Ion-selective membrane chemically bound to a field-effect transistor

Battilotti, M.; Colilli, R.; Giannini, Iacopo; Giongo, M.

doi:10.1016/0250-6874(89)80082-4

Cited by 19 publications

(5 citation statements)

References 7 publications

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“…Several approaches have been proposed to solve such problems including chemical anchoring of PVC membranes containing OH groups to an oxide surface via cross-linking with SiCl 4 [9,10], chemical attachment of sensing membranes to solid surfaces [11][12][13][14][15], use of graphite-epoxy as an internal reference [16], use of adhesive polymer matrices other than PVC [4,5,10,[17][18][19][20] or modifying the oxide surface by means of ion implantation [21].…”

Section: Introductionmentioning

confidence: 99%

All-solid-state hydrogen sensing microelectrodes based on novel PPy[3,3′-Co(1,2-C2B9H11)2] as a solid internal contact

Zine

Bausells

Teixidor

et al. 2006

Materials Science and Engineering: C

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Section: Introductionmentioning

confidence: 99%

All-solid-state hydrogen sensing microelectrodes based on novel PPy[3,3′-Co(1,2-C2B9H11)2] as a solid internal contact

Zine

Bausells

Teixidor

et al. 2006

Materials Science and Engineering: C

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“…Ion-selective electrodes (ISEs) based on plasticized poly(vinyl chloride) (PVC) membranes doped with neutral carriers are now routinely used for the determination of potassium, sodium, calcium, chloride, and carbonate ions in blood, urine, and other physiological fluids. − However, the use of PVC-based membranes in all-solid-state ion sensors [e.g., coated-wire electrodes (CWEs) and ion-selective field effect transistors (ISFETs)] resulted in limited success because of their inherently weak adhesion to most solid surfaces. Several alternative methods have been proposed to solve such problems: some examples include the modification of the PVC matrix for binding to hydroxyl-bearing solid surfaces, − mechanical fastening of the membranes, chemical attachment of sensing membranes to solid surfaces, − and use of adhesive polymer matrices other than PVC. − In many cases, however, those methods, even if they improve membrane adhesion and lifetime, were hardly practical, as they are too sophisticated to be employed for mass fabrication or result in poor electrochemical performance. Thus, design of solvent polymeric ion sensing membranes that are easily applicable on any all-solid-state device without compromising their potentiometric performance is a prerequisite in developing microfabricated ion-selective sensor arrays.…”

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confidence: 99%

One-Component Room Temperature Vulcanizing-Type Silicone Rubber-Based Calcium-Selective Electrodes

Kim

Lee

et al. 1996

Anal. Chem.

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New calcium-selective membranes for all-solid-state ion sensors are developed with a highly adhesive one-component room temperature vulcanizing-type silicone rubber (RTV-1-type SR) matrix. The membranes are formulated with 21.6 wt % bis(2-ethylhexyl) adipate, 0.3 wt % tetradodecylammonium tetrakis(p-chlorophenyl)borate (ETH 500), 0.1 wt % potassium tetrakis(p-chlorophenyl)borate, and 0.8 wt % calcium-selective neutral carrier ETH 129 or ETH 1001. Plasticizer added to the RTV-1-type SR matrix not only decreases the bulk membrane resistance but also increases the solubility of electroactive components incorporated in the membrane without significantly deteriorating its adhesive strength. It is found that the lipophilic salt ETH 500 remarkably enhances the calcium selectivity of ETH 129 or ETH 1001 ligands in the SR matrix; the selectivity coefficients ([Formula: see text] by separate solution method, where j = Li(+), Na(+), K(+), or Mg(2+)) for the optimized membranes were below 10(-5). Potentiometric characteristics of planar-type Ag electrodes coated with optimized RTV-1-type SR membranes, e.g., response slope 29.0 ± 0.5 mV/decade, detection limit below 5.0 × 10(-7) M a(Ca)((2+)), and 2-3 mV of potential drift per day, were virtually the same as those of the corresponding poly(vinyl chloride) membrane-based conventional electrodes, but with greatly enhanced sensor-to-sensor reproducibility and lifetime (3-9 weeks).

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“…The second type of ISFET make use of ISMs as sensing element [2], [7], [8], [47]. These are placed between the gate oxide and the electrolyte solution as sketched in Fig.…”

Section: B Ism-based Isfetsmentioning

confidence: 99%

“…1.b) preventing physical transfer of ions, so that ion-transfer processes can only occur between the ISM and the sample solution. Here, the membrane potential can be recorded directly at the solid interface, e.g., through ion-to-electronic conversion, such as in solid-contact ionselective electrodes (SC-ISEs) [2], [6], or used for field-effect modulation of an electric current, as in ion-sensitive FETs (ISFETs) [1], [7], [8]. Note that in ISFETs employing ISMs, the sensing mechanism is ruled by ion-transfer across the membrane and the electrolyte rather than surface reactions at the solid/electrolyte interface (e.g., site-binding model for oxide/electrolyte interface at the base of pH sensing [9]).…”

Section: Introductionmentioning

confidence: 99%

Modeling Non-Equilibrium Ion-Transport in Ion-Selective-Membrane/Electrolyte Interfaces for Electrochemical Potentiometric Sensors

2022

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We present an approach to simulate ion's drift and diffusion in chemical sensors based on ion-selective-membranes (ISMs) in either ion-selective electrode structures or coupled to field-effect transistors. The model is used to analyze the sensitivity, selectivity, and transient response of ISMs in non-equilibrium conditions upon real-time concentration changes. Our simple implementation combines advanced features from semiconductor theory and analytical electrochemistry, such as the Schafetter-Gummel discretization scheme and Chang-Jaff é boundary conditions for ions at the interfaces, thus allowing to perform simulations beyond sensing. The results are in agreement with experimental transient responses reported in the literature.As relevant case studies, we examine the ISM preconditioning in miniaturized sensors and the electrostatic interaction between the FET channel and ISMs. In the first case, simulations reveal that calibration curves performed on incomplete ISM conditioning can lead to hysteretical responses when the ion affinity in the electrolyte and ISM is similar (e.g., with organic ions). In the second case, we find that the gate oxide field in contact with the ISM affects the device characteristics such that the ion concentrations not only change the FET threshold voltage but also the slope of its IV curve. This effect can be minimized by working in the subthreshold regime or using extended gates.

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Ion-selective membrane chemically bound to a field-effect transistor

Cited by 19 publications

References 7 publications

All-solid-state hydrogen sensing microelectrodes based on novel PPy[3,3′-Co(1,2-C2B9H11)2] as a solid internal contact

All-solid-state hydrogen sensing microelectrodes based on novel PPy[3,3′-Co(1,2-C2B9H11)2] as a solid internal contact

One-Component Room Temperature Vulcanizing-Type Silicone Rubber-Based Calcium-Selective Electrodes

Modeling Non-Equilibrium Ion-Transport in Ion-Selective-Membrane/Electrolyte Interfaces for Electrochemical Potentiometric Sensors

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