Certain embodiments disclosed herein relate to the formation of multi-component oxide heterostructures using surface nucleation to pattern the atomic layer deposition of perovskite material followed by patterned etch and metallization to produce ultra-high density MCOH nano-electronic devices. The present disclosure also provides compositions and methods for facilitating the correct insertion of a sensor into a corresponding analyte meter. variable capacitor, having two or more tunable devices, e.