https://wiki.nbi.ku.dk/w/cleanroom/index.php?action=history&feed=atom&title=Working_with_Piranha 2026-09-12T05:40:56Z Revision history for this page on the wiki MediaWiki 1.43.9 https://wiki.nbi.ku.dk/w/cleanroom/index.php?title=Working_with_Piranha&diff=3160&oldid=prev 2026-09-10T16:02:27Z

<p><span class="autocomment">Mixing KOH pellets and etching</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en-GB"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:02, 10 September 2026</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>=<del style="font-weight: bold; text-decoration: none;">=Mixing KOH pellets and etching=</del>=</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>=<ins style="font-weight: bold; text-decoration: none;">Standard operating procedure</ins>=</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;div style=&quot;background-color: #c0c0c0; border: 1px solid #00000; padding: 10px; border-radius: 5px;&quot;&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;div style=&quot;background-color: #c0c0c0; border: 1px solid #00000; padding: 10px; border-radius: 5px;&quot;&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Book the HF fumehood in CR1.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Book the HF fumehood in CR1.</div></td></tr> </table>

Harry https://wiki.nbi.ku.dk/w/cleanroom/index.php?title=Working_with_Piranha&diff=3159&oldid=prev 2026-09-10T16:02:02Z

<p>Created page with &quot;==Mixing KOH pellets and etching== &lt;div style=&quot;background-color: #c0c0c0; border: 1px solid #00000; padding: 10px; border-radius: 5px;&quot;&gt; * Book the HF fumehood in CR1. : &#039;&#039;It is recommended to use a setup where you can run your process undisturbed&#039;&#039; * 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 hav...&quot;</p> <p><b>New page</b></p><div>==Mixing KOH pellets and etching==<br /> &lt;div style=&quot;background-color: #c0c0c0; border: 1px solid #00000; padding: 10px; border-radius: 5px;&quot;&gt;<br /> * Book the HF fumehood in CR1.<br /> : &#039;&#039;It is recommended to use a setup where you can run your process undisturbed&#039;&#039;<br /> * Gather all necessary glassware:<br /> ** two PTFE (Teflon) beakers<br /> * Gather all necessary chemicals:<br /> ** Concentrated sulfuric acid<br /> ** Hydrogen peroxide<br /> * Turn on MQ 30-minute timer. Flush the MQ for 30 seconds<br /> * Make sure you have compatible tweezers: PTFE (Teflon) or steel. <br /> * Pour some MQ in one beaker for rinsing. Dry any wet spots on the bench.<br /> * Calculate the portions of sulfuric acid and Hydrogen peroxide that you would like to mix:<br /> *: &#039;&#039;&#039;For 3:1 sratio solurtion&#039;&#039;&#039;<br /> ** Pour 3 parts concentrated sulfuric acid into the empty beaker.<br /> ** Very slowly pour 1 part 30% hydrogen peroxide into the sulfuric acid.<br /> **: &#039;&#039;If H2O2 is poured too fast, fumes appear. The solution will heat up during this step.&#039;&#039;<br /> * &#039;&#039;&#039;The solution is now ready for sample cleaning/etching.&#039;&#039;&#039;<br /> * Dip the samples into the Piranha solution for as long as necessary.<br /> * Rinse the samples in MQ. Avoid any organic solvents.<br /> * Dry the samples away from the Piranha solution.<br /> * Let Piranha cool down until at room temperature. <br /> * Use a funnel to collect the Piranha waste in the &#039;&#039;&#039;dedicated 1L bottle located at the bottom of the left CR1 cabinet&#039;&#039;&#039;.<br /> ** &#039;&#039;&#039;Write your name and date on the bottle&#039;&#039;&#039;<br /> ** &#039;&#039;&#039;Do not close the cap tightly.&#039;&#039;&#039;<br /> ** &#039;&#039;&#039;Place the bottle at the temporary storage in CR1.&#039;&#039;&#039;<br /> * Dispose of the MQ in the sink<br /> * Ensure that all the setup that you used (beakers, volumetrics) is back in their original location.<br /> &lt;/div&gt;</div>

Harry