We present a new method for vapor deposition of columnar ZnO structures in the form of rods on various substrates without the need for substrate modification with catalyst seed particles and at relatively low temperatures compared to other vapor deposition methods. These structures are used for the photodegradation of stearic acid (C18H36O2) and the photoactivated detection of gases such as carbon monoxide (CO), ethanol (C2H6O), toluene (C7H8), and nitrogen dioxide (NO2) at room temperature, showing improved selectivity compared to tests performed in themoactivated mode.

Department of Chemistry University College London 20 Gordon Street London WC1H0AJ U K

Institute of Physical Engineering Central European Institute of Technology Brno University of Technology 2896 2 Technická 61669 Brno Czech Republic

Institute of Physics of Material Academy of Sciences of Czech Republic 22 Zizkova 61662 Brno Czech Republic

Instituto de Microelectrónica de Barcelona Consejo Superior de Investigaciones Científica Campus UAB 08193 Bellaterra Barcelona Spain

SIX Research Centre Brno University of Technology 10 Technická 60190 Brno Czech Republic

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