Difference between revisions of "How to clean a sample prior to lithography"

From Applied Optics Wiki
Jump to: navigation, search
Line 1: Line 1:
 
Cleaning of substrates / samples should always be done in the fume cupboard. Lab coat, goggles and gloves should be worn at all times.
 
Cleaning of substrates / samples should always be done in the fume cupboard. Lab coat, goggles and gloves should be worn at all times.
  
Start with a clean beaker add [[ethyl lactate]] (yellow bottle) to the bottom to cover the samples, then put the beaker in the ultrasonic bath for ~ 8 minutes. The bath should be ~half full of water, top up with [[ultrapure water]] or [[distilled]] if required.
+
Use clean glassware, the ultrasonic bath should be ~half full of water, top up with [[ultrapure water]] or [[distilled]] if required and samples
 +
should be placed in clean glassware, just covered in solvent in the bath.  
  
When the time is up, carefully remove the samples and dry using the nitrogen gun and place in a clean beaker. The nitrogen should be turned on at the gas bottle with the pressure set to ~1 bar, then turn on the gas feed for the [[nitrogen]] on the fume cupboard itself. when all samples are dry cover with [[acetone]] and put back in the bath for 8 minutes.
+
The [[nitrogen]] should be on at the bottle and the N2 gun line should be set to 1 bar.
  
As acetone is not very good to breath in, when the time is up, do not dry with the nitrogen gun, just rinse with [[methanol]] and place in a clean beaker, top up with methanol and return to the bath for ~8 minutes again.
+
(1) 8 minutes in [[ethyl lactate]] (yellow bottle) in the ultrasonic bath.
  
Dry the samples with nitrogen and add to a beaker of [[isopropanol]] (blue bottle) and put back in the bath for 8 minutes.
+
Dry with the [[nitrogen]] gun.
 +
 
 +
(2) 8 minutes in [[acetone]] in the ultrasonic bath.
 +
 
 +
Dry with the [[nitrogen]] gun.
 +
 
 +
(3) Rinse with [[methanol]] then 8 minutes in the ultrasonic bath.
 +
 
 +
Dry with the [[nitrogen]] gun.
 +
 
 +
(4) 8 minutes in [[isopropanol]] (blue bottle) in the ultrasonic bath.
  
 
Finally dry the samples and put into a clean beaker. The samples are now clean and ready to use.
 
Finally dry the samples and put into a clean beaker. The samples are now clean and ready to use.

Revision as of 09:09, 8 September 2010

Cleaning of substrates / samples should always be done in the fume cupboard. Lab coat, goggles and gloves should be worn at all times.

Use clean glassware, the ultrasonic bath should be ~half full of water, top up with ultrapure water or distilled if required and samples should be placed in clean glassware, just covered in solvent in the bath.

The nitrogen should be on at the bottle and the N2 gun line should be set to 1 bar.

(1) 8 minutes in ethyl lactate (yellow bottle) in the ultrasonic bath.

Dry with the nitrogen gun.

(2) 8 minutes in acetone in the ultrasonic bath.

Dry with the nitrogen gun.

(3) Rinse with methanol then 8 minutes in the ultrasonic bath.

Dry with the nitrogen gun.

(4) 8 minutes in isopropanol (blue bottle) in the ultrasonic bath.

Finally dry the samples and put into a clean beaker. The samples are now clean and ready to use.

Between the stages the beakers should be cleaned. to do this, wash out the beaker with the same chemicals in order as above and place upside down at the back of the fume cupboard on a tissue to dry. Once dry they can be used again or put into the glassware cupboard.

If the wash bottles get low/empty, they can be refilled by topping up from the main store bottles in the chemical cupboard. bottles should be topped up in the fume cupboard and any spillage wiped off the main bottle before being put back into the cupboard.

When finished turn off the nitrogen both at the main bottle and at the fume cupboard.