Pei-Kuen Wei’s scientific contributions

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Publications (1)

OM images (first row), AFM tomography images (second row) and line profiles (third row), and EFM images (fourth row) of the PPE LiNbO3 substrates with the annealing time of (a)0 hr; (b)1 hr; (c)4 hrs; (d)9 hrs; (e)16 hrs.
SEM images (first and second row), AFM tomography images (third row) and line profiles (fourth row) of photoreduced silver nanoparticles on the PPE LiNbO3 substrates treated with the annealing time of (a)0 hr; (b)1 hr; (c)4 hrs; (d)9 hrs; (e)16 hrs.
(a-e) Simulated spontaneous polarization distribution and vectorial electrostatic filed distribution of the PPE LiNbO3 substrates treated with the annealing time of 0 hr, 1 hr, 4 hrs, 9 hrs, and 16 hrs. The normalized distribution of (f) the in-plane component (Ex), (g) the out-of-plane component (Ez), and (h) the field value of the electrostatic field at the depth 10nm below the + z surface.
(a) Transmission spectra of the SERS substrates treated with the annealing time of 0 hr, 1 hr, 4 hrs, 9 hrs, and 16 hrs; (b) dependence of LSPR wavelength on the square root of the annealing time.
(a) R6G dye SERS spectra on the plain LiNbO3 substrates and the SERS substrates treated with the annealing time of 0 hr, 1 hr, 4 hrs, 9 hrs, and 16 hrs; (b) dependence of Raman intensity on the square root of the annealing time.
Electrostatic-field-tunable ferroelectric template for photoreduction of silver nanostructures applied in Raman scattering enhancement
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July 2017

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182 Reads

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7 Citations

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Hsi-Yang Hsu

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Hsuan-Wei Chang

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Pei-Kuen Wei

We present an electrostatic-field-tunable ferroelectric template to produce photoreduced silver nanostructures for Raman scattering enhancement. The intensity and distribution of the surface electrostatic field in the ferroelectric template determine the morphology of the photoreduced silver nanostructures and thus the degree of the Raman signal enhancement. The surface electrostatic field is produced by periodically proton-exchanged (PPE) regions in LiNbO3 and is tuned by thermal annealing to obtain the favorable photoreduced silver nanostructure. The variation of surface electrostatic properties by thermal annealing is simulated using the finite element method and measured by electrostatic force microscopy. The mechanism of silver nanostructure formation affected by the electrostatic field distribution is discussed. The formed silver nanostructures are functionalized by R6G dye to enable Raman signal measurement. The proposed method is demonstrated to be effective in tuning the surface electrostatic field distribution and produces a 4.13 times higher silver nanostructure and a 2.51 times larger Raman intensity in comparison with the conventional PPE sample.

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Citations (1)

... In Fig. 4(b), the Raman signal's peaks of the R6G dye in the case of 0.1% appear at the wavenumbers of 1181 cm − 1 , 1314 cm − 1 , 1365 cm − 1 , 1514 cm -1 and 1661 cm − 1 , which is much higher than the other cases. The highest Raman intensity of R6G dye at 1365 cm − 1 is due to the aromatic C-C stretching of the R6G molecule [24,[47][48][49]. Note that the highest Raman signal peak of R6G dye in the case of 1% at the wavenumber of 1365 cm − 1 is enhanced 13 times than the flat LN substrate. ...

Reference:

Resonant enhancement of photoluminescence from dye molecules in lithium niobate substrate using photoinduced silver deposition with concentration dependence
Electrostatic-field-tunable ferroelectric template for photoreduction of silver nanostructures applied in Raman scattering enhancement

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Hsi-Yang Hsu

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Hsuan-Wei Chang

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[...]

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Pei-Kuen Wei