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--- nanotube_growth [2022/08/09 16:17] – dublin
+++ nanotube_growth [2022/08/09 16:33] (current) – dublin
@@ Line 45: / Line 45: @@
 (Click here for [[other recipes]]) and [[old_recipes]]
-==== 1" Furnace growth
+==== 1" Furnace growth ====
+__**Startup/Loading chips**__
+  - Keep chips ready for growth in furnace
+  - PNF are for Utah
+  - PNF - 2 micron trench
+  - PNR - 2.6 micron trench
+  - To pressurize:
+  - Connect hand pump to nipple
+  - Black button releases pressure
+  - Pump up to 25 in Hg
+Ethanol/methanol levels: Use around half as much Methanol as Ethanol. (In my experience, a 1:1 ratio produces more multi-tube sites and shorts, so this ratio is important. - Dublin)
+  - Fill out logbook
+  - Always run purge
+  - STD growth
+  - Humidity
+  - Turn on Dehumidifier
+  - Humidity should be around 30%
+  - Check end cap is secure
+  - Check Ar and H tanks
+  - 20PSI on both
+  - Lose around 5psi of argon tank pressure per hour of flowing
+  - Load in chips. (I have successfully grown 3 at a time, which is all you can fit on the boat. - Dublin)
+  - Unscrew the end part
+  - Careful not to drop it
+  - Attach magnet to end of tray and slide in chip
+  - Reattach end part
+  - Current tube 2022:  “Tristan”
+__**Growth Process**__
+Input purge parameters:
+Anneal:
+  * 30 C
+  * 3 min
+  * Hydrogen: 0.45 SLM
+  * Argon: 1SLM
+Transition:
+  * 0 min (no transition)
+Growth:
+  * 30 C
+  * 3 min
+  * Hydrogen 0.45 SLM
+  * Methanol 0.3 SLM
+  * Ethanol 0.15 SLM
+  - Set timer for 5 min and start purge. Will go through anneal and “growth” stages at 30 C
+  * When changing parameters, give the program a few seconds to get it
+  * After purge finishes, reinitialize parameters
+  * Wait until all flow rates show zero
+Growth Parameters:
+Anneal:
+  * 800 C
+  * Hydrogen: 0.45 SLM
+  * 1 min
+Transition:
+  * 0 min ramp time
+Growth:
+  * 800 C
+  * 5 min
+  * Hydrogen 0.45 SLM
+  * Methanol 0.3 SLM
+  * Ethanol 0.15 SLM
+  - Start growth and set a timer for 14:30. When the furnace reaches 798 C, slowly and deliberately slide in tubes
+  - Once anneal phase begins, set timer for 4:30 min
+  - To check if it’s working: Ethanol and methanol are bubbling.
+  - When PID controller clicks off (growth is finished):
+  - Pull chip to rim of insulating chamber and allow to sit until 790 C
+  - Pull chip fully out
+  - When temp is 500 C, open lid
+  - When temp is 200 C or lower, pull out chip
+  - The program flows argon before 200C
+  - Close lid
+  - Unscrew end connector
+  - Drag magnet as far to the left as possible
+  - Grab back end of sled and pull chip straight out
+  - Grab in center of rod
+  - Keep the chip level! It’s not connected
+  - Place chip on beta wipe
+  - Hold rod while grabbing chip and place chip in holder
+  - Store rod in quartz tube, cap it up
+  - Screw end cap back on and seal tube
+  - Once chamber is cooled back down to room temperature, ready for another growth