Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Graphene has the potential for creating thin film devices, owing to its two-dimensionality and structural flatness. Assembling graphene-based building blocks into hybrid structures or composites with diverse targeted structures has attracted considerable interests for generating new properties and expanding its potential applications. The integration of graphene into a device always involves its interaction with supporting substrates, making this interaction critical to its real-life applications. This presentation will focus on three "graphene-on-surfaces" hybrid structures: I) Graphene-on-semiconductor: Graphene-on-Si can function as a quality Schottky junction with high photoelectric conversion. Graphene serves multiple functions as transparent electrode, active junction layer, hole collector and anti-reflection layer in graphene-on-semiconductor heterojunction photo-devices, such as solar cells and photodetectors, and could be extended to other optoelectronics; II) Graphene-on-polymer: Tiling structures are designed in graphene, composing overlapped graphene plates and realize high sensitivity strain sensing, which can measure either tiny or large strains with record high gauge factors. By combining artificial intelligence with digital signal processing, the graphene based sensing system represents a new smart tool to classify and analyze signals in fields of vital signs monitoring, robotics, fatigue detection, and in vitro diagnostics; III) Graphene-on-ceramic: Graphene oxide (GO)-based membranes are developed for highly efficient ion separation and water desalination. Due to the narrow dimension of nano-capillaries and the co-existence of sp2 aromatic channels with various oxygen functionalities, GO membranes can afford excellent selectivity towards various ions based on molecular sieving effect and diverse chemical interactions, showing promises in filtration and separation for water treatment applications.
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