction mixture indicating the formation of AuNPs on the GluN/Alg composite. UV–vis spectroscopy within the range of 300 to 600 nm was employed to monitor this process
- temperature, and the reaction time, by using UV–vis spectroscopy. Changes in the physicochemical properties, such as morphology and particle size of AuNPs, were monitored through absorbance and the λmax values of the surface plasmon resonance (SPR) band. Figure 2 illustrates the impact of synthesis conditions
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
- incandescent light were used, and the solution was continuously agitated. The absorbance of the solution was measured at 20 min intervals to monitor the progress of the degradation reaction. All samples were evaluated under both light sources. Results and Discussion UV–vis spectroscopy UV–vis spectroscopy was
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
- time intervals, 10 mL of the sample was taken and centrifuged to separate the material from the solution. The concentration of remaining MB in the solution was determined by using UV–vis spectroscopy. Identification of intermediates Intermediate products and mineralization level of the MB
- result, the repulsion force of these species comes into play, reducing adsorption. UV–vis spectroscopy was used to study MB decolourisation (Figure 7c). The UV–vis spectra of MB present a strong adsorption band at 664 nm, corresponding to functional groups (n–π* electron transition), and two adsorption
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
- nanoparticles, including the size of the shell (0.6 nm), and the core size declared by the manufacturer are included in Table 1. UV–vis spectroscopy was conducted with an Avantes Sensline Ava-Spec ULS-RS-TEC fiber-optic spectrophotometer and an Avantes AvaLight DH-S-BAL-Hal lamp. The absorption and luminescence
- determined in a wide frequency range from 10−1 to 106 Hz at room temperature. The amplitude of the alternating current signal was set to 0.1 V. The ZView software was used to analyze the recorded impedance spectra. Results and Discussion UV–vis spectroscopy The pure quantum dots exhibit absorption in the
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
- on Raphanus sativus (R. sativus) concerning its tolerance levels, toxicity, and accumulation. ZnO NPs were synthesized by the wet chemical method and characterized by powder X-ray diffraction (PXRD), Fourier-transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–vis) spectroscopy, dynamic
- synthesized ZnO NPs were characterized via several techniques such as powder X-ray diffraction (PXRD), Fourier-transform infrared (FTIR) spectroscopy, solid-UV–vis spectroscopy, dynamic light scattering (DLS), and scanning electron microscopy (SEM). Then the potential phytotoxicity of the synthesized ZnO NPs
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
- was measured using UV–vis spectroscopy at a wavelength of 600 nm (OD600). The gold standard method of plate counting was used to estimate the number of bacterial cells. Detection of E. coli for bacterial assays Following the optimization of the experimental settings, various concentrations of E. coli
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- ][49]. The XPS spectra of the samples x20V and x25M are indistinguishable from that of reference x1, suggesting the lack of CoIII in the impurity of sample x25M. Supporting Information File 1, Table S2 compiles further information related to the XPS signals. Finally, UV–vis spectroscopy has
- Co atoms are in the same oxidation state (2+), they would be found in different environments, as suggested by PXRD and confirmed by UV–vis spectroscopy. This means the presence of the α-CoII LH impurity. To quantify its fraction, the spectrum of sample x25M was reproduced by using a linear
SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms
Beilstein J. Nanotechnol. 2023, 14, 552–564, doi:10.3762/bjnano.14.46
- substrates were examined regarding their optical properties using UV–vis spectroscopy and regarding their morphology using scanning electron microscopy. SERS properties of the fabricated GaN/Ag substrates were evaluated by measuring SERS spectra of 4-mercaptobenzoic acid molecules adsorbed on them. For all
- morphology of fabricated Ag layers examined by scanning electron microscopy (SEM). Then, we present the results of their optical properties determined using UV–vis spectroscopy. Finally, we compare the SERS performance of the GaN/Ag substrates toward 4-mercaptobenzoic acid (pMBA) molecules adsorbed on them
- morphology of the GaN/Ag substrates, especially at temperatures of 100 °C and above. Instead of spiky Ag nanostructures, nanostructures with irregular, but more rounded, shapes are obtained. The optical properties of the GaN/Ag substrates, determined by UV–vis spectroscopy, are affected by their morphology
On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets
Beilstein J. Nanotechnol. 2023, 14, 509–521, doi:10.3762/bjnano.14.42
- . The concentration of the resulting dispersion was measured using UV–vis spectroscopy, as described above. The dispersion was then added to the GNPref sample to produce 13 mixed GNP/sediment samples with sediment concentrations of 0.5, 1, 2, 5, 10, 25, 35, 50, 65, 75, and 90 wt %. Each mixed dispersion
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
- characterization of quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles (Ch/Q- and Ch/CA-Ag NPs), and their antibacterial and anticancer activities. The formation of Ch/Q- and Ch/CA-Ag NPs has been confirmed by ultraviolet–visible (UV–vis) spectroscopy, Fourier-transform
Biocatalytic synthesis and ordered self-assembly of silica nanoparticles via a silica-binding peptide
Beilstein J. Nanotechnol. 2023, 14, 280–290, doi:10.3762/bjnano.14.25
- combination with NH3. The reaction kinetics were monitored via measuring the optical density (OD) with UV–vis spectroscopy and the conversion of substrate via gas chromatography coupled with mass spectroscopy (GC–MS). Size and net surface charge distribution of the particles were determined with dynamic light
- scattering (DLS). The efficiency of the self-assembly was evaluated with scanning electron microscopy (SEM), UV–vis spectroscopy, and qualitative visual demonstration. Results and Discussion SiBP alone as catalyst Reaction kinetics were studied via OD measurements of the particles and GC analysis of
- -assembly of the particles The effect of the SiBP on the self-assembly of the as-grown particles was investigated via SEM and UV–vis spectroscopy. Single-layer and multilayer assemblies were investigated by using different dilutions of the as-synthesized particles. SEM imaging showed that the particles from
Antimicrobial and mechanical properties of functionalized textile by nanoarchitectured photoinduced Ag@polymer coating
Beilstein J. Nanotechnol. 2023, 14, 95–109, doi:10.3762/bjnano.14.11
- micrometer. Figure 1 shows images of the as-synthesized samples with and without AgNPs for the PEG600DA polymer and PEG600DA/PETIA copolymer matrixes coated onto cotton fabric. Optical and morphological properties UV–vis spectroscopy was initially carried out on glass-coated Ag@PEG600DA or Ag@PEG600DA/PETIA
- corresponding growth inhibition zone. Results are expressed as mean inhibition area ± standard deviation (SD). The mean area of the samples was 112 ± 7 mm2. Cotton textile coated with Ag@PEG600DA (a), Ag@PEG600DA/PETIA (1:1) (b) and inserted images of PEG600DA and PEG600DA/PETIA polymers without AgNPs. UV–vis
- spectroscopy monitoring of 100 µm-thick Ag@PEG600DA (a) and Ag@PEG600DA/PETIA (b) coatings, with images taken after increasing exposure times. Reflectance measurements and corresponding images of Ag@polymer (PEG600DA and PEG600DA/PETIA) functionalized textiles. SEM of the 100 µm-thick Ag@PEG600DA (a) and Ag
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
- before drying to be characterized by UV–vis spectroscopy. Characterization X-ray diffraction patterns were obtained in a Bruker AXS D8 Advance diffractometer, at 30 mA and 40 kV, with a Ni filter and a Cu Kα radiation generator. Diffraction patterns were acquired at a scan rate of 1 °/min from 10 to 90
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
- taken out to measure the amount of the released drug by UV–vis spectroscopy, and an equal volume of fresh release medium was added to keep the volume constant. Photothermal measurement for AB-LNPs To study the photothermal properties of AB-LNPs, different concentrations of AB-LNPs with BDP
- characteristics could reduce the systemic toxicity of AB-LNPs on normal tissues. To check whether free BDP is stable during the release experiment, the content of BDP in PBS (pH 7.4 or 5.4) was measured using UV–vis spectroscopy. The content of free BDP showed little change over a period of 36 h (Figure 3d
Supramolecular assembly of pentamidine and polymeric cyclodextrin bimetallic core–shell nanoarchitectures
Beilstein J. Nanotechnol. 2022, 13, 1361–1369, doi:10.3762/bjnano.13.112
- reported for the isethionate group [27]. Thus, in our experiments the use of Pent as a free base allowed us to verify its inclusion into the CD cavity excluding the unsought interactions of the isethionate group with the CD polymer and/or metal NPs. The nanoGSP complex was characterized by UV–vis
- spectroscopy, DLS, and ζ potential measurements. The UV–vis spectra clearly indicated strong interactions between nanoGS and Pent (Figure 4B). Specifically, we can observe: i) the red shift in the LSPR band from 402 nm (nanoGS) to 409 nm (nanoGSP); (ii) the presence of the Pent band centred at 262 nm in
Green synthesis of zinc oxide nanoparticles toward highly efficient photocatalysis and antibacterial application
Beilstein J. Nanotechnol. 2022, 13, 1108–1119, doi:10.3762/bjnano.13.94
- centrifuged at 6000 rpm to measure the dye concentrations. The dye concentration was analyzed by UV–vis spectroscopy (Hitachi U2900) with maximum adsorption wavelengths of MB and MO of 664 nm and 464 nm, respectively [29][30]. The degradation efficiency was calculated using Equation 3. where c0 is the initial
Other Beilstein-Institut Open Science Activities
