Document Type

Thesis

Date of Award

5-11-2022

Keywords

Nanoparticles, Silver, Copper, Sensor, Percolation, humidity, Hydroxyethyl, Cellulose, Nanoink, Semi-conductive

Degree Name

Biochemistry (BS)

First Advisor

Dr. Chuan-Jian Zhong

Series

Science and Mathematics

Subject Heading(s)

Metal nanoparticles; Silver-copper alloys; Ink

Abstract

Coinage metal nanoparticles remain an intriguing subject for research due to their industrial versatility. Primary applications of coinage metal nanoparticles include printed electronics, solar panels, and sensors. Inks formulated with the nanoparticles are conductive and thus useful for fabricating sensors. Silver-copper nanoalloy inks are viable for the fabrication of flexible sensing devices for the detection of volatile organic compounds. One of the challenges is the ability to synthesize composition-controllable alloy nanoparticles at room temperature through wet chemical methods and achieve controllable sintering at room temperature. This work addresses the challenges by investigating the room-temperature synthesis of silver-copper alloy nanoparticles and the
ink formulation with additives for controllable room-temperature sintering. Cellulose and other compounds derived from this natural polymer are explored for manipulating the ink viscosity and the electrical resistance. Results from the measurements of the electrical resistances of printed devices with the silver-copper nanoalloy inks of different concentrations of hydroxyethyl-cellulose additives and the responses to relative humidity changes will be discussed.

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