Electronic properties of single walled carbon nanotube (SWCNT) thin films, have driven the development of potential electronic devices, such as high surface area sensors and flexible display screens. We have fabricated contiguous, uniformly thin SWCNT films. Once optimized, resistivity and photoconductivity of the films, are determined. These SWCNT films are made with varying thicknesses and transferred onto glass and silicon substrates. Sheet resistance of films has been measured using a four point probe and the corresponding resistivity values have been determined. Difficulties encountered thus far include the processing of contiguous nanotube films. Sheet resistance fluctuations are resultant from non-uniform film formation and contamination from various processing steps. Progress toward ideal film processing will be discussed. Functionalization of SWCNT films with ruthenium coordination complexes modulates photoconductivity. Potential sensor applications will be discussed.