Liwei Lin (Advisor)

Research Advised by Professor Liwei Lin

Lin Group:  List of Projects | List of Researchers

BPN892: Wearable Muscle Diagnostic System for Sports Monitoring Based On pMUT Arrays

Hong Ding
Yue Liang
2018

Muscle disorders, such as hematoma and atrophy, are major medical concerns stemming from the results of heavy muscles works such as intensive manual labors and physical exercises. For example, about 30% of sports injuries are related to muscles and it has been challenging to monitor the muscles usages and conditions with real-time feedback to avoid the extensive usages of muscles. From the perspective of availability, cost, and simplicity, ultrasonic imaging is a better route than technologies such as computed tomography (CT) and magnetic resonance imaging (MRI) for muscle disorder...

BPN774: Applications of 3D Printed Integrated Microfluidic Circuitry, Finger-Powered Pumps, and Mixers

Eric Sweet
Jacqueline Elwood
2019

In this ongoing project we have previously developed a new class of three-dimensional modular fluidic operators (i.e. fluidic diodes, capacitors and transistors); passive 3D internally- rifled mixers; and have previously demonstrated low- cost one-way pumping and mixing systems powered solely by the operator’s finger. In this semesters presentation we feature a 3D printed micromixer-integrated microfluidic gradient generator for antibiotic screening. Every year, more than twenty thousand people in the United States die from antibiotic- resistant bacterial infections. Despite...

BPN846: 3D Printed Biomedical and Diagnostic Systems

Eric C. Sweet
Nathaniel Liu
Reed Vickerman
2019

This work presents a novel handheld, manually-actuated microfluidic prototype designed for on-site colorimetric detection of infectious pathogens in drinking water. We have also developed a custom drop-casting protocol we use to pre-load the entirely 3D printed device, fabricated via ultra-high resolution additive manufacturing technology, with colorimetric enzymatic reagents and bacteria-specific nutrients, which we use to experimentally detect Escherichia coli (E. coli) bacteria in model drinking water, as well as to determine a limit of detection of 1e6 cfu/mL of E. coli in 6...

BPN782: Flexible Load-Bearing Energy Storage Fabrics

Renxiao Xu
Yuanyuan Huang
2019

The power source is a bottleneck for the successful development of flexible electronics. Instead of using rigid and bulky batteries, flexible multifunctional devices that store energy and bear loads at the same time provide better solutions by working as powering structural components. Here we demonstrate the woven supercapacitor fabrics featuring high flexibility comparable to that of wearable textiles, high tensile strength of over...

BPN860: Laser Printed Carbide-Graphene for Paper Electronics

Yu Long
Minsong Wei
Renxiao Xu
Junwen Zhong
Peisheng He
Fanping Sui
2019

Paper electronics have attracted researchers’ attention in recent years for its potential advantage of disposability, foldability, low density and low cost. In our previous studies, we have shown a drastically different approach by a direct-write laser patterning process on paper to realize various basic device applications, such as a foldable triboelectricity generator and a folded supercapacitor as the potential paper-based power source for paper electronics, a wireless...

BPN772: Graphene for Room Temperature Gas Sensors

Takeshi Hayasaka
Zhichun Shao
Vijay Kumar
Ritu Malik
2019

As air pollution from industrial and automobile emissions becomes more and more severe, a personalized, integrated, gas sensor is desirable for everyone to monitor everyday air quality, as well as their personal health condition noninvasively. Such sensors should have desirable features like energy efficiency, miniature size, accurate response (down to ppm level), and selectivity. Traditional bulk MOX-based gas sensors work in the temperature range of 300C to 400C,...

Toward A Levitated Micromechanical Resonator

Ilya Gurin
Clark T.-C. Nguyen
Liwei Lin
2010

Capacitive micromechanical (MEMS) resonators promise to dramatically improve the design of RF frontends for wireless communications by virtue of their high quality factor (Q). Unfortunately, the physical limitations of MEMS resonators’ Q are poorly understood, and the highest Qs have proven difficult to achieve reliably. In order to further...

Textile Supercapacitor for Wearable Energy Storage

Dongwoo Shin
Liwei Lin
Samuel Mao
2018
In today’s world, portable electronics are an integral part of our lives. For example, with a mobile phone, we wake up in the morning, read the news, communicate, send and receive emails, listen to music, diagnose health issues and capture important fleeting moments in photos and videos. We no longer carry heavy stacks of documents and books but hold on to our laptop and wear an electronic watch not merely to know the time, but to monitor and record our health in realtime even while...

Stability, Sensitivity, and Selectivity of Graphene FET-based Gas Sensors

Takeshi Hayasaka
Liwei Lin
Dorian Liepmann
Ana Claudia Arias
2019
Miniaturized gas sensors are expected to witness a high demand in the next decade invarious industry fields due to the small foot print, low power consumption, and low manufacturing cost. To date, various miniaturized gas sensors have been proposed by combining key sensing principles/materials and micro/nano fabrication technologies. Among those platforms, graphene-based gas sensor is especially promising due the unique features: gas sensing capability at room temperature, unique electrical properties, and the truly two...

Silicon and Silicon Carbide Nanowires: Synthesis, Characterization, Modification, and Application as Micro-Supercapacitor Electrodes

John Paul Alper
Roya Maboudian
David B. Graves
Liwei Lin
2014
For applications in mobile and remote sensing platforms, microsupercapacitors are attractive energy storage devices due to their robust lifetimes and high specific power capacity. Utilization of green electrolytes in these devices reduces environmental impact and simplifies packaging by avoiding the stringent oxygen and moisture free conditions required for organic and ionic liquid based electrolytes. Porous silicon...