Figure 3.

Scanning electron micrographs of unmodified and quantum dot-coated Gantrez^® AN-139 microneedles. (a) Scanning electron micrograph of three unmodified Gantrez^® AN-139 polymer microneedles in a five microneedle array; these microneedles were produced using visible light dynamic mask micro-stereolithography-micromolding. (b) Scanning electron micrograph of three quantum dot-coated Gantrez^® AN-139 polymer microneedles in a five microneedle array; these microneedles were produced using visible light dynamic mask micro-stereolithography-micromolding and piezoelectric inkjet printing. Triangle-shaped regions, which were modified by the quantum dot solution, can be observed on the longitudinally cut surfaces of the coated microneedles.