Temperature-responsiveness and antimicrobial properties of CNT-PNIPAM hybrid brush films

Katrina D. Pangilinan, Catherine M. Santos, Nicel C. Estillore, Debora F. Rodrigues, Rigoberto C. Advincula*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Temperature-responsive carbon nanotube (CNT)/poly(N-isopropylacrylamide) (PNIPAM) hybrid brush films were prepared by combining the layer-by-layer and surface-initiated polymerization (LbL-SIP) techniques. Atom transfer radical polymerization (ATRP) is employed for the preparation of PNIPAM polymer brushes. Antibacterial activity of the CNT/PNIPAM films are investigated against Exiguobacterium sp. AT1b and Exiguobacterium sibiricum strains. Dead assay results show high microbial inactivation on coated surfaces with CNT films, while very low microbial inactivation is observed in PNIPAM films at all temperatures tested. The CNT-PNIPAM films, on the other hand, have antibacterial properties below 32 °C, which is below the lower critical solution temperature (LCST), but allows biofilm formation above the LCST. Carbon nanotubes incorporated via layer-by-layer assembly in ultra-thin films with temperature-sensitive polymer brushes exhibit unique antibacterial properties tunable with temperature. These hybrid films are useful for actively preventing biofilm formation at various temperature conditions and can be employed as smart coatings.

Original languageEnglish
Pages (from-to)464-469
Number of pages6
JournalMacromolecular Chemistry and Physics
Issue number4
Publication statusPublished - 2013 Feb 25
Externally publishedYes


  • antibacterial
  • carbon nanotubes
  • poly(N-isopropylacrylamide)
  • polymerizations

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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