Solar lasing assisted reduced graphite oxide (rGO)/poly-(methyl methacrylate) (PMMA) based piezo-resistive smart nanostructured sensor and wearable flexi-electronic devices

Abstract

Reduced graphite oxide (rGO) based smart sensor is promising for the detection of structural strain sensing, fatigue monitoring, impact drop sensing, crack sensing and human physiological sensing action owing to its extremely large surface to volume ratio, high sensitivity and tensile strength. However, maximum commercial based sensors suffered from non-uniformity and sensitivity in their response towards dynamic and human physiological action. Such a reliable and high sensitize reduced graphite oxide polymer nanocomposite spray coated sensor shows good piezo-resistive behaviour and it is reported that the green synthesis of photo reduction-based graphite oxide shows good sensitivity in their response towards dynamic sensing and wearable devices. Such a reliable and highly sensitize based solar assisted green technology sensor has not yet studied in deeper level for multi-sensing applications. In this study, graphite oxide is obtained by intercalating graphite with molecular diffusion to KMnO₄-H₂SO₄₋NaNO₃, called as Hummer’s method. Then graphite oxide is made up to undergo solar exfoliation for conversion into reduced graphite oxide. This is the latest and most unique clean green synthesis method for smart piezo-sensor development approach. Electrical and piezoresistive behaviour of these sensor is studied upon structures and body locomotion. I report the comparative study of rGO/PMMA with SEM, Raman Spectroscopy, XRD-analysis, EDAX with commercial based GNP (graphene nano-platelet) sensor in terms of morphology confirmation. A unique design for solar exfoliation has been implemented with the help of steeper motor control mounted with convex lens. Our solar reduction-based sensor may replace commercial based low sensitive sensor in future.