Nano-Lab nanotube ink
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Nanotube Ink
The NanoLab "Nink" products are carbon nanotube inks for direct printing of nanotube electronics and sensors.
This ink contains carboxyl (COOH) functionalized carbon nanotubes in an aqueous suspension with the minimum concentration of additives to impart long term stability and printability to the ink.
NanoLab produces two types of ink, Nink-1000 (multiwall carbon nanotube ink) and Nink-1100 (single wall carbon nanotube ink).
NanoLab formulated Nink to be printable using Fuji's Dimatix TM series printers, using their 10 picoliter printhead, which has a drop size of ~21 microns. See: DMP-2800 printers

Nink technical data sheets: Nink-1000    Nink-1100
For the electrical properties of Ninks, click here
Important tips on printing with Nink, click here

We sell the Nink refill kits only, so you can fill a Dimatix print head with our Nink. Refill kits: include 100ml Nink, and if requested, a syringe and a needle.
Nink-1000 multiwall carbon nanotube ink refill kit $250
Nink-1100 single wall carbon nanotube ink refill kit $300


Electrical Properties

1x1.5 inch squares of Nink were printed using an HP Deskjet 960C onto overhead transparency film and also onto standard copier paper (20 lb).
The following sheet resistance data is an average of 5 pages, measured after each printing and a 2 minute drying step at 80C.

Test setup
We loosely followed ASTM D-254 in the measurement of the sheet resistance. We prepared a 1" square test fixture, consisting of two brass contacts, separated by a 1" square insulator, as shown below.
The fixture was firmly held against the printed sheet, and resistance was measured using a Keithley Sourcemeter 2400.
Test Setup       MWNT Nink ohm per square results    SWNT Nink ohm per square results
Test Results
The resistance of the carbon nanotube deposit printed on both the paper is plotted against the number of printing times.
On paper, the first printing results in a deposit that is below the percolation threshold.
Electrical resistance drops with the number of additional prints, as the layer of nanotubes increases in thickness.
Depending on the printer uniformity, fine features may become blurred by multiple prints.

Compatibility
The Nink was initially offered in cartridge form using the HP 45 print cartridge, which was discontinued by HP in 2013. Other inkjet print cartridges may also be used with Nink.
Select a cartridge with a large droplet size...such as 10 picoliters, equivalent to ~21 microns in diameter.
Nanotubes need to be much shorter than the droplet to avoid clogging the nozzle. Both piezoelectric and thermal print heads have been used successfully.
Youtube is a good resource for ink refilling instructional videos.

Storage, print count and shelf life
Storage in a zip-closure plastic bag at room temperature is recommended. The Nink should have a shelf life greater than one year if the storage conditions are met.


Alternative delivery vehicles
NanoLab developed a pen as an alternative delivery system for the Nink. The Nink pen contains the Nink, and enables free hand deposition or the use of a plotter style device.
We recommend the Shapeoko 2 desktop CNC unit, modified for Nink use.
That device is pictured below. It can be purchased at: https://www.inventables.com/technologies/desktop-cnc-mill-kit-shapeoko-2

We designed a pen holder for the Nink-pen. That file is available if you want to download it and 3D print it yourself.
If not, you can purchase one for $5 when you buy Nink. The Nink pen kit contains ~5ml of Nink, and comes with a 40ml vial of extra ink so you can refill these pens yourself.
Refilling is easy, they simply unscrew, but be aware of the left hand thread.

Writing code for the Shapeoko is easy. There are a number of translators for G Code (GRBL). If you'd like some sample code, give us a call.
The page was updated on 5/24/2017