A classic challenge in gas sensing is tunability of the sensing material for the selective absorption of target gases without interference from unwanted species. Metal-organic frameworks (MOFs), made up of metal-cluster nodes connected by organic linkers, achieve selective adsorption owing to their high chemical and structural tunability. Covalent-organic frameworks (COFs) prepared with only organic components linked by covalent bonds provide another class of tunable adsorptive materials. Their selectivity and flexibility make MOFs and COFs attractive for gas sensing, as realized in novel low-footprint, on-chip devices such as the chemical-sensitive field-effect transistor, previously demonstrated by our group. In this project, we aim to further develop highly selective MOF- and COF-based electronic sensors by investigating the underlying electronic transduction mechanisms of MOFs and COFs through impedance spectroscopy, X-ray photoelectron spectroscopy, and infrared and Raman spectroscopies. By leveraging MOFs and COFs in conjunction with hydrophobic self-assembled monolayers, such as octadecyl-trichlorosilane (OTS), we are engineering robust electronic sensors that are resistant to interference from ambient humidity.