Selective deposition of rod-like phthalocyanine aggregates on Au surfaces patterned with a combination of microcontact printing and electropolymerization

R. A P Zangmeister, D. F. O'Brien, Neal R Armstrong

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Patterned thin films of a unique phthalocyanine (Pc), (2,3,9,10,16,17,23,24-oktakis((2-benzyloxy)ethoxy)phthalocyaninato) copper (1), are created by means of capillary flow of chloroform solutions into micrometer-dimension hydrophobic/hydrophilic channels. These channels are created by a combination of microcontact printing of octadecylmercaptan (C18-SH) layers on gold, creating a hydrophobic channel bottom, and oxidative electropolymerization of m-aminophenol (at pH 4), creating hydrophilic channel walls (microcontact printing/electropolymerization, μCP-EP). The polyphenoxide channel walls grow perpendicular to the substrate plane, with excellent retention of structure to thicknesses (ca. 30 nm) far exceeding the height of the C18-self-assembled monolayer (SAM). Doping of the C18-SAM layers with small percentages of 1-phenyldodecane provides for efficient wetting of the channel bottoms with solutions of 1, consistent with recent studies, which have shown the need for phenyl-termination of substrates surfaces to create coherent rod-like aggregate structures. These optimized channels provide for excellent capillary flow conditions for chloroform solutions of 1, yielding 10 μm width Pc films with thicknesses exceeding the height of the polyphenoxide channel walls by up to 10×. We also present evidence for formation of birefringent (ordered) material near the hydrophilic walls.

Original languageEnglish (US)
Pages (from-to)179-186
Number of pages8
JournalAdvanced Functional Materials
Volume12
Issue number3
DOIs
StatePublished - Mar 2002

Fingerprint

Electropolymerization
printing
Capillary flow
Printing
rods
Self assembled monolayers
Chloroform
Chlorine compounds
Substrates
capillary flow
Gold
Wetting
Copper
chloroform
Doping (additives)
Thin films
phthalocyanine
wetting
micrometers
gold

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "Patterned thin films of a unique phthalocyanine (Pc), (2,3,9,10,16,17,23,24-oktakis((2-benzyloxy)ethoxy)phthalocyaninato) copper (1), are created by means of capillary flow of chloroform solutions into micrometer-dimension hydrophobic/hydrophilic channels. These channels are created by a combination of microcontact printing of octadecylmercaptan (C18-SH) layers on gold, creating a hydrophobic channel bottom, and oxidative electropolymerization of m-aminophenol (at pH 4), creating hydrophilic channel walls (microcontact printing/electropolymerization, μCP-EP). The polyphenoxide channel walls grow perpendicular to the substrate plane, with excellent retention of structure to thicknesses (ca. 30 nm) far exceeding the height of the C18-self-assembled monolayer (SAM). Doping of the C18-SAM layers with small percentages of 1-phenyldodecane provides for efficient wetting of the channel bottoms with solutions of 1, consistent with recent studies, which have shown the need for phenyl-termination of substrates surfaces to create coherent rod-like aggregate structures. These optimized channels provide for excellent capillary flow conditions for chloroform solutions of 1, yielding 10 μm width Pc films with thicknesses exceeding the height of the polyphenoxide channel walls by up to 10×. We also present evidence for formation of birefringent (ordered) material near the hydrophilic walls.",
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