[labnetwork] HMDS lifetime in YES oven

[Bruce Tolleson]

Zhichao,
  We test for the effect of the HMDS because sometimes a year is too long.  We use a Goniometer to measure the effectiveness of the hydrophobic surface.  By measuring the angle of the face of a water drop you can tell if the surface is hydrophobic or hydrophilic.
When we lose the hydrophobic angle we change the HMDS.

Bruce Tolleson
RIT SMFL

From: labnetwork <labnetwork-bounces at mtl.mit.edu> On Behalf Of Zhichao Wang
Sent: Monday, April 8, 2024 5:40 PM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] HMDS lifetime in YES oven

Dear Lab Network,

I was wondering how long the lifetime is for the HMDS in the YES oven. On the note from the YES's website, it says " If the HMDS is more than a year old, it should probably be replaced". I would assume the "year" here starts from the HMDS manufactured date, which is the shelf life for a brand new bottle of HMDS. Do you guys have experience on using the HMDS for extended time (like 6+ months) after the expiration date? Please let me know your thoughts and suggestions. Many thanks!


Best,
Chao



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Zhichao "Chao" Wang, Ph.D.
Lithography Engineer
UDNF
University of Delaware
Pronouns: He/Him/His
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