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http://hdl.handle.net/11375/28241Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Deen, Jamal | - |
| dc.contributor.author | Siddiqui, Junaid | - |
| dc.date.accessioned | 2023-01-19T16:46:59Z | - |
| dc.date.available | 2023-01-19T16:46:59Z | - |
| dc.date.issued | 2022 | - |
| dc.identifier.uri | http://hdl.handle.net/11375/28241 | - |
| dc.description.abstract | Chlorine is used as a powerful disinfectant in water-related industries and in the food industry to remove bacteria and other harmful contaminants. We present a solution-based fabrication process for a biodegradable electrochemical free chlorine sensor using asparagine that is functionalized onto graphene oxide (GO). An ink solution of the GO functionalized with asparagine was fabricated then deposited onto a screen-printed carbon electrode (SPCE) using a spin-coater. The sensor showed high a sensitivity of 0.30 μA ppm−1 over a linear range of 0 to 8 ppm with a hysteresis-limited resolution of 0.2 ppm, very high selectivity in the presence of commonly interfering ions, and an operating voltage well below the reduction potential of dissolved oxygen. The sensor response time to achieve a steady state was 50 s, and it showed little change in its drift response over 16 h and over a temperature range of 10 to 45 °C. From the development of the free chlorine sensor, over 9000 datapoints were collected and used for training a neural network model to quantify and characterize factors affecting the free chlorine sensor performance. A readout system was designed with a printed circuit board and an android app to simplify free chlorine sensing for an end user. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Biodegradable, Chlorine, electrochemical, sensors, solution, fabrication | en_US |
| dc.title | DESIGN OF BIOCOMPATIBLE ASPARAGINE-GRAPHENE OXIDE FREE CHLORINE SENSORS FABRICATED USING SOLUTION BASED PROCESSING | en_US |
| dc.type | Thesis | en_US |
| dc.contributor.department | Electrical and Computer Engineering | en_US |
| dc.description.degreetype | Thesis | en_US |
| dc.description.degree | Master of Applied Science (MASc) | en_US |
| dc.description.layabstract | Free chlorine is used to disinfectant sources of water, and eliminate pathogens. The World Health Organization (WHO) maintains strict amounts of free chlorine in water due to its widespread usage owed to its low cost and persistence in water systems. Too little, and it will not be an effective disinfectant, and too much and the high consumption of free chlorine increases the risk cancer or the formation of hazardous chemicals. Recently, free chlorine sensors that measure an electrical response proportional to the amount of free chlorine are gaining interest for fast, accurate, and repeatable measurements. This thesis focuses on the design, fabrication, and evaluation of these sensors made using biodegradable materials in a solution-based fabrication processes with the aim of working towards large-scale fabrication of a printable ink. First, we review the results achieved by the sensors within recent literature. Second, we present the design of a sensor that aims to achieve environmentally friendly goals and maintain competitive performance characteristics. The, the sensor is tested under various conditions with its performance quantified under different conditions. Third, the sensor is characterized using a neural network to measure its performance and identify sources of improvement for future designs. Finally, we incorporate the sensor with an android app to measure free chlorine in remote water systems. | en_US |
| Appears in Collections: | Open Access Dissertations and Theses | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2022November26_Manuscript_Committee_SiddiquiJ.pdf | 3.94 MB | Adobe PDF | View/Open |
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