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STM Tips. Piezo actuators. Atomically Sharp Tips:. Z. X. Y. DC Bias. 28 th March 2005. Charlie Sykes. STM Tip Etching. 1A/10V. W Anode. Pt Cathode. KOH (3M). 28 th March 2005. Charlie Sykes. STM Tip Etching. Omicron Instruments. Homemade. 28 th March 2005. Charlie Sykes.

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Presentation Transcript
slide1

STM Tips

Piezo actuators

Atomically Sharp Tips:

Z

X

Y

DCBias

28th March 2005

Charlie Sykes

slide2

STM Tip Etching

1A/10V

W Anode

Pt Cathode

KOH (3M)

28th March 2005

Charlie Sykes

slide3

STM Tip Etching

Omicron Instruments

Homemade

28th March 2005

Charlie Sykes

slide4

STM Tip Etching

10X

50X

Optical Microscope:

28th March 2005

Charlie Sykes

slide5

STM Tip Etching

SEM Images (Lou Deguzman):

Fast Etch (10sec)

Slow Etch (180 sec)

28th March 2005

Charlie Sykes

slide6

STM Tip Etching

SEM High Magnification:

Fast Etch (10sec)

Slow Etch (180 sec)

28th March 2005

Charlie Sykes

slide7

STM Tip Etching

EQUIPMENT NEEDED:

0.25 mm Tungsten Wire for Cathode

Platinum or Platinum/Iridium (80:20) for Anode

3 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 solution

Add electrodes

Connect power supply

Turn up current to ~0.8 A for slow etch, ~1.2 A for fast etch

Once wire breaks turn off power

Rinse new tip in deionized water and methanol a few times

28th March 2005

Charlie Sykes