Dr. Tianyi Liu, Senior Research Associate at Brewer Science, will be presenting two presentations at 2024 MRS Spring Meeting and Exhibit.
Flexible Carbon Dioxide Sensors Based on Polyethyleneimine – A Study on Their Aging and Potential Solutions
Abstract:
CO2 sensors, being widely utilized in indoor air quality monitoring, ventilation systems, automotive emission control, and healthcare, can be constructed using various materials and technologies. In recent years, polymers have been considered a popular sensing candidate due to their low cost, outstanding processability, and excellent compatibility with other materials. Polyethyleneimine (PEI) is a polymer that can interact with CO2 molecules and generate measurable responses; thus, it’s been extensively explored in the development of CO2 sensors. Even though many researchers have studied the stability of pure PEI, there are few studies for their real applications (i.e., CO2 sensors) since it determines the sensor lifetime. Therefore, in this work, a systematic analysis of the screen-printed, PEI-based chemiresistive CO2 sensors was conducted with emphasis on the sensors’ aging behavior along with the mechanism. More importantly, we have demonstrated solutions to address the sensor aging by selecting the proper molecular weight PEI and doing the chemical modification on PEI. The produced sensors exhibit much better cycling stability compared to the control sample.
May 7, 2024
2:25pm – 2:40pm
Printable Self-powered Electrochemical Oxygen Sensor
Abstract:
Oxygen sensors have a wide range of applications, from monitoring respiration and oceanography to food and pharmaceutical industries. These sensors measure the oxygen concentration in a gas or liquid, typically air or exhaust gases, and play a crucial role in improving efficiency, reducing emissions, and ensuring safety and environmental compliance. Screen printing is a widely adopted method for producing energy storage devices, especially in printed electronics. It creates patterns of conductive materials, such as electrodes and current collectors, on various substrates. In this work, an electrochemical sensor was fabricated using printing technology for O2 detection at room temperature. This design consists of zinc metal as an anode and carbon-based material as a cathode. The oxygen concentration can be observed in terms of electrical signals. A complete product development process has been demonstrated, including material screening, hardware design, and sensor tests. The resultant sensor exhibits a fast response (T90 ~2.7 s) and high sensitivity. Furthermore, the sensor fabrication is an environmentally friendly process with minimized consumption of toxic materials, such as Pd, and release of pollutants.
May 7, 2024
8:00am – 8:15am
You can learn more about the event on the event webpage. If you are unable to attend the event but wish to learn more about these presentation topics, please submit a request at the bottom of this webpage.
