Al-doped ZnO 1 Aluminum 1 Annealing 1 Annealing environment 1 Average diameter 1 Decay time constant 1 Gas adsorption 1 High concentration Interstitials 1 Metal analysis 1 Metal semiconductor metal 1 Nanorod arrays 1 Nanorods 1 Oxygen 1 Oxygen adsorption 1 Photoconductive sensors 1 Photoconductivity 1 Seed layer 1 Sensors 1 Surface conditions 1 Surface properties 1 Ultra-violet 1 Vacuum 1 Zinc 1 Zinc oxide 1 Zinc oxide nanorod arrays 1