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- 저자 : Zhengkun Qin (검색결과 2 건)
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Up-Conversion Nanoparticles/PMMA Composites for Light-Emitting Applications
Yongling Zhang,Peng Lv,Xiang Liu,Haoyuan Chi,Guoqing Xi,Zhengkun Qin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.03
In this paper, we prepared KMnF3:Yb3+, Er3+ nanoparticles (NPs)/polymethyl methacrylate (PMMA) composites, NaYF4:Yb3+, Tm3+NPs/PMMA composites and NaYF4Yb3+, Er3+NPs/PMMA composites by in situ polymerization, and these NPs/PMMA composites can emit red, blue and green up-conversion fluorescence excited by 980nm, respectively. The mixed white NPs/PMMA composites were obtained by adjusting the doping ratio of the above three NPs. These NPs/PMMA composites are transparent. We tested the up-conversion fluorescence spectra of all the NPs and NPs/PMMA composites, under 980 nm excitation. The up-conversion luminescence spectra of the NPs and NPs/PMMA composites are consistent, which further indicates that the in situ polymerization has not changed the chemical structure of the NPs. Then, we prepared transparent bulk polymers by curing these NPs/PMMA composites. Under 980 nm laser excitation, these NPs/PMMA bulk polymers can emit red, blue, green and white up-conversion emissions, respectively. The results indicate that the NPs/PMMA composites can be applied to three-dimensional (3D) display.
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Preparation of Silver Nanocap Arrays and Their Surface-enhanced Raman Scattering Activity
Chunxu Wang,Duo Xu,Yuhai Wang,Li Wang,Lei Chen,Xiangxin Xue,Zhengkun Qin 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.10
In this article, a surface-enhanced Raman scattering (SERS) substrate of silver nanocap arrays was reported. With increasing the size of nanocaps, the localized surface plasmon resonance (LSPR) of the arrays exhibited tunable ability in the visible spectral region. The optical response of the nanocap arrays stimulated their use in SERS experiments. The assessment of SERS activity of the nanocap arrays was performed by using the 514.5 nm excitation line, and different average enhancement factor (EF) values were obtained. The good tunability of LSPR, relatively high average EF values and long-range order of these substrates suggest that the silver nanocap arrays have promising applications as functional components in spectroscopy, immunoassay, biosensors, and biochips.
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