Crystallized indium-tin oxide (ITO) films were coated onto single-walled carbon nanotubes (SWCNTs) using nanocluster deposition (NCD) at 250 degrees C to prepare gas sensors and counter electrodes for use with dye-sensitized solar cells (DSSCs). Even at room temperature, the ITO/SWCNT composites operated well as a sensor for NO gas at 10 ppm. The ITO/SWCNT composites were suitable for counter-electrode of DSSCs, because transparent ITO conducting oxide films spontaneously formed between the composites and the bare glass in addition to coating onto the SWCNTs. The integration of the Pt/ITO/SWCNT composites as counter electrodes was resulted in an overall power conversion efficiency of approximately 5.1%. Using NCD technology to coat transparent ITO onto the SWCNTs at a low temperature allowed the development for applications as gas sensors and as counter electrodes for SSCs. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.048205jes]