Room-Temperature Photodetectors and VOCs sensors based on Graphene Oxide – ZnO Nano-Heterojunctions

The rapid development of smart wearable electronics is driving the engineering of novel miniaturized sensing materials that can rapidly respond to very small changes in the concentration of biomarkers at room temperature. Carbon-based nanomaterials offer numerous attractive properties such as low resistivity, good mechanical robustness and integration potential, but lack a strong detection and transduction mechanism for the measurement of chemical molecules or photons. Here, we present a three-dimensional nanostructured architecture comprising of optimally integrated graphene oxide (GO) – ZnO heterojunctions for the room temperature sensing of volatile biomarkers. We show that this layout also provides excellent response to UV light showcasing its applicability as visible-blind photodetector. Notably, the optimal integration of well-dispersed GO nanodomains in a 3D ZnO network significantly enhances the room-temperature chemical sensitivity and light responsivity, while higher GO contents drastically worsen the material performance. This is attributed to the different roles of GO at low and high contents. Small amounts of GO lead to the formation of electron depleted nano-heterojunctions with excellent electron-hole separation efficiency. In contrast, large GO amounts form a percolating electrical network short-cutting the light and chemical-sensing ZnO nanoparticles. Our optimal GO-ZnO demonstrates 33 AW-1 responsivity to UV light as well as the room temperature detection of down to 100 ppb of volatile organic compounds. We believe that these findings provide guidelines for the future engineering of hybrid carbon-metal oxide devices for application extending from optoelectronics to chemical sensing and electrocatalysis.