Roya Maboudian (Advisor)

Tin (IV) oxide-supported Pd is a promising heterogenous catalyst for CO oxidation relevant for environmental cleanup reactions. In this study, atomically dispersed catalyst Pd on SnO2 (ADC Pd/SnO2) hybrid material is successfully synthesized via a straightforward wet chemistry method and is found to exhibit superior performance toward CO sensing. Ex-situ EXAFS analysis confirms the formation of single Pd atoms and small Pd nanoclusters stabilized on the SnO2(110) surface. The material exhibits high efficiency in generating adsorbed O2– as well as high activity in catalyzing CO oxidation at...

Atomically dispersed metal catalysts have garnered considerable attention due to their unique properties and superior catalytic activity. The isolation of metal atoms on the matrix offers enhanced catalytic performance even with a small content of noble metal loading. This class of materials provides exciting opportunities to improve the performance of chemical and biochemical sensors. In this work, we have selected Pd as the catalysts because of its high catalytic activity and graphene oxide as the matrix because of its high electrical conductivity and unique electrochemical properties....

Long-term stability of chemiresistive gas sensors is essential for their use in industrial and residential safety and air-quality monitoring systems. Incorporation of noble metals into the gas sensors has been proved to be an effective strategy to enhance their sensitivity and selectivity. However, noble metal particles are prone to poisoning, resulting in catalyst deactivation. Atomically dispersed supported metal catalysts constitute a new class of materials that contains isolated individual atoms or synergistically coupled few-atom ensembles dispersed on, and/or coordinated with...