Time-Resolved Indirect Nanoplasmonic Sensing Spectroscopy of Dye Molecule Interactions with Dense and Mesoporous TiO2 Films
Journal article, 2012

Indirect nanoplasmonic sensing (INPS) is an experimental platform exploiting localized surface plasmon resonance (LSPR) detection of processes in nanomaterials, molecular assemblies, and films at the nanoscale. Here we have for the first time applied INPS to study dye molecule adsorption/impregnation of two types of TiO2 materials: thick (10 mu m) mesoporous films of the kind used as photoanode in dye-sensitized solar cells (DSCs), with particle/pore size in the range of 20 nm, and thin (12-70 nm), dense, and flat films. For the thick-film experiments plasmonic Au nanoparticles were placed at the hidden, internal interface between the sensor surface and the mesoporous TiO2. This approach provides a unique opportunity to selectively follow dye adsorption locally in the hidden interface region inside the material and inspires a generic and new type of nanoplasmonic hidden interface spectroscopy. The specific DSC measurement revealed a time constant of thousands of seconds before the dye impregnation front (the diffusion front) reaches the hidden interface. In contrast, dye adsorption on the dense, thin TiO2 films exhibited much faster, Langmuir-like monolayer formation kinetics with saturation on a time scale of order 100 s. This new type of INPS measurement provides a powerful tool to measure and optimize dye impregnation kinetics of DSCs and, from a more general point of view, offers a generic experimental platform to measure adsorption/desorption and diffusion phenomena in solid and mesoporous systems and at internal hidden interfaces.

localized surface plasmon resonance

interface

Dye-sensitized solar cell

mesoporous titanium dioxide

indirect

sensitized solar-cells

Author

Viktoria Gusak

Chalmers, Applied Physics, Chemical Physics

Leo-Philipp Heiniger

Ecole Polytechnique Federale De Lausanne

Michael Graetzel

Ecole Polytechnique Federale De Lausanne

Christoph Langhammer

Chalmers, Applied Physics, Chemical Physics

Bengt Herbert Kasemo

Chalmers, Applied Physics, Chemical Physics

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 12 5 2397-2403

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Energy

Materials Science

Subject Categories

Materials Engineering

Physical Sciences

Nano Technology

Chemical Sciences

DOI

10.1021/nl3003842

More information

Latest update

5/3/2018 1