Graphene oxide chemiresistive and semiconductor gas sensors for CO and VOC detection**

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In this project, we will create functionalized Graphene-oxide membrane based interdigitated chemiresistive and semiconductor gas sensors. We will investigate new methods of 2D synthesis of graphene oxide films and membrane functionalization for selective gas detection at room temperature. To illustrate its commercial utility, we will conduct laboratory testing of the sensors alongside die encapsulation, and prototype packaging. ****The engineering design challenges include patterning thin film Graphene oxide on a custom interdigitated die. The graphene film needs to be chemically functionalized so it can be receptive to detecting a specific gas or volatile organic compound. While there are a few good reference recipes that offer a reasonable starting point, the exact requirements for the end user needs to be understood so that a robust multi-modal sensor is produced to reliably detect an alarm condition, in presence of detectable levels of the target gas. For the grapehen-FET gas sensor design, we will deposit thin film graphene over interdigitated source and drain electrodes, over a bottom gate-graphene oxide dielectric. In order to make graphene oxide selective to target gas molecules, functional groups will again be added through chemical modification.****These graphene oxide based gas sensors will facilitate room temperature detection of target gas molecules with ultra high sensitivity and selectivity, and offer a low-cost and longer lifespan alternative to the current commercial benchmark of electrochemical gas sensors. ******