Roya Maboudian (Advisor)

Research Advised by Professor Roya Maboudian

Maboudian Group:  List of Projects | List of Researchers

BPN424: Silicon Carbide Nanomaterials for Harsh Environment Applications

Lunet E. Luna

Silicon Carbide (SiC) is a material of interest to fabricate sensors and actuators able to operate in harsh environments. Particularly, its mechanical and electrical stability and its chemical inertness make SiC well suited for designing devices capable of operation in high temperature and corrosive environments. Harsh-environment stable metallization remains one of the key challenges with SiC technology. We are developing novel metallization schemes, utilizing solid-state graphitization, to improve the long-term reliability of Pt/Ti/poly-SiC contacts in high temperature environments...

BPN783: Low-Power Conductometric Soot Sensor with Fast Self-Regeneration

Ameya Rao

We are designing a conductometric soot sensor that measures the change in conductance resulting from soot deposition onto the sensor. Although previous work has been done on conductometric soot sensing, current sensors are power intensive (5-30 W) and slow (60-170 s between sensing cycles) due to their large size, ineffective thermal insulation, and the high currents required for soot combustion (when self-regenerating). We propose to use MEMS fabrication methods to develop a miniaturized conductometric soot sensor with a built-in polysilicon microheater for self-regeneration, whose...

BPN797: Synthesis and Friction Characteristics of Gecko-Inspired Adhesives

Hai Liu
JuKyung Choi
Gina Zaghi

Geckos have a remarkable ability to stick to and climb almost any type of surface using micro- and nanoscale foot- hairs, which allow conformal contact against any counter-surface and thus, maximize the interfacial interaction. With the goal of mimicking the high adhesion and friction capability of geckos, we have fabricated ordered polymeric nano-fiber arrays of various soft and hard polymers, including low-density polyethylene and cyclic olefin polymers. In order to provide a useful reference for optimum high performance conditions, the effects of fiber geometry (diameter and...

BPN819: Hybrid Porous Nanowire Arrays for High Energy Supercapacitor

Sinem Ortaboy

Recently, silicon-based supercapacitors have received considerable attention for application in mobile and remote sensing platforms due to their unique properties such as high surface area, low cost, long lifetimes, and excellent charge–discharge capability. These promising energy storage devices store more energy than conventional dielectric capacitors and deliver higher power with longer cycle life than available battery technologies. Recent studies in the field of supercapacitors have focused on the realization of hybrid materials to further improve the energy density of...

BPN762: Microheater-Based Platform for Low Power Combustible Gas Sensing

Anna Harley-Trochimczyk

Accurate detection of flammable gases is essential for safe operation of many industrial processes. Installing networks of combustible gas monitors in industrial settings can allow for rapid leak detection and increased safety and environmental protection. However, existing combustible gas monitors are not suitable for use in wireless sensor networks due to the high power consumption. We have developed an ultra-low power combustible gas sensor with competitive sensitivity and lifetime characteristics that will enable ubiquitous wireless monitoring of combustible gases in industrial...

BPN786: NanoPlasmonics for Sensing and Energy

Arthur O. Montazeri

Controlling and concentrating infrared radiation has the potential to significantly impact infrared sensors, thermal imaging devices, as well as heat conversion systems. As most molecules have vibrational modes in the infrared range, they reradiate a great portion of the incident radiation instead of efficiently transmitting it. As a promising alternative, plasmonic gratings not only offer low-loss transmission of infrared radiation, but also compress the long infrared wavelengths. This localization effect greatly improves the sensing resolution and offers high-intensity fields at...

BPN837: Metal Oxide-Coated Carbonized-Silicon Nanowires as High-Performance Micro-Supercapacitor

Yuan Gao
Sinem Ortaboy
Chuan-Pei Lee

With the rapid development of modern digital technology, micro-supercapacitors show tremendous potential to complement or replace conventional electrolytic capacitors and batteries due to their small dimension, high power density, high electrochemical efficiency and long cyclic life. In particular, porous silicon nanowires (PSiNWs) and their derivatives have attracted great attention owing to their high surface areas and ease of integration with the microfabrication methodology. In this project, we are developing a novel metal oxide-coated carbonized PSiNWs electrodes for micro-...

BPN827: Metal Oxide-decorated Silicon Carbide Nanowires Electrode for The Applications on Electrochemical Energy Storage

Chuan-Pei Lee
Steven DelaCruz

Since the discovery of electricity, we are looking for promising methods to store that energy for use on demand. In the energy storage industry, electrochemical water splitting is a well-established technology to convert electricity into chemical energy, addressing the issues of effective storage and transport. On the other hand, electrochemical capacitors, namely supercapacitors, have also attracted much attention for electrical energy storage because of their feature of both high power density and energy density. In this work, we are developing processes for the synthesis of metal...

BPN842: Conductometric Gas Sensing Behavior of WS2 Aerogel

Wenjun Yan

The gas sensing characteristics of a high surface area tungsten disulfide (WS2) aerogel are investigated. Gas sensors are fabricated by integrating a low-density WS2 aerogel onto a low power polysilicon microheater platform to provide control over the operating temperature. The response of the WS2 aerogel-based sensors to NO2, O2, and H2 is investigated with the sensing characteristics indicating p-type behavior. The optimum sensing temperature is found to be about 250 ℃;, when considering sensitivity, power consumption and response time. The role of O2 in H2 and NO2 sensing is...

BPN834: Direct Formation of Pore-Controllable Mesoporous SnO2 for Gas Sensing Applications

Won Seok Chi
Hu Long

Amphiphilic graft copolymer self-assembly provides an effective method to create mesoporous structures that can act as templates for the synthesis of inorganic materials with controlled morphology. In this project, we are using PVC-g-POEM graft copolymer as a template for mesoporous SnO2 fabrication directly onto a microheater platform for gas sensing applications. The sol-gel solutions are composed of PVC-g-POEM and SnO2 precursor with tunable composition allowing the formation of various structures with controllable pore size, and surface area. The mesoporous SnO2 structure is...