new chemical: silver nitrate in water

[Mary Tang]

Hi Alex --

Could you provide the MSDS for the formulation you plan to use?  I take 
that you will be using a pre-mix formulation?  (We don't allow mixing of 
powders in the cleanroom -- it you want to mix, you would have to do it 
outside the lab -- we do have some limited bench space for this, for 
we'd ask for your procedures.)  If you are using a fairly dilute silver 
nitrate, it would certainly make us happier (in addition to you 
providing your own labware.)

One suggestion:  I would suspect that pyrex or quartz lab ware might not 
work for this because it would tie up a lot of your HF (or you'd have to 
change your solution to accomodate.)  I would suspect that teflon or 
other plastic labware might not be ideal because it doesn't conduct heat 
very well, so you might have a hard time controlling temperature 
(depending on whether your reaction generates or sucks up heat.)  And if 
you're running for an hour at 50C, you might have a lot of evaporation, 
unless you put a teflon cover over your beaker.

Mary

Alex Guichard wrote:

> Hi Mary:
> Thanks for the quick response.  Here is the MSDS.  I was planning on  
> using the ctb just to get the solution to 50C, I was not planning on  
> incorporating the autoclave.  I think they use the autoclave because  
> in previous papers, they tried processing at temperatures above 100C  
> (whereas in this paper the process T is 50C).  Basically, I was just  
> planning on processing with covered labware in the ctb, instead of  
> doing it in an autoclave.  If you would prefer, I can definitely  
> supply my own labware.  Let me know if you need any more information  
> from me!
>
> Thanks,
> Alex
>
>
>
> Alex R. Guichard
> Ph.D Candidate
> Dept. of Mat. Sci. and Eng.
> Stanford University
> (m)919-434-6906  (h)650-968-1575
> (l)650-723-6352
> http://www.stanford.edu/group/brongersmagroup/
>
> On Jan 12, 2006, at 5:50 PM, Mary Tang wrote:
>
>> Hi Alex --
>>
>> Could you provide an MSDS for the solution you plan to use?  It  
>> would be helpful for our records if you have an electronic version,  
>> as we are building our electronic database.  Also, exactly how do  
>> you plan to setup your system at this bench?  I'm afraid I'm having  
>> a little difficulty envisioning how this will be setup at the CTB.   
>> And I'm curious as to why an autoclave was used (I wonder if it's  
>> because temperature control of teflon labware is difficult or if  
>> pressure was required to prevent evaporation, as you probably  
>> couldn't use an ordinary reflux unit...)  Do you end up with silver  
>> onto everything?  (If so, it would be nice if you could provide  your 
>> own labware.)
>>
>> Thanks,
>>
>> Mary
>>
>> Alex Guichard wrote:
>>
>>> Name: Alex Guichard
>>> Coral login: arguicha
>>> ph#: 3-6352
>>> PI: Mark Brongersma
>>> Chemical: Silver Nitrate (AgNO3), aqueous solution (less than 1M)
>>> Vendor: VWR, www.vwr.com
>>> Reason for request: Chemical fabrication of dense Si nanowire  
>>> arrays  (see attached .pdf paper)
>>> Process Flow: cleaning of virgin, uncontaminated prime wafers at   
>>> wbdiff (AgNO3 will not be brought to wbdiff), chemical processing   
>>> with AgNO3 (mixed with ~20ml of 49%HF) carried out at wbgeneral- 
>>> ctb  (for temperature control) for roughly 1 hour.
>>> Amount: ~ 200ml, liquid
>>> Storage: Chemical will not be stored at SNF
>>> Disposal: chemical will be disposed of into waste bottles and   
>>> labelled with proper tag.  Waste bottle will be put in waste area  
>>> in  chemical pass-through
>>>
>>>
>>> Please let me know if you need any additional information.
>>>
>>> Sincerely,
>>> Alex
>>>
>>>
>>>
>>> Alex R. Guichard
>>> Ph.D Candidate
>>> Dept. of Mat. Sci. and Eng.
>>> Stanford University
>>> (m)919-434-6906  (h)650-968-1575
>>> (l)650-723-6352
>>> http://www.stanford.edu/group/brongersmagroup/
>>
>>
>>
>>
>> -- 
>> Mary X. Tang, Ph.D.
>> Stanford Nanofabrication Facility
>> CIS Room 136, Mail Code 4070
>> Stanford, CA  94305
>> (650)723-9980
>> mtang at stanford.edu
>> http://snf.stanford.edu
>>
>>
>


-- 
Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA  94305
(650)723-9980
mtang at stanford.edu
http://snf.stanford.edu