A bilayer graphene nanoribbon based strain sensor is designed and investigated via first principles simulations. The interlayer sliding induces dramatically oscillation of current in order of several magnitudes. Electronic structure analysis attributes this oscillation of current to periodic variation of HOMO-LUMO gap which comes from the periodic change of interlayer stacking configuration. This kind of behaviors could potentially be implemented in future strain sensor and other nanoelectronic devices.

The SnO ₂ /ZnO hierarchical heterostructures (HHSs) were synthesized via the microwave-assisted hydrothermal method, and the SnO ₂ /ZnO HHSs based sensor exhibited ultra-low detection limit of 2 ppb for detecting NO ₂ .