I have been working on making some memristors so i can do some experiments on them. I think i have finally managed to make a memristor. If i understand properly, memristors are characterized by their pinched hysteresis loops, their ability to "remember" their resistance.
A memristor I-V curve
I thought that it would be a good idea to get some others opinions on weather or not i have actually made a memristor.
I will start with a quick explanation of my methods for creating a memristor.
Is my memristor.
Anyone familiar with firearms will notice that it is built inside a 0.22 cal. casing that is now very blackened. don't mind all the other stuff on my bread board, it isn't relevant.
The black stuff is Copper Sulfide(i am terrible in chemistry so if someone out there knows what this really is please tell), this is the stuff that makes all the magic happen. Before you blacken the cartridge you first have to tin the bottom where the firing pin hits the bullet because it is difficult to solder a wire onto the black stuff.
Back to the Copper Sulfide. It is created when i filled the empty cartridge with sulfur powder and heated it up until all the sulfur is burnt away, do this with safely the vapors from burning sulfur are horrible to breathe.
Next I strip about 1" of insulation off a piece of 22 AWG wire and wrap the uninsulated part around a small screwdriver 2 times to make a coil that just fits into the casing. While keeping gentle pressure on the wire taking care to only let the wire touch the bottom of the casing i filled the remaining space with epoxy. After the epoxy has dried your memristor is ready to go.
I have several I-V curves from my memristor:
It turns out making a memristor has been fairly hit and miss untill i perfected my method. This is a typical trace of my early memristors. Not quite the perfect figure 8, and it has two points where it crosses itself. Alot of the time I would get a flat line (open circuit) or a vertical line (short circuit).
Ocasionally i would end up with some strange capacitor-like trace.
After lots of work, it all payed off and I got this trace
If I'm not mistaken that is the trace of an ideal memristor.
Out of curiosity i put a 100Hz square wave through my memristor and was rewarded with one of the most interesting traces I have ever seen.
So that's my memrisor. Here is the whole gallery of images. http://imgur.com/a/ER89Y
For anyone looking to recreate this experiment, you can talk to your pharmasist and ask them to order you "Precipitated sulfur". It will be less than $15CAD for half a kilo of it(enough for 1,000,000 memristors).
I look forwards to your thoughts on my project.
also First Post! yay.
I would like to credit this web-page with the basic idea of how to make this type of memristor.http://makezine.com/2011/11/03/how-to-homemade-memristor/