Eddy Current Measurement of Chemiresistive Sensing Transients in Graphene-hBN Heterostructures

The development of graphene-based electronic and gas sensing devices has motivated considerable research interest in the properties of graphene-hBN heterostructures. Eddy current measurements of the sheet conductance of graphene-hBN heterostructures show a relatively low conductance, as compared to results previously reported in the literature, all of which were obtained using contact-based measurement methods. Chemiresis-tive measurements of the graphene-hBN heterostructure response to oxygen adsorption, including hysteric effects under transient multicycle loading, show that the incremental sheet conductance responses of graphene and graphene-hBN sensors differ in sign. A transient, nonlinear, history dependent constitutive model of graphene-hBN response to oxygen adsorption distinguishes stochastic variations in material properties from deterministic variations in sensor performance. The deterministic variations are due to sensing process hysteresis, a phenomenon of central interest in the development of graphene-based sensor systems.

Automated summary

The development of graphene-hBN heterostructures in electronic and gas sensing devices has sparked research interest. Eddy current measurements show lower sheet conductance in graphene-hBN heterostructures compared to previously reported results obtained through contact-based methods. Chemiresistive measurements reveal different incremental sheet conductance responses and sign variations in graphene and graphene-hBN sensors during oxygen adsorption, highlighting the importance of hysteresis in sensing processes.