Covalent Adlayer Growth on a Diamond Thin Film Surface

Krysiński, Paweł; Show, Yoshiuki; Stotter, Jason; Blanchard, G. J.

doi:10.1021/ja036077f

Cited by 23 publications

(31 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The background current detected on the SWCNTs modified microelectrodes by EPD (see Fig. 5B) resulted higher than that recorded on the bare SSEs and GC bare electrodes (data not shown) because of the presence of OH groups [22] on the SWCNTs, according to the literature [28]. Considering that the signal to noise ratio resulted of % 3, for 1 mM potassium ferricya- …”

Section: Electrochemical Characterization Of the Cntsses Assembled VImentioning

confidence: 54%

Functionalized Single‐Walled Carbon Nanotubes Modified Microsensors for the Selective Response of Epinephrine in Presence of Ascorbic Acid

et al. 2007

View full text Add to dashboard Cite

Modified stainless steel microelectrodes (microwire diameter: 300 mm) were assembled using functionalized singlewalled carbon nanotubes (SWCNTs) deposited by the EPD method (electrophoretical deposition process). The functionalized SWCNTs, which covered the microelectrode surfaces, showed an improved sensitivity and selectivity toward the electrochemical detection of epinephrine. These chemical sensors hampered the voltammetric responses of ascorbic acid (AA) and uric acid (UA), while the electrochemical oxidation of epinephrine was significantly enhanced. Using the differential pulse voltammetry (DPV) technique, epinephrine showed a very well resolved peak centered around 240 mV, while 1 mM of AA (present in the same solution) was not detected. The corresponding permeability and permselectivity parameters were also evaluated for ascorbic acid and uric acid. To investigate the sensor selectivity, a comparative study performed using microsensors assembled with non functionalized carbon nanotubes, deposited on the microelectrode surfaces by a chemical vapor deposition (CVD) technique, was also carried out. This study was useful to highlight that the presence, or the absence of electrostatic barriers on SWCNTs walls (due to the presence of some chemical functional groups), can be able to control the electrochemical response of these sensors. This optimization resulted in microsensors with a good linear range (2 -100 mM) epinephrine; a good sensitivity (28.1 A M À1 cm À2 ) and interelectrodes reproducibility (RSD% ¼ 7.0, n ¼ 6), a detection of limit (LOD ¼ 3s) of 2 mM; a response time of 6 s; a significant operational stability (of 13 hours in continuous working conditions) and long term stability (1 month).

show abstract

Section: Electrochemical Characterization Of the Cntsses Assembled VImentioning

confidence: 54%

Functionalized Single‐Walled Carbon Nanotubes Modified Microsensors for the Selective Response of Epinephrine in Presence of Ascorbic Acid

et al. 2007

View full text Add to dashboard Cite

show abstract

“…The following grafting process involves either carbonyl terminated films following by dinitrophenylhydrazine grafting [22] or hydroxylated surfaces for anchoring 3-aminopropyltriethoxysilane [23]. Hydroxylated surfaces, obtained by oxidation in piranha solution, were used by Krysinski et al [24] to graft pyrene groups by reacting 1-aminopyrene following a two-steps process in which the BDD surface was modified to the acid chloride intermediate in a first stage.…”

Section: Bdd Derivatization Using Anodically Hydroxylated Surfacesmentioning

confidence: 99%

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

et al. 2005

View full text Add to dashboard Cite

Boron doped diamond (BDD) films are promising materials for electroanalysis and bioelectroanalysis. This contribution gives a short review on BDD functionalization by chemical and biochemical entities and on the applications of BDD electrodes to electroanalysis of chemical compounds of biological interest. This review is illustrated by the developments on BDD interfaces in both these areas carried out in our group. BDD electrodes were prepared by means of microwave plasma-assisted CVD onto silicon substrate giving rise to H-terminated BDD films. Anodic polarization of BDD electrodes in aqueous media generates hydrophilic oxidized surfaces and extended electrochemical window in aqueous media. We took advantage of this enlarged electrochemical window together with the hydroxylated surface for the functionalization of BDD electrode surfaces with biomolecules and for bioelectroanalysis. We have designed a novel route of BDD functionalization using OH terminations of the anodized surface. The modification of the BDD surface with biotin groups will be presented here as biologically active model. Furthermore, as the anodic potential window of BDD increases upon electrochemical activation, 2'-deoxyguanosine (1.2 V vs. Ag/AgCl) and 2'-deoxyadenosine (1.5 V vs. Ag/AgCl) could be detected electrochemically with an acceptable signal to noise ratio. The electrochemical signature of each oxidizable base was assessed using differential pulse voltammetry (DPV). These experiments pointed towards adsorption of the oxidized products, which were investigated macroscopically by DPV and at the microscopic level by SECM (scanning electrochemical microscopy).

show abstract

“…Microcrystalline BDD thin films can be treated with a Piranha solution to produce a hydrophilic surface. 62 Although the procedure is reproducible, the resulting surface is only covered with a small fraction of a monolayer of hydroxyl functionalities. Nevertheless, this surface can be reacted with adipoyl chloride in dry acetonitrile using 4-methylmorpholine as a Lewis base.…”

mentioning

confidence: 99%

Boron-doped diamond electrode: synthesis, characterization, functionalization and analytical applications

Luong¹,

Male²,

Glennon³

2009

Analyst

401

249

View full text Add to dashboard Cite

In recent years, conductive diamond electrodes for electrochemical applications have been a major focus of research and development. The impetus behind such endeavors could be attributed to their wide potential window, low background current, chemical inertness, and mechanical durability. Several analytes can be oxidized by conducting diamond compared to other carbon-based materials before the breakdown of water in aqueous electrolytes. This is important for detecting and/or identifying species in solution since oxygen and hydrogen evolution do not interfere with the analysis. Thus, conductive diamond electrodes take electrochemical detection into new areas and extend their usefulness to analytes which are not feasible with conventional electrode materials. Different types of diamond electrodes, polycrystalline, microcrystalline, nanocrystalline and ultrananocrystalline, have been synthesized and characterized. Of particular interest is the synthesis of boron-doped diamond (BDD) films by chemical vapor deposition on various substrates. In the tetrahedral diamond lattice, each carbon atom is covalently bonded to its neighbors forming an extremely robust crystalline structure. Some carbon atoms in the lattice are substituted with boron to provide electrical conductivity. Modification strategies of doped diamond electrodes with metallic nanoparticles and/or electropolymerized films are of importance to impart novel characteristics or to improve the performance of diamond electrodes. Biofunctionalization of diamond films is also feasible to foster several useful bioanalytical applications. A plethora of opportunities for nanoscale analytical devices based on conducting diamond is anticipated in the very near future

show abstract

Covalent Adlayer Growth on a Diamond Thin Film Surface

Cited by 23 publications

References 16 publications

Functionalized Single‐Walled Carbon Nanotubes Modified Microsensors for the Selective Response of Epinephrine in Presence of Ascorbic Acid

Functionalized Single‐Walled Carbon Nanotubes Modified Microsensors for the Selective Response of Epinephrine in Presence of Ascorbic Acid

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

Boron-doped diamond electrode: synthesis, characterization, functionalization and analytical applications

Contact Info

Product

Resources

About