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Location: Home > Publications > New Papers
Paper Code  
Title   The gold nanoparticle springs' spectrum modulation
Authors   Wang Zhenyu, Ouyang Xinrong, Liu Jing, Xiong Bin etc.
Corresponding Author  
Year   2018
Title of Journal  
Volume   5
Number   11
Page  
Abstract   The nanoparticles' localized surface plasma resonance (LSPR) reveals an excellent light manipulation potentiality for the nano scale optical device development. Due to the coupling effect, the LSPR is very sensitive to the distance between the nanoparticles. Using the surface modification one nanoparticle could be grafted onto another one. But the LSPR peak shifting of such twin-nanoparticles architecture was stationary. In this study, the gold nanoparticles springs (80 nm AuNp (gold nanoparticle)-PEG 75 (Polyethylene glycol) chain-45 nm AuNp) were on-situ self-assembly anchored on the glass substrate inside the ITO (indium-tin-oxide) electrodes pair trenches. Since the 80 nm AuNPs were grafted on the glass substrate by the Au-S bonds. Utilizing the large angle laser irradiation dark field microscopic imaging technology, the scattering spectral shifting of the deformed gold nanoparticles springs could be easily traced. With the electric field changing and reversing, the scattering spectra of the parallel gold nanoparticle springs showed an accredited linear (r(2) = 0.8) modulation from 570 nm to 620 nm. Although the linked PEG 75 molecular is a long flexible transparent polymer chain. Deducting from the semi-empirical formula of LSPR, zeta potential, and the PEG worm like chain (WLC) deformation model, the wreathed length (5-18 nm) of the parallel gold nanoparticles springs under the dynamic electrostatic field (-100-100 KV m(-1)) could be speculated. The FDTD (Finite Difference Time Domain) simulation also provided the similar spectral shifting numerical results. With the development of the gold nanoparticles springs precisely controlling, many nano optical spectral modulation applications will be promoted.
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Classification: SCI
Source:
Title of Journal: MATERIALS RESEARCH EXPRESS
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