Journal
MATERIALS & DESIGN
Volume 197, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.109211
Keywords
SU-8; Photoreduction; Monolayer gold nanoparticles
Categories
Funding
- Ministry of Science and Technology (MOST) of Taiwan [MOST 108-2221-E-006-206, MOST 108-2113-M-006-012-MY3, MOST 108-2622-M-006-001-CC1]
- Department of Health, Taipei City Government (TCH) [10601-62-015]
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The study proposes a novel method for synthesizing a gold nanoparticle monolayer directly on the surface of SU-8, investigating the effects of different polymer surfaces and photoinitiator concentrations on photoreduction ability, as well as the influence of SU-8 initial curing time and reduction repetition times on nanoparticle sizes and densities.
The photoreduction method is a potential method in terms of simplification, speed and cost of the process. This paper presents a simple and novel method for the direct synthesis of a gold nanoparticle monolayer with a droplet of gold precursor on the surface of SU-8 under UV exposure. Photoreduction ability on different polymer surfaces with various photoinitiator concentrations was investigated. The horizontal and vertical distributions of reduced nanoparticles were examined by using a scanning electron microscope and a transmission electron microscope, and crystalline property was verified through energy dispersive X-ray spectroscopy. The influence of SU-8 initial curing time and reduction repetition times on nanoparticle sizes and densities was investigated. The same photoreduction process is applicable to the surface of SU-8 nanostructures. The use of SU-8 nanopillars as a photoreduction substrate can provide a high specific surface area for improving the density of hot spots in the application of surface-enhanced Raman spectroscopy. (C) 2020 The Authors. Published by Elsevier Ltd.
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