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STM Tip Etching
28th March 2005 Charlie Sykes
Fast Etch (10sec) Slow Etch (180 sec)
SEM Images (Lou Deguzman):
STM Tip Etching
28th March 2005 Charlie Sykes
SEM High Magnification:
Fast Etch (10sec) Slow Etch (180 sec)
STM Tip Etching
28th March 2005 Charlie Sykes
EQUIPMENT NEEDED:
0.25 mm Tungsten Wire for CathodePlatinum or Platinum/Iridium (80:20) for Anode3 mol/dm3 KOH Solution Methanol(add 168g of KOH pellets to 1 liter of deionized water SLOWLY with stirring - DO NOT ADD WATER TO PELLETS, A LOT OF HEAT IS GIVEN OFF)
PROCEDURE:
Fill beaker with KOH solutionAdd electrodesConnect power supplyTurn up current to ~0.8 A for slow etch, ~1.2 A for fast etchOnce wire breaks turn off powerRinse new tip in deionized water and methanol a few times