I have SU-8 2000.5 and SU8- 2002 (from Microchem). I have to develop a protocol to decrease the viscosity for inkjet printing using Microfab inkjet printer.
There are a few options available for inks such as http://www.microchem.com/PriElex.htm which I have tried but the results are not very encouraging.
Any suggestions for diluting the viscosity for inkjet printing are more than welcome.
i think its depends on your solvents which you are using for the ink such as binders, resigns with ethanol, methanol solvents you can control the dilution of the inks.
Hello Ahmad,
I have linked my original answer for reference. You can use cyclopentanone in order to dilute SU-8 photoresist.
I have had varying success diluting SU8-2 [MicroChem] but below 250 nm I have found the stability of the film becomes an issue and this may cause you a problem.
I use the following formula (originally suggested by Mark Shaw [MicroChem] on the forum MEMSnet:
(1) (Starting Solid % / Final Solid %) * Starting Volume = Final Volume
(2) Final Volume - Starting Volume = Solvent Addition
Some 'Solid %' values (I usually plot then interpolate/extrapolate):
2 um: 29%
1 um: 25%
700 nm: 21%
*500nm: 14.3%
100nm: ~5%
*MicroChem have recently added a SU-8 2000.5 resist to their product range and their data sheet confirms 'Solid %' as 14.3%.
I am not sure how compatible cyclopentanone would be with your inkjet printer though.
Hope it helps,
Jules
https://www.researchgate.net/post/How_do_you_get_an_uniform_50nm_film_thickness_of_SU-8_direct_on_the_glass_substrate
read this full study: Article Epoxy Based Ink as Versatile Material for Inkjet-Printed Devices
Regards,
Maxime
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