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Photocatalytic Edge Growth of Conductive Gold Lines On Microstructured TiO2-ITO Substrates
Fatemeh Abshari1, Salih Veziroglu2,3, Blessing Adejube2
1Chair for Integrated Systems and Photonics, Department of Electrical and Information Engineering, Faculty of Engineering, Kiel University, Kaiserstr. 2, D-24143 Kiel, Germany.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 28, 2024
Summary
Researchers developed a new method for precisely depositing gold using titanium dioxide (TiO2) and an indium tin oxide (ITO) sublayer. This technique enables controlled, localized gold growth for advanced applications like neuromorphic engineering.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Titanium dioxide (TiO2) exhibits significant photocatalytic activity, enabling UV-controlled deposition of materials.
- Photocatalytic reduction of gold precursor ions on TiO2 surfaces leads to cluster formation and coalescence, resulting in complex gold structures.
Purpose of the Study:
- To investigate the effect of an indium tin oxide (ITO) sublayer on the photocatalytic growth of gold on TiO2.
- To demonstrate a method for localized gold deposition by manipulating electron pathways.
Main Methods:
- Fabrication of a microstructured thin film stack comprising ITO and TiO2 layers.
- UV-controlled photocatalytic deposition of gold from a tetrachloroauric solution.
- Comparative analysis of gold growth on TiO2 with and without an ITO sublayer, varying TiO2 thickness.
Main Results:
- Localized gold growth was achieved along the edge of patterned TiO2 areas when an ITO sublayer was present.
- A 3.8 μm high conductive gold line formed along the edge, with suppressed growth on the TiO2 surface.
- Effective steering of photogenerated electrons to the edge requires both an ITO sublayer and a thin TiO2 layer (70 nm).
- Thicker TiO2 layers (845 nm) resulted in dominant surface growth, irrespective of the ITO sublayer.
Conclusions:
- The combination of a conductive ITO sublayer and a thin TiO2 layer is crucial for localized photocatalytic gold deposition.
- This method offers a novel approach for controlled material deposition, with potential applications in neuromorphic engineering for creating dynamic conductive interlinks.
