Sol–gel–xerogel evolution investigated by electroactive probes in silica and transition-metal oxide based gels

Audebert, Pierre; Griesmar, Pascal; Hapiot, Philippe; Sánchez, Clément

doi:10.1039/jm9920201293

Cited by 51 publications

(32 citation statements)

References 19 publications

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“…Although the gel is macroscopically rigid, it is microscopically porous and hydrated. 19,20 Prior work has shown the diffusion coefficients of redox molecules trapped with these solids during the initial stages of drying to be nearly identical to values measured in solution (10 26 cm 2 s 21 ). 19,20 Corresponding ECL-potential curves for these materials are shown in Fig.…”

mentioning

confidence: 72%

Solid-state electrogenerated chemiluminescence in sol–gel derived monoliths

Collinson¹,

Martin²

1999

Chem. Commun.

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mentioning

confidence: 72%

Solid-state electrogenerated chemiluminescence in sol–gel derived monoliths

Collinson¹,

Martin²

1999

Chem. Commun.

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“…They observed that the diffusion of the analyte, and hence, its electrochemical response, was dependent upon the degree of cross-linking of the inorganic polymer. Other free redox species or reactive redox monomers (based on methylviologen or ferrocene derivatives) were used in connection to electrochemical techniques to probe transitions during sol-gel processing [194,195]. It was also found that the fraction of water within the gel did not affect the peak currents over a 1000-min time window, making materials prepared by sol-gel chemistry promising alternatives to organic ionomers as solid electrolytes for amperometric sensors [27].…”

Section: Sol-gel-derived Silicatesmentioning

confidence: 99%

Analytical Applications of Silica-Modified Electrodes -A Comprehensive Review

Walcarius

1999

Electroanalysis

148

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This article aims to review the electroanalytical applications of chemically modified electrodes involving silica and silica-containing matrices. After a brief introduction to silica chemistry, the implication of pure and grafted silicas in electrochemistry, as well as that of the silica-based materials originating from the sol-gel technology, will be discussed. The interest of silica-modified electrodes (SiO 2 -MEs) with respect to electroanalysis will be pointed out by means of several examples. In the last five years, successful applications of SiO 2 -MEs have been achieved. Among them, silica grafted with inorganic films or organic moieties was successfully applied to the selective preconcentration or the electrocatalytic detection of various analytes. Also, the ability of the sol-gel chemistry to encapsulate enzymes within a silica matrix without preventing its activity was exploited in the development of new amperometric biosensors. These promising fields are thought to lead to significant advances in the near future, because of the explosive growth in both the synthesis of novel mesoporous organically-modified silica-based materials and the huge development of sol-gel chemistry in tailoring and construction of new modified electrodes.

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“…The first examples of silica-based hybrid redox polymers are based on ferrocene-functionalized sol-gel materials [134,185,186,187]. In general, such materials exhibit moderately fast electron transfer kinetics.…”

Section: Redox-active Silica-based Organic-inorganic Hybridsmentioning

confidence: 99%

Mesoporous Silica-Based Materials for Electronics-Oriented Applications

et al. 2019

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Electronics, and nanoelectronics in particular, represent one of the most promising branches of technology. The search for novel and more efficient materials seems to be natural here. Thus far, silicon-based devices have been monopolizing this domain. Indeed, it is justified since it allows for significant miniaturization of electronic elements by their densification in integrated circuits. Nevertheless, silicon has some restrictions. Since this material is applied in the bulk form, the miniaturization limit seems to be already reached. Moreover, smaller silicon-based elements (mainly processors) need much more energy and generate significantly more heat than their larger counterparts. In our opinion, the future belongs to nanostructured materials where a proper structure is obtained by means of bottom-up nanotechnology. A great example of a material utilizing nanostructuring is mesoporous silica, which, due to its outstanding properties, can find numerous applications in electronic devices. This focused review is devoted to the application of porous silica-based materials in electronics. We guide the reader through the development and most crucial findings of porous silica from its first synthesis in 1992 to the present. The article describes constant struggle of researchers to find better solutions to supercapacitors, lower the k value or redox-active hybrids while maintaining robust mechanical properties. Finally, the last section refers to ultra-modern applications of silica such as molecular artificial neural networks or super-dense magnetic memory storage.

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Sol–gel–xerogel evolution investigated by electroactive probes in silica and transition-metal oxide based gels

Cited by 51 publications

References 19 publications

Solid-state electrogenerated chemiluminescence in sol–gel derived monoliths

Solid-state electrogenerated chemiluminescence in sol–gel derived monoliths

Analytical Applications of Silica-Modified Electrodes -A Comprehensive Review

Mesoporous Silica-Based Materials for Electronics-Oriented Applications

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