Fully Inkjet-Printed Gas Sensor for Wireless Communication Application

Fully inkjet printing technology promote the green process due to the advantage of high substrate selectivity, fast process, save material, low cost, and low annealing temperature for portable sensor applications. The project uses inkjet printed carbon nanotubes as the sensing layer embedded in the dipole antenna and balun to realize two sensing antennas. The impedance will be changed as sensing gas to shift the operating frequency of antenna. The embedded sensing layer in dipole antennas is achieved functional and small size, in order to meet light, thin, and compact size for anytime and anywhere wireless sensor detection. In the following is our proposed plan for two year project:1. Development and analysis inkjet-printed carbon nanotubes: the inkjet printing conditions such as drop spacing, multi-passes, and annealing temperature will be developed by electrical and physical analysis to achieve optimal parameters.2. Measured and calculated contact resistance of multilayer structure-silver/nanotube: Multipass printing CNT at the contact location to improve contact resistance, then measured and calculated silver/nanotube overlap areas to reduce contact resistance.3. Design, fabrication, and modeling inkjet-printed carbon nanotubes test key: implementation of two transmission lines for coplanar waveguide lines, microstrip lines and two capacitive resonators for open square loop resonator and interdigitated capacitance for measurements and model developed.4. Fabrication and implementation of dipole sensing antennas: inkjet printed sensing layer in the dipole antenna and balun to realize two dipole sensing antennas for gas sensing testing to achieve fully inkjet printed dipole sensing antenna.

Project ID:PB10708-1767
External Project ID:MOST107-2221-E182-042