목차
1. 서론 1
2. 중공 나노튜브 구조 2
2.1. 중공 나노튜브 구조 3
2.2. 반구상의 중공 나노튜브 구조 4
3. 중공 볼 구조 5
3.1. 템플레이트를 사용하지 않고 제작된 중공 볼 구조 5
3.2. 금속 템플레이트를 이용한 중공 볼 구조 7
3.3. 폴리머 템플레이트를 이용한 중공 볼 구조 8
4. 결론 9
참고문헌 10
Table 1. List of bio-markers for a specific disease and comparison of the concentration between the healthy human breath and the patient breath. 1
Fig. 1. Hollow nanotube fabrication process using electrospinning. 3
Fig. 2. SEM micrographs of (a) as-spun PVAc fibers (left, nonaligned;right, quasi-aligned), (b) close-up image from a broken part of the fiber showing the as-deposited ZnO overlayer coating the electrospun PVAc fiber, (c) high magnification image of hollow ZnO fibers after calcination at 500 ℃,... 3
Fig. 3. (a) The resistance response R/R0 (=I0/I where I0 is the baseline current in dry air at the beginning of the measurement and I is the DC current at time t during the measurement) during cyclic exposure to increasing NO₂ concentrations at 350 °C of sensors comprising a network of nonaligned or quasi-aligned hollow ZnO fibers... 4
Fig. 4. Morphologies and crystal structures of pristine WO₃ nanotubes and Pt-functionalized WO₃ hemitubes: (a) cross-sectional SEM image of the sputtered WO₃ films on fiber templates, (b, c) SEM image of WO₃ hemitubes with different top wall thicknesses of 121 and 58.6 nm, respectively,... 5
Fig. 5. Gas sensor characterization: (a) response (Rair/Rgas) to H₂S gas at 300°C, (b) response of Pt catalyst decorated WO₃ hemitubes at 300°C, (c) response of pristineWO₃ hemitubes, (d) Pt-functionalized WO₃ hemitubesin the temperature range of 250-350 °C. 5
Fig. 6. Morphologies of the Fe₂O₃ hollow spheres after heat treatment at 500°C for 2 h: (a) low magnification SEM image, (b) high magnification SEM image of the rectangular area in (a), (c) TEM image of the hollow spheres, (d) TEM imageof a hollow sphere, (e) and (f) the Fe₂O₃ spheres after heat treatment at 500°C for 2 h.... 6
Fig. 7. Morphologies of Sn-precursor- or SnO₂-coated Ni spheres and NiO-functionalized SnO₂ hollow particles: (a) TEM images of Sn-precursor-coated Ni spheres, (b) SnO₂-coated Ni spheres after heat treatment at 400°C for 1 h, and (c-f) SEM and TEM images of SnO₂ hollow spheres prepared... 7
Fig. 8. (a) Dynamic C2H5OH sensing transient of NiO-functionalized SnO2 hollow spheres at 450℃, (b-c) 90% response and recovery times (tres and trecov) of the sensors. 8
Fig. 9. SEM images of hollow SnO₂ hemispheres: (a) plan view image of a monolayer of 2D-HCP array of SnO₂ hemispheres on a Si substrate, (b) tilted view image of a monolayer of SnO₂ hemispheres on an alumina substrate (the inset shows a high magnification plan view image),... 8
Fig. 10. The resistance response R/R0 (where R is the resistanceat time t during the measurement and R0 is the baseline resistance in dry air at the beginning of the measurement) during cyclic exposure to increasing NO₂ concentration in dry air at 250°C. 9