ZIF-8 on Silicon 100
The NIST crew have asked me to try and grow some MOF or ZIF on a Si chip. Nikolai Klimov made some chips that have been coated in PMMA except for a small window that has exposed Si.
It seems like the best way to do this will be to put down a monolayer of silane down on the Si first. However, I'm going to try some brute force methods first.
- Depositing pre-synthesized and purified ZIF-8 onto the chip
- suspend ~ 1mg of ZIF-8 (prepared by Michael Bible) in 500μL of HPLC pure water
- deposit 100μL of this suspension onto the chip and allow to evaporate
- Synthesize ZIF-8 on chip (using protocol from doi: 10.1039/c0cc05002d)
- Stock solutions
- 1.1558g of Zn(NO3)2·6H2O in 7.938g of water (HPLC pure)
- 2.293g of 2-methylimidazole in 7.998g of H2O (HPLC pure)
- Synthesis
- Add 9.1 μL of Zn solution to the middle of the chip
- Add 91 μL of the 2-methylimidazole solution to the chip (on top of Zn solution)
- Allow to evaporate
Observations
- Depositing pre-synthesized and purified ZIF-8 onto the chip
- The powder wasn't fully suspended and was a VERY pale milky hue.
- I'm keeping this trial dilute just to see if this stuff lays down on the surface or not.
- Synthesize ZIF-8 on chip (using protocol from doi: 10.1039/c0cc05002d)
- As soon as the solutions were mixed, a white ppt appeared.
- This trial looks like I might have had too high of a concentration. I may decrease it for the next run, but I want to see what the surface looks like first.
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