Antibacterial activity of a berberine nanoformulation

• Hue Thi Nguyen,
• Tuyet Nhung Pham,
• Anh-Tuan Le,
• Nguyen Thanh Thuy,
• Tran Quang Huy and
• Thuy Thi Thu Nguyen

Beilstein J. Nanotechnol. 2022, 13, 641–652, doi:10.3762/bjnano.13.56

• the preparation of berberine (BBR) in nanoformulation to enhance its solubility and increase its antibacterial effectiveness against hospital-acquired infections. BBR nanoparticles (BBR NPs) were formed by antisolvent precipitation (ASP) using glycerol as a safe organic solvent. UV–vis absorption

• of glycerol on the physicochemical properties of BBR NPs was investigated by UV–vis absorption and FTIR spectroscopy. The UV–vis absorption spectra of pure BBR and BBR NP solutions in distilled water at the same concentration are shown in Figure 1. Glycerol has no absorption band in the UV–vis

• properties of BBR NPs UV–vis absorption spectra of the aqueous solutions of pure BBR and BBR NPs having the same concentration were measured in the wavelength range of 200–550 nm using a UV–vis spectrophotometer (6850 UV/Vis, Jenway). The chemical bonding characteristics of pure BBR powder and BBR NPs

Detection and imaging of Hg(II) in vivo using glutathione-functionalized gold nanoparticles

• Gufeng Li,
• Shaoqing Li,
• Rui Wang,
• Min Yang,
• Lizhu Zhang,
• Yanli Zhang,
• Wenrong Yang and
• Hongbin Wang

Beilstein J. Nanotechnol. 2022, 13, 549–559, doi:10.3762/bjnano.13.46

• GSH-Rh6G2 was observed (Figure S3, Supporting Information File 1). GSH binds to GNPs via the thiol moiety, leading to an exposure of the amino group. Functional molecules can be directly bound via GSH, providing a stable environment based on the GNP nanostructure. The UV–vis absorption and

• were of analytical grade. TEM was carried out using a JEM-2100 transmission electron microscope (JEOL, Japan) at an accelerating voltage of 200 kV. UV–vis absorption spectra were obtained using a UV-2100 Spectrophotometer (Shimadzu, Japan). Fluorescence spectra were recorded using an F-7000

Zinc oxide nanostructures for fluorescence and Raman signal enhancement: a review

• Ioana Marica,
• Fran Nekvapil,
• Maria Ștefan,
• Cosmin Farcău and
• Alexandra Falamaș

Beilstein J. Nanotechnol. 2022, 13, 472–490, doi:10.3762/bjnano.13.40

Coordination-assembled myricetin nanoarchitectonics for sustainably scavenging free radicals

• Xiaoyan Ma,
• Haoning Gong,
• Kenji Ogino,
• Xuehai Yan and
• Ruirui Xing

Beilstein J. Nanotechnol. 2022, 13, 284–291, doi:10.3762/bjnano.13.23

• scavenging activity First, a solution of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical cations (ABTS+) solution was prepared. 7 mM of ABTS solution was mixed with 2.45 mM of potassium persulfate solution and kept for 12 h in the dark. The UV–vis absorption intensity of a 0.7 mM ABTS solution

• : MZG nanoparticles and Myr/GSH complex were dispersed in H2O for 5 days. Diluted ABTS solution was added with the same concentration of MZG and Myr/GSH complex (equivalent concentration of Myr and GSH: 4 μg·mL−1 and 8 μg·mL−1, respectively) every day. The UV–vis absorption intensity of ABTS at 734 nm

• quantitative stoichiometry analysis. The quantitative component analysis by UV–vis and ICP-OES proved that the molar ratio of Myr/GSH/Zn2+ was close to 1:1:1 (Supporting Information File 1, Table S1 and Figure S1). The UV–vis absorption spectra of pure Myr dispersed in 0.1 M NaOH (pH 13), Myr/Zn2+ complex (pH

Sputtering onto liquids: a critical review

• Anastasiya Sergievskaya,
• Adrien Chauvin and
• Stephanos Konstantinidis

Beilstein J. Nanotechnol. 2022, 13, 10–53, doi:10.3762/bjnano.13.2

High-yield synthesis of silver nanowires for transparent conducting PET films

• Gul Naz,
• Hafsa Asghar,
• Muhammad Ramzan,
• Muhammad Arshad,
• Rashid Ahmed,
• Muhammad Bilal Tahir,
• Bakhtiar Ul Haq,
• Nadeem Baig and
• Junaid Jalil

Beilstein J. Nanotechnol. 2021, 12, 624–632, doi:10.3762/bjnano.12.51

• structure and bend the film. The experimental results revealed that after ink coating, the substrate PET film retained its flexibility and transparency, as shown in Figure 2. Characterization UV–vis absorption spectra of liquid AgNW samples were recorded with a Cecil 7500 double-beam UV–vis

• circuit including a white LED was utilized. Results and Discussion To determine the morphology, the as-prepared silver nanostructures were first characterized by UV–vis absorption spectroscopy. The absorption spectrum of AgNWs is a function of the dielectric material, the chemicals used, and the particle

• flexibility and transparency. (a) UV–vis absorption spectra indicating the formation of AgNPs just after complete addition of AgNO3 (red line) and the end of the reaction with the formation of AgNWs (black line). The spectra after 10 min (green line) and 20 min (blue line) are also given. The insets showing

Surface-enhanced Raman scattering of water in aqueous dispersions of silver nanoparticles

• Paulina Filipczak,
• Krzysztof Hałagan,
• Jacek Ulański and
• Marcin Kozanecki

Beilstein J. Nanotechnol. 2021, 12, 497–506, doi:10.3762/bjnano.12.40

• , due to the presence of vibrational overtones and combinational modes in the UV–vis absorption spectrum of liquid water. Woutersen and Bakker [21] showed that fast intermolecular transfer of vibrational energy is present only in structured systems, such as the hydrogen bond network in liquid water

• phenomenon is present only in the AgNPs blue sample, not in the AgNPs yellow sample. Also, changes in the structure of AgNPs induced by laser irradiation may be excluded, as an identical UV–vis absorption spectra of the investigated AgNPs dispersions (see Figure S1 in Supporting Information File 1) collected

A review on nanostructured silver as a basic ingredient in medicine: physicochemical parameters and characterization

• Gabriel M. Misirli,
• Kishore Sridharan and
• Shirley M. P. Abrantes

Beilstein J. Nanotechnol. 2021, 12, 440–461, doi:10.3762/bjnano.12.36

• nanoparticles [63]. The UV–vis absorption spectrum is generally recorded between 210–1100 nm for AgNPs with various morphologies. By using the UV–vis absorption spectrum the physical and chemical properties of the nanoparticles can be correlated. The optical properties of the AgNPs tend to change when the

• absorption peak exhibits a change in intensity or position, which clearly indicates a variation. Experimentally, the stability of AgNPs was studied as depicted in Figure 12. The UV–vis absorption spectrum of the as-prepared sample was almost comparable to the spectrum obtained for a five-month-old AgNPs

• , due to the fact that the silver ion does not absorb in the visible region [55][63]. Zhang et al. carried out a systematic study of the production of spherical AgNPs with PVP and citrate. The reactions produced spherical AgNPs which exhibited an acute plasmon resonance peak at ≈400 nm in the UV–vis

Doxorubicin-loaded gold nanorods: a multifunctional chemo-photothermal nanoplatform for cancer management

• Uzma Azeem Awan,
• Abida Raza,
• Shaukat Ali,
• Rida Fatima Saeed and
• Nosheen Akhtar

Beilstein J. Nanotechnol. 2021, 12, 295–303, doi:10.3762/bjnano.12.24

• GNRs. (c) UV–vis absorption spectrum of bare GNRs, PSS-coated GNRs and DOX-loaded PSS-GNRs. (d) Zeta potential of CTAB-coated GNRs, PSS-GNRs and DOX-PSS-GNRs. PSS-GNRs before and after 808 nm laser exposure, the LSPR peak shifted about 4 nm. In vitro DOX release profile from PSS-GNRs. (a) NIR-triggered

Fusion of purple membranes triggered by immobilization on carbon nanomembranes

• René Riedel,
• Natalie Frese,
• Fang Yang,
• Martin Wortmann,
• Raphael Dalpke,
• Daniel Rhinow,
• Norbert Hampp and
• Armin Gölzhäuser

Beilstein J. Nanotechnol. 2021, 12, 93–101, doi:10.3762/bjnano.12.8

• fluorescence signal in I. indicates that the functionalization was successful. (c) XPS spectra of the NBPT SAM (green), NBPT CNM (blue), and NBPT CNM after the NTA functionalization (red). (d) IRRAS spectrum of NBPT CNM after the first functionalization step. (e) UV–vis absorption spectrum of a c-His PM

High-responsivity hybrid α-Ag₂S/Si photodetector prepared by pulsed laser ablation in liquid

• Raid A. Ismail,
• Hanan A. Rawdhan and
• Duha S. Ahmed

Beilstein J. Nanotechnol. 2020, 11, 1596–1607, doi:10.3762/bjnano.11.142

• observed at 125, 484 and 730 cm−1. Figure 5a shows the effect of adding CTAB on the UV–vis absorption spectrum of colloidal Ag2S NPs. The optical absorption was measured immediately after laser ablation. The addition of the cationic surfactant CTAB to the Tu solution led to a decrease in the optical

Cu₂O nanoparticles for the degradation of methyl parathion

• Juan Rizo,
• David Díaz,
• Benito Reyes-Trejo and
• M. Josefina Arellano-Jiménez

Beilstein J. Nanotechnol. 2020, 11, 1546–1555, doi:10.3762/bjnano.11.137

• through UV–vis absorption of 4-NPh. Likewise, it was shown that the surface basicity increases with decreasing nanoparticle size. The presence of CuCO3 on the surface of Cu2O, identified using X-ray photoelectron spectroscopy (XPS), passivates its surface and consequently diminishes the degradation of MP

• does not represent the concentration of NPs because they are made up of different amounts of Cu2O. When the reactions were over, the NPs were separated by centrifugation. This was done also before each UV–vis absorption and NMR measurement. Degradation of MP with bulk Cu2O was also tested, giving

Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)

• Domenik M. Zimmermann,
• Knud Seufert,
• Luka Ðorđević,
• Tobias Hoh,
• Sushobhan Joshi,
• Tomas Marangoni,
• Davide Bonifazi and
• Willi Auwärter

Beilstein J. Nanotechnol. 2020, 11, 1470–1483, doi:10.3762/bjnano.11.130

• between the values of the HOMO–LUMO gaps and the excitation energy obtained by STS and UV–vis absorption (see Figure 6) revealed that the optical gap seemed to be smaller than the electronic gap. This was expected due to the intrinsic differences in the measurement process of these gaps [85]. However

• highlight the individual molecules. The insets show the EHT-calculated MOs corresponding to the HOMO (a) and the LUMO (b and c) of the free molecule (compare to Figure 2). Optical characterization. a) and b) UV–vis absorption (solid line) and emission spectra (dotted line) of the trans-like (a, orange line

A few-layer graphene/chlorin e6 hybrid nanomaterial and its application in photodynamic therapy against Candida albicans

• Selene Acosta,
• Carlos Moreno-Aguilar,
• Dania Hernández-Sánchez,
• Beatriz Morales-Cruzado,
• Erick Sarmiento-Gomez,
• Carla Bittencourt,
• Luis Octavio Sánchez-Vargas and
• Mildred Quintana

Beilstein J. Nanotechnol. 2020, 11, 1054–1061, doi:10.3762/bjnano.11.90

• concentration of Ce6 in the FLG-Ce6 hybrid was calculated using UV–vis absorption spectroscopy. Ce6 presents an intense absorption band at 407 nm, corresponding to the Soret band. A Ce6 calibration curve at this wavelength is then produced. Then, in order to obtain a correct approximation of the real

• system characterization. a) UV–vis absorption spectra of pristine Ce6 (blue) and FLG-Ce6 (green). b) Singlet oxygen production assays. Singlet oxygen is indirectly observed through the fluorescence of the reporter molecule, singlet oxygen sensor green reagent; the higher fluorescence is related to higher

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

• Jinghan Xu,
• Yanqi Liu and
• Yan Zhao

Beilstein J. Nanotechnol. 2020, 11, 717–728, doi:10.3762/bjnano.11.59

• , d) AFT1 nanocolumn high-resolution TEM image, where the insets show the image processed by the software in the selected areas of the red-dotted line frames. XPS spectrum of AFT3: (a) Survey spectrum, and details of the regions related to (b) O 1s, (c) Ti 2p, (d) Ag 3d. (a,b) UV–vis absorption

• spectra and (c,d) bandgaps of the different samples. Photocatalytic activity for the degradation of MB: (a) UV–vis absorption spectra for the photocatalytic degradation of MB in the presence of AFT1 sample, (b) photocatalytic degradation rate of MB by different samples and pure MB under UV–vis light, (c

Soybean-derived blue photoluminescent carbon dots

• Shanshan Wang,
• Wei Sun,
• Dong-sheng Yang and
• Fuqian Yang

Beilstein J. Nanotechnol. 2020, 11, 606–619, doi:10.3762/bjnano.11.48

• absolute quantum yield (QY) was measured on a second fluorometer (Horiba Fluoromax-4) equipped with an integrating sphere. A quartz cubic cell with a 1 cm light path, which was filled with a suspension consisting of the prepared carbon nanoparticles, was used in UV–vis absorption measurements using a UV

• significant n–π* absorption from the annealed-CDs. Coupling the UV–vis absorption spectra with the PL spectra, we suggest that the observed PL originates from excited states produced by the n–π* excitation or from functionalized surface groups. The time-correlated single photon counting (TCSPC) lifetime

Evolution of Ag nanostructures created from thin films: UV–vis absorption and its theoretical predictions

• Robert Kozioł,
• Marcin Łapiński,
• Paweł Syty,
• Damian Koszelow,
• Wojciech Sadowski,
• Józef E. Sienkiewicz and
• Barbara Kościelska

Beilstein J. Nanotechnol. 2020, 11, 494–507, doi:10.3762/bjnano.11.40

• quality of the nanostructures, in terms of their use as plasmonic platforms, is reflected in the UV–vis absorption spectra. The absorption spectrum is dominated by a maximum in the range of 450–500 nm associated with the plasmon resonance. As the initial layer thickness increases, an additional peak

• : dewetting; finite-difference time-domain (FDTD) method; plasmon resonance; silver (Ag) nanostructures; thin films; UV–vis absorption; Introduction In the last decade there has been significant development in sensor-related research regarding the application in optical, medical or biological areas [1][2][3

• FDTD simulations are only capable to determine the absorption spectra. Results and Discussion Structure and UV–vis absorption The SEM results show that the formation of nanostructures from thin metallic layers is influenced by the initial layer thickness as well as the temperature and the time of

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

• Nicole Fillafer,
• Tobias Seewald,
• Lukas Schmidt-Mende and
• Sebastian Polarz

Beilstein J. Nanotechnol. 2020, 11, 466–479, doi:10.3762/bjnano.11.38

• conformational change and the associated symmetry breaking makes the transition S0→S1 more likely for the cis-isomer. By irradiating a solution of the ligands in an appropriate solvent at 313 nm (3.96 eV) the photoswitching can be observed via UV–vis absorption spectroscopy (see Figure 1). In the following, we

• presence of the azo compounds was verified using a combination of Fourier-transform infrared (FTIR) and UV–vis absorption spectroscopy. A characteristic vibration at 2991 cm−1, which can be associated to the N–H stretching vibrations of the ammonium headgroup (Figure 4E), vanishes completely for 3D-AzoC2

• successful functionalization. The UV–vis absorption spectra, shown in Figure 4F, confirm these findings. 3D-AzoC2 shows absorption maxima at 518 and 324 nm. The absorption at 518 nm is assigned to the excitonic bandgap of the perovskite. The absorption at 324 nm indicates the coordination of the azobenzene

Implementation of data-cube pump–probe KPFM on organic solar cells

• Benjamin Grévin,
• Olivier Bardagot and
• Renaud Demadrille

Beilstein J. Nanotechnol. 2020, 11, 323–337, doi:10.3762/bjnano.11.24

• UHV AFM chamber. The wavelength of 515 nm was selected since it falls within the UV–vis absorption bands of both PC71BM and PTB7. For each measurement, the optical power Popt corresponding to the maximum pulse intensity during the modulated illumination is indicated in the corresponding figure caption

Recent progress in perovskite solar cells: the perovskite layer

• Xianfeng Dai,
• Ke Xu and
• Fanan Wei

Beilstein J. Nanotechnol. 2020, 11, 51–60, doi:10.3762/bjnano.11.5

• C6H18N2O2PbI4 (EDBEPbI4) chains into 3D perovskites. The 2D/3D perovskites solved the discrepancy between PCE and stability. XRD patterns and UV–vis absorption spectra, retracing the formation of such heterojunctions, are shown in Figure 4b and Figure 4c. Doping with EDBEPbI4 gradually increases the grain size

• ][41][42][43][44][45][46][47][48][49][50][51]. Structural characterization and morphology. (a) Schematic illustration of the structure of the 2D/3D PSCs. (b) XRD patterns as a function of the 2D perovskite doping concentration and (c) UV–vis absorption spectra of the (EDBEPbI4)x(MAPbI3)1−x films. (d–g

Design and facile synthesis of defect-rich C-MoS₂/rGO nanosheets for enhanced lithium–sulfur battery performance

• Chengxiang Tian,
• Juwei Wu,
• Zheng Ma,
• Bo Li,
• Pengcheng Li,
• Xiaotao Zu and
• Xia Xiang

Beilstein J. Nanotechnol. 2019, 10, 2251–2260, doi:10.3762/bjnano.10.217

• (3 mL) as the adsorbents. Ultraviolet–visible (UV–vis) absorption spectra of these diluted solutions were collected using a Shimadzu UV 2550 spectrophotometer. Cell assembly and electrochemical measurements The working electrodes were prepared by casting a slurry of 80 wt % active materials (MoS2-S

• of pristine MoS2, and C-MoS2/rGO and C-MoS2/rGO-6 composites. (c) TG curves of MoS2-S, C-MoS2/rGO-S and C-MoS2/rGO-6-S composites; (d) UV–vis absorption spectra of the pure Li2S6 solution and Li2S6 solutions with pristine MoS2, and C-MoS2/rGO and C-MoS2/rGO-6 composites (inset: photos of the Li2S6

• composite renders the Li2S6 solution almost completely colorless while the solution of pristine MoS2 exhibits a stronger coloration than all solutions of C-MoS2/rGO composites. This could be attributed to the porous structure and high specific surface area of the C-MoS2/rGO-6 composite. The UV–vis

Nontoxic pyrite iron sulfide nanocrystals as second electron acceptor in PTB7:PC₇₁BM-based organic photovoltaic cells

• Olivia Amargós-Reyes,
• José-Luis Maldonado,
• Omar Martínez-Alvarez,
• María-Elena Nicho,
• José Santos-Cruz,
• Juan Nicasio-Collazo,
• Irving Caballero-Quintana and
• Concepción Arenas-Arrocena

Beilstein J. Nanotechnol. 2019, 10, 2238–2250, doi:10.3762/bjnano.10.216

• characteristics could facilitate exciton dissociation, charge transport and collection processes, and thus increase the overall PCE value. Figure 5a shows the UV–vis absorption spectra of the OPV active layer at different concentrations of FeS2 as well as that of the pure FeS2 film. The spectrum of the PTB7

• ITO (reference, black) and FeS2 NCs in TBAPF6 0.1 M at 100 mV s−1 (blue: anodic zone, red: cathodic zone). b) Flat energy diagram of the organic materials and FeS2 used for OPV fabrication [21]. a) UV–vis absorption and b) FTIR spectra of the blend PTB7:PC71BM at different FeS2 concentrations: 0.0

Pulsed laser synthesis of highly active Ag–Rh and Ag–Pt antenna–reactor-type plasmonic catalysts

• Kenneth A. Kane and
• Massimo F. Bertino

Beilstein J. Nanotechnol. 2019, 10, 1958–1963, doi:10.3762/bjnano.10.192

• of the reduction can be directly observed via UV–vis absorption spectroscopy. Ag–Rh/Pt heterostructures exhibited a significantly increased catalytic activity compared to the constituents. The observed increase is attributed to the heterostructures forming antenna–reactor-type plasmonic catalysts

• , eliminating any potential changes in catalytic activity due to alloying in the Ag–Pt and Ag–Rh bimetallic systems. UV–vis absorption spectroscopy measurements were made using an OceanOptics USB200 UV–vis spectrometer. Bright-field images of NPs were obtained with a Zeiss Libra transmission electron microscope

• were found to only adsorb to concavities. The 1:1 Ag–Pt system formed similar heterostructures. A series of HR-TEM images confirming the atomic makeup of the heterostructures is reported in Figure S3 (Supporting Information File 1). UV–vis absorption spectra of the monometallic and mixed colloids are

Charge-transfer interactions between fullerenes and a mesoporous tetrathiafulvalene-based metal–organic framework

• Manuel Souto,
• Joaquín Calbo,
• Samuel Mañas-Valero,
• Aron Walsh and
• Guillermo Mínguez Espallargas

Beilstein J. Nanotechnol. 2019, 10, 1883–1893, doi:10.3762/bjnano.10.183

• experimental UV–vis absorption spectrum of C60@MUV-2 is dominated by the MUV-2 framework (Figure 3b). Theoretical calculations predict several intense transitions in the region below 300 nm for the TTFTB ligand (Table S3, Supporting Information File 1) that explain the experimental wide band with maximum at

• ). Raman spectra were acquired with a micro-Raman (model XploRA ONE from Horiba, Kyoto, Japan) with a grating of 1200 gr/mm and a wavelength of 785 nm. UV–vis absorption spectra were recorded on a Jasco V-670 spectrophotometer in baseline mode from 400 to 800 nm range. The absorption spectra were measured

BiOCl/TiO₂/diatomite composites with enhanced visible-light photocatalytic activity for the degradation of rhodamine B

• Minlin Ao,
• Kun Liu,
• Xuekun Tang,
• Zishun Li,
• Qian Peng and
• Jing Huang

Beilstein J. Nanotechnol. 2019, 10, 1412–1422, doi:10.3762/bjnano.10.139

• ), and BTD prepared with different calcination temperatures (c and f). UV–vis absorption spectra (a) and band gap energy (b) of various samples. Mott–Schottky plots of BiOCl (a) and TiO2/diatomite (b). Photoluminescence spectra (a), transient photocurrent spectra (b) and electrochemical impedance spectra