New material

Takayuki Tsukamoto ttsukamo at stanford.edu
Wed Nov 2 13:45:38 PST 2005


Hi Mary

Thank you for your mail again.
I will stamp in my lab and etch gold in the clean room.

Best,
Taka

Mary Tang wrote:

>Hi Taka --
>
>I'm sorry, we should update our lists...  PDMS is acceptable for use in the
>lab.  Cured PDMS is allowed in most gold-compatible equipment.  Uncured
>PDMS is allowed only at the Headway and adjacent hot plate.  PDMS must be
>mixed up outside the lab (we have a place where you can mix and degas)and
>then brought in (because the silicone monomer can be very bad for resist
>adhesion in the lithography area.)
>
>You can certainly do your stamping in SNF, but many people just use their
>own labs.  If you decide to do this in the cleanroom, you do not have to be
>qualified to use the solvent wet benches, as long as you do not use hot
>plates or the sonicator, and make sure to properly dispose of any waste and
>label any containers of chemicals you use.  If you need help in going over
>any of these procedures, then let us know.
>
>In summary, for what you are proposing to do (stamping with PDMS, gold
>etching) you do not need special materials approval.  If you want to do
>molding of PDMS, let us know, and we will provide you with procedures on
>how to do this in SNF.
>
>Thanks,
>
>Mary
>
>Quoting Takayuki Tsukamoto <ttsukamo at stanford.edu>:
>
>  
>
>>Hi Mary
>>
>>Thank you for your quick reply. I thought I do stamping out of the clean
>>room and bring the masked glass substrate into the clean room, because I
>>could not find MSDS of the stamp material, poly(dimethylsiloxane), PDMS.
>>
>>The process I am doing now is just what you wrote.
>>1mM of hexadecanethiol in ethanol is dropped on the PDMS stamp, then the
>>stamp is dried, and finally the stamp is placed on gold.
>>
>>I understand that I need to use the solvent wet bench for the wetting
>>process.  I will take a training for that if I can do that process in
>>your lab.
>>
>>Thanks,
>>Taka
>>
>>Mary Tang wrote:
>>
>>    
>>
>>>Hi Taka --
>>>
>>>Transene etchant is allowed at wbgeneral for standard etching of gold,
>>>      
>>>
>>so no
>>    
>>
>>>special request is needed.  Hexadecanethiol has been used in our lab
>>>      
>>>
>>before,
>>    
>>
>>>however, not usually at wbgeneral.  Do you have a procedure that you
>>>      
>>>
>>would
>>    
>>
>>>like to use for treating your gold films?  If so, could you please
>>>      
>>>
>>provide
>>    
>>
>>>it?  Generally, it seems that hexadecanethiol is added in very small
>>>amounts to a solution of ethanol or other organic solvent.  Then, the
>>>substrate is dipped into the solution for some period of time.  Then, it
>>>      
>>>
>>is
>>    
>>
>>>dried and sometimes heated on a hot plate or in a vacuum chamber.
>>>      
>>>
>>Because
>>    
>>
>>>of the organic solvents, this is generally done at a solvent bench,
>>>      
>>>
>>rather
>>    
>>
>>>than wbgeneral, which is for acids and bases.
>>>
>>>Please do provide a procedure for treating your gold films and we will
>>>      
>>>
>>try
>>    
>>
>>>to help you with your setup.
>>>
>>>Mary
>>>
>>>Quoting Takayuki Tsukamoto <ttsukamo at stanford.edu>:
>>>
>>>
>>>
>>>      
>>>
>>>>Hello,
>>>>
>>>>I am sending this mail to inquire if I can bring in new material,
>>>>hexadecanethiol, into the clean room. I also want to ask if I can use
>>>>gold ethcant, Transene.
>>>>
>>>>I want to use a wetbench, wbgeneral to etch gold from glass substrates.
>>>>Mask of gold is mono-layer of hexadecanethiol, CAS# 2917-26-2, whose
>>>>MSDS is attached. A solution of thiol smells, but mono-layer of it
>>>>doesn't smell.
>>>>
>>>>Although I am taking a written test for wbgenral for another process, I
>>>>would like to use the bench for this process either if I could.
>>>>
>>>>Thank you,
>>>>Taka
>>>>
>>>>Takayuki Tsukamoto, PhD
>>>>Current address
>>>>----------------------------------------
>>>>Department of Chemical Engineering
>>>>Stanford University
>>>>Stauffer III
>>>>381 North South Mall
>>>>Stanford, CA 94305-5025
>>>>Phone: 650-725-3144
>>>>Fax : 650-723-9780
>>>>
>>>>Permanent address
>>>>----------------------------------------
>>>>Research Scientist
>>>>Storage Devices and Materials Lab.
>>>>Corporate R&D Center, Toshiba
>>>>1, Komukai-Toshiba-cho, Saiwai-ku,
>>>>Kawasaki 212-8582 JAPAN
>>>>tel:+81-44-549-2130 fax:+81-44-520-1802
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>
>>>
>>>
>>>      
>>>
>>
>>    
>>
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