Artificial semiconductor??

Question

Hello:I have an engineering application where I need a "semiconducting"material in large sheet form.  Silicon is too brittle and expensive. The most ideal material would have a resistivity of about 250ohm-meters and about 1 mm thick.  This is strictly for a resistanceapplication, so it does not need to exibit "electronic" properties.Is there some sort of graphite-impregnated material that would havesuch a resistivity?  Is there anything at all that might?Though 250 ohm-m and 1.0 mm are ideal parameters, I am somewhatflexible.  If, for example, I could find a material that is say 1000ohm-m, I could use a different thickness or even adjust my workingvoltage to suit the situation.All replies are greatly appreciated.Don

Phil Hobbs · Accepted Answer

Mirror tile?Cheers,Phil Hobbs

David Deuchar · Answer

Could you use an aqueous solution or a wet porous material.

Boris Mohar · Answer

Check out carbon fiber cloth.Regards,Boris MoharGot Knock? - see:Viatrack Printed Circuit Designs

Kevin G. Rhoads · Answer

Antimony-tin-oxide on glass (used for resistive touch screens)Shell ASA-3 (or other fuel antistatic additive) in polymers, w/ or w/o graphitefillerPlate on thin copper layer, oxidize to right resistivity range(just a few possibilities)

Don A. Gilmore · Answer

Thanks for all the replies.I should have mentioned that current has to pass through the entire slab,not just on the surface.Don

Stackclimber · Answer

I didn't notice anyone suggesting the possible use of plain old grahitesheet, like for cutting out gaskets.

Erez Volach · Answer

You can try using solder material (tin alloy) with some filler to reduce itsconductivity, or high loadings of carbon black in a polymer matrix

Artificial semiconductor??

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