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cleaning [2013/04/09 15:36] – mcmaster | cleaning [2013/11/17 06:48] – mcmaster | ||
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====== JM chip cleaning procedure as of 03/09/2013 ====== | ====== JM chip cleaning procedure as of 03/09/2013 ====== | ||
- | * Fill 10 mL glass vial w/ polyprolyene cap about 2/3 | + | * Fill 10 mL glass vial w/ polyprolyene cap about 2/3 full with acetone |
* Glass has better acoustic coupling than plastic and removes a lot more | * Glass has better acoustic coupling than plastic and removes a lot more | ||
* Place chip in above vial and sonicate for 1 minute | * Place chip in above vial and sonicate for 1 minute | ||
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* Higher initial cost than other techniques presented here | * Higher initial cost than other techniques presented here | ||
* Takes a few minutes (but hopefully you aren't THAT impatient) | * Takes a few minutes (but hopefully you aren't THAT impatient) | ||
+ | |||
+ | |||
+ | ===== Choice of container ===== | ||
+ | |||
+ | {{:: | ||
+ | {{:: | ||
+ | |||
+ | Using a glass container with strong ultrasound cleans the chip well, but may be stronger than needed. | ||
+ | |||
===== Case study ===== | ===== Case study ===== | ||
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"find a polyimide layer that was not entirely removed by HNO3 but which can be dissolved with ethylendiamine" | "find a polyimide layer that was not entirely removed by HNO3 but which can be dissolved with ethylendiamine" | ||
+ | |||
+ | |||
+ | ==== Ethylendiamine ==== | ||
+ | |||
+ | From [Beck 23] | ||
+ | |||
+ | Procedure: | ||
+ | * Use straight (how much?) | ||
+ | * 100° C for 15-60 | ||
+ | |||
+ | |||
+ | ==== Ethylendiamine + hydrazine monohydrate ==== | ||
+ | |||
+ | From [Beck 23]. Use this if plain ethylendiamine does not work. Unclear if it has a higher corrosion potential, but heed the safety warning | ||
+ | |||
+ | Procedure: | ||
+ | * Mix (how much?) | ||
+ | * 7 mL 80% hydrazine monohydrate | ||
+ | * 1 mL ethylendiamine | ||
+ | * 100° C for 15-60? | ||
+ | |||
+ | Notes: | ||
+ | * WARNING: spontaneous combustion can occur over 120° C | ||
+ | |||
+ | |||
+ | ==== Ethylendiamine + hydrazine monohydrate ==== | ||
+ | |||
+ | [Beck 23] | ||
+ | |||
+ | Procedure: | ||
+ | * Mix | ||
+ | * 3 mL ethylendiamine | ||
+ | * 1 mL 98% acetic acid | ||
+ | * Cook 120-130° C for 10-30 minutes | ||
+ | |||
+ | Notes: | ||
+ | * Mix slowly (or what?) | ||
+ | * Stir vigorously | ||
+ | |||
+ | |||
+ | ==== Caro's acid ==== | ||
+ | |||
+ | [Beck 23] | ||
+ | |||
+ | Procedure: | ||
+ | * Mix | ||
+ | * 7 mL (98%?) H2SO4 | ||
+ | * 1 mL 30% H2O2 | ||
+ | * Cook at 80° C | ||
+ | |||
+ | ==== Fuming nitric acid (FNA) ==== | ||
+ | |||
+ | When decapping part with WFNA/RFNA the amide layer will usually be simply dissolved [Beck 23, personal experience] | ||
+ | |||
+ | Beck mentions " | ||
+ | |||
+ | |||
+ | ==== Oxygen plasma ==== | ||
+ | |||
+ | " | ||
+ | |||
+ | |||
+ | ==== Dimethyl sulphoxide + ethanolamine ==== | ||
+ | |||
+ | [Beck 23] | ||
+ | |||
+ | Procedure: | ||
+ | * Mix | ||
+ | * 3 mL dimethyl sulphoxide | ||
+ | * 1 mL part ethanolamine | ||
+ | * Cook at 110° C | ||
+ | |||
+ | WARNING: | ||
+ | * Spontaneous combustion above 120° C | ||