Scanning Tunneling Microscopic and Voltammetric Studies of the Surface Structures of an Electrochemically Activated Glassy Carbon Electrode

Shi, Kang; Shiu, Kwok Keung

doi:10.1021/ac010734+

Cited by 65 publications

(52 citation statements)

References 32 publications

(78 reference statements)

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“…The electrode was activated by cyclic voltammetry between -0.3 and +2.0 V in 0.5 M H2SO4 at 0.1 V/s until stable voltammograms were obtained. 32 Layer-by-layer (LbL) self-assembly of PDDA and MWCNT-PB composite, designated as {PDDA/MWCNT-PB}n, was carried out as follows. The activated GC electrode with negative surface charges was treated with an aqueous solution of 1 wt% positively charged PDDA in 0.5 M NaCl for 20 min.…”

Section: Preparation Of {Pdda/mwcnt-pb}n Multilayer Filmsmentioning

confidence: 99%

Layer-by-layer Assembly of Prussian Blue and Carbon Nanotube Composites with Poly(diallyldimethylammonium chloride) for the Sensitive Detection of Hydrogen Peroxide

Yao

Shiu

2010

ANAL. SCI.

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Recently, there have been several reports integrating PB and CNT for hydrogen peroxide detection. [24][25][26] In this report, a simple procedure for the deposition of PB on the sidewalls of multi-walled carbon nanotubes (MWCNT) is explained. The resulting MWCNT-PB composite was used as a building block for the fabrication of multilayer structures on glassy carbon electrodes by the layer-by-layer technique. [27][28][29][30][31] Multilayer assemblies of MWCNT-PB composites were obtained by alternative dipping the electrode in separate solutions containing positively charged poly(diallyldimethylammonium chloride) (PDDA) and negatively charged MWCNT-PB composites. The multi-layered film showed sensitive detection for the reduction of hydrogen peroxide. The amount of MWCNT-PB deposits can be easily controlled, and the resulting material affects the sensitivity of the detection. This approach can be applied for the construction of high-performance biosensors and biofuel cells. Experimental Chemicals and reagentsMulti-walled carbon nanotubes were purchased from Nanoport Co. Ltd. (Shenzhen, China), and were treated in a 1:3 (v:v) mixture of concentrated HNO3-H2SO4 at 50 C for 24 h. The CNT materials were then thoroughly washed with doubly distilled water. The functionalized MWCNT materials were obtained by drying in vacuum at 70 C overnight. PDDA with a molecular weight range of 200000 -350000 was purchased 2010 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. Prussian blue (PB) was deposited on multi-walled carbon nanotubes (MWCNT) in an aqueous solution. Multi-layer composites of the MWCNT-PB hybride material were obtained by layer-by-layer assembly with poly(diallyldimethylammonium chloride) (PDDA). The resulting {PDDA/MWCNT-PB}n multilayer films immoblized on glassy carbon electrodes showed sensitive detection for the reduction of hydrogen peroxide. A sensor based on the {PDDA/MWCNT-PB}n multilayer structure was fabricated and showed excellent sensitivity to the electrochemical reduction of hydrogen peroxide. Its response sensitivity increased with the number of the multilayers. A high response sensitivity of 0.83 mA M -1 cm -2 was obtained for a seven-layer sensor. This redox active multilayer structure offers potential applications in the development of high performance biosensors and biofuel cells.

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Section: Preparation Of {Pdda/mwcnt-pb}n Multilayer Filmsmentioning

confidence: 99%

Layer-by-layer Assembly of Prussian Blue and Carbon Nanotube Composites with Poly(diallyldimethylammonium chloride) for the Sensitive Detection of Hydrogen Peroxide

Yao

Shiu

2010

ANAL. SCI.

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“…While the effects of GC pretreatment by anodic oxidation on the electro oxidation of some small organic molecules have been studied [8][9][10], none has studied such effects on the glucose electrocatalytic oxidation albeit of equal importance. Electrochemical pretreatment of glassy carbon (GC) is performed by anodic oxidation [11,12], cathodic reduction [13]or potential cycling [14,15]. The above processes took place in different media, e.g., acidic or alkaline electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Anodic Pretreatment of Glassy Carbon: Impacts on Structural and Electrochemical Characteristics of Niox Nanoparticles

Saleh¹

2017

IJBSBE

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Usually, glassy carbon electrode (GC) is used as it is as a substrate for electrochemically deposited nickel or nickel oxide (NiO x ) nanoparticles. In the present study, GC carbon is anodically oxidized in different media prior to electrode position of NiO x and the impacts of this pretreatment on the structural and electrochemical characteristics of NiO x are studied. Upon anodic pretreatment of GC electrode in acid (0.1 M H 2 SO 4 , GC OX-AC ) and in alkali (0.1 M NaOH, GC OX-AL ), the structural and electrochemical characterizations of nickel oxide (NiO x ) nanoparticles are highly modified. Cyclic voltammetry (CV), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) are used for characterization of the electrodes. While NiOx nanoparticles deposited on GC OX-AC reveal a bird-like shape, it shows semi-spherical shape when it is deposited on either GC or GC OX-AL , with smaller size on the GC OX-AL . The reversibility of the Ni(OH) 2

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“…The electron mediator 3,4-dihydroxybenzaldehyde (3,4-DHB) has been found to modify carbon electrodes with an electroactive film derived from this mediator (Pariente et al, 1994(Pariente et al, , 1995(Pariente et al, , 1996(Pariente et al, , 1997Pamidi and Wang, 1996;Lorenzo et al, 1998;Tobalina et al, 1998;Tzang et al, 2001;Hong et al, 2002;Shi and Shiu, 2002;Antiochia et al, 2004a,b;Delbem et al, 2002;Prieto-Simón and Fàbregas, 2004). The redox species comprising the film has a lower formal potential than 3,4-DHB, favorable kinetics for NADH oxidation, and has been demonstrated to be base stable in the pH region where PDH is expected to have high activity.…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenase based reagentless biosensor for monitoring phenylketonuria

Weiss

Dorris

Loh

et al. 2007

Biosensors and Bioelectronics

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Scanning Tunneling Microscopic and Voltammetric Studies of the Surface Structures of an Electrochemically Activated Glassy Carbon Electrode

Cited by 65 publications

References 32 publications

Layer-by-layer Assembly of Prussian Blue and Carbon Nanotube Composites with Poly(diallyldimethylammonium chloride) for the Sensitive Detection of Hydrogen Peroxide

Layer-by-layer Assembly of Prussian Blue and Carbon Nanotube Composites with Poly(diallyldimethylammonium chloride) for the Sensitive Detection of Hydrogen Peroxide

Anodic Pretreatment of Glassy Carbon: Impacts on Structural and Electrochemical Characteristics of Niox Nanoparticles

Dehydrogenase based reagentless biosensor for monitoring phenylketonuria

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