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Effect of synthesis time on plasmonic properties of Ag dendritic nanoforests

Authors :
Hung Ji Huang
Han-Wei Chang
Chia-Yen Lee
Ming-Hua Shiao
Yen-Ling Chiu
Pee-Yew Lee
Yung-Sheng Lin
Source :
IUCrJ. 9(Pt 3)
Publication Year :
2021

Abstract

The effects of synthesis time on the plasmonic properties of Ag dendritic nanoforests on Si substrate (Ag-DNF/Si) samples synthesized through the fluoride-assisted galvanic replacement reaction were investigated. The Ag-DNF/Si samples were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, reflection spectroscopy, X-ray diffraction and surface-enhanced Raman spectroscopy (SERS). The prolonged reaction time led to the growth of an Ag-DNF layer and etched Si hole array. SEM images and variations in the fractal dimension index indicated that complex-structure, feather-like leaves became coral-like branches between 30 and 60 min of synthesis. The morphological variation during the growth of the Ag DNFs resulted in different optical responses to light illumination, especially those of light harvest and energy transformation. The sample achieved the most desirable light-to-heat conversion efficiency and SERS response with a 30 min growth time. A longer synthesis time or thicker Ag-DNF layer on the Si substrate did not have superior plasmonic properties.

Details

ISSN :
20522525
Volume :
9
Issue :
Pt 3
Database :
OpenAIRE
Journal :
IUCrJ
Accession number :
edsair.doi.dedup.....e4d144b85a3321ddee3ac754211f19c4