Nanoelectrode Ensembles Using Carbon Nanopipettes

Lowe, Randall D.; Mani, Radhika C.; Baldwin, Richard P.; Sunkara, Mahendra

doi:10.1149/1.2193071

Cited by 11 publications

(7 citation statements)

References 18 publications

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“…This peak is not present in the subsequent cycles. The half-sigmoidal shape of the CVs indicates a nanoelectrode-like behavior with a steady-state current [22]. This behavior suggests that the diffusion profiles for each Pd/Fe nanodomain do not overlap each other, as a consequence of their proper distribution that is provided inherently by the PC membrane.…”

Section: Characterization Studiesmentioning

confidence: 88%

Palladium nanoparticle-decorated iron nanotubes hosted in a polycarbonate porous membrane: development, characterization, and performance as electrocatalysts of ascorbic acid

et al. 2012

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One-dimensional iron metallic nanotubes were prepared by electroless deposition within the pores of polycarbonate (PC) membranes. The longitudinal nucleation of the nanotubes along the pore walls was achieved by mounting the PC membrane between two halves of a U-shaped reaction tube. Palladium nanoparticles were post-deposited on the inner wall of the nanotubes. The composition, morphology, and structure of the Pd/Fe nanotubes were characterized by transmission electron microscopy, scanning electron microscopy, and inductively coupled plasma-atomic emission spectroscopy. A glassy carbon (GC) electrode modified with the free Pd/Fe bimetallic nanotubes (isolated after the dissolution of the host membranes) showed small improvement on the overpotential oxidation of ascorbic acid in comparison to the bare GC electrode. Alternatively, the Pd/Fe-polycarbonate membrane was covered with a sputtered gold thin layer of 10 nm from one side and mounted in a homemade electrochemical cell acting as the working electrode. The potential use of these functional membranes as catalytic surfaces for the electrochemical monitoring of ascorbic acid was investigated by cyclic voltammetry and amperometry. In the presence of a phosphate buffer solution, pH 7, Pd/Fe-polycarbonate membranes showed excellent electrocatalytic properties toward the oxidation of ascorbic acid even at potentials as low as 0 mV versus a Ag/AgCl reference electrode. In addition to the substantial lower overpotential, these electrodes offered selectivity over acetaminophen and uric acid, and a prolonged working stability without the need for maintenance. The electrodes were kept dry between different working days and retained their original activity for more than 1 week. Pd-polycarbonate and Fe-polycarbonate membranes were also developed for comparison purposes.

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Section: Characterization Studiesmentioning

confidence: 88%

Palladium nanoparticle-decorated iron nanotubes hosted in a polycarbonate porous membrane: development, characterization, and performance as electrocatalysts of ascorbic acid

et al. 2012

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“…Using a SEKI model AX5200S-ECR MWCVD reactor, some other experiments were conducted on CNP array-coated platinum wire substrates using ECR plasma at pressures ranging from 50-100 mTorr with methane composition ranging from 0-5% CH 4 in H 2 using 500 Watts of MW power and Full Paper …”

Section: Methodsmentioning

confidence: 99%

“…[3] The CNP arrays, due to the conical geometry of the individual structures, could easily be made into nanoelectrode ensembles. [4] Furthermore, the conical structures could serve as good templates for producing nanodiamond tip arrays, which could be made into diamond nanoelectrode ensembles easily by the simple polymer-masking technique described in our earlier work. [4] Also, the nanodiamond tip arrays could find interest in functionalized biosensor [5] and field emission [6] applications.…”

Section: Introductionmentioning

confidence: 99%

Nanodiamond Tipped and Coated Conical Carbon Tubular Structures

Chernomordik

Dumpala

Chen

et al. 2008

Chemical Vapor Deposition

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Studies of diamond nucleation and growth on conical carbon tubular structures show that the nucleation preferentially occurs at the tips, but only occurs on the sidewalls when they are pretreated with diamond or other powder dispersions, forming a nanodiamond coating. The high-resolution transmission electron microscopy (HRTEM) studies reveal that the diamond nucleation on the sidewalls may proceed through the formation of diamond nuclei within the walls at subsurface damage sites caused during pretreatment. In the case of experiments with low atomic hydrogen conditions, carbon onion structures are observed on the sidewalls but only with pretreatments.

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“…53 In a method analogous to the insulated fiber optic tips, Lowe et al showed that an ensemble of conical CNTs grown on a Pt electrode could be partially insulated to create a NEE as demonstrated by sigmoidal CV traces showing steady-state diffusion, a characteristic of NEEs. 54 Very high density ensembles, characterized by their bulk addressability, have proven useful in electroanalytical chemistry, especially for the measurement of DNA hybridization. Inspired by the diffusion properties of ever smaller microelectrodes, the template methods developed by Martin to create NEEs have led to numerous devices with improved S/B ratios and lower limits of detection.…”

Section: Applicationsmentioning

confidence: 99%

Very High Density Sensing Arrays

2008

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in 2001. He then joined the laboratory of Professor John Fourkas at Boston College, where his research focused on various aspects of multiphoton fabrication. Having moved with Professor Fourkas to the University of Maryland, College Park, he received his Ph.D. degree in Chemistry from UMCP in 2006. He then joined the laboratory of Professor David Walt at Tufts University, where he was awarded a NIH/NIGMS postdoctoral fellowship. His current research involves the development of a microarraybased optoelectronic chemical sensing platform.

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Nanoelectrode Ensembles Using Carbon Nanopipettes

Cited by 11 publications

References 18 publications

Palladium nanoparticle-decorated iron nanotubes hosted in a polycarbonate porous membrane: development, characterization, and performance as electrocatalysts of ascorbic acid

Palladium nanoparticle-decorated iron nanotubes hosted in a polycarbonate porous membrane: development, characterization, and performance as electrocatalysts of ascorbic acid

Nanodiamond Tipped and Coated Conical Carbon Tubular Structures

Very High Density Sensing Arrays

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