Graphene Oxide for Sensing Applications

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Presentation transcript:

Graphene Oxide for Sensing Applications Christopher Jabczynski Mentor: Dr. Anthony Muscat – Chemical Engineering Lauren Peckler – Chemical Engineering Date: April 16, 2016 Location: Arizona Space Grant Symposium

Sensing the world around us… Determine changes in environment Accuracy Fidelity Reliability Reproducible results Reduced maintenance The Cardio MEMS wireless sensor. Image: IntelFreePress

Why Graphene oxide (GO)? Advantages One-atom thick carbon nanosheet Graphene is very resilient to Volatile Organic Compounds (VOC) GO has greater sensitivity to VOC than Graphene GO is feasible for large scale manufacturing X. Zhang, L. Wang, J. Xin, B. I. Yakobson, F. Ding, J. Am. Chem. Soc. 2014, 136, 3040.

GO Sensor Fabrication Suspension of Graphene particles was made in solution to create GO GO was drop cast onto substrate Dried casting was then annealed Graphene Oxide Suspension, Muscat Group G.O. Dropcast on SI substrate, Muscat lab Annealed G.O. on SI substrate, Muscat lab

Contacting on the Substrate Annealed GO was then contacted with silver paste Corner contacting was used 32 gauge magnetic wire was attached to the silver paste Four point, and other, contacting was investigated Corner contacting on G.O., Muscat lab Four point contacting on G.O., Muscat lab Four point probe tip from SP4, Muscat lab

Electrical system setup Contacted GO was wired to two source meters The systems was controlled via code written in Labview Wire was threaded through a stopper in a three neck flask to create a sealed space Keithly meter - 2700, Tektronik Corp.

system setup and testing System was connected to a Schenk line Sensor was isolated within the flask N2 and CO2 where used to cycle and purge the system Schenk line , A.S. Glasware Three neck flask, Muscat lab

Results - Data Resistance vs. time Initial measurement with N2 CO2 introduced

Results - Analysis Sensor baseline at -80 ohms Change from inert gas to organic – magnitude difference of 25 ohms Further cycling of CO2 and N2 showed trend toward the baseline

Conclusions Change in resistance was observed by adding CO2 to the N2 purged chamber Difference in temperature between gasses Possible thermal effects

Future Work Create control sensor without GO Investigate thermal effects Use glass to glass seal instead of rubber stopper

Acknowledgement NASA Space Grant Consortium University of Arizona Chemical Engineering Department Dr. Anthony Muscat Muscat group graduate students

Thank you!