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Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges
นักวิจัย : Liu, Yejing , Pedireddy, Srikanth , Lee, Yih Hong , Hegde, Ravi S. , Tjiu, Weng Weei , Cui, Yan , Ling, Xing Yi
คำค้น : DRNTU::Science::Physics
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2557
อ้างอิง : Liu, Y., Pedireddy, S., Lee, Y. H., Hegde, R. S., Tjiu, W. W., Cui, Y., et al. (2014). Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges. Small, 10(23), 4940-4950. , 1613-6810 , http://hdl.handle.net/10220/24660 , http://dx.doi.org/10.1002/smll.201401242
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Small
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

A major challenge in plasmonic hot spot fabrication is to efficiently increase the hot spot volumes on single metal nanoparticles to generate stronger signals in plasmon-enhanced applications. Here, the synthesis of designer nanoparticles, where plasmonic-active Au nanodots are selectively deposited onto the edge/tip hot spot regions of Ag nanoparticles, is demonstrated using a two-step seed-mediated precision synthesis approach. Such a “hot spots over hot spots” strategy leads to an efficient enhancement of the plasmonic hot spot volumes on single Ag nanoparticles. Through cathodoluminescence hyperspectral imaging of these selective edge gold-deposited Ag octahedron (SEGSO), the increase in the areas and emission intensities of hot spots on Ag octahedra are directly visualized after Au deposition. Single-particle surface-enhanced Raman scattering (SERS) measurements demonstrate 10-fold and 3-fold larger SERS enhancement factors of the SEGSO as compared to pure Ag octahedra and non-selective gold-deposited Ag octahedra (NSEGSO), respectively. The experimental results corroborate well with theoretical simulations, where the local electromagnetic field enhancement of our SEGSO particles is 15-fold and 1.3-fold stronger than pure Ag octahedra and facet-deposited particles, respectively. The growth mechanisms of such designer nanoparticles are also discussed together with a demonstration of the versatility of this synthetic protocol.

บรรณานุกรม :
Liu, Yejing , Pedireddy, Srikanth , Lee, Yih Hong , Hegde, Ravi S. , Tjiu, Weng Weei , Cui, Yan , Ling, Xing Yi . (2557). Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Liu, Yejing , Pedireddy, Srikanth , Lee, Yih Hong , Hegde, Ravi S. , Tjiu, Weng Weei , Cui, Yan , Ling, Xing Yi . 2557. "Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Liu, Yejing , Pedireddy, Srikanth , Lee, Yih Hong , Hegde, Ravi S. , Tjiu, Weng Weei , Cui, Yan , Ling, Xing Yi . "Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2557. Print.
Liu, Yejing , Pedireddy, Srikanth , Lee, Yih Hong , Hegde, Ravi S. , Tjiu, Weng Weei , Cui, Yan , Ling, Xing Yi . Precision synthesis : designing hot spots over hot spots via selective gold deposition on silver octahedra edges. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2557.