Electrochemical Biosensors in Nonaqueous Solutions and Their Applications

Nakamura, Toshio

doi:10.2116/analsci.23.253

Cited by 6 publications

(3 citation statements)

References 63 publications

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“…11,12 Enhanced lateral chain-chain interaction between aromatic thiol molecules results in formation of highly compact rigid SAMs 13,14 and makes them excellent barriers against metal ion penetration in electrolytic media. 15 Properties of SAMs are often tuned by attaching functional termination groups on the molecular chain such as -SH, 16,17 -OH, 2,18 -COOH, 4,19 -SO 3 H, 20 -CN 20,21 and -NH 2 [22][23][24] for appropriate technical applications. A pyridine moiety as a functional group makes these films interesting for a variety of applications.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical investigations on stability and protonation behavior of pyridine-terminated aromatic self-assembled monolayers

Muglali

Bashir

Terfort

et al. 2011

Phys. Chem. Chem. Phys.

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Based on electrochemical methods such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), Au(111) electrodes modified by self-assembled monolayers (SAMs) of a homologous series of pyridine-terminated thiols with aromatic backbones have been investigated. An important correlation between the chain structure and film integrity in electrolytic media was found. Monolayers with odd numbers of methylene spacers in the molecular chain showed superior barrier properties compared to even numbered counterparts. A positive influence of an increase in the number of attached phenyl rings on the integrity of SAMs was observed. Furthermore, cathodic desorption of the investigated SAMs is characterized by multiwave desorption peaks and extraordinarily large cathodic charges indicating an unusual desorption process. Moreover, protonation behavior of the SAMs has been investigated by X-ray photoelectron spectroscopy (XPS) and electrochemical methods. Protonation has been found to be reversible and surface pK(a) values have been determined to be around 5 for all investigated monolayers.

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Section: Introductionmentioning

confidence: 99%

Electrochemical investigations on stability and protonation behavior of pyridine-terminated aromatic self-assembled monolayers

Muglali

Bashir

Terfort

et al. 2011

Phys. Chem. Chem. Phys.

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“…Thin films and monolayers of molecules adsorbed to surfaces have generated sustained interest due to applications in fields such as molecular and biomolecular recognition [1], corrosion protection [2] and patterning [3]. Alkanethiols are the most studied class of compounds for thin films on gold as they readily bind to the surface and the molecules may form ordered surface structures [4].…”

Section: Introductionmentioning

confidence: 99%

Thin films of ruthenium phthalocyanine complexes

et al. 2009

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Four new ruthenium phthalocyanine complexes bearing axial ligands with thioacetate groups that facilitate thin film formation on gold surfaces are presented. STM images and surface coverage data obtained by solution inductively coupled plasma mass spectrometry (ICP-MS) experiments show that peripheral and axial ligand substituents on the complexes have a significant effect on their surface coverage. A laser ablation ICP-MS technique is described here for the first time that provides information about thin films across macro-sized areas. Using the technique, the maximum surface coverage of a ruthenium phthalocyanine complex was found to occur within one minute of gold substrate immersion in the complex-containing solution.

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“…Molecular aggregates, such as micelles, vesicles, surface monolayers, and so forth, provide functional interfaces which enable the reactions and molecular recognitions that do not occur in bulk condensed phases. − These features come from the self-assembled nature of amphiphilic molecules and also from the confined space automatically formed through their aggregation. Molecular aggregates have been utilized for the preparation of nanomaterials and biomimetic systems, − the design of sensing devices, − catalytic reactions, and molecular separation. − The understanding of the phenomena occurring in these systems is not only of fundamental interest but also of essential importance for further exploitation of functional materials.…”

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confidence: 99%

Characterization of Bromide Ions in Charge-Stacked Zwitterionic Micellar Systems

2007

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A novel zwitterionic surfactant, N-dodecyl-N,N,N',N'-tetra-methyl-ethylene-di-ammonio-propane-sulfonate bromide (DEPB), has been synthesized, and Br(-) involved in the micellar system has been characterized by potentiometry, NMR, and X-ray absorption fine structure (XAFS). Although the dissociation degree of Br(-) from the micelle evaluated by potentiometry almost agrees with that determined by NMR, the former is significantly smaller than the latter over the entire range of concentrations of DEPB. This is explained by assuming that the bromide ions in the micellar system have several different peripheral structures. XAFS has given significant insight into the hydration structures of Br(-) involved in the system. Some of the bromide ions partitioned into the micelle are dehydrated and are directly bound by the ammonium groups in the DEP molecules. However, some of the bromide ions are still completely hydrated even when they are partitioned into the micelles. The average hydration number of the bromide ions directly bound by the ammonium groups was determined to be approximately 3.3. The partial dehydration of Br(-) is possibly facilitated by the characteristic hydration circumstances provided by the charge-stacked structure of the surfactant and by the resulting thick palisade layer of the DEP micelle.

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Electrochemical Biosensors in Nonaqueous Solutions and Their Applications

Cited by 6 publications

References 63 publications

Electrochemical investigations on stability and protonation behavior of pyridine-terminated aromatic self-assembled monolayers

Electrochemical investigations on stability and protonation behavior of pyridine-terminated aromatic self-assembled monolayers

Thin films of ruthenium phthalocyanine complexes

Characterization of Bromide Ions in Charge-Stacked Zwitterionic Micellar Systems

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