Electrochemical potentiometric sensing without reference electrode

US8801917B2 · kind B2 · utility

Assignee

• NXP B.V. · NL

Inventors

• Matthias Merz · Leuven, BE
• Youri Victorovitch Ponomarev · Leuven, BE
• Gilberto Curatola · Leuven, BE

Key dates

• Filing date: Aug 24, 2009
• Grant date: Aug 12, 2014
• Expiry date: Dec 14, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4145
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a method of determining a charged particle concentration in an analyte (100), the method comprising steps of: i) determining at least two measurement points of a surface-potential versus interface-temperature curve (c1, c2, c3, c4), wherein the interface temperature is obtained from a temperature difference between a first interface between a first ion-sensitive dielectric (Fsd) and the analyte (100) and a second interface between a second ion-sensitive dielectric (Ssd) and the analyte (100), and wherein the surface-potential is obtained from a potential difference between a first electrode (Fe) and a second electrode (Se) onto which said first ion-sensitive dielectric (Fsd) and said second ion-sensitive dielectric (Ssd) are respectively provided, And ii) calculating the charged particle concentration from locations of the at least two measurement points of said curve (c1, c2, c3, c4). This method, which still is a potentiometric electrochemical measurement, exploits the temperature dependency of a surface-potential of an ion-sensitive dielectric in an analyte. The invention further provides an electrochemical sensor for determining a charged particle conce…