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Search for "UV–vis spectroscopy" in Full Text gives 144 result(s) in Beilstein Journal of Nanotechnology.

Reliable fabrication of transparent conducting films by cascade centrifugation and Langmuir–Blodgett deposition of electrochemically exfoliated graphene

  • Teodora Vićentić,
  • Stevan Andrić,
  • Vladimir Rajić and
  • Marko Spasenović

Beilstein J. Nanotechnol. 2022, 13, 666–674, doi:10.3762/bjnano.13.58

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  • graphene was varied. As the film of graphene formed on the surface of the water, the LB method was used to deposit the film onto the target substrate [32]. Film characterization To study optical properties of the fabricated samples, UVvis spectroscopy was performed (Thermo Fisher Scientific EVO 60
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Published 18 Jul 2022

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

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  • after centrifuging and washing with water and, subsequently, dissolved in 0.1 M NaOH solution. The concentrations of Myr and GSH were determined by UVvis spectroscopy. The concentration of Zn2+ was measured by inductively coupled plasma optical emission spectroscopy (ICP-OES). Evaluation of ROS
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Published 01 Mar 2022

Impact of device design on the electronic and optoelectronic properties of integrated Ru-terpyridine complexes

  • Max Mennicken,
  • Sophia Katharina Peter,
  • Corinna Kaulen,
  • Ulrich Simon and
  • Silvia Karthäuser

Beilstein J. Nanotechnol. 2022, 13, 219–229, doi:10.3762/bjnano.13.16

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  • precursor [Ru(acetone)6](PF6)3 (Ru-PF6) were prepared according to procedures previously described [15][19][25][26][27]. The analysis of the prepared substances, including 1H NMR, UVvis spectroscopy and mass spectrosmetry, display a high purity [15]. The molecular formulas of the chemical compounds are
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Published 15 Feb 2022

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

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  • nuclei of the final NPs [94][95]. Because silver clusters absorb light at different wavelengths than the surface plasmon resonance (SPR) band of Ag NPs (which is used for monitoring of NP growth kinetics by UVvis spectroscopy) one can spot the induction period on the sigmoidal kinetic curves. Noteworthy
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Published 04 Jan 2022

Biocompatibility and cytotoxicity in vitro of surface-functionalized drug-loaded spinel ferrite nanoparticles

  • Sadaf Mushtaq,
  • Khuram Shahzad,
  • Tariq Saeed,
  • Anwar Ul-Hamid,
  • Bilal Haider Abbasi,
  • Nafees Ahmad,
  • Waqas Khalid,
  • Muhammad Atif,
  • Zulqurnain Ali and
  • Rashda Abbasi

Beilstein J. Nanotechnol. 2021, 12, 1339–1364, doi:10.3762/bjnano.12.99

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  • ZS (Malvern Instruments, 69 UK) and the uniform size distribution by gel electrophoresis (GE BIORAD). Drug attachment and drug release analyses were performed by using UVvis spectroscopy (Thermo Scientific Evo 220). Phase transfer, polymer coating, and purification of MFe2O4 (M = Fe, Co, Ni, Zn) NPs
  • were incubated with optimized concentrations of EDC and drug (DOX and MTX) for 2 h at room temperature. The drug attachment to the surface of NP was confirmed by UVvis spectroscopy [30]. The drugs unbound from the samples were removed by 50 KDa centrifugal filters and their concentration in the waste
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Published 02 Dec 2021

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

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  • alignment on a large scale and were characterized by UVvis spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and PL spectroscopy. The luminescent AgNWs exhibited red emission, which was accredited to deep holes. The SEM results confirmed the formation of AgNWs of 3.3 to 4.7 µm in
  • AgNWs were then used for various characterizations. The prepared solution was further diluted and used for UVvis spectroscopy and PL spectroscopy. Another batch of the same reaction solution was dried and crushed into fine powder used for SEM imaging. This modified synthesis method is shown
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Published 01 Jul 2021

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

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  • , UVvis spectroscopy, inductively coupled plasma optical emission spectrometry (ICP-OES), dynamic light scattering (DLS), among other techniques [33]. The basic principles of the techniques mentioned here are detailed in the following sections. Each AgNPs is unique, depending on its size, state of
  • scattering spectra by UV–vis (extinction spectrum = absorption + scattering) for AgNPs in water, calculated by using the Mie scattering theory [63]. UVvis spectroscopy is a simple and safe method to monitor the stability of AgNPs. When particles aggregate, dissociate, or change shape, the original
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Published 14 May 2021

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

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  • analyzed by UVvis spectroscopy. In vitro drug release by NIR exposure NIR-triggered drug release from PSS-GNRs was measured in 10 mM phosphate-buffered saline (PBS, pH 5.6 at 37 °C). A continuous-wave 808 nm NIR laser (Ti-Sapphire, Spectra Physics CA 95054, USA) was used. DOX-PSS-GNRs (40 µg/mL, 2 mL
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Published 31 Mar 2021

Characterization, bio-uptake and toxicity of polymer-coated silver nanoparticles and their interaction with human peripheral blood mononuclear cells

  • Sahar Pourhoseini,
  • Reilly T. Enos,
  • Angela E. Murphy,
  • Bo Cai and
  • Jamie R. Lead

Beilstein J. Nanotechnol. 2021, 12, 282–294, doi:10.3762/bjnano.12.23

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  • pristine AgNPs, including dynamic light scattering (DLS), UVvis spectroscopy (UV–vis), transmission electron microscopy (TEM), and inductively coupled plasma mass spectrometry (ICP-MS). DLS gave a Z-average hydrodynamic size of 33.7 ± 0.7 nm (mean ± standard deviation) and a PDI (polydispersity index) of
  • of NPs are related to Ostwald ripening of NPs [36], as evidenced in our STEM results. The subsequent reduction in size is explained as further transformations that are dominated by dissolution [36]. UVvis spectroscopy data suggest some aggregation and possible shape changes after reprecipitation at
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Published 24 Mar 2021

A review on the green and sustainable synthesis of silver nanoparticles and one-dimensional silver nanostructures

  • Sina Kaabipour and
  • Shohreh Hemmati

Beilstein J. Nanotechnol. 2021, 12, 102–136, doi:10.3762/bjnano.12.9

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Published 25 Jan 2021

ZnO and MXenes as electrode materials for supercapacitor devices

  • Ameen Uddin Ammar,
  • Ipek Deniz Yildirim,
  • Feray Bakan and
  • Emre Erdem

Beilstein J. Nanotechnol. 2021, 12, 49–57, doi:10.3762/bjnano.12.4

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  • , one may at least separate the surface and core defects safely. There are other useful characterization techniques, such as UVvis spectroscopy, with which one may correlate the size effects and defect concentrations with the change in Eg. This is sometimes called bandgap engineering or tuning of the
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Published 13 Jan 2021

Unravelling the interfacial interaction in mesoporous SiO2@nickel phyllosilicate/TiO2 core–shell nanostructures for photocatalytic activity

  • Bridget K. Mutuma,
  • Xiluva Mathebula,
  • Isaac Nongwe,
  • Bonakele P. Mtolo,
  • Boitumelo J. Matsoso,
  • Rudolph Erasmus,
  • Zikhona Tetana and
  • Neil J. Coville

Beilstein J. Nanotechnol. 2020, 11, 1834–1846, doi:10.3762/bjnano.11.165

Graphical Abstract
  • equilibrium. The suspension was then irradiated under a UV light source under constant stirring. The photocatalytic reaction was monitored using UVvis spectroscopy on each solution aliquot (1 mL) taken at 10 min intervals. The UV–vis spectra recorded at the maximum absorbance for methyl violet dye (464 nm
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Published 09 Dec 2020

PEG/PEI-functionalized single-walled carbon nanotubes as delivery carriers for doxorubicin: synthesis, characterization, and in vitro evaluation

  • Shuoye Yang,
  • Zhenwei Wang,
  • Yahong Ping,
  • Yuying Miao,
  • Yongmei Xiao,
  • Lingbo Qu,
  • Lu Zhang,
  • Yuansen Hu and
  • Jinshui Wang

Beilstein J. Nanotechnol. 2020, 11, 1728–1741, doi:10.3762/bjnano.11.155

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  • stored overnight at 4 °C. The different DOX-loaded formulations were centrifugated 3–5 times for separating unencapsulated drugs. The supernatant liquid was stored for measuring the absorbance at 480 nm by UVvis spectroscopy according to the preestablished standard curve. The drug loading efficiency (LE
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Published 13 Nov 2020

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

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  • (SEM), energy-dispersive X-ray spectroscopy (EDX), and UVvis spectroscopy. The optical absorption decreased and the optical energy gap of α-Ag2S increased from 1.5 to 2 eV after the CTAB surfactant was added to the Tu solution. XRD studies revealed that the synthesized Ag2S NPs were polycrystalline
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Published 21 Oct 2020

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

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  • degradation of MP on the surface of Cu2O NPs is in progress. Scheme 1 shows the observed degradation pathway considering all the NMR results obtained. Degradation study of MP using UVvis spectroscopy NMR results indicate that one of the degradation products obtained is 4-nitrophenol (4-NPh). The presence of
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Published 12 Oct 2020

Role of redox-active axial ligands of metal porphyrins adsorbed at solid–liquid interfaces in a liquid-STM setup

  • Thomas Habets,
  • Sylvia Speller and
  • Johannes A. A. W. Elemans

Beilstein J. Nanotechnol. 2020, 11, 1264–1271, doi:10.3762/bjnano.11.110

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  • supernatant solution. To investigate changes in supernatant composition during the STM experiments, ex situ UVvis spectroscopy measurements were carried out. UV–vis spectra of supernatant solutions from different experiments in the modified STM setup using MnTUPCl and MnTUPOAc are depicted in Figure 3. The
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Published 24 Aug 2020

Gram-scale synthesis of splat-shaped Ag–TiO2 nanocomposites for enhanced antimicrobial properties

  • Mohammad Jaber,
  • Asim Mushtaq,
  • Kebiao Zhang,
  • Jindan Wu,
  • Dandan Luo,
  • Zihan Yi,
  • M. Zubair Iqbal and
  • Xiangdong Kong

Beilstein J. Nanotechnol. 2020, 11, 1119–1125, doi:10.3762/bjnano.11.96

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  • spectroscopy (FTIR, Nicolet IS50) was used to measure the infrared spectra. To detect the absorption profile of the prepared samples, the UVvis spectroscopy technique was used. In vitro cytotoxicity The Cell Counting Kit-8 (CCK-8) was purchased from Beyotime Biotechnology (Shanghai, China). Human colon
  • –TiO2 nanocomposites with different Ag content. (d, e, f) are the respective EDS spectra. Scale bars are 200 nm (a, b) and 1 µm (c). FTIR and UVvis spectroscopy spectra of the pure TiO2 NPs and Ag–TiO2 nanocomposites. The in vitro cytotoxicity of the Ag–TiO2 nanocomposites at different concentrations
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Published 29 Jul 2020

Straightforward synthesis of gold nanoparticles by adding water to an engineered small dendrimer

  • Sébastien Gottis,
  • Régis Laurent,
  • Vincent Collière and
  • Anne-Marie Caminade

Beilstein J. Nanotechnol. 2020, 11, 1110–1118, doi:10.3762/bjnano.11.95

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  • reaction was rapidly observed at room temperature showing that this reagent is indeed able to reduce gold. However, the final solution was black and, therefore, there is no nanoparticle, as shown by UVvis spectroscopy. Thus, the results suggest that the Girard’s T reagent is a stronger reductant than the
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Published 28 Jul 2020

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

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  • Ce6 and FLG. Red spheres represent the out-of-plane moieties responsible for the stabilization of the hybrid nanomaterial in water by the oxygen atoms. Figure 3a shows the characterization results from UVvis spectroscopy experiments on FLG-Ce6 and Ce6. The absorption spectrum of FLG-Ce6 shows
  • supernatant was filtered and washed with deionized water and resuspended in 10 mL of deionized water. The synthesis methodology was always carried out under sterile conditions. Characterization The UVvis spectroscopy characterization was carried out with a Cary 60 UV–visible spectrophotometer using 10 mm
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Published 17 Jul 2020

A 3D-polyphenylalanine network inside porous alumina: Synthesis and characterization of an inorganic–organic composite membrane

  • Jonathan Stott and
  • Jörg J. Schneider

Beilstein J. Nanotechnol. 2020, 11, 938–951, doi:10.3762/bjnano.11.78

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  • . Subsequently, the concentration of chloroanilic acid in the collected solution was determined with UVvis-spectroscopy. The amount of adsorbed chloroanilic acid was calculated from the absorbance of the analyte stock solution (see Figure 12). Unfunctionalized ALOX-membranes adsorb 16.7% of chloroanilic acid
  • methanol followed by equilibration with 2 mL of deionized water with the same flow rate. The amount of adsorbed chloroanilic acid (analyte) was determined from the collected solution of the loading step by UVvis spectroscopy at a wavelength of 331 nm [73]. The membranes were placed in a stainless-steel
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Published 17 Jun 2020

Band tail state related photoluminescence and photoresponse of ZnMgO solid solution nanostructured films

  • Vadim Morari,
  • Aida Pantazi,
  • Nicolai Curmei,
  • Vitalie Postolache,
  • Emil V. Rusu,
  • Marius Enachescu,
  • Ion M. Tiginyanu and
  • Veaceslav V. Ursaki

Beilstein J. Nanotechnol. 2020, 11, 899–910, doi:10.3762/bjnano.11.75

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  • microscopy (AFM), UVvis spectroscopy, photoluminescence (PL) and resistivity measurements in Zn1−xMgxO thin films deposited by the sol–gel spin-coating route in the composition range x = 0.00–0.40 [23]. It was found that the phase segregation manifests itself starting at a Mg content of x = 0.25. However
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Published 12 Jun 2020

Exfoliation in a low boiling point solvent and electrochemical applications of MoO3

  • Matangi Sricharan,
  • Bikesh Gupta,
  • Sreejesh Moolayadukkam and
  • H. S. S. Ramakrishna Matte

Beilstein J. Nanotechnol. 2020, 11, 662–670, doi:10.3762/bjnano.11.52

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  • + in the presence of UV light. This was further confirmed using Raman spectroscopy and UVvis spectroscopy (Supporting Information File 1, Figure S5). The Raman spectra of bulk and exfoliated MoO3 in 2-butanone, IPA and an IPA/H2O mixture are shown in Figure 2e. Bulk and exfoliated MoO3 in 2-butanone
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Published 17 Apr 2020

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

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  • vis spectroscopy show that the isomerisation is even improved compared to the free ligands when they are coordinated to the external surface of the hybrid perovskite (Figure 7). We deduce that an energy transfer from a virtual level of the excited hybrid perovskite to the azobenzene occurs. Time
  • ligands are incorporated into the 2D LHPs (Figure 7). However, a minor fraction of the azobenzene molecules is also present at the surface of the crystals. For a reliable analysis of the behaviour of these species, we have also studied 3D hybrid perovskite particles in detail. Findings from 1H NMR and UV
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Published 17 Mar 2020

Nanoparticles based on the zwitterionic pillar[5]arene and Ag+: synthesis, self-assembly and cytotoxicity in the human lung cancer cell line A549

  • Dmitriy N. Shurpik,
  • Denis A. Sevastyanov,
  • Pavel V. Zelenikhin,
  • Pavel L. Padnya,
  • Vladimir G. Evtugyn,
  • Yuriy N. Osin and
  • Ivan I. Stoikov

Beilstein J. Nanotechnol. 2020, 11, 421–431, doi:10.3762/bjnano.11.33

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  • step was the study of the interaction of pillar[5]arenes 3 and 4 with AgNO3 by DLS, UV–vis and 1H, 13C, 2D NMR spectroscopy. It was shown by UVvis spectroscopy that addition of an excess of AgNO3 to macrocycles 3 and 4 does not lead to an absorption maximum shift. It is worth noting that, in the case
  • flow rate of 10 L∙min−1. The compounds were dissolved in acetonitrile to a concentration of 10−6 g/L. The data was processed using DataAnalysis 4.0 (Bruker Daltonik GmbH, Bremen, Germany). UVvis spectroscopy UV–vis spectra were recorded using the Shimadzu UV-3600 spectrometer (cell thickness 1 cm
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Published 05 Mar 2020

Fabrication of Ag-modified hollow titania spheres via controlled silver diffusion in Ag–TiO2 core–shell nanostructures

  • Bartosz Bartosewicz,
  • Malwina Liszewska,
  • Bogusław Budner,
  • Marta Michalska-Domańska,
  • Krzysztof Kopczyński and
  • Bartłomiej J. Jankiewicz

Beilstein J. Nanotechnol. 2020, 11, 141–146, doi:10.3762/bjnano.11.12

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  • investigated using SEM and X-ray photoelectron spectroscopy, respectively. The optical properties of the synthesized structures were characterized using UVvis spectroscopy. Ag–TiO2 hollow nanostructures with different optical properties were prepared simply by a change of the annealing time in the last
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Published 10 Jan 2020
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