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> Nanotech forum > Nanotech > Gold nanorods
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Gold nanorods |
Alexey
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Mon Apr 2 04:58:18 2007
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Gold nanorods |
Discuss new exciting sigar-shaped gold nanoparticles, called nanorods.
Some links are here:
http://www.nanogallery.info/nanogallery/?r=2
http://www.nanogallery.info/nanogallery/?ipg=163
http://www.nanogallery.info/nanogallery/?ipg=140
Nanorods can be used in experiments with trenches, as explained here:
http://www.nanogallery.info/nanogallery/?ipg=109 |
| Created: Fri Apr 6 20:10:32 2007
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Alexey
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Mon Apr 2 04:58:18 2007
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RE: Gold nanorods |
| One idea suggested by my colleague (Misha) is to do Raman spectroscopy on these nanorods. Anybody knows if it was done already. Misha mentioned that one might attach some molecules to the nanorods and observe a Raman shift. Thus they can be used as probes or sensors. What kind of molecules can be attached? |
| Created: Tue Apr 10 00:11:21 2007
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Physya The Cat
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Wed Apr 18 04:02:53 2007
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RE: Gold nanorods |
Folks,
Before you get overly excited about this, look for pubs of this person:
http://www.chem.sc.edu/people/facultyStaffDetails.asp?SID=32
She is the foremost expert on gold and silver nanorods and they studied optical properties |
| Created: Wed Apr 18 04:07:13 2007
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Alexey
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Mon Apr 2 04:58:18 2007
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RE: Gold nanorods |
| yes, she has nice rods on her web-page. |
| Created: Wed Apr 18 04:42:58 2007
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Eugene
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Wed Apr 18 06:54:58 2007
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RE: Gold nanorods |
| Yes, Cathy is the person who invented the synthesis of nanorods in aqueous solution. That was back in 2000 and she is indeed the biggest expert in this area. So the nanorods are not necessarily new nanoparticles, they've been around for quite some time. |
| Created: Wed Apr 18 06:58:00 2007
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Alexey
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Mon Apr 2 04:58:18 2007
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RE: Gold nanorods |
When we deposit nanotubes, we typically sonicate the solution with nanotubes in it first.
Can the long gold nanorods withstand sonication or would that damage them? |
| Created: Sun Apr 22 02:06:12 2007
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Physya The Cat
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Wed Apr 18 04:02:53 2007
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RE: Gold nanorods |
| depends what you call sonication. if you just wash them in ultrasonic bath, they'll take it (but this is not sonication). |
| Created: Sun Apr 22 06:27:01 2007
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Alexey
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Mon Apr 2 04:58:18 2007
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RE: Gold nanorods |
so what is "sonication" then?
I used to think it is just an exposure to ultrasonic waves? |
| Created: Tue Apr 24 06:11:34 2007
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Eugene
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Wed Apr 18 06:54:58 2007
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RE: Gold nanorods |
| There is no need to sonicate gold nanorods because they are not aggregated in solution. I do believe that sonication can do more harm then good to them. |
| Created: Thu Apr 26 02:22:56 2007
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Alexey
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RE: Gold nanorods |
Thomas made a pictures of nanorods deposited over Si substrate with a slit. for some reason nanorods did not cross the slit itself.
The picture is here:
http://www.nanogallery.info/filez/gold%20nanorods.tif |
| Created: Thu Apr 26 02:47:54 2007
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Alexey
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New images of Au nanorods |
Recently Jaseung tried to deposit Au nanorods on Si wafers. Here is some pictures:
http://www.nanogallery.info/filez/Au-nanorod%20on%20Si-1.jpg
http://www.nanogallery.info/filez/Au-nanorod%20on%20Si-2.jpg
http://www.nanogallery.info/filez/Au-nanorod%20on%20Si-3.jpg
The rods are clearly visible. In addition, we see spheres and triangles. What are these things?
The main problem is that, perhaps due to those spheres, the rods are attached to each other and form tangles. How one can separate them? Should we try to make a lower concentration? Or perhaps change the solvent? Or perhaps change the substrate (say put Au on the substrate)?
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| Created: Sat May 19 00:46:24 2007
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111
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Sat May 19 02:43:26 2007
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Spheres and rods |
Yes, it looks like there is a lot of spheres sticking to the rods. It maybe possible to detach the spheres by removing CTAB and reducing the concentration, but to separate the rods from other shapes is not possible as of yet. We tried several times but could not succeed. We'll try again soon. I'll keep you posted.
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| Created: Sat May 19 02:44:03 2007
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