Roya Maboudian (Advisor)

Research Advised by Professor Roya Maboudian

Maboudian Group:  List of Projects | List of Researchers

BPN973: Piezoresistive Cement Paste for Structural Health Monitoring

Stuart McElhany
2024

Concrete is the most widely used engineered material in the world and finds use in nearly every aspect of civil infrastructure. Safety concerns posed by the aging of infrastructure combined with the prevalence of concrete in these systems highlights the demand for a concrete-composite capable of structural health monitoring (SHM) while being low-cost and easily implementable. Embedment of electrically conductive forms of carbon such as graphitic fibers and nanotubes allow for concrete and other cementitious composites to act as self-sensors capable of SHM through a...

BPN995: Growth of Metal Organic Framework (MOF) Crystals under Microgravity and their Prospects for Chemical Sensing

Liam McDonough
Sai Munagavalasa
Yaprak Ozbakir
HyoJun Min
Pat Taedullayasatit
2024

Metal-organic frameworks (MOFs) are porous, high surface area materials that consist of metal-cluster nodes connected by organic linkers to form highly ordered structures with various pore geometries and chemical properties. Due to their unique and tunable structure, MOFs have shown substantial promise in a broad range of applications, including chemical sensing, gas adsorption and separation, and catalysis. To investigate the intrinsic properties of MOFs for their sensing performance, single crystals are ideal platforms that mitigate the impact of defects, impurities, and grain...

BPN994: Atomically Dispersed Supported Metal Catalysts for Robust Chemiresistive Gas Sensors

Yaprak Ozbakir
2024

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...

Jiawei Wang

Visiting Scholar Researcher
Chemical and Biomolecular Engineering
Professor Roya Maboudian (Advisor)

BPNX1003: Copolymer-Template Fabrication of Metal Oxides with Tailored Porosity toward High-performance Gas Sensors (New Project)

HyoJun Min
Yaprak Ozbakir
Carlo Carraro
Tzu Chiao Wei
2024

Metal oxide semiconductors (MOX) such as SnO2 are widely used in chemiresistive gas sensors due to their high chemical and thermal stability, low cost, and tunable chemical and electronic properties. The introduction of porosity to the MOX structure enhances their gas-sensing properties by increasing the surface area available for interactions with gas molecules. This higher surface area enhances the sensor's sensitivity by providing more active sites for gas adsorption. Also, a faster response/recovery time can be obtained as gas molecules can more quickly interact with a...

BPNX1002: Atomically Dispersed Metals on Graphene Oxide for High-Performance Electrochemical Biosensors (New Project)

HyoJun Min
Yaprak Ozbakir
Carlo Carraro
2024

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....

BPN978: Hot Car Studies: Preventing Child Vehicular Heatstroke

Anthony Hon
2024

Young children trapped in a car without adult supervision may suffer life-threatening complications such as hyperthermia and heat stroke from extreme temperatures—which may rise to 130 °F in some cases. Our research aims to ascertain child presence within two to three minutes of unsupervised activity by probing increases in the levels of carbon dioxide emitted during human exhalation. Non-dispersive infrared (NDIR) sensors are employed to measure car carbon dioxide concentrations every two seconds. Specific numerical metrics are then derived from the data, and the presence of a child can...

BPN977: Metal-Loaded Metal Oxide Nanocomposites for Electronic Gas Sensors

Tzu-Chiao Wei
Yaprak Ozbakir
Veronica Arriaga
Sterling Cavanaugh
Carlo Carraro
2023

Semiconducting metal oxides (MOX) such as SnO2 are an industry-standard material for chemiresistive sensing. However, many MOX-based gas sensors suffer from poor sensitivity, limited selectivity—particularly in the presence of water vapor—and insufficient stability. To address these shortcomings, catalytically active noble metals, such as Pd, are loaded onto the MOX materials to form noble metal-loaded MOX nanocomposites. In this work, we focus on Pd-loaded SnO2 (Pd/SnO2) due to their promising sensitivity to and selectivity for CO and CH4. Pd/SnO2 nanocomposites with varying Pd/Sn...

BPNX1001: Enhancing the Humidity Resistance of Chemiresistive Gas Sensors through Surface Functionalization (New Project)

Tzu Chiao Wei
Yaprak Ozbakir
HyoJun Min
2024

Chemiresistive gas sensors based on semiconductor metal oxides, such as tin dioxide, help to identify and monitor toxic gases and pollution, and play a vital role in industrial and environmental applications. However, the interfering effect of ambient humidity is a major challenge in their reliable operation, as water molecules on the oxide surface can affect the sensitivity and other characteristics of the sensor. To address this challenge, several surface modifications are being explored in this project. In one approach, we are utilizing atomic layer deposition (ALD),...

Pat Taedullayasatit

Undergraduate Researcher
Chemical and Biomolecular Engineering
Professor Roya Maboudian (Advisor)
B.S. 2024 (Anticipated)