| 학회 | 한국재료학회 |
| 학술대회 | 2015년 봄 (05/14 ~ 05/15, 구미코) |
| 권호 | 21권 1호 |
| 발표분야 | E. 환경/센서 재료 |
| 제목 | Improved Gas Sensing performance of Large Area Tungsten Disulfide Nanosheets Synthesized by Atomic Layer Deposition using Silver Nanowires Functionalization |
| 초록 | Transition metal dichalcogenides (TMDCs) are layered materials (MX2: M = Mo, W; X = S, Se) have attracted great attention as a chemical vapor sensing materials with high sensitivity, owing to their very high surface-to-volume ratios and semiconducting properties. Even many TMDCs have been considered as a promising gas sensing materials, they have been mainly researched for fundamental gas sensing characteristics and rarely approached improving sensitivity and achieving selectivity. Some reports represented that introducing electrical doping of TMDCs offers superb sensitivity and low detection limit of sub-ppm by biasing large gate voltage up to 30 V. However, not only fabrication process is complicate but also power consumption can be increasing to achieve high performance sensors. Here, we fabricated high performance gas sensor using large area tungsten disulfide (WS2) synthesized using atomic layer deposition (ALD). The number of WS2 layer was controlled by controlling the number of ALD cycles. At low concentration of NO2 and acetone, the immediate response which is attributed to the change of conductivity of WS2 were exhibited. The WS2-based gas sensors show clear detection of NO2 and acetone down to 25 ppm and 0.5 ppm, respectively. We demonstrated that the WS2 exhibit p-type characteristics to react oxidizing gas (NO2) and reduction gas (acetone). Also, we demonstrated the gas sensing properties of silver nanowires (Ag NWs) -functionalized WS2. The doping effect and catalytic effect of Ag NWs provide improved response and stability. |
| 저자 | 고경용1, 송정규2, 김영준1, 최태진2, 박규남1, 신세라2, 박주상1, 이경훈2, 김종백1, 이태윤2, 김형준1 |
| 소속 | 1연세대, 2전기전자공학부 |
| 키워드 | <P>Transition metal dichalcogenides; Silver nanowire functionalization; Gas sensor</P> |
