Characterisation of porosity and sensor response times of sol–gel-derived thin films for oxygen sensor applications

McDonagh, Colette; Bowe, P; Mongey, K.F.; MacCraith, Brian D.

doi:10.1016/s0022-3093(02)01154-7

Cited by 124 publications

(102 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…19 The increase in the molar water:alkoxide ratio induced decreased the film thickness, shrinkage and pore volume of sol-gel films due to faster hydrolysis and condensation rates. 20 Films obtained with water:alkoxide ratios above 2.5 were blue in color (Fig. 2b), also presenting significant aggregation of the dry form.…”

Section: Optimization Of Thionine Sol-gel Film Preparationmentioning

confidence: 98%

A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)

2010

View full text Add to dashboard Cite

Section: Optimization Of Thionine Sol-gel Film Preparationmentioning

confidence: 98%

A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)

2010

View full text Add to dashboard Cite

“…This approach provides the preparation of more uniform, optically transparent, thin, and crack-free sol-gel films compared to the IL-free composites. 84,99 The addition of an IL reduced the interfacial energy and thereby decreased the capillary pressure in the "walls" of the gel pores exerted by the liquid inside the capillaries when drying. 84,99 Due to the reduced risk of a fracture, the sensor stability increased.…”

Section: ·1 Ionic Liquids As Solvents For the Synthesis Of Sensor Mamentioning

confidence: 99%

“…84,99 The addition of an IL reduced the interfacial energy and thereby decreased the capillary pressure in the "walls" of the gel pores exerted by the liquid inside the capillaries when drying. 84,99 Due to the reduced risk of a fracture, the sensor stability increased. The sol-gels with the embedded ruthenium complex tris(2,2′-bipyridyl)ruthenium(II) chloride, [Ru(bipy)3]Cl2 × 6H2O (Fig.…”

Section: ·1 Ionic Liquids As Solvents For the Synthesis Of Sensor Mamentioning

confidence: 99%

Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

et al. 2017

View full text Add to dashboard Cite

This paper reviews the primary literature reporting the use of ionic liquids (ILs) in optical sensing technologies. The optical chemical sensors that have been developed with the assistance of ILs are classified according to the type of resultant material. Key aspects of applying ILs in such sensors are revealed and discussed. They include using ILs as solvents for the synthesis of sensor matrix materials; additives in polymer matrices; matrix materials; modifiers of the surfaces; and multifunctional sensor components. The operational principles, design, texture, and analytical characteristics of the offered sensors for determining CO2, O2, metal ions, CN -, and various organic compounds are critically discussed. The key advantages and disadvantages of using ILs in optical sensing technologies are defined. Finally, the applicability of the described materials for chemical analysis is evaluated, and possibilities for their further modernization are outlined.

show abstract

“…[10][11][12][13] In addition, modifications of the BDD surface have been employed for a number of specific applications. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Thus, Duo et al 14 have studied the deposition of small quantities of IrO 2 clusters on the BDD surface by a thermal decomposition technique and observed that the oxygen evolution reaction (OER) was dramatically enhanced with the surface modification. De Battisti et al 15 have reported Sol-Gel modifications of the BDD surface with RuO 2 and IrO 2 and used chlorine evolution as a model reaction to evaluated the effect of RuO 2 modification on BDD films.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, Mattos-Costa et al 26 have constructed Ti/Ru x Ir 1-x O 2 electrodes to be used as anodes under extreme conditions and Suffredini et al 27 have prepared NiCo 2 O 4 coatings on Ni using the Sol-Gel method to produce an efficient material for oxygen evolution in alkaline media. Several other authors have prepared Sol-Gel films of Ga-Zn oxide 28 as well as tetraethoxysilane (TEOS) and methyltriethoxysilane (MTEOS)-based films 29 were prepared to be used as oxygen sensors while, for the first time, modified carbon powder electrodes were recently produced by the Sol-Gel method to be used as anodes in direct methanol fuel cells. 30 The aim of this work is to extend our previous findings on the Sol-Gel modification of the BDD surface 22 to different catalytic coatings such as metal oxides (MO 2 , M = Pb, Ru, and Ir) and analyze their surface topologies by atomic force microscopy (AFM) and electrochemical active area by comparative studies with a polycrystalline Pt electrode.…”

Section: Introductionmentioning

confidence: 99%

AFM studies and electrochemical characterization of boron-doped diamond surfaces modified with metal oxides by the Sol-Gel method

Suffredini¹,

Salazar‐Banda²,

Okamura³

et al. 2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Com o objetivo de aprofundar investigações anteriores, foram realizadas modificações superficiais diretas em eletrodos de diamante dopados com boro (DDB), com óxidos metálicos (PtO x , RuO 2 , IrO 2 e PbO 2 ) e com alguns compósitos mistos, utilizando a técnica Sol-Gel. Estes materiais foram estudados por microscopia de força atômica (MFA) e os resultados indicaram a formação de sítios de deposição heterogênea. Técnicas eletroquímicas foram utilizadas para estabelecer a atividade catalítica para a reação de desprendimento de oxigênio (RDO) e para reação de oxidação de etanol em meio ácido utilizando os compósitos de PtO x e PtO x -RuO 2 . Testou-se ainda a estabilidade de um depósito de PtO x , recoberto por um filme de Nafion ® , por meio de operação contínua de longa duração. Estudos de voltametria cíclica comparativa mostraram que a área superficial ativa dos novos materiais mudou consideravelmente com o método de modificação proposto. O eletrodo de IrO 2 /BDD mostrou o melhor desempenho para a RDO, iniciando o processo de oxidação em ~ 1.4 V vs. HESS, valor este 200 mV menor do que o observado sobre um eletrodo de PtO x /BDD. Foi observada uma pequena perda da atividade do eletrodo de PtO x /BDD (6%) depois de realizada eletrólise de 4 horas, enquanto que 1000 ciclos voltamétricos deixaram a superfície praticamente inalterada. Os estudos realizados mostram que as atividades satisfatórias dos eletrodos preparados pelo método Sol-Gel podem constituir ferramentas interessantes de pesquisa, visando principalmente a utilização destes materiais em aplicações práticas.Continuing previous investigations, direct surface modifications of boron-doped diamond (BDD) electrodes with metal oxides (PtO x , RuO 2 , IrO 2 and PbO 2 ) and with some mixed composites were carried out by the Sol-Gel technique. The materials were studied by atomic force microscopy (AFM) to determine their surface topologies and by electrochemical techniques to establish the catalytic activity towards the oxygen evolution reaction (OER) and also, for the PtO x and PtO xRuO 2 composites, the ethanol oxidation reactions in acid media. The stability of PtO x coating covered by a Nafion ® film was also tested by long-term operation. The AFM results indicated sites of heterogeneous deposition and the electrochemical studies demonstrated that the active surface area changed considerably with the proposed method of modification. The IrO 2 /BDD electrode showed the best performance to the OER with the onset of the oxidation current at ~1.4 V, a value 200 mV lower than for the PtO x /BDD electrode. The enhanced stability of PtO x /BDD electrodes achieved by the application of a Nafion ® film and already reported in acid media was further proved using the ethanol oxidation reaction. Only a small loss of activity (6%) was observed after 4-hours electrolysis while one-thousand voltammetric cycles left the surface practically unchanged. In addition, preliminary studies for the same reaction on PtO x /BDD and PtO x -RuO 2 / BDD electrodes demonstrated the excell...

show abstract

Characterisation of porosity and sensor response times of sol–gel-derived thin films for oxygen sensor applications

Cited by 124 publications

References 21 publications

A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)

A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)

Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

AFM studies and electrochemical characterization of boron-doped diamond surfaces modified with metal oxides by the Sol-Gel method

Contact Info

Product

Resources

About