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Characterization of Graphene Flower based composites and its Electronic applications

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Abstract
The performance of any Electronic device has relied on the availability of suitable
functional material. Like, wide band gap, high electron injection rate, easy availability,
low cost, high carrier concentration, low static dielectric constant and high electron
mobility are the required properties for materials to use in photovoltaic industry. Same
as for other electronic devices, especially, the performance of sensors is dependent on
the response of active materials used for sensing. Despite all efforts to develop new
materials, it still remains a challenge to have all the desirable aspects in a single
material. One of the simple, easy, and cost-effective ways to get novel functional
materials with improved properties for desired applications is to make composites of
selected materials.
In this work, Zinc oxide (ZnO), a transparent, wide bandgap n-type semiconductor and,
a unique structure of graphene named graphene flower have been used to make a
composite. A simple solution process approach has been used to make GrF/ZnO
composite. GrF/ZnO composite's morphological, elemental, and structural
characterizations were performed by field emission scanning electron microscope
(FESEM), Energy-dispersive spectroscopy (EDS), and x-ray diffractometer (XRD),
respectively.
This newly prepared GrF/ZnO composite was used as an active material for humidity
sensing. An ultra-sensitive humidity sensor has been demonstrated using Graphene
Flower and ZnO (GrF/ZnO) composite. The proposed humidity sensor was tested at the
humidity range of 15% to 86% relative humidity RH%. The demonstrated sensor has
shown a highly sensitive response to humidity, an average current change of
7.77μA/RH%. Also, the proposed sensor response was very stable, repeatable, ultrafast
response, and recovery time. Moreover, the demonstrated sensor was ultrasensitive
to normal human breathing, making it a promising candidate for health
monitoring applications.
Author(s)
Muhammad Saqib
Issued Date
2021
Awarded Date
2021. 2
Type
Dissertation
URI
https://oak.jejunu.ac.kr/handle/2020.oak/23483
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부 Electronic Engineering
Advisor
Kim, Woo Young
Table Of Contents
Abstract 3
Acknowledgement . 5
Abbreviations. 6
1. Introduction 9
2 Fabrication and characterization of ZnO and GrF-ZnO composite . 13
2.1 Materials 13
2.2 Preparation of ZnO thin films . 13
2.3 Preparation of GrF-ZnO composite. 14
2.4 Fabrication of humidity sensor 15
2.5 Device Characterization and Measurements . 17
2.5.1 ZnO and GrF-ZnO morphology characterizations. 17
2.5.2 EDS analysis of ZnO and GrF-ZnO. 21
2.5.3 XRD analysis of ZnO and GrF-ZnO 23
3 Electrical characterization of prepared humidity sensor based on ZnO and GrFZnO. 24
3.1 Experimental setup 24
3.2 Current response of prepared humidity sensors 26
3.3 Capacitance and Impedance response . 27
3.4 Current Vs Voltage at different RH% levels. 29
3.5 Response and Recovery of proposed sensor . 31
3.6 Stability test. 32
3.7 Applications 32
4 Comparison with previous work 34
4.1 Comparison of proposed work with other reported humidity sensors based on ZnO composite with graphene derivatives. . 3
4.2 Comparison of proposed work with other reported humidity sensors based on ZnO composite with other 2D materials 34
4.3 General comparison of proposed work with different graphene compositesbased
humidity sensors. . 35
5 Conclusion . 37
R eferences 38
Degree
Master
Publisher
제주대학교 대학원
Citation
Muhammad Saqib. (2021). Characterization of Graphene Flower based composites and its Electronic applications
Appears in Collections:
Graduate School of Industry > Electronic Engineering
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