geoffkait - Based on what I've read, as you indicated, graphene oxide is not conductive in and of itself. However, it can be made conductive with distilled water which is much cheaper than pure graphene. Here are excerpts from what I have read:
GRAPHENE OXIDE NANOFLUIDS CHARACTERIZATION AND ELECTRICAL CONDUCTIVITY
K. SAKTIYARAMANA*, G. AZADEH, M. T. HAJIBEIGY
School of Engineering, Taylor’s University, Taylor's Lakeside Campus, No. 1 Jalan Taylor's, 47500, Subang Jaya, Selangor DE, Malaysia
*Corresponding Author: Saktiya.karu@gmail.com
Abstract
Recently Graphene Oxide (GO) Nanofluids has become one of the emerging topics discussed in engineering applications due to its favourable characteristics in thermal and electrical conductivity. The substance is a combination of nano-size particles of graphene oxide dispersed in a base fluid, commonly distilled water. ..... In terms of electrical conductivity enhancement it was shown that samples with 0.03% volume fraction of graphene oxide had the highest electrical conductivity with a value of 161.44 μS/cm. The ability of the colloidal suspension to conduct electricity is basically due to the formation of dielectric layer and the presence of surface charges around the nanoparticles. In terms of electrical conductivity enhancement of the base fluid, sample with volume faction of 0.03% produces an enhancement value of 106%. The samples did not show any significant enhancement when the temperature is manipulated.