Use of Redox Probes for Characterization of Layer-by-Layer Gold Nanoparticle-Modified Screen-Printed Carbon Electrodes

Bishop, Gregory W.; Ahiadu, Ben K; Smith, Jordan L.; Patterson, Jeremy D.

doi:10.1149/2.0431702jes

Cited by 23 publications

(24 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To investigate the possible reason for this selectively increased electroactivity, the electroactive area of the untreated and LIFT treated Pt electrodes, respectively, has been determined by studying the electroactivity of the [Fe(CN) 6 ] 4− /[Fe(CN) 6 ] 3− redox couple. The electroactive area measurements, were estimated according to Randles–Sevcik equation (Equation (1)) by CV experiments at scan rate between 0.005 and 0.5 V s −1 in 10 mM [Fe(CN) 6 ] 3− in 0.4 M KCl: Ip = (2.69 × 10 5 )n 3/2 AD 1/2 C v 1/2 , where Ip is the peak current in amperes, n the number of exchanged electrons ( n = 1 for ferricyanide/ferrocyanide red-ox pair), A the electrode area in cm 2 , D the diffusion coefficient (D = 7.60 × 10 −6 cm 2 s −1 for ferricyanide 10 mM in KCl 0.4 M [26]), C the concentration in mol cm −3 and v the sweep rate in V s −1 [27]. Surprisingly, the measured electroactive areas were found similar (8.1 × 10 −2 cm 2 for the untreated and 6.4 × 10 −2 cm 2 for the phosphate buffer 0.1 M LIFT treated electrodes) both obtained using 10 mM [Fe(CN) 6 ] 3− in 0.4 M KCl.…”

Section: Resultsmentioning

confidence: 99%

Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection

et al. 2018

View full text Add to dashboard Cite

The design of new materials as active layers is important for electrochemical sensor and biosensor development. Among the techniques for the modification and functionalization of electrodes, the laser induced forward transfer (LIFT) has emerged as a powerful physisorption method for the deposition of various materials (even labile materials like enzymes) that results in intimate and stable contact with target surface. In this work, Pt, Au, and glassy carbon screen printed electrodes (SPEs) treated by LIFT with phosphate buffer have been characterized by scanning electron microscopy and atomic force microscopy to reveal a flattening effect of all surfaces. The electrochemical characterization by cyclic voltammetry shows significant differences depending on the electrode material. The electroactivity of Au is reduced while that of glassy carbon and Pt is greatly enhanced. In particular, the electrochemical behavior of a phosphate LIFT treated Pt showed a marked enrichment of hydrogen adsorbed layer, suggesting an elevated electrocatalytic activity towards glucose oxidation. When Pt electrodes modified in this way were used as an effective glucose sensor, a 1–10 mM linear response and a 10 µM detection limit were obtained. A possible role of phosphate that was securely immobilized on a Pt surface, as evidenced by XPS analysis, enhancing the glucose electrooxidation is discussed.

show abstract

Section: Resultsmentioning

confidence: 99%

Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Then, graphite or N-doped graphite powder (0.94 g) was added, and the mixture was sonicated for an additional 40 min. SPCE and N-SPCE working electrodes were manually printed onto plastic cellulose acetate sheets using a 110-mesh screen prepared as previously described [37].…”

Section: Methodsmentioning

confidence: 99%

Screen-Printed Soft-Nitrided Carbon Electrodes for Detection of Hydrogen Peroxide

Ogbu

Feng

Dada

et al. 2019

Sensors

Self Cite

View full text Add to dashboard Cite

Nitrogen-doped carbon materials have garnered much interest due to their electrocatalytic activity towards important reactions such as the reduction of hydrogen peroxide. N-doped carbon materials are typically prepared and deposited on solid conductive supports, which can sometimes involve time-consuming, complex, and/or costly procedures. Here, nitrogen-doped screen-printed carbon electrodes (N-SPCEs) were fabricated directly from a lab-formulated ink composed of graphite that was modified with surface nitrogen groups by a simple soft nitriding technique. N-SPCEs prepared from inexpensive starting materials (graphite powder and urea) demonstrated good electrocatalytic activity towards hydrogen peroxide reduction. Amperometric detection of H2O2 using N-SPCEs with an applied potential of −0.4 V (vs. Ag/AgCl) exhibited good reproducibility and stability as well as a reasonable limit of detection (2.5 µM) and wide linear range (0.020 to 5.3 mM).

show abstract

“…For comparison, the two-solution dip method is more than 5 times more efficient than a similar synthetic path to deposit PB on porous alumina [74]. The PBNP@ treated PGs and PBNP@treated graphite rods have comparable electrochemistry to PB on Pt [72] or Au [75,76], making the PBNP@treated graphites cheap and commercially feasible alternatives to these other expensive ones. These findings are important to sensing, ion selectivity for [83] capture/release systems, energy storage and conversion systems.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical stability and capacitance of in-situ synthesized Prussian blue on thermally-activated graphite

et al. 2019

View full text Add to dashboard Cite

The search has been on for years to find at least, a stable, high surface area scaffold for Prussian blue (PB) and its analogs. If successful, PB's vast potential applications could be practicable. This, is besides other innate issues with PB such as poor cycle stability, low electronic conductivity to mention a few. For the first time, a stable Prussian blue@thermally activated graphite felt scaffold, with cycling stability of 2100 cycles, from − 0.5 to 1.3 V, and in 1 M KCl, for at least 36 h is reported. At the end of 2100 CV cycles, sample capacitance more than tripled (381 mF cm −2 compared to 120 mF cm −2 at start of experiment). These properties suggest a practical ion-sieve for specific cation removal from contaminated water. Two new synthesis protocols were employed to achieve this: (a) a first time, single solution PB synthesis without externally applied potential, current or even elevated temperature and (b) a two-step solution-dipping process not involving acidic conditions. PB from both protocols exhibited similar electrochemical characteristics even though the electron relay paths along their charge transfer complexes are different. When probed for its HOMO characteristics, the PB@thermally-treated graphite showed no significant electronic difference from the thermally-treated felt scaffold, suggesting non-compromise of the treated graphite by the PB. Besides cation removal, the electrochemical and electronic properties of these PB@treated graphites suggest multiple electrochemical, non-electrochemical and electronic applications with intact structural and functional integrity.

show abstract

Use of Redox Probes for Characterization of Layer-by-Layer Gold Nanoparticle-Modified Screen-Printed Carbon Electrodes

Cited by 23 publications

References 46 publications

Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection

Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection

Screen-Printed Soft-Nitrided Carbon Electrodes for Detection of Hydrogen Peroxide

Electrochemical stability and capacitance of in-situ synthesized Prussian blue on thermally-activated graphite

Contact Info

Product

Resources

About