| 학회 |
한국재료학회 |
| 학술대회 |
2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 |
22권 2호 |
| 발표분야 |
E. 환경/센서 재료 분과 |
| 제목 |
Silver nanoparticles-anchored ZnO nanotube-based UV photodetector |
| 초록 |
This study deals with the effect of silver (Ag) nanoparticles (NPs) on the ultraviolet (UV) sensing performance of ZnO nanotubes (NTs). Here, ZnO nanorods (NRs) were synthesized by using a conventional low-temperature solution method, which were undergone chemical etching (ammonia solution) in order to achieve NT structure. After that Ag NPs were anchored on the NRs and NTs by using a simple room-temperature photochemical method. For anchoring Ag NPs, the ZnO samples were immersed in the equimolar aqueous solution of silver nitrate and trisodium citrate dihydrate and exposed to UV radiation. The time-period of the UV exposure and the solution concentration were optimized to obtain uniform Ag NPs. The size of the NPs was found to be uniform for 5 mmol solution with 15 min of UV exposure. The room temperature photoluminescence (PL) measurements were carried out by using IK3252R-E He-Cd (325 nm) laser source coupled with MonoRa 320i monochromator and Andor SOLIS simulation package. The PL spectra confirmed a resonance in the peak intensity in the UV region upon anchoring Ag NPs on the ZnO NTs. Metal-semiconductor-metal (MSM) devices were fabricated in order to investigate the UV sensing properties of the Ag NPs anchored NTs. The electrical measurements of the p-n heterojunction were performed by using semiconductor device analyzer (Agilent Technologies B1500A). The photodetectors with Ag NPs showed a clear enhancement in UV sensing properties. The higher efficiency was attributed to surface plasmon resonance of UV light by Ag NPs that were anchored on the NTs. |
| 저자 |
Pranab Biswas1, Sung-Doo Baek2, Jong-Woo Kim1, Seong Rae Cho2, Jae-Min Myoung1
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| 소속 |
1Department of Materials Science and Engineering, 2Yonsei Univ. |
| 키워드 |
silver nanoparticles; localized surface plasmon resonance; ZnO NTs; UV sensing
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| E-Mail |
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