DGIST Scholar: SynTheses of Cu@SnO2 Core@Shell Nanowires for Gas Sensing Application.

Department of Energy Science and Engineering Theses Master

Cited time in webofscience

Cited time in scopus

SynTheses of Cu@SnO2 Core@Shell Nanowires for Gas Sensing Application.

Title: SynTheses of Cu@SnO2 Core@Shell Nanowires for Gas Sensing Application.

Author(s): Hyeonjin Goh

DGIST Authors: Goh, Hyeonjin ; Lee, Youngu ; Jeong, Soon Moon

Advisor: 이윤구

Co-Advisor(s): Soon Moon Jeong

Issued Date: 2020

Awarded Date: 2020-02

Type: Thesis

Description: Core@shell nanowires, electroless plating, Cu@SnO2 nanowires, solution-processability, room temperature gas sensor

Table Of Contents: Ⅰ. Introduction
1.1 Core@shell NWs 1
1.1.1 Core@shell NWs 1
1.1.2 Methods for synthesizing core@shell NWs 2
1.2 Material for gas sensing 3
1.2.1 Tin oxide(SnO2) for ammonia(NH3) gas sensing 3
1.2.2 Introduction of assistant materials for gas sensing 3
1.3 Brief explanation for research 4

Ⅱ. Theoretical Background
2.1 Copper nanowires (CuNWs) 5
2.1.1 SynTheses methods for CuNWs 5
2.1.2 Growth principle of CuNWs 7
2.1.3 Physical property control of CuNWs 10
2.1.4 Core@shell NWs 11
2.2 Methods for core@shell synTheses 13
2.2.1 Chemical vapor deposition (CVD) 13
2.2.2 Electrochemical deposition 15
2.2.3 Electroless solution-phase synTheses 17
2.3 Resistive gas sensors 19
2.3.1 Principles of gas sensing 20
2.3.2 Ammonia (NH3) gas sensors 21

Ⅲ. Experimental section
3.1 Chemicals and materials 24
3.2 SynTheses of CuNWs 24
3.3 SynTheses of Cu@SnO2 core@shell NWs 25
3.4 Fabrication of gas sensor and measurement 25
3.5 Characterization 26

Ⅳ. Results and Discussion
4.1 Cu@SnO2 core@shell NWs 27
4.1.1 SynTheses of Cu@SnO2 core@shell NWs 27
4.1.2 Control of shell thickness of Cu@SnO2 core@shell NWs 29
4.1.3 Analysis of crystallinity and composition 34
4.2 NH3 gas sensor based on Cu@SnO2 core@shell NWs 36
4.2.1 Fabrication of gas sensor based on Cu@SnO2 core@shell NWs 36
4.2.2 NH3 gas sensitivity of Cu@SnO2 core@shell NWs 38
4.2.3 Principle of enhanced NH3 gas sensitivity of Cu@SnO2 core@shell NWs 44

Ⅴ. Conclusion 46

References 47
Summary (in Korean) 52