Carbogenic nanoparticle-conducting polymer materials and inks for voc and moisture sensing, and methods of making and using the same

A method of making a thin film coated PCB comprising the steps of:

• treating the PCB under a UV lamp at about 260 nm to about 400 nm for about 15 minutes to about 60 minutes;
• and
• spin-coating the treated PCB with a carbogenic nanoparticle-conducting polymer composite ink comprising the steps of:
• i) horizontally positioning the treated PCB on a rotating disk of a spin-coating machine, under vacuum;
• ii) coating the substrate with a small amount of the composite ink;
• iii) rotating the coated PCB at one or more different speeds to obtain a first layer of composite ink on the PCB;
• and
• iv) optionally repeating steps ii and iii one to four times to obtain a double, triple, quadruple or quintuple layer of composite ink to make the thin film on the PCB.

A method of making a R-GO-conducting polymer composite ink comprising the steps of:

• a. Preparing graphene oxide (GO);
• b. Suspending the GO in water;
• c. Adding an iron (II) salt and a polymer having either a —COOH or a —SO3H group to the suspension to make an R-GO suspension;
• d. Acidifying the R-GO suspension;
• e. Adding a monomer of the conducting polymer to the acidified R-GO suspension to make a R-GO-conducting polymer composite suspension;
• f. Evaporating the composite suspension to reduce the volume to the composite ink.