DGIST Scholar: Electronic Nose based on Transistor with Polymer Films

Department of Electrical Engineering and Computer Science Theses Master

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Electronic Nose based on Transistor with Polymer Films

Table Of Contents: Ⅰ. INTRODUCTION 1
1.1 Motivation 1
1.2 Human olfactory system 2
1.2.1 Human nose receptors 2
1.2.2 Human nose receptors array 4
1.3 Multi-array sensor 6
1.4 E-nose based on polymer 7
1.4.1 Polymer application 7
1.4.2 Mechanism of sensing with non-conductive polymer 8
1.4.3 Mechanism of interaction with odorants 10
1.5 E-nose based on transistor 12
Ⅱ. EXPERIMENTAL DETAILS 13
2.1 Device structure and concept 13
2.2 Device material 15
2.3 Device fabrication 15
2.4 Measurement systems 19
Ⅲ. CHARACTERISTICS OF α-IGZO TFT AND E-NOSE WITH POLYMER FILMS 21
3.1 Electrical characteristics of the α-IGZO TFT with polymer films 21
3.2 Odorant response of the α-IGZO TFT and the α-IGZO TFT with polymer films 24
Ⅳ. THE METHOD FOR ENHANCING THE CHRACTERISTICS OF E-NOSE 25
4.1 Enhancement of the sensitivity 25
4.1.1 Advantage of the 3-terminal device 25
4.1.2 Control of the polymer’s thickness 27
Ⅴ. PERFORMANCE OF ELECTRONIC NOSE 30
5.1 Classification of interaction between polymer films and odorants 30
5.1.1 Category of interaction 30
5.1.2 Odorant sensing performance of E-nose for 8-odorants 31
5.1.3 Selectivity of the α-IGZO TFT with polymer films 44
5.1.4 The result of multi-array sensor in saturation region 51
Ⅵ. CONCLUSION 52