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Purchase Electrodes for R&D

Electrodes for Research & Development

The Electronics Design Center can provide thick film printed and thin film sputtered electrodes for R&D testing purposes.  Interdigitated electrodes and four point probe are the most common type of electrodes requested. Please email lxd3@cwru.edu for more detailed information.

Item 101

Item # 101 - Interdigitated Finger Electrode (5x5mm) - This electrode consists of thick film printed interdigitated platinum, gold or silver lines on a 0.6 mm thick alumina substrate. Line width and gap is 0.25 mm. The overall dimensions of the alumina are 5 mm x 5 mm. The electrode is used by spreading material over the interdigitated fingers. The holes in the bonding pads allow wires to be threaded through them for electrical connection.

Item 102

Item # 102 – Thick Film Interdigitated Finger Electrode - This thick film printed electrode consists of interdigitated gold lines on a 0.6 mm thick alumina substrate. The over all dimensions of the alumina substrate is 15 mm x 15 mm. The electrode is used by spreading material over the interdigitated fingers. The holes in the bonding pads allow wires to be threaded through them as an aid for electrical connection. The gold thick film screen printed electrode fingers are 250 μm wide with 250 μm spacing between them. The 102 can be made in platinum by special request.

Item 103

Item # 103 and 103a – Thick Film Interdigitated Finger Electrode with heater and temperature detector
This electrode consists of thick film printed interdigitated platinum lines (Item 103 - 250 μm width and spacing, 103a - 350 μm width and spacing ) and platinum resistance temperature detector (RTD) on one side of an alumina substrate and a platinum heater on the other side. The over all dimensions of the alumina is 15 mm x 13 mm (see drawing above). The bonding pads are silver for easier soldering.

Item 106

Item # 106 –Thin Film Interdigitated Finger Electrodes - This thin film fabricated electrode consists of interdigitated platinum or gold lines on a silicon, Pyrex or highly polished alumina substrate. On silicon substrates there is 3000 Angstrom thick layer of thermally grown, electrically insulating silicon dioxide between the metallic interdigitated fingers and the silicon substrate.  The overall dimensions of the substrate are 8 mm x 8 mm.    #106 electrodes have 100 micron line/spaces, #106b electrodes have 30 micron line/spaces aand #106c electrodes have 50 micron line/spaces between the interdigitated fingers.

Item 110

Item # 110 – Thick Film Interdigitated Finger Electrode with heater - This electrode consists of interdigitated platinum lines and a platinum heater on the other side. The over all dimensions of the alumina are 4.2 x 25.4 mm (see drawing above). The bonding pads are platinum. Glassy insulation (green or blue in coloring) covers the heater to prevent shorting.

Item # 112 –Thin Film Interdigitated Finger Electrodes - This thin film fabricated electrode consists of interdigitated platinum or gold lines on a silicon, Pyrex or highly polished alumina substrate.  On silicon substrates there is a 3000 Angstrom thick layer of thermally grown, electrically insulating silicon dioxide between the metallic interdigitated fingers and the silicon substrate.  The overall dimensions of the substrate are 8 mm x 8 mm.  #112 electrodes have 20 micron line/spaces , #112b electrodes have 10 micron line/spaces, #112c electrodes have 5 micron line/spaces between the interdigitated fingers.

Item #113

Item # 113 - Interdigitated Finger Electrode with Silver Reference Electrode - This electrode consists of thick film printed interdigitated gold or platinum lines (200 µm width and spacing) with a silver electrode in between the two interdigitated electrodes.  The substrate is alumina with overall dimensions of 10 mm x 10 mm.  The substrate is alumina (CoorsTek ADS-996).

Four Point Probe Electrodes - for measuring the resistivity of the film put on top of the metal fingers

Item #100

Item # 100 – Thick Film 4-Point Probe Electrode - This electrode consists of four thick film gold lines on an alumina substrate. The over all dimensions of the alumina is 12 mm x 10 mm.   The thickness of the gold lines is between 10 and 15 microns thick. The electrode is used by spreading material over the four electrodes and then testing the resistivity of the material. 

Item #107

 Item # 107 - Thin Film Platinum 4 Point Probe Electrodes - This electrode consists of four thin film sputtered platinum electrodes on a silicon substrate (with a silicon dioxide insulation layer). The overall dimensions of the silicon die are 8 mm x 8 mm.   The platinum thickness is between 1000 and 2000 Angstroms. Line spacing on this item is 500 microns.  There is an insulation layer of silicon dioxide that separates the bonding pad area of the four point probe electrodes and the area where the material you are testing goes.  There are versions without the insulation layer available.

Item #115

 Item # 115 - Thin Gold 4 Point Probe Electrodes- This electrode consists of four thin film sputtered gold electrodes on a highly polished alumina or Pyrex substrate. The overall dimensions of the silicon die are 12 mm x 14 mm.  The gold thickness is approximately 2000 Angstroms. Line spacing on this item is 2.5 mm.