Electrochemical Sensors

Bakker, Eric; Telting-Diaz, Martin

doi:10.1021/ac0202278

Cited by 561 publications

(339 citation statements)

References 241 publications

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“…Over the years, covalent attachment of sensing components emerged as an attractive solution for the problem of their insufficient retention. 23 We have earlier demonstrated that modified SP can be attached to activated polymethylmethacryllic (PMMA)-based surface binding sites with full preservation of the ability of SP to switch between the active and passive form and detection of Co 2+ while in active form. 16 In light of our attempts for simplification of sensing platform, it is important to note that the switching can be achieved using simple LEDs.…”

Section: Discussionmentioning

confidence: 99%

Spiropyran-based reversible, light-modulated sensing with reduced photofatigue

Radu

Byrne

Alhashimy

et al. 2009

Journal of Photochemistry and Photobiology A: Chemistry

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Switchable materials have tremendous potential for application in sensor development that could be applied to many fields. We are focusing on emerging area of wireless sensor networks due to the potential impact of this concept in society. Spiropyran-based sensors are probably the most studied type of photoswitchable sensing devices. They suffer from many issues but photofatigue, insufficient selectivity and lack of sensitivity are probably the most important characteristics that hinder their wider application. Here, we are address these issues and demonstrate that covalent attachment of modified spiropyran into a polymeric film significantly reduces photodegradation. The observed signal loss after 12 th cycle of switching between the spiropyran and merocyanine forms is only about 27% compared to the loss of 57% of the initial signal in an equivalent experiment based on nonimmobilized spiropyran. This has enabled us to demonstrate at least 5 reversible cycles of detection of an ion of interest (in our case H + ) with minimal signal loss. Furthermore, we demonstrate that the sensitivity can be increased by incorporation of additional binding groups in the parent spiropyran molecule. Using molecular modeling to calculate the relevant bond lengths as a measure of interaction between MC and H + , the calculated increase of H-bond strength is approximately an order of magnitude for a derivative containing a methoxy group incorporated in the o-position of the parent spiropyran in comparison to the equivalent unsubstituted phenol. This theoretical result was found to correspond very well with experimental observation. As a result, we have increased the sensitivity to H + by approximately one order of magnitude.3

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Section: Discussionmentioning

confidence: 99%

Spiropyran-based reversible, light-modulated sensing with reduced photofatigue

Radu

Byrne

Alhashimy

et al. 2009

Journal of Photochemistry and Photobiology A: Chemistry

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“…The measurement of potential value of the system is conducted on zero current condition. 1,2 This method can measure very low ionic concentrations that is in 10 −10 M or in parts per trillion (ppt). 3 According to International Union of Pure and Applied Chemistry (IUPAC), potentiometric analysis measures the potential difference that occurs between the working and reference electrodes, which is directly proportional to the logarithm of the concentration of ions.…”

Section: Introductionmentioning

confidence: 99%

Development of Solid-state Reference Electrode Based on Sodium Polyanethol Sulfonate Immobilised on Cellulose Acetate

Alva¹,

Aziz²,

Syono³

et al. 2017

JPS

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“…1 The ISE responds to the activity (concentration) of the sensed ion in the tested solution. 2,3 The potentiometric liquid membrane for the ISE includes an ionophore that captures a specific ion more tightly than other ions. Aza-crown ethers as ionophores of ISEs have attracted much attention due to their facile design as analytical reagents for the target ions.…”

Section: Introductionmentioning

confidence: 99%