A screen-printed electrode (SPE) is a small, flat, usually disposable electrochemical cell. Conductive inks are printed through a patterned mesh onto a ceramic or plastic strip, giving a complete set of electrodes that needs only a drop of sample and a potentiostat. SPEs have made electrochemical measurements cheaper, faster and portable.
The three-electrode layout
- Working electrode – where the reaction of interest takes place. It is most often carbon, but gold, platinum and other materials are also printed.
- Counter (auxiliary) electrode – completes the circuit.
- Reference electrode – provides a stable potential; on SPEs it is usually silver or silver/silver chloride.
An insulating (dielectric) layer defines the active area and protects the conductive tracks that lead to the connector.
How SPEs are made
Each layer is printed in turn with a dedicated ink or paste: carbon or metal for the working and counter electrodes, silver or silver/silver chloride for the reference electrode and tracks, and a dielectric paste for the insulation. Each layer is dried or cured before the next is printed. The same inks can be used to print custom electrode designs; see screen print inks and pastes and conductive pastes.
Advantages
- Small sample volume, typically a single drop
- Disposable, which avoids polishing and cross-contamination
- Low cost per measurement and consistent geometry
- Portable when paired with a handheld potentiostat
- Easy to modify with nanomaterials, enzymes or antibodies
Typical applications
- Biosensors; blood glucose test strips are the best-known example of screen-printed sensor technology
- Trace heavy-metal detection by stripping voltammetry
- Environmental, food and water analysis
- Teaching and method development in electrochemistry
Modifying the working electrode
Sensitivity and selectivity are often improved by coating the working electrode with nanomaterials such as graphene, carbon nanotubes or metal nanoparticles before adding the recognition element.
Selection checklist
- Working electrode material and diameter
- Reference electrode type (silver or silver/silver chloride)
- Substrate (ceramic or plastic) and overall strip dimensions
- Connector compatibility with your potentiostat
- Single-use or limited re-use for your method
Chemazone India lists Nanostructured Carbon Screen Printed Electrodes and Zensor Screen Printed Electrodes in its screen printed electrode range.
Frequently asked questions
What is a screen-printed electrode used for?
For electrochemical measurements such as voltammetry and amperometry on small samples, especially in sensor and biosensor development.
Can screen-printed electrodes be reused?
They are designed as disposable devices. Some methods allow limited re-use, but results are most reliable with a fresh electrode.
What equipment do I need?
A potentiostat and a connector or cable that matches the electrode strip.
How do I get screen-printed electrode price in India?
Send the electrode type and quantity through our contact page and Chemazone India will reply with price and lead time.