Year: 2021
Type: dissertation
Abstract: The first part of the thesis presents the development of a flexible graphene strain sensor with liquid metal interconnects for structural health monitoring. The second part presents the development of miniature sensors for the detection of nitrate ions in plants, soils, and tile drainage water from crop fields. First, a flexible strain sensor is developed for concrete structural health monitoring. The sensor features a flexible interconnect design, where liquid metal is introduced into microfluidic channels for interconnection and wiring. This design allows enhancing overall flexibility and robustness. A unidirectional strain sensor and a multidirectional rosette strain sensor are developed. We demonstrate the use of the unidirectional strain sensor for structural health monitoring of curved concrete structures. The rosette strain sensor detects the amplitude and angle of a primary strain in a multidirectional strain field. Second, a CMOS-compatible solid-state nitrate sensor is built based on a chemically sensitive or ion-selective field-effect transistor technology. The sensor exhibits fast and sensitive responses to varying nitrate ion concentrations with high selectivity. The sensor is assembled into a porous shell that allows filtering debris from the original liquid samples, such as tile drainage water, soil water, plant sap, and diluted manure solution. Additionally, the sensor is also shaped to be a needle for in-situ measurement of in-planta nitrate. This plant sensor detects dynamic changes in plant nitrate concentration. The sensor is also used to monitor plant nitrate concentration in response to light intensity, irrigation, and fertilization.
Author: Yueyi Jiao
Institution: Iowa State University
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
SDG: Zero hunger
Open Access status: gold
Awards: G1122582264, G2020334996, Collaborative Research: BTT EAGER: A wearable plant sensor for real-time monitoring of sap flow and stem diameter to accelerate breeding for water use efficiency, IOWA STATE UNIVERSITY: NEW ROOTS AWARD.
CONTROL NUMBER: 1565-1543
TITLE: ''HIGH-THROUGHPUT, HIGH-RESOLUTION PHENOTYPING OF NITROGEN USE EFFICIENCY USING COUPLE IN-PLANT AND IN-SOIL SENSORS'', G2865263083, G3389362980, G4268958678, PAPM EAGER: Microfluidic Root Exudate Sampler with High Spatio-Temporal Sampling Resolution, G5620962805
OpenAlex ID: W4393304062