Achieving Direct Electrical Connection to Glucose Oxidase Using Aligned Single Walled Carbon Nanotube Arrays

Liu, Jingquan; Chou, Alison; Wibowo, Rahmat; Paddon‐Row, Michael N.; Gooding, J. Justin

doi:10.1002/elan.200403116

Cited by 303 publications

(221 citation statements)

References 59 publications

(66 reference statements)

Supporting

Mentioning

203

Contrasting

Unclassified

Order By: Relevance

“…CNTs have raised a considerable interest in electrochemistry as well. The CNT ability to increase electron transfer kinetics [2], to increase the electroactive surface area [3] and to increase the sensitivity of electrochemical [4] and conductometric sensors [5] is well-known. However the electrocatalytic properties of CNTs are strongly influenced by many factors, such as the synthesis methods and procedures to prepare the CNT-modified electrodes [4,6].…”

Section: Introductionmentioning

confidence: 99%

Comparison of two different carbon nanotube-based surfaces with respect to potassium ferricyanide electrochemistry

et al. 2012

View full text Add to dashboard Cite

This paper describes the electrochemical investigation of two multi-walled carbon nanotube-based electrodes using potassium ferricyanide as a benchmark redox system. Carbon nanotubes were fabricated by chemical vapor deposition on silicon wafer with camphor and ferrocene as precursors. Vertically-aligned as well as islands of horizontally-randomly-oriented carbon nanotubes were obtained by varying the growth parameters. Cyclic voltammetry was the employed method for this electrochemical study. Vertical nanotubes showed a slightly higher kinetic. Regarding the sensing parameters we found a sensitivity for vertical nanotubes almost equal to the sensitivity obtained with horizontally/randomly oriented nanotubes (71.5 ± 0.3 μA/(mM cm 2 ) and 62.8± 0.3 μA/(mM cm 2 ), respectively). In addition, values of detection limit are of the same order of magnitude. Although tip contribution to electron emission has been shown to be greatly larger than the lateral contribution on single carbon nanotubes per unit area, the new findings reported in this paper demonstrate that the global effects of nanotube surface on potassium ferricyanide electrochemistry are comparable for these two types of nanostructured surfaces.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparison of two different carbon nanotube-based surfaces with respect to potassium ferricyanide electrochemistry

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The improvement in the active surface area [3], their capability to facilitate redox reactions of many compounds [4], the increase in the sensitivity from millimolar [5] to micromolar ranges [6] advocate to the use of nanotubes as key building blocks to fabricate electrodes. In particular, electrochemical biosensing for medical purposes is one of the most promising application of MWCNTs [7].…”

Section: Introductionmentioning

confidence: 99%

Comparing sensitivities of differently oriented multi-walled carbon nanotubes integrated on silicon wafer for electrochemical biosensors

Taurino¹,

Carrara²,

Giorcelli³

et al. 2011

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

a b s t r a c tIn this study, we report on multi-walled carbon nanotubes fabricated on silicon substrate with four different orientations via chemical vapor deposition. It is well-known that chemical treatments improve the nanotube electrochemical reactivity by creating edge-like defects on their exposed sidewalls. Before use, we performed an acid treatment on carbon nanotubes. To prove the effect of the treatment on these nanostructured electrodes, contact angles were measured. Then, sensitivities and detection limits were evaluated performing cyclic voltammetry. Two target molecules were used: potassium ferricyanide, an inorganic electroactive molecule, and hydrogen peroxide that is a product of reactions catalyzed by many enzymes, such as oxidases and peroxidases. Carbon nanotubes with tilted tips become hydrophilic after the treatment showing a contact angle of 22 • ± 2 • . This kind of electrode has shown also the best electrochemical performance. Sensitivity and detection limit values are 110.0 ± 0.5 A/(mM cm 2 ) and 8 M for potassium ferricyanide solutions and 16.4 ± 0.1 A/(mM cm 2 ) and 24 M using hydrogen peroxide as target compound. Considering the results of wettability and voltammetric measurements, nanotubes with tilted tips-based electrodes are found to be the most promising for future biosensing applications.Crown

show abstract

“…This response is strongly dependent on the way to fabricate carbon electrodes since K 4 Fe(CN) 6 is a "surface sensitive" compound [21]. In particular, the electrochemical investigation of new CNT-based electrodes with K 4 Fe(CN) 6 is largely present in literature [22], [23]. The K 4 Fe(CN) 6 redox reaction at +300 mV is…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Carbon Nanotubes With Different Orientations for Electrochemical Biodevices

et al. 2012

View full text Add to dashboard Cite

Abstract-Carbon nanotubes (CNTs) improve the sensitivity of electrochemical biosensors. An optimized CNT/trasducer integration is required to realize accurate devices. The nanotube orientation on the sensor electrode is a key parameter. The role of the sidewalls and the tips in the electroactivity of the nanosensor is presently investigated in the literature. In addition, nanotube hydrophobicity is a drawback for biosensing purposes. Indeed, samples are always in water conditions and the integration biomacromolecules-CNTs are often required. In this paper, a comparison of CNTs with and without exposed walls before and after an acid treatment is proposed. It is done by using contact angle measurements and electrochemical measurements of the electroactive compound potassium ferricyanide. Finally, the electrochemistry of two biomolecules is investigated with those nanostructures more suitable for biodetection.Index Terms-Chemical vapor deposition, cyclic voltammetry, electrochemical biosensors, etoposide, hydrogen peroxide, multiwalled carbon nanotubes, potassium ferricyanide, wettability.

show abstract

Achieving Direct Electrical Connection to Glucose Oxidase Using Aligned Single Walled Carbon Nanotube Arrays

Cited by 303 publications

References 59 publications

Comparison of two different carbon nanotube-based surfaces with respect to potassium ferricyanide electrochemistry

Comparison of two different carbon nanotube-based surfaces with respect to potassium ferricyanide electrochemistry

Comparing sensitivities of differently oriented multi-walled carbon nanotubes integrated on silicon wafer for electrochemical biosensors

Carbon Nanotubes With Different Orientations for Electrochemical Biodevices

Contact Info

Product

Resources

About