Piezoelectric inkjet printing was used to deposit single spot microarrays onto Au-coated quartz crystals or SiN_3 substrates in air. Composite solutions of nanospheres, carbon nanotubes, and colloidal silver were printed, and their properties were quantitated. The average weight of one spot of each deposited material was determined directly using a quartz crystal microbalance. The calculated weight was used in conjunction with density to estimate the average volume of a single spot of each deposited material. It was shown that inkjet printing reproducibly formed sub-15 pl spots, suggesting this deposition method to be highly reproducible for rapid, small-scale fabrication of microarrays.
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