Standard operating procedure

It is recommended to use a setup where you can run your process undisturbed

Gather all necessary glassware:
- two PTFE (Teflon) beakers
Gather all necessary chemicals:
- Concentrated sulfuric acid
- Hydrogen peroxide
Turn on MQ 30-minute timer. Flush the MQ for 30 seconds
Make sure you have compatible tweezers: PTFE (Teflon) or steel.
Pour some MQ in one beaker for rinsing. Dry any wet spots on the bench.
Calculate the portions of sulfuric acid and Hydrogen peroxide that you would like to mix:
For 3:1 sratio solurtion
- Pour 3 parts concentrated sulfuric acid into the empty beaker.
- Very slowly pour 1 part 30% hydrogen peroxide into the sulfuric acid.
  If H2O2 is poured too fast, fumes appear. The solution will heat up during this step.
The solution is now ready for sample cleaning/etching.
Dip the samples into the Piranha solution for as long as necessary.
Rinse the samples in MQ. Avoid any organic solvents.
Dry the samples away from the Piranha solution.
Let Piranha cool down until at room temperature.
Use a funnel to collect the Piranha waste in the dedicated 1L bottle located at the bottom of the left CR1 cabinet.
- Write your name and date on the bottle
- Do not close the cap tightly.
- Place the bottle at the temporary storage in CR1.
Dispose of the MQ in the sink
Ensure that all the setup that you used (beakers, volumetrics) is back in their original location.

Working with Piranha