Oxidative stabilization of polyacrylonitrile nanofibers and carbon nanofibers containing graphene oxide (GO): a spectroscopic and electrochemical study

• İlknur Gergin,
• Ezgi Ismar and
• A. Sezai Sarac

Beilstein J. Nanotechnol. 2017, 8, 1616–1628, doi:10.3762/bjnano.8.161

• analyzer, and thermal studies are conducted by using thermogravimetric analysis. Electrochemical impedance spectroscopy, and cyclic voltammetry are used to investigate capacitive behavior of the products. The proposed equivalent circuit model was consistent with charge-transfer processes taking place at

• sample morphologies were characterized by scanning electron microscopy (Gemini Leo Supra 35 VP) and samples were coated with thin gold film using a sputter coater to prevent the accumulation of charge on their surface. Electrochemical performances of nanofibers were analyzed by using cyclic voltammetry

• capacitance because of layered graphene sheets [24]. Electrochemical impedance studies of PAN and GO-containing PAN-based nanofibers A standard three-electrode cell was used to study electrochemical performances of nanofibers by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS

Fabrication of hierarchically porous TiO₂ nanofibers by microemulsion electrospinning and their application as anode material for lithium-ion batteries

• Jin Zhang,
• Yibing Cai,
• Xuebin Hou,
• Xiaofei Song,
• Pengfei Lv,
• Huimin Zhou and
• Qufu Wei

Beilstein J. Nanotechnol. 2017, 8, 1297–1306, doi:10.3762/bjnano.8.131

• constant current density of 40 mA·g−1 in the voltage range of 0.01–3.0 V (vs Li+/Li). The cyclic voltammetry curves were tested at a scanning rate of 0.1 mV/s over the voltage range of 0.01–3.0 V (vs Li+/Li) with a CHI660e electrochemical workstation. Results and Discussion Thermal properties and

• performances The electrochemical properties of TiO2 nanofiber electrodes were investigated by cyclic voltammetry (CV) test using lithium foil as counter electrode and reference electrode. The CV curves of sample A2 and solid TiO2 nanofibers examined in the range of 0.01–3 V (vs Li+/Li) at a scanning rate of

Synthesis of graphene–transition metal oxide hybrid nanoparticles and their application in various fields

• Arpita Jana,
• Elke Scheer and
• Sebastian Polarz

Beilstein J. Nanotechnol. 2017, 8, 688–714, doi:10.3762/bjnano.8.74

• redox flow batteries [125]. During cycling voltammetry, the almost insulating Mn3O4 is electrochemically oxidised to the more conductive MnO2. This explains the interesting phenomenon of increasing capacitance with cycling [126]. The Mn3O4–graphene hybrid has been also used for the ultrafast oxidative

Carbon nanotube-wrapped Fe₂O₃ anode with improved performance for lithium-ion batteries

• Guoliang Gao,
• Yan Jin,
• Qun Zeng,
• Deyu Wang and
• Cai Shen

Beilstein J. Nanotechnol. 2017, 8, 649–656, doi:10.3762/bjnano.8.69

• oxygen levels of less than 0.1 ppm. The assembled cells were kept at room temperature for 12 h before electrochemical performance test Electrochemical performance of the assembled cells were then tested by galvanostatic charge/discharge measurements, cyclic voltammetry (CV) and electrochemical impedance

• spectroscopy (EIS). Charge/discharge tests of the assembled cells were carried out using a commercial battery test system (LAND model, CT2001A) at a constant current in the potential range of 0.01–3.00 V (vs Li/Li+). The cyclic voltammetry measurements were conducted in the same potential window at a scanning

Phosphorus-doped silicon nanorod anodes for high power lithium-ion batteries

• Chao Yan,
• Qianru Liu,
• Jianzhi Gao,
• Zhibo Yang and
• Deyan He

Beilstein J. Nanotechnol. 2017, 8, 222–228, doi:10.3762/bjnano.8.24

• reaction of CuO. The galvanostatic discharge–charge profiles given in Figure 4a indicate that the discharge voltage signature of CuO disappears after the first discharge when the voltage cut-off window was set in the range between 0.02–0.7 V, which was further proven by the cyclic voltammetry (CV) curves

A novel electrochemical nanobiosensor for the ultrasensitive and specific detection of femtomolar-level gastric cancer biomarker miRNA-106a

• Maryam Daneshpour,
• Kobra Omidfar and
• Hossein Ghanbarian

Beilstein J. Nanotechnol. 2016, 7, 2023–2036, doi:10.3762/bjnano.7.193

• miRNA were confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) methods. Differential pulse voltammetry (DPV) was used for quantitative evaluation of miR-106a via recording the reduction peak current of gold nanoparticles. The electrochemical signal had a linear

• -characterized nanomaterial and the complementarity principle of nucleic acid molecules, this electrochemical nanobiosensor showed remarkable accuracy in evaluating miRNA target concentrations via differential pulse voltammetry (DPV) analyses. The principal steps of the biosensing procedure are schematically

• SPCEs to perform the second hybridization step. After 1 h of incubation, the electrodes were washed with Tris buffer and investigated through electrochemical measurements [42][58]. Electrochemical measurement Cyclic voltammetry (CV), differential pulse voltammetry (DPV) and impedimetry methods were used

Effect of nanostructured carbon coatings on the electrochemical performance of Li_1.4Ni_0.5Mn_0.5O_2+x-based cathode materials

• Konstantin A. Kurilenko,
• Oleg A. Shlyakhtin,
• Oleg A. Brylev,
• Dmitry I. Petukhov and
• Alexey V. Garshev

Beilstein J. Nanotechnol. 2016, 7, 1960–1970, doi:10.3762/bjnano.7.187

• nanocomposites were studied by cyclic voltammetry (CVA) to estimate the influence of carbon coatings on the lithium intercalation–deintercalation in Li1.4Ni0.5Mn0.5O2+x (Figure 4). Concerning the LNM/C composites, the cathodic peaks are substantially narrower than the ones for pure Li1.4Ni0.5Mn0.5O2+x. In the

Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors

• Celia García-Hernández,
• Cristina García-Cabezón,
• Fernando Martín-Pedrosa,
• José Antonio De Saja and
• María Luz Rodríguez-Méndez

Beilstein J. Nanotechnol. 2016, 7, 1948–1959, doi:10.3762/bjnano.7.186

• LuPc2 on the top of the PEDOT/PSS film by means of spin coating to obtain PEDOT/PSS/AuNP, PEDOT/PSS/CuPc and PEDOT/PSS/LuPc2 sensors, respectively. The electrodes were used as the working electrodes in cyclic voltammetry. The sensing properties and any synergistic effects in the layered composite

• /PSS/EM electrodes were analyzed using cyclic voltammetry. Voltammograms of PEDOT/PSS, PEDOT/PSS/AuNPs, PEDOT/PSS/CuPc and PEDOT/PSS/LuPc2 electrodes immersed in catechol and hydroquinone 1.5 × 10−4 mol·L−1 with 0.01 mol·L−1 phosphate buffer as the supporting electrolyte are shown in Figure 2. The

• corresponding PEDOT/PSS, PEDOT/PSS/EM or PEDOT/PSS/EM-Enz modified electrode as the working electrode; the reference electrode was Ag|AgCl/KCl 3 mol/L and the counter electrode was a platinum sheet with a surface area of 1 cm2. Cyclic voltammetry was carried out from −0.6 V to +1.2 V (vs Ag/AgCl) with a scan

Evolution of the graphite surface in phosphoric acid: an AFM and Raman study

• Rossella Yivlialin,
• Luigi Brambilla,
• Gianlorenzo Bussetti,
• Matteo Tommasini,
• Andrea Li Bassi,
• Carlo Spartaco Casari,
• Matteo Passoni,
• Franco Ciccacci,
• Lamberto Duò and
• Chiara Castiglioni

Beilstein J. Nanotechnol. 2016, 7, 1878–1884, doi:10.3762/bjnano.7.180

• system, i.e., the cyclic-voltammetry (CV) curve, presents a single feature during the first EC potential sweep, but it disappears during the second scan. On the other hand, EC atomic force microscopy (EC-AFM) measurements, performed in situ in the EC cell, reveal a significant increase of the surface

• not occur. When the EC potential is swept towards more positive values, the anodic current increases and a clear feature in the cyclic voltammetry (CV) curve is observed at about +1.48 V (Figure 1a), indicating that a charge transfer process is activated at the graphite electrode. Interestingly, no CV

• hypotheses should be carefully validated by further experiments carried out in different CV regimes and cycling. Conclusion The effect of phosphoric acid solution (2 M) on the surface of HOPG submerged in an EC bath has been studied by conventional cyclic voltammetry (CV). The EC characterization reveals the

Monolayer graphene/SiC Schottky barrier diodes with improved barrier height uniformity as a sensing platform for the detection of heavy metals

• Ivan Shtepliuk,
• Jens Eriksson,
• Volodymyr Khranovskyy,
• Tihomir Iakimov,
• Anita Lloyd Spetz and
• Rositsa Yakimova

Beilstein J. Nanotechnol. 2016, 7, 1800–1814, doi:10.3762/bjnano.7.173

• substances to be detected. To get a full picture of the state of the art describing all meaningful existing approaches to detect heavy metals, we also need to mention anode stripping voltammetry (ASV). ASV uses carbon, mercury and bismuth electrodes (and others) and is a well-known method for the

Improved lithium-ion battery anode capacity with a network of easily fabricated spindle-like carbon nanofibers

• Mengting Liu,
• Wenhe Xie,
• Lili Gu,
• Tianfeng Qin,
• Xiaoyi Hou and
• Deyan He

Beilstein J. Nanotechnol. 2016, 7, 1289–1295, doi:10.3762/bjnano.7.120

• %, respectively. The electrochemical performance of the beaded nanofiber carbon network anchored with MnO and N was investigated as a working electrode of CR2032-type coin cell with lithium foil as the counter and reference electrodes. Figure 3a shows the typical cyclic voltammetry (CV) curves of the initial

• cycling and rate tests of the cells were measured using a Neware BTS-610 multichannel battery tester at room temperature. Cyclic voltammetry measurements were performed over a potential window of 0.02–3.00 V vs Li/Li+ at a scanning rate of 0.1 mV s−1 with a CHI-660C electrochemical workstation. (a) SEM

• voltammetry curves, (b) galvanostatic discharge–charge profiles, (c) rate capacity, and (d, e) cycling performance of the network of spindle-like carbon nanofibers anchored with MnO and N. Lithium storage performance of some comparable MnO–C-composite-based anodes for lithium-ion batteries (LIBs

In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying

• Eva-Maria Steyskal,
• Christopher Wiednig,
• Norbert Enzinger and
• Roland Würschum

Beilstein J. Nanotechnol. 2016, 7, 1197–1201, doi:10.3762/bjnano.7.110

• voltammetry in the hydrogen regime the electrical resistance changes reversibly by almost 10% upon absorbing approximately 5% H/Pd (atomic ratio). By suitable loading procedures, hydrogen concentrations up to almost 60% H/Pd were obtained, along with a sample thickness increase of about 5%. The observed

• regime. Nanoporous metals freshly prepared by dealloying are in a strongly oxidized condition, associated with particular physical properties [15][16][12][13]. By suitable treatment, i.e., repeated cyclic voltammetry (CV) in a wide potential range, the sample can be reduced until finally a metallic CV

• properties of Pd, is associated with resistance variations ΔR/R0 of approximately 7% and a thickness increase ΔL/L0 of about 0.5%. This regime was investigated in more detail by cyclic voltammetry at a very slow scan rate of 0.1 mV/s. Figure 2 shows the relative variations of electrical resistance and sample

Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

• Refat Abdel-Hamid and
• Emad F. Newair

Beilstein J. Nanotechnol. 2016, 7, 1104–1112, doi:10.3762/bjnano.7.103

• /MWCNT/GCE) electrochemical sensor was prepared for direct determination of the total phenolic content (TPC) as gallic acid equivalent. The GCE working electrode was electrochemically modified and characterized using scanning electron microscope (SEM), cyclic voltammetry (CV), chronoamperometry and

• positive potential values. The dependence of peak current on accumulation potential, accumulation time and pH were investigated by square-wave voltammetry (SWV) to optimize the experimental conditions for the determination of GA. Using the optimized conditions, the sensor responded linearly to a GA

• developed for determination of GA in a mild neutral conditions. The sensor is based on a poly (melamine) film immobilized on a preanodized screen-printed carbon electrode [5]. A voltammetric determination of GA on a hanging mercury drop electrode was investigated by cathodic adsorptive stripping voltammetry

Role of solvents in the electronic transport properties of single-molecule junctions

• Katharina Luka-Guth,
• Sebastian Hambsch,
• Andreas Bloch,
• Philipp Ehrenreich,
• Bernd Michael Briechle,
• Filip Kilibarda,
• Torsten Sendler,
• Dmytro Sysoiev,
• Thomas Huhn,
• Artur Erbe and
• Elke Scheer

Beilstein J. Nanotechnol. 2016, 7, 1055–1067, doi:10.3762/bjnano.7.99

• in recent experimental and theoretical work to be able to tune the conductance markedly [13][21]. While we cannot exclude dipolar effects to be active, we conclude that electrochemical processes in the junction, as known from cyclic voltammetry [23], e.g., oxidation and reduction of the solvent, must

Large-scale fabrication of achiral plasmonic metamaterials with giant chiroptical response

• Morten Slyngborg,
• Yao-Chung Tsao and
• Peter Fojan

Beilstein J. Nanotechnol. 2016, 7, 914–925, doi:10.3762/bjnano.7.83

• study electron transfer in cyclic voltammetry [45]. Cysteamine is the simplest stable aminothiol, hence it readily adsorbs onto gold surfaces and forms a self-assembled monolayer which is often used as the first layer in the functionalization of surfaces [46]. In all experiments the ECM fabricated with

Gold nanoparticles covalently assembled onto vesicle structures as possible biosensing platform

• M. Fátima Barroso,
• M. Alejandra Luna,
• Juan S. Flores Tabares,
• Cristina Delerue-Matos,
• N. Mariano Correa,
• Fernando Moyano and
• Patricia G. Molina

Beilstein J. Nanotechnol. 2016, 7, 655–663, doi:10.3762/bjnano.7.58

• (SH). After, the AuNPs photochemically synthesized in pure glycerol were mixed and anchored onto SH–DOPC vesicles. The data provided by voltammetry, spectrometry and microscopy techniques indicated that the AuNPs were successfully covalently anchored onto the vesicle bilayer and decorated vesicles

• electrochemical impedance spectroscopy or square wave voltammetry [22][23]. It is known that antibodies can be immobilized onto AuNPs without losing their biological properties [24][25]. Thus, the covalent immobilization of vesicles decorated with AuNPs on a gold surface could increase the amount of immobilized

• order to covalently bind the AuNPs to the bilayer and to immobilize the vesicle on the Au electrode. This nanosystem was characterized by using UV–vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and cyclic voltammetry (CV). The results show that the vesicles were

Comparison of the interactions of daunorubicin in a free form and attached to single-walled carbon nanotubes with model lipid membranes

• Dorota Matyszewska

Beilstein J. Nanotechnol. 2016, 7, 524–532, doi:10.3762/bjnano.7.46

• daunorubicin attached to carbon nanotubes in the mixed layer on the electrode, cyclic voltammetry was performed. The reduction–oxidation peaks observed in voltammograms correspond to the electrode process of the quinone-hydroquinone group (Figure 4) [30]. Basing on the results obtained for the supported mixed

• model membranes containing daunorubicin in the two investigated forms. Cyclic voltammetry performed for the electrodes modified with DPPTE monolayers containing daunorubicin either in the free form or attached to carbon nanotubes proved the presence of the electroactive drug at the electrode surface

Rigid multipodal platforms for metal surfaces

• Michal Valášek,
• Marcin Lindner and
• Marcel Mayor

Beilstein J. Nanotechnol. 2016, 7, 374–405, doi:10.3762/bjnano.7.34

Synthesis and applications of carbon nanomaterials for energy generation and storage

• Marco Notarianni,
• Jinzhang Liu,
• Kristy Vernon and
• Nunzio Motta

Beilstein J. Nanotechnol. 2016, 7, 149–196, doi:10.3762/bjnano.7.17

• in an aqueous buffer solution containing GO where cyclic voltammetry scans are performed between certain voltage ranges [132]; solvothermal reduction where the sealed vial containing GO in a solvent can withstand high temperature and vapor pressure [133]. Much effort has been made by the research

Nanostructured superhydrophobic films synthesized by electrodeposition of fluorinated polyindoles

• Gabriela Ramos Chagas,
• Thierry Darmanin and
• Frédéric Guittard

Beilstein J. Nanotechnol. 2015, 6, 2078–2087, doi:10.3762/bjnano.6.212

• monomers were electropolymerized. First of all, it was necessary to determine the oxidation potential (Eox) of all the monomers. These Eox were determined by cyclic voltammetry and were found to be in the range of 0.9–1.3 V vs SCE for the functionalized monomers, as shown in Table 1. A cyclic voltammogram

Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: sensing properties towards catechol

• Celia García-Hernández,
• Cristina García-Cabezón,
• Cristina Medina-Plaza,
• Fernando Martín-Pedrosa,
• Yolanda Blanco,
• José Antonio de Saja and
• María Luz Rodríguez-Méndez

Beilstein J. Nanotechnol. 2015, 6, 2052–2061, doi:10.3762/bjnano.6.209

• be the most suitable electrodeposition technique to prepare voltammetric sensors. Electrochemical behavior of Ppy/AuNPs prepared using different techniques The electrochemical behavior of Ppy and Ppy/AuNP films was analyzed using cyclic voltammetry in 0.1 mol/L KCl solution. The responses are

• electrochemical experiments. The reference electrode was Ag/AgCl/KCl 3 mol/L and the counter electrode was a platinum wire. Cyclic voltammetry was carried out at room temperature with a scan rate of 0.1 V/s in the potential range between −1.0 V and 0.8 V (vs Ag/AgCl) except otherwise indicated. Calibration curves

Optimized design of a nanostructured SPCE-based multipurpose biosensing platform formed by ferrocene-tethered electrochemically-deposited cauliflower-shaped gold nanoparticles

• Wicem Argoubi,
• Maroua Saadaoui,
• Sami Ben Aoun and
• Noureddine Raouafi

Beilstein J. Nanotechnol. 2015, 6, 1840–1852, doi:10.3762/bjnano.6.187

• and concentration of the ferrocene derivatives have been studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Selectivity and specificity tests have been also performed in the presence of potentially interfering substances to

• competitive proteins using a panel of electrochemical techniques such as cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Application of the two platforms for the detection of hIgG and H2O2 respectively in human serum and in honey are presented

• . In a second step, the direct electrochemical reduction of a 0.25 mM solution of Au(III) cations to Au(0) on the carbon edges allowed for nanostructuring of the surface. Cyclic voltammetry was used to perform this step where the potential was swept from 0.8 to 0.0 V, since gold cations can be easily

Scalable, high performance, enzymatic cathodes based on nanoimprint lithography

• Dmitry Pankratov,
• Richard Sundberg,
• Javier Sotres,
• Dmitry B. Suyatin,
• Ivan Maximov,
• Sergey Shleev and
• Lars Montelius

Beilstein J. Nanotechnol. 2015, 6, 1377–1384, doi:10.3762/bjnano.6.142

• the experimentally measured charge (qreal) associated with the Au oxide reduction process performed by running cyclic voltammetry (Supporting Information File 1, Figure S1). A current peak related to the reduction of the Au was integrated to calculate qreal. The theoretical charge density (σt

Formation of substrate-based gold nanocage chains through dealloying with nitric acid

• Ziren Yan,
• Ying Wu and
• Junwei Di

Beilstein J. Nanotechnol. 2015, 6, 1362–1368, doi:10.3762/bjnano.6.140

• fabricated by galvanic replacement reactions at high temperature (boiling) under stirring [28][29]. However, the ITO-based nanocages were prepared by replacement reactions at 50 °C because high temperatures can release the nanomaterials from the ITO surface. Therefore, we used cyclic voltammetry to examine

• HNO3 for 10 h. When Ag–Au NCs were treated with 10 % H2O2 solution for 10 h, the holes in the walls of Ag–Au NCs became small or vanished but the particles were also distributed (Figure 5A). Furthermore, cyclic voltammetry indicated that some Ag was still residual in the nanoparticles, which is

• potentiostatic method applying a cathodic potential of −0.6 V for 3 s at 30 °C. Next, the AgNPs were grown by a square wave cyclic voltammetry in the range from −0.3 to approx. 0 V for 40 cycles with a frequency of 10 Hz, an amplitude of 25 mV and a potential step of 2 mV. Finally, the strips were rinsed with

Growth and morphological analysis of segmented AuAg alloy nanowires created by pulsed electrodeposition in ion-track etched membranes

• Ina Schubert,
• Loic Burr,
• Christina Trautmann and
• Maria Eugenia Toimil-Molares

Beilstein J. Nanotechnol. 2015, 6, 1272–1280, doi:10.3762/bjnano.6.131

• length in ion-track etched polymer templates was developed. Detailed analysis by cyclic voltammetry in ion-track membranes, energy-dispersive X-ray spectroscopy and scanning electron microscopy was performed to determine the dependency between the chosen potential and the segment composition

• synthesised by electrodeposition in membranes, and are ideal model systems for investigation of surface plasmons. Keywords: AuAg alloy; cyclic voltammetry; electrodeposition; ion-track technology; nanogaps; segmented nanowires; Introduction The synthesis of multicomponent heterostructure nanowires is

• voltammetry and analyze the deposition process in the channels of ion-track etched membranes compared to cyclic voltammetry for macroelectrodes. Experimental Polycarbonate foils (Makrofol N, Bayer AG) with a thickness of 30 μm were irradiated with Au ions (ca. 2 GeV) at the linear accelerator UNILAC at GSI