Plasmonic-Photonic Interference Coupling in Submicrometer Amorphous TiO2-Ag Nanoarchitectures

被引:14
|
作者
Hyam, Rajeshkumar S. [1 ]
Jeon, Jihoon [1 ,2 ]
Chae, Songhwa [1 ,2 ]
Park, Yong Tae [3 ]
Kim, Sung Jae [4 ]
Lee, Byeongchan [1 ]
Lee, Choongyeop [1 ]
Choi, Dukhyun [1 ,2 ]
机构
[1] Kyung Hee Univ, Dept Mech Engn, 1732 Deogyeong Daero, Yongin 446701, Gyeonggi Do, South Korea
[2] Kyung Hee Univ, Ind Liaison Res Inst, 1732 Deogyeong Daero, Yongin 446701, Gyeonggi Do, South Korea
[3] Myongji Univ, Dept Mech Engn, 241 Geumhak Ro, Yongin 449728, Gyeonggi Do, South Korea
[4] Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
关键词
TITANIUM-DIOXIDE; NANOTUBE ARRAYS; NANOPARTICLES; ENHANCEMENT; RUTILE;
D O I
10.1021/acs.langmuir.7b01080
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this study, we report the crystallinity effects of submicrometer titanium dioxide (TiO2) nanotube (TNT) incorporated with silver (Ag) nanoparticles (NPs) on surface-enhanced Raman scattering (SERS) sensitivity. Furthermore, we demonstrate the SERS behaviors dependent on the plasmonic-photonic interference coupling (P-PIC) in the TNT-AgNP nanoarchitectures. Amorphous TNTs (A-TNTs) are synthesized through a two-step anodization on titanium (Ti) substrate, and crystalline TNTs (C-TNTs) are then prepared by using thermal annealing process at 500 degrees C in air. After thermally evaporating 20 nm thick Ag on TNTs, we investigate SERS signals according to the crystallinity and P-PIC on our TNT-AgNP nanostructures. (A-TNTs)-AgNP substrates show dramatically enhanced SERS performance as compared to (C-TNTs)-AgNP substrates. We attribute the high enhancement on (A-TNTs)-AgNP substrates with electron confinement at the interface between A-TNTs and AgNPs as due to the high interfacial barrier resistance caused by band edge positions. Moreover, the TNT length variation in (A-TNTs)-AgNP nanostructures results in different constructive or destructive interference patterns, which in turn affects the P-PIC. Finally, we could understand the significant dependency of SERS intensity on P-PIC in (A-TNTs)-AgNP nanostructures. Our results thus might provide a suitable design for a myriad of applications of enhanced EM on plasmonic-integrated devices.
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页码:12398 / 12403
页数:6
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