Roya Maboudian (Advisor)

Research Advised by Professor Roya Maboudian

Sikai Zhao

Visiting Scholar Researcher
Chemical and Biomolecular Engineering
Professor Roya Maboudian (Advisor)
Visiting Scholar 2021

Yong Xia

Visiting Scholar Researcher
Chemical and Biomolecular Engineering
Professor Roya Maboudian (Advisor)
Visiting Scholar 2021

BPN977: Metal-loaded Metal Oxide Nanocomposites for Electronic Gas Sensors (New Project)

Yaprak Ozbakir
Isaac Zakaria
2022

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...

BPN914: Elucidating Aging Mechanisms of Tin(IV) Oxide-based Gas Sensors

Isaac Zakaria
Yaprak Ozbakir
Veronica Arriaga
Steriling Cavanaugh
2022

Despite decades of study and deployment, chemiresistive gas sensors based on SnO2 suffer from baseline drift due to aging of the SnO2 sensing material. In this work, we investigate how repeated, simulated operation of SnO2-based sensors causes irreversible changes in the electronic sensing behavior of SnO2, quantified through the bulk and inter-grain resistance of SnO2 as measured by potentiometric impedance spectroscopy (PIS). In tandem, we apply powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to link the observed changes in the bulk and inter-grain...

BPN973: Functionalized-Carbon Reinforced Concrete Towards Low-Carbon Intensity Hydrogen Fuel and Smart Concrete

Stuart McElhany
Jeffrey Heo
2022

Global usage of concrete has tripled in the last 40 years,[1] and continues to grow rapidly, placing immense pressure on the environment while requiring its use for safe and effective infrastructure. Concrete accounts for roughly 10% of worldwide CO2 emissions annually. A promising method for directly reducing the CO2 emissions associated with concrete is through replacement of cement, the primary binding material in concrete, with a percentage of carbon, creating so called carbon-incorporated cement composites (CCC). Carbon may be sourced from the waste product of methane...

Anthony Hon

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

Anthony is currently a third-year undergraduate student in Professor Roya Maboudian's lab at the Unversity of California, Berkeley. He is pursuing a major in Chemical Engineering and a minor in Data Science, and is expected to graduate in Spring 2024.

BPN978: Hot Car Studies (New Project)

Anthony Hon
2022

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...

Jihoon Chung

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

BPN968: Metal-Organic Framework Based Triboelectric Nanogenerator for Self-Powered Gas Sensing

Jihoon Chung
Adrian K. Davey
Isaac Zakaria
2022

With the rise of interest in the Internet of Things (IoT), the need for low-power sensors for monitoring the working environment has been in spotlight. Considering the number of sensors required to provide real time monitoring, creating sustainable and self-powered sensors is essential. Triboelectric nanogenerator (TENG), which converts mechanical motion to electrical energy, is one of the most promising candidates for realizing self-powered sensors due to its sensitivity to surface material properties and ability to generate consistent signals depending on mechanical input. Here, we...