In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation

• Eva-Maria Steyskal,
• Stefan Topolovec,
• Stephan Landgraf,
• Heinz Krenn and
• Roland Würschum

Beilstein J. Nanotechnol. 2013, 4, 394–399, doi:10.3762/bjnano.4.46

• relative to Ag/AgCl. As reference values for the resistance and the magnetic moment, the initial values R0 and m0 of the respective measurement were used. Results Charging was performed by the electrochemical methods of cyclic voltammetry, with a constant scan rate of 0.5 mV/s, or chronoamperometry (CA

• resistance variation were found by chronoamperometry and cyclic voltammetry. The combination of SQUID magnetometry and in situ cyclic voltammetry opens up attractive potentials for studying nanophase materials under full electrochemical control. Steady-state cyclic voltammograms (CVs) of porous

Electrospinning preparation and electrical and biological properties of ferrocene/poly(vinylpyrrolidone) composite nanofibers

• Ji-Hong Chai and
• Qing-Sheng Wu

Beilstein J. Nanotechnol. 2013, 4, 189–197, doi:10.3762/bjnano.4.19

• model organisms. The nanofibers fabricated by this method showed obvious antibacterial activity. Electrochemical properties were characterized based on cyclic voltammetry measurements. The CV results showed redox peaks corresponding to the Fc+/Fc couple, which suggested that Fc molecules encapsulated

Revealing thermal effects in the electronic transport through irradiated atomic metal point contacts

• Bastian Kopp,
• Zhiwei Yi,
• Daniel Benner,
• Fang-Qing Xie,
• Christian Obermair,
• Thomas Schimmel,
• Johannes Boneberg,
• Paul Leiderer and
• Elke Scheer

Beilstein J. Nanotechnol. 2012, 3, 703–711, doi:10.3762/bjnano.3.80

• potential origin of the light-induced signals. To check this hypothesis, cyclic voltammetry was performed at different temperatures by directly heating up the whole setup in a stove. Cyclic voltammograms (CVs) recorded at 45 and 35 °C are shown in Figure 5, which indicates that the redox peak shifted to

• drop across the series resistance. This signal, as well as the voltage drop Usample across the sample are measured with fast voltage amplifiers (Femto DLPVA-100-F-D). All signals are fed to a digital storage oscilloscope (LeCroy Waverunner 6050A). Cyclic voltammetry The cyclic voltammograms were

• was heated in a stove for five minutes at a preset temperature, monitored by a thermocouple to a precision of ± 2 °C. Then the cyclic voltammetry was performed in situ. A home-made electrochemical setup (as shown in Figure 13) was used to investigate the light-induced transport changes in the liquid

Glassy carbon electrodes modified with multiwalled carbon nanotubes for the determination of ascorbic acid by square-wave voltammetry

• Sushil Kumar and
• Victoria Vicente-Beckett

Beilstein J. Nanotechnol. 2012, 3, 388–396, doi:10.3762/bjnano.3.45

• voltammetry (SWV). The oxidation of ascorbic acid at the modified glassy carbon electrode showed a peak potential at 315 mV, about 80 mV lower than that observed at the bare (unmodified) electrode. The peak current was about threefold higher than the response at the bare electrode. Replicate measurements of

• no significant difference (P = 0.05). Keywords: ascorbic acid; carbon nanotubes; glassy carbon electrode; square-wave voltammetry; Introduction L-ascorbic acid (AA), also known as vitamin C, is a well-known antioxidant, which helps the human body to reduce oxidative damage and protects food quality

• expensive. The spectrophotometric method suffers from poor selectivity due to interference from other compounds present in commercial fruit juices (e.g., sugars or glucuronic acid) while citrate may affect enzymatic methods [7]. Electrochemical techniques, particularly cyclic voltammetry (CV) and square

The atomic force microscope as a mechano–electrochemical pen

• Christian Obermair,
• Andreas Wagner and
• Thomas Schimmel

Beilstein J. Nanotechnol. 2011, 2, 659–664, doi:10.3762/bjnano.2.70

• , simultaneously the passivation layer is partially removed, site-selectively, with the tip of an AFM. The appropriate electrochemical potential is determined by cyclic voltammetry, and a cathodic potential is selected so as to be too low to lead to an overall growth of the metal film in spite of the passivation

Electrochemical behavior of dye-linked L-proline dehydrogenase on glassy carbon electrodes modified by multi-walled carbon nanotubes

• Haitao Zheng,
• Leyi Lin,
• Yosuke Okezaki,
• Ryushi Kawakami,
• Haruhiko Sakuraba,
• Toshihisa Ohshima,
• Keiichi Takagi and
• Shin-ichiro Suye

Beilstein J. Nanotechnol. 2010, 1, 135–141, doi:10.3762/bjnano.1.16

• long-time ultrasonication (30 min) used. Electrochemical behavior of L-proDH on MWCNTs–modified GC electrode The electrochemical properties of GC/MWCNTs were first investigated by cyclic voltammetry with K3Fe(CN)6 as the probe. Typical reversible cyclic voltammograms were observed for both the bare and