A. Lachish-zalait et al., Direct surface patterning from solutions: Localized microchemistry using afocused laser, ADV FUNCT M, 11(3), 2001, pp. 218-223
A method for creating microscale-patterned surfaces by direct-write lithogr
aphy is described. A tightly focused, low-power infrared laser beam is appl
ied to a homogeneous precursor solution containing soluble reagents. When t
he laser is focused directly at a glass-solution interface, it initiates th
e local precipitation of a solid product that attaches firmly to the substr
ate. Operating the laser momentarily forms isolated spots, whereas moving t
he microscope stage or the laser spot draws continuous lines. The method ha
s been demonstrated for metallic silver and gold, for oxidized copper, and
for molybdenum disulfide, suggesting a broad range of suitable materials. S
ilver patterns were further modified by chemical reactions. Their morpholog
y and physical properties can be altered during deposition by the use of ca
pping agents, which may provide an onset for further functionalization.