표제지
목차
ABSTRACT 10
제1장 서론 12
제1절 PTAA 기반 가스센서 12
1. 유기반도체 기반 가스센서 12
2. PTAA 기반 가스센서 13
3. 연구 목적 13
제2절 Ox-SWCNT 기반 가스센서 15
1. Ox-SWCNT 15
2. 연구 목적 15
제2장 실험 16
제1절 재료 및 시약 16
제2절 소자 제작 17
1. PTAA 기반 가스센서 제작 17
2. Ox-SWCNT/GO 기반 가스센서 제작 19
제3절 시료 측정 20
제3장 결과 및 고찰 21
제1절 PTAA 기반 가스센서 21
1. 소자의 구조적 특징과 유기반도체의 두께에 따른 특성 분석 21
2. 가스 주입 전후의 전기적 특성 차이 분석 25
3. 유전체 표면 개질에 따른 특성 분석 27
제2절 Ox-SWCNT/GO 기반 가스센서 29
1. 가스센서 특성 29
2. 노즐 수에 따른 가스센서 특성 31
3. 표면의 기능성기에 따른 가스센서 특성 33
제4장 결론 35
참고문헌 37
국문초록 41
Table 1. Electrical characteristics of PTAA FETs based on different concentrations of PTAA, surface treatment, and device structure. VTH:... 22
Table 2. Summary of gas sensor performance. 23
Table 3. The field-effect mobility of PTAA FETs based on different concentrations of PTAA, surface treatment, and device structure before... 26
Figure 2-1. Fabrication steps for gas sensors based on (a) bottom-gate/top-contact FETs, and (b) bot-tom-gate/bottom-contact FETs. 18
Figure 3-1. A schematic diagram showing the operating mechanism of PTAA gas sensors based on (a) bottom-gate/top-contact FETs, and (b)... 21
Figure 3-2. Transfer characteristics of FETs based on different concentrations of PTAA (2.5 mg/ml, 5 mg/ml) and device structures... 24
Figure 3-3. Gas sensing characteristics of PTAA FETs based on different concentrations of PTAA and device structure by exposure to... 24
Figure 3-4. Transfer characteristics of PTAA FETs before and after NO₂ gas injection. VDS is fixed at -80 V.[이미지참조] 26
Figure 3-5. Transfer characteristics of FETs based on different surface treatment (bare, ODTS) and device structures (top-contact, bottom-... 28
Figure 3-6. Gas sensing characteristics of PTAA FETs based on different surface treatments and device structures by exposure to 50 ppm of NO₂:... 28
Figure 3-7. Selectivity of target gases. VDS is fixed at 0.01 V[이미지참조] 29
Figure 3-8. Extraction of LOD in SWCNT/GO sensor by linear regression analysis. VDS is fixed at 0.01 V[이미지참조] 30
Figure 3-9. Wearable sensor fabricated by knitting. Inset in e represents real image of the wearable sensor. VDS is fixed at 0.01 V[이미지참조] 30
Figure 3-10. Gas sensing characteristics of SWCNT/GO fibers under the exposure to 50 ppm NO₂ (grey regions) at the voltage of 0.01 V. Sensors... 31
Figure 3-11. SEM images of Ox-SWCNT which was wet-spun through (a) a single nozzle and (b) multi nozzle 32
Figure 3-12. Gas sensing characteristics of SWCNT/GO fibers at the voltage of 0.01 V : (a) Drain current and (b) Response under the... 34