Immobilised reagents for optical heavy metal ions sensing

Malcik, N.; Oktar, O.; Ozser, Mustafa E.; Caglar, Perihan; Bushby, Lisa M.; Vaughan, Andrew A.; Kuswandi, Bambang; Narayanaswamy, Ramaier

doi:10.1016/s0925-4005(99)00004-0

Cited by 60 publications

(22 citation statements)

References 12 publications

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“…Classical indicators such as dithizone [1], xylenol orange [2], 1-(2-pyridyl-azo)-2-naphthol [3], and 4-(2-pyridylazo) resorcinol [4] have been used in the development of optodes which were successfully applied to fabricate metal ion sensors. There is a growing interest in the development of new sensing materials and the immobilization method to obtain sensors with improved characteristics.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of silica monolith doped with meso-tetra(p-carboxyphenyl)porphyrin as a novel metal ion sensor

Buntem

Intasiri

Lueangchaichaweng

2010

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of silica monolith doped with meso-tetra(p-carboxyphenyl)porphyrin as a novel metal ion sensor

Buntem

Intasiri

Lueangchaichaweng

2010

Journal of Colloid and Interface Science

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“…One aspect of water quality with particular importance is the determination of heavy metal ion concentrations. In high doses, heavy metals are toxic and can cause damage to the central nervous system resulting in various neuropsychiatric disorders [2,3]. For this reason government organisations typically enforce strict regulations over the allowed concentration of heavy metal ions in potable water supplies.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Detection of Copper Using a Gly-Gly-His Modified Carbon Nanotube Biosensor

Flavel

Nambiar

Shapter

2011

Silicon

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Diazonium ion chemistry has been used to electrochemically graft aminophenyl layers onto p-type silicon (100) substrates. A condensation reaction was used to immobilise single-walled carbon nanotubes with high carboxylic acid functionality directly to this layer. The surface immobilised carbon nanotubes were then modified with the tripeptide Gly-Gly-His for the selective detection of copper ions in aqueous environments. The stepwise assembly and sensitivity of this biosensor to copper was characterised by X-ray photoelectron spectroscopy and differential pulse voltammetry, respectively. The ability to detect copper ion concentrations down to 1 μM was demonstrated. As this biosensor combines the advantages of a silicon substrate for easy integration into sophisticated electrical and electronic devices, diazonium salt derived films for stability in aqueous environments and carbon nanotubes for desirable electrochemical properties, it is expected to have important future applications in environmental sensing.

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“…The key components in this sensing method are optical sensors that are highly stable and can efficiently detect toxic ions in terms of sensitivity and selectivity with real-time monitoring; such features are currently required to analyze today's ultra-trace levels of environmental pollutants (Lee et al 2007;Umemura et al 2006;Ros-Lis et al 2005). Optical sensors for Co(II) ion detection have successfully emerged using chromophores-and fluorophores-functionalized polymers (Yang et al 2002;Malcik et al 1998) but they were normally associated with certain limitations such as, tedious synthesis, complicated analysis, delayed signal response, insufficient selectivity and low sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Functionalized hexagonal mesoporous silica monoliths with hydrophobic azo-chromophore for enhanced Co(II) ion monitoring

El‐Safty

2009

Adsorption

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We introduce here new optical strips for the colorimetric monitoring of Co(II) ions in an aqueous solution. The optical nanosensors were designed by direct immobilizing azo-chromophore with long hydrophobic tails onto hexagonal mesoporous silica monoliths (HOM-2). Although, azo-dye probe was used as signaling reporter for selective detection of the Co(II) analyte up to 10 −6 mol/dm 3 in solution, the tailoring of the Co(II) ion-sensing functionality was successfully manipulated up to 10 −9 mol/dm 3 with the incorporation of azo-chromophore into hexagonal mesoporous silica monoliths (HOM-2), which led to small, easy-to-use optical sensor strips. However, our simple design of colorimetric sensors is based on a physical adsorption of chemically responsive dyes onto HOM materials followed by stronger dye-analyte interactions in aqueous sensing systems. No elution of the probe molecules was evident with the addition of Co(II) analyte ions during the sensing process. The binding of Co(II) ions with probes led to the color change of nanosensors corresponding to the formation of the metal-chelate [Co(II)-Probe] n+ complexes. Results indicated that hexagonal nanosensors offer one-step and simple sensing procedures for both quantification and visual detection of Co(II) ions without the need for sophisticated instruments. However, the solid HOM-2 materials immobilized by the these indicator dyes, in principle, could be used as preconcentrators to yield high adsorption capacity and preconcentration efficiency, leading to simultaneThis special Festschrift for Professor Jaroniec.ously visual inspection and simple detection over a wide, adjustable range of Co(II) ions even at trace levels. For Co(II) ion selectivity assays, negligible changes in either the developed color or the reflectance intensities of the [Co-Probe] n+ complex were observed, despite the addition of competitive cations. Moreover, the hexagonal nanosensors are reversible and have the efficient potential to serve for multiple analyses.Hexagonal optical strips for the colorimetric monitoring of Co(II) ions in an aqueous solution was successfully fabricated. This strip enabled to create ion-sensitive responses with revisable, selective and sensitive recognitions of a wide range of detectable Co(II) ions down to sub-nanomolar (∼15 × 10 −9 M) in rapid sensing responses (in the order of minutes)

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Immobilised reagents for optical heavy metal ions sensing

Cited by 60 publications

References 12 publications

Facile synthesis of silica monolith doped with meso-tetra(p-carboxyphenyl)porphyrin as a novel metal ion sensor

Facile synthesis of silica monolith doped with meso-tetra(p-carboxyphenyl)porphyrin as a novel metal ion sensor

Electrochemical Detection of Copper Using a Gly-Gly-His Modified Carbon Nanotube Biosensor

Functionalized hexagonal mesoporous silica monoliths with hydrophobic azo-chromophore for enhanced Co(II) ion monitoring

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