noun, Biology. 1. an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement. Origin of tropism. 1895-1900. First recorded in 1895-1900; independent use of -tropism. Related forms. tropismatic.
Friction on as-grown graphene (Fig. 1c) is ultra-low and rather uniform with its magnitude close to the previous reports4. In contrast, friction on graphene after ï¬uorination becomes
Now a team of researchers has shown that graphene, when deposited on a germanium substrate covered with a thin germanium oxide layer, acquires excellent electrical properties, and its conductivity even improves compared to pure graphene.rying to understand better how the graphene-germanium interface modifies the properties of graphene is the next step for Cavallo and her colleagues. She says they'll modify the interface, removing the oxide and performing more chemical analysis to find out exactly what is going on..