Sol-Gel-Derived Ceramic-Carbon Composite Electrodes: Introduction and Scope of Applications

Tsionsky, Michael; Gun, Genia.; Glezer, Victor; Lev, Ovadia

doi:10.1021/ac00082a024

Cited by 394 publications

(230 citation statements)

References 23 publications

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“…The CCEs have been demonstrated to be very useful for electrochemical investigations e.g., biosensors, electroanalysis and electrocatalysis fields, energy conversion and storage. [27][28][29][30] Decrease in the magnitude of the operating potential can dramatically enhance the performance of electrochemical sensors and detectors. Electrocatalytic modified electrodes have been widely used for improving the sensitivity and selectivity of electroanalytical measurements of numerous analytes.…”

Section: Introductionmentioning

confidence: 99%

Determination of Imidacloprid in Tomato Grown in Greenhouse Based on Copper(II) Phthalocyanine Modified Carbon Ceramic Electrode by Differential Pulse Voltammetry

Majidi

Asadpour‐Zeynali

Bamorowat

et al. 2011

J Chinese Chemical Soc

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A new sol-gel derived electrocatalytic carbon ceramic electrode was prepared by incorporating copper(II) phthalocyanine (CuPc) in a carbon ceramic network. This electrode was used as a sensitive electrochemical sensor for determination of the insecticide Imidacloprid (1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine) by differential pulse voltammetry (DPV). The resulting modified electrode exhibits a cathodic peak potential shifted positively and an increasing in cathodic peak current in comparison with unmodified electrode. The redox properties of this modified electrode at various pH values and CuPc percentage were investigated. The catalytic current obtained from differential pulse voltammetry is linearly dependent on Imidacloprid concentration over the two linear ranges of 0.67-17 µM and 17-93 µM with correlation coefficient of R 2 = 0.9999 and R 2 = 0.990, respectively. The detection limit for Imidacloprid was found to be 0.28 mM according to lower linear range. Possible interferences from several common pesticides were also evaluated. The inherent stability, high sensitivity, low detection limit and low cost for each preparation are advantages of this sensor. Determination of Imidacloprid in commercial formulation and residual Imidacloprid in tomato grown in greenhouse (protected cultivation) was also conducted. The results obtained from commercial formulation were completely consistent with those obtained through the standard high-performance liquid chromatography (HPLC) method.

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Section: Introductionmentioning

confidence: 99%

Determination of Imidacloprid in Tomato Grown in Greenhouse Based on Copper(II) Phthalocyanine Modified Carbon Ceramic Electrode by Differential Pulse Voltammetry

Majidi

Asadpour‐Zeynali

Bamorowat

et al. 2011

J Chinese Chemical Soc

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“…[1][2][3][4][5] Os primeiros eletrodos obtidos através dessa técnica foram propostos pelo grupo de Lev e colaboradores e desde então têm sido aplicados na determinação de diversas espécies de interesse farmacológico e ambiental. 6 Existem inúmeras vantagens destes materiais em relação aos demais eletrodos à base de carbono, sendo que a principal delas consiste na combinação das propriedades do processo sol-gel (tal como alta área superficial) e a condutividade dos materiais de carbono, possibilitando a obtenção de um eletrodo de superfície renovável similar ao eletrodo de pasta de carbono, porém mais robusto e de maior estabilidade. [7][8][9][10][11] O método de preparação do eletrodo de carbono cerâmico influencia diretamente nas suas propriedades condutoras, mecânicas e morfológicas, sendo estas refletidas na resposta eletroquímica do eletrodo.…”

Section: Introductionunclassified

Otimizaçâo das condições de preparação de eletrodos à base de carbono cerâmico utilizando-se planejamento fatorial

Skeika¹,

Pessôa²,

Fujiwara³

et al. 2010

Quím. Nova

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Recebido em 28/4/09; aceito em 13/10/09; publicado na web em 11/3/10 OPTIMIZATION OF ELECTRODES CONDITIONS PREPARATION BASED CARBON CERAMIC USING FACTORIAL DESIGN. Different parameters of carbon ceramic electrodes (CCE) preparation, such as type of precursor, carbon material, catalyst amount, among others, significantly influence the morphological properties and consequently their electrochemical responses. This paper describes a 2 3 factorial design (2 factors and 3 levels with central point replicates), which the factors analyzed were catalyst amount (HCl 12 mol L -1 ), graphite/precursor ratio, and precursor type (TEOS -tetraethoxysilane and MTMOSmethyltrimetoxysilane). The design resulted in a significant third order interaction for peak current values (Ipa) and a second order interaction for potential difference (DE), between thefactors studied, which could not be observed when using an univariated study.Keywords: carbon ceramic electrodes; cyclic voltammetry; factorial design. INTRODUÇÃORecentemente tem havido um crescente interesse no estudo de uma nova geração de materiais que apresentam alta condutividade elétrica, os chamados eletrodos de carbono cerâmico (ECC), os quais são basicamente obtidos através da dopagem da matriz de sílica obtida pelo método sol-gel com o pó de carbono ou grafite. [1][2][3][4][5] Os primeiros eletrodos obtidos através dessa técnica foram propostos pelo grupo de Lev e colaboradores e desde então têm sido aplicados na determinação de diversas espécies de interesse farmacológico e ambiental. 6 Existem inúmeras vantagens destes materiais em relação aos demais eletrodos à base de carbono, sendo que a principal delas consiste na combinação das propriedades do processo sol-gel (tal como alta área superficial) e a condutividade dos materiais de carbono, possibilitando a obtenção de um eletrodo de superfície renovável similar ao eletrodo de pasta de carbono, porém mais robusto e de maior estabilidade. 7-11O método de preparação do eletrodo de carbono cerâmico influencia diretamente nas suas propriedades condutoras, mecânicas e morfológicas, sendo estas refletidas na resposta eletroquímica do eletrodo. A maior parte das diferentes configurações de eletrodos de carbono cerâmico descritas na literatura utiliza precursores hidrofóbicos, em particular o metiltrimetoxissilano, para a construção de sensores eletroquímicos.12-20 Tal característica pode ser explicada devido ao aumento da hidrofobicidade da interfase eletrodo-solução, possibilitando que somente poucas partículas de carbono na superfície do eletrodo fiquem em contato com o eletrólito. Esta configuração minimiza a corrente de fundo, a qual é proporcional à superfície condutora do eletrodo, aumentando a sensibilidade do mesmo.10 Por outro lado, a obtenção de um eletrodo compósito hidrofílico é menos empregada, permitindo a construção de um eletrodo permeável a soluções aquosas. 15O tipo de material de carbono é considerado outro fator que influencia na resposta dos ECC, em particular na sua condutividade e propriedades mecânicas. ...

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“…13 In addition, the immobilization material can be optimized so that transparent monoliths, thin films or fine particles, are formed depending on the ultimate application of the preparation. [14][15][16][17] Braun 18 suggested that the encapsulation of glucose oxidase in a tetramethoxysilane sol-gel matrix was good for the determination of glucose. Sol-gel technology has also been used for encapsulating proteins, cells, microbe and immunoreagents.…”

Section: Introductionmentioning

confidence: 99%

Bacteria-modified Amperometric Immunosensor for a Brucella melitensis Antibody Assay

Gong

Shen

et al. 2002

ANAL. SCI.

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Brucellosis is an infectious disease that spreads easily between animals and even human beings. There is a critical fact that once a flock of livestocks is infected by Brucella, the prevalent brucellosis would cause over half of the infected pregnant ones to abort. 1 A sensitive and simple detection of Brucella antibody is essential in clinic and veterinary diagnosis. Some traditional diagnostic procedures, such as bacterioscopy (BS), agglutination test (AT), complement fixation test (CFT), precipitation reaction test (PRT), SPA-co-agglutination test (SCAT), enzyme-linked immunosorbent assay (ELISA), radio immunoassay (RIA) and indirect fluorescent antibody (IFAT) test, have been employed in clinical analysis. 2 However, some of these approaches are rather time-consuming or requiring highly qualified personnel; others depend on sophisticated instrumentation. Moreover, most of these procedures are only adapted for the qualitative or semiquantitative detection for Brucella assays. To obtain satisfactory results, most of the diagnostic procedures have to be coupled with another independent test; otherwise, a part of the infected samples may escape the screening test. Developing new, simple and more sensitive quantitative diagnosis methods has attracted the considerable interest.Electrochemical immunosensors are robust tools of immunoanalytical means that have been the subject of continued research and development in recent years. These methods generally involve the production or use of an electrochemical active substance for signal generation.Immunoenzymatic sensors involving the enzyme label and the specificity of an antigen-antibody binding have an effect of chemical amplification and relatively high selectivity. The advantages of electrochemical immunosensors include speed, accuracy, selectivity and sensitivity. paraffin, 6 nafion, 7 chitosan, 8 were used as a matrix material to prepare immunosensors. They are mostly organic polymers, which tend to swell when dipped into a solvent, leading to a shift of the response signal. The activity of biomolecules in these materials used for immobilization decreases appreciably and the immobilized biomolecules do not retain their activity over a long time period. Recently, in the so-called sol-gel process, some biomaterials were trapped into a silicate glass matrix under mild conditions. [10][11][12] Biomolecules show considerable retention of their activity in such immobilization matrices. The other outstanding feature of such a process is that small substrate molecules can diffuse into the pores of the polymeric silica matrix and reach the site of the bioreagent. The Sol-Gel process for biomolecules immobilization seems to be very promising, especially due to the mild conditions that are used for the immobilization process as well as the simplicity of the procedure involved. 13In addition, the immobilization material can be optimized so that transparent monoliths, thin films or fine particles, are formed depending on the ultimate application of the preparation. 14-17 Brau...

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Sol-Gel-Derived Ceramic-Carbon Composite Electrodes: Introduction and Scope of Applications

Cited by 394 publications

References 23 publications

Determination of Imidacloprid in Tomato Grown in Greenhouse Based on Copper(II) Phthalocyanine Modified Carbon Ceramic Electrode by Differential Pulse Voltammetry

Determination of Imidacloprid in Tomato Grown in Greenhouse Based on Copper(II) Phthalocyanine Modified Carbon Ceramic Electrode by Differential Pulse Voltammetry

Otimizaçâo das condições de preparação de eletrodos à base de carbono cerâmico utilizando-se planejamento fatorial

Bacteria-modified Amperometric Immunosensor for a Brucella melitensis Antibody Assay

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