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Edited by Catherine J. Murphy, University of Illinois at Urbana–Champaign, Urbana, IL, and approved November 20, 2018 (received for review September 6, 2018)
Article Figures & SI
Figures
- Fig. 1.
Spray-coating process for generating combinatorial libraries and ARES SWNT growth. (A) PPL array, made of polydimethylsiloxane (PDMS) on a glass slide, before inking, (B) dual spray coating of two different inks onto the PPL array to make compositional gradients, and (C) patterning combinatorial libraries of nanomaterials by mounting the PPL array on a piezo scanner. (D) Schematic of the ARES setup for laser-induced CVD growth of SWNTs from metal nanoparticles on Si micropillars patterned using PPL.
- Fig. 2.
Large-scale nanopatterned gradients of composition and size. (A) Stitched confocal fluorescence image of compositional and size gradients of two fluorophores in polymeric domes. (Scale bar: 2 mm.) (B) Average fluorescence intensity of each fluorophore across the array and (C) average total fluorescence intensity (blue curve) in the vertical axis plotted with the average volume of individual features as measured by AFM (red dots; error bars represent SD). (D) High-resolution dark-field micrograph of a region showing the patterns written by four pens. (Scale bar: 50 µm.) (E) Schematic of the airbrush position during spraying. (F) AFM of the largest patterned features (1.10 ± 0.02 µm) at the top of the array and (G) AFM of the smallest patterned features (642 ± 46 nm) at the bottom of the array. (Scale bars: 3 µm.)
- Fig. 3.
Patterning compositional nanoparticle gradients onto ARES micropillars. (A) Image of the pen arrays aligned with the ARES micropillars. (Scale bar: 50 µm.) (B) Dark-field optical image. (Scale bar: 50 µm.) (Inset) Four pillars with the nanodome polymer features in a square array on top of the micropillars. (Magnification: 2.2×.) (C) Compositional breakdown of 75% composition gradient across three 5-mm micropillar substrates.
- Fig. 4.
Compositional breakdown of catalytic activity. (A) Integrated intensity of the SWNT Raman G band as a function of catalyst composition for growths performed between 700 °C and 800 °C. Error bars represent SEM. Growths performed between 800 °C and 900 °C are plotted in SI Appendix, Fig. S11. The Gmax peaks around X = 0.75, suggesting Au3Cu as the composition that exhibits the highest catalytic activity for SWNT growth. (B) Representative Raman spectra from growths on ARES micropillars at five compositions normalized to the Si peak.
Data supplements
Supporting Information
Catalyst discovery through megalibraries of nanomaterials
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