Grow them on a electrode!(?)

Hi Shivesh, If the length is in micron size you can probably try the Dielectrophoresis technique.

There is plenty of work done on this for aligning SWCNTs , MWCNTs. I think you can follow this technique for transport measurements also.

following links would be helpful for you.

http://pubs.acs.org/doi/abs/10.1021/nl900423g

http://iopscience.iop.org/0957-4484/17/14/009/

Hi Shivesh

if you have GaN nanowire arrays on any substrate?

then you can sputter some suitable metal ( whose work function is comparable) on the top and bottom of the device to make electrical contact.

Here's another link: http://sfx.utwente.nl:3210/prod?sid=Elsevier:Scopus&__service_type=getFullTxt&issn=00219797&isbn=&volume=355&issue=2&spage=486&epage=493&pages=486-493&artnum=&date=2011&id=doi:10.1016%2fj.jcis.2010.12.011&title=Journal+of+Colloid+and+Interface+Science&atitle=Dielectrophoretic+alignment+of+metal+and+metal+oxide+nanowires+and+nanotubes%3a+A+universal+set+of+parameters+for+bridging+prepatterned+microelectrodes&aufirst=A.W.&aulast=Maijenburg

If it's just for 1 measurement and you have access to a FIB (Focused Ion Beam), then that could also be an option.

thanks to all.......what about if I use EBL???

I've tried EBL a few years ago, but in my opinion the change that you connect 1 wire with 2 contact pads on both ends is too small. But if you're already very experienced with EBL and lift-off, you might give it a try

Making contacts to nanowires/structures is an elaborate process. A set of markers is to be initially put in on the substrate and then the nanowires are grown/dispersed and the position is identified. once the position is know, you can use EBL to make electrical contacts.

You can use Focused Ion/Electron Bem Deposition of metal instead of EBL. It is an easy way we are using a lot in our lab.

EBL is not too difficult as well. We also do it as an almoust rutinary process and have developed some tools that are making the work relatively easy (in some cases 100% success with EBL+lift off and 9 to 16 wires 2 or 4 point connected on a 1/2 inch chip).

Making electrical contact to a single nanowire is a difficult and challenging process as mentioned by Ravi Kumar. One way is to contact with an Atomic Force Microscope (AFM).

Have a look:

https://www.researchgate.net/publication/49806028_An_improved_AFM_cross-sectional_method_for_piezoelectric_nanostructures_properties_investigation_application_to_GaN_nanowires?ev=prf_pub

(I can send you the paper if needed)

If you should need technological facilities to contact GaN nanowires, then you'll need at least to use photolithography (OK for large wires, 200nm in diameter, but impossible for thinner ones), or ebeam lithography (EBL) (time & cost expensive).

We can eventually measure or process your samples (but we'll need more info).

Or you may need to come to France to make your own experiments !

Have fun with your nanowires, and of course safely !

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