NFAP writing test

• Imaging test was tried first, but the reflection coating was not enough for laser bounce detection. New layer of gold was deposited by sputtering. After this, the calibration grid was scanned and the result was good.
• Since the inks used last Saturday showed inconsistent results, new ink was prepared: saturated solution of MHA in acetonitrile. Writing test with commercial tips. It showed pretty good result, even though the dots made was disappearing with repeated scan over the same area after the writing.
• The solution of MHA in acetonitrile was put on the reservoir. However, the solution didn't go into the channels. A PDMS cover and treatment with oxygen plasma may need to be tried.