Park et al. Nanoscale Research Letters 2012, 7:351 http://www.nanoscalereslett.com/content/7/1/351 glass, quartz, and PET film by LB-nTM. The masters we used for fabrication of molds were silicon wafers with dense nanoscale patterns (81 nm parallel lines, 119 nm spaces, and 200 nm height), which were made by laser interference lithography and subsequent dry etchings, as described previously [25]. The molds were fabricated by casting PUA on them. After UV curing for 30 s, the PUA molds were peeled away from the masters. To pat- tern an array of Ag nanowires, the recessed spaces of the patterned PUA molds were filled with an Ag solution contained 20 wt.% Ag nanoparticles, with particle diam- eter of 40 to 50 nm, dispersed in methanol solvent. The Ag solution in the mold was solidified at 80 °C for 10 min. The mold was then placed in contact with the substrates covered by a thin ethanol layer. The substrate (1 x 1 cm2 area) can be uniformly covered with a 100- μm-thick ethanol layer by using 10 μl of ethanol. After the ethanol layer between the mold and the substrate dried at 70 °C for 10 min, the mold was peeled away, leaving the Ag nanowires on the substrates. Figure 2 dis- plays SEM images of the Ag nanowire patterns made by LB-nTM. The patterns have 81 nm parallel lines, Page 3 of 5 119 nm spaces, and 140 nm heights. Compared to the dimensions of the master, the Ag patterns are only reduced in the z-direction (height) since the Ag solution locked inside the recessed spaces is solidified. The Ag patterns exhibit strong adhesion to the substrates and thus, easily passed Scotch tape adhesion tests. The pat- terned Ag nanowires were thermally endurable up to 500 °C but slightly shrank (about 5%) in volume. We fabricated NWGPs on transparent substrates using LB-nTM. The Ag nanowire arrays with 81 nm parallel lines and 119 nm spaces were made on 2.5 in. PET sub- strates by LB-nTM using an Ag-nanoparticle solution. The transmittance curves of the Ag NWGP were mea- sured from 400 to 1,000 nm using a UV/visible spec- trometer in polarizing mode. The detected light showed a maximum and minimum transmittance as the NWGP was rotated. The maximum transmittance (Tmax) was observed when the Ag nanowires of the NWGP were parallel to the polarized light of the UV/visible spec- trometer, and the minimum transmittance (Tmin) was observed when the nanowires were perpendicular to the light. Figure 3a shows the transmittance curves, which Figure 2 SEM images. SEM images of Ag nanowire patterns fabricated by LB-nTM.