Light -induced charge separation across bio -inorganic interface

Nada M. Dimitrijevic, Linda De La Garza, Tijana Rajh

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Rational design of hybrid biomolecule nanoparticulate semiconductor conjugates enables coupling of functionality of biomolecules with the capability of semiconductors for solar energy capture, that can have potential application in energy conversion, sensing and catalysis. The particular challenge is to obtain efficient charge separation analogous to the natural photosynthesis process. The synthesis of axially anisotropic TiO2 nano-objects such as tubes, rods and bricks, as well as spherical and faceted nanoparticles has been developed in our laboratory. Depending on their size and shape, these nanostructures exhibit different domains of crystallinity, surface areas and aspect ratios. Moreover, in order to accommodate for high curvature in nanoscale regime, the surfaces of TiO2 nano-objects reconstructs resulting in changes in the coordination of surface Ti atoms from octahedral (D2d) to square pyramidal structures (C4v). The formation of these coordinatively unsaturated Ti atoms, thus depends strongly on the size and shape of nanocrystallites and affects trapping and reactivity of photogenerated charges. We have exploited these coordinatively unsaturated Ti atoms to coupe electron-donating (such as dopamine) and electron-accepting (pyrroloquinoline quinone) conductive linkers that allow wiring of biomolecules and proteins resulting in enhanced charge separation which increases the yield of ensuing chemical transformations.

Original languageEnglish (US)
Pages (from-to)473-491
Number of pages19
JournalInternational Journal of Modern Physics B
Issue number4
StatePublished - Feb 10 2009
Externally publishedYes


  • Charge transfer complex
  • Extended charge separation
  • Phonon interactions
  • Titanium dioxide

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


Dive into the research topics of 'Light -induced charge separation across bio -inorganic interface'. Together they form a unique fingerprint.

Cite this