Solid Contact Electrochemical Sensor (20140304, Dr. Philippe Buhlmann)

Technology No. 20140304
IP Status: Issued US Patent; Application #: 14/716,564

Low-cost Ion Selective Electrode with Solid Contact

A new type of solid-contact ion-selective electrode (ISE) introduces low-cost colloid-imprinted mesoporous (CIM) carbon material as the solid contact. The CIM carbon, which is inexpensive and easy to manufacture, acts as an intermediate layer between a gold electrode and an ionophore-doped ISE membrane. The CIM carbon’s open and interconnected pore texture offers significantly higher capacitance than current technology.

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Electrochemical Sensor Requires Little Calibration

The new sensor requires minimal calibration. This benefit is due to a redox couple incorporated into the ISE, yielding a standard deviation of E° as low as 0.7 mV. In addition, the CIM carbon’s high purity, hydrophobic characteristics and low number of redox-active functional groups give the ISE excellent potential stability and resistance to light, oxygen, carbon dioxide and water interference.


  • Requires minimal calibration
  • Excellent resistance to interference from light, oxygen, carbon dioxide and water
  • Long-term stability and excellent reproducibility
  • Colloid-imprinted mesoporous (CIM) carbon is inexpensive and easy to manufacture
  • Open and interconnected CIM carbon pore structure leads to higher capacitance

Phase of Development - Prototype Development

Philippe Buhlmann, PhD
Professor, Chemistry, College of Science and Engineering
External Link (
Andreas Stein, PhD
Professor, Chemistry, College of Science and Engineering
External Link (

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