From uli at snf.stanford.edu Tue Jul 5 11:34:23 2011 From: uli at snf.stanford.edu (uli at snf.stanford.edu) Date: Tue, 5 Jul 2011 11:34:23 -0700 Subject: Problem wbsilicide SNF 2011-06-30 15:41:08: i dropped the gold handle in the H2SO4 pot Message-ID: handle out of bath. From latta at snf.stanford.edu Fri Jul 22 17:04:20 2011 From: latta at snf.stanford.edu (latta at snf.stanford.edu) Date: Fri, 22 Jul 2011 17:04:20 -0700 Subject: Problem wbsilicide SNF 2011-07-22 17:04:19: New SC-1 Message-ID: Please be advised that the organic clean bath (4:1 sulfuric peroxide) has been permanently changed to 5:1:1 H2O:H2O2;NH4OH. The bath must be changed every four hours and the addition of H2O2 is allowed, much the same as the 5:1:1 H2O;H2O2:HCl bath. The bath temperature is 50C and the time remains 10 minutes. There are several very good reasons for the change; 1) safety, 2) better quality clean, 3) sulfur contamination of nanowires and 4) lower chemical costs and on-site inventory. Look for the forthcoming white paper on the wiki. It will include references and results of our tests. Please direct any questions or concerns to SNF staff members. From smitmegh at snf.stanford.edu Sun Jul 24 20:44:23 2011 From: smitmegh at snf.stanford.edu (smitmegh at snf.stanford.edu) Date: Sun, 24 Jul 2011 20:44:23 -0700 Subject: Comment wbsilicide SNF 2011-07-24 20:44:23: 9:1 H2SO4:H2O2 Bath Needs Changed Message-ID: The 9:1 H2SO4:H2O2 bath needs changed. The bath turned brown during a cleaning I performed Sunday afternoon, and it was still too hot for me to drain and change the bath when I had to leave.