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A method for producing large-area, low-temperature electronics on flexible substrates is developed in this paper. Randomly interconnected networks of single-walled carbon nanotubes are placed between electrodes. The carbon nanotube networks (CNN's) are electrically conductive over macroscopic dimensions and doped to behave like n- or p-type semiconductors with a effective field effect mobility of 10 cm2/Vs and an on/off current ratio of ∼ 104. The CNN's has an application at room temperature to flexible substrates through a liquid deposition.