New material

Mary Tang mtang at
Wed Nov 2 13:14:44 PST 2005

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.



Quoting Takayuki Tsukamoto <ttsukamo at>:

> 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>:
> >
> >
> >
> >>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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