Development of flexible sensor based on carbon quantum dots for humidity monitoring

Name: Sarawut Kondee

LCSH: Kasetsart University -- Theses. M.Eng. (Civil Engineering) 2021.

LCSH: Kasetsart University. -- Department of Physics -- Theses.

LCSH: Quantum dots.

LCSH: Carbon dioxide.

LCSH: Citric acids.

Abstract: A flexible resistive-type humidity sensor based on N-type nitrogendoped carbon oxide quantum dots (NCQDs) is presented. The NCQDs were synthesized by using the simple hydrothermal method with reactions via citric acid and urea. The UV–vis, FE-TEM, and XPS analysis confirm successful doping of N atoms and the existence of oxygen-containing functional groups into carbon quantum dots with the homogeneous spherical structure. The NCQDs humidity sensor exhibits high humidity response, good repeatability, and high stability as well as linear response to humidity in the range of 20-90% RH. The humidity sensing mechanism has been in-depth investigated by self-consistent charge density-functional tight-binding (SCC-DFTB) including dispersion interaction. The SCC-DFTB reveals an important role of N doping with physisorption via a direct charge transfer sensing mechanism.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Chatchawal Wongchoosuk

Role: Thesis Advisor

Created: 2021

Modified: 2025-07-18

Issued: 2025-07-18

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2564/sarawut-kon-all.pdf

CallNumber: QC611.6.Q35 .S27

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Civil Engineering

Grantor: Kasetsart University

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