Acoustic charge transport induced by the surface acoustic wave in chemical doped graphene

A graphene/LiNbO3 hybrid device is used to investigate the acoustic induced charge transport in chemicaldopedgraphene. The chemicaldoping ofgraphene via its physisorption of gas molecules affects thesurface acoustic wave(SAW)charge carrier transport in a manner different from electric field drift. That transport inducesdoping dependent macroscopicacoustoelectriccurrent. The chemicaldoping can manipulate majority carriers and induces uniqueacoustoelectric features. The observation is explained by a classical relaxation model. Eventually the device based onacoustoelectriccurrent is proved to outperform the common chemiresistor for chemicals. Our finding provides insight into acousticcharge carrier transport during chemicaldoping. Thedoping affects interaction of carriers withSAW phonon and facilitates the understanding of nanoscaleacoustoelectric effect. The exploration inspires potentialacoustoelectric application for chemical detection involving emerging 2Dnanomaterials.
Source: Applied Physics Letters - Category: Physics Authors: Source Type: research