Block-Copolymer-Templated Hierarchical Porous Carbon Nanostructures with Nitrogen-Rich Functional Groups for Molecular Sensing

Ya Sen Sun, Chien Fu Lin, Shih Ting Luo, Ching Yuan Su

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The self-assembly of a block copolymer offers access to micellar nanodomains with tunable dimensions and structural diversity through control of such molecular parameters as the volume fraction and molecular mass. We fabricated hierarchical porous carbon (HPC) nanostructures with bundles of aggregated nanospheres and with nitrogen-rich functional groups through pyrolysis of diblock copolymer micelles in multiple layers. The resultant HPC nanostructures with a considerable specific surface area serve as an excellent substrate for surface-enhanced Raman spectroscopy (SERS), coupled with fluorescence quenching, for molecular sensing of physically adsorbed Rhodamine 6G. The abundant nitrogen atoms terminating on the surface of HPC nanostructures play a critical role in promoting a large Raman enhancement generated via a chemical mechanism. Most importantly, the observed enhancement factors show a clear dependence on the mesoscale porosity within HPC nanostructures, indicating that the chemical enhancement can be steadily tuned with control over the interfacial areas as a function of the nanosphere size. The unique architecture of HPC nanostructures based on the construction of a building block of a well-defined network of core-shell nanospheres provides a new design strategy for fabricating SERS substrates.

Original languageEnglish
Pages (from-to)31235-31244
Number of pages10
JournalACS Applied Materials and Interfaces
Volume9
Issue number37
DOIs
StatePublished - 20 Sep 2017

Keywords

  • block copolymer
  • chemical mechanism
  • hierarchical porous carbon nanostructure
  • surface-enhanced Raman scattering
  • thin film

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