SURFACE MODIFICATION OF SOLID SUBSTRATES THEIR FABRICATION, CHARACTERIZATION, AND APPLICATIONS

Date

2016-05

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Abstract

Functionalized organic thin films on gold surfaces were formed from molecular species that include the following custom-designed dithiol adsorbates: (1) a series of bromoisobutyrate-terminated alkanedithiols, and (2) a series of maleimide-terminated alkanethioacetates. For all of these adsorbates, the dithiol headgroup was introduced to enhance the thermal and chemical stability of the resultant self-assembled monolayer films. The structure and properties of the films derived from the adsorbates were characterized by ellipsometry, X-ray photoelectron spectroscopy (XPS), polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS), and UV-visible spectroscopy and compared to monolayers derived from analogous monodentate adsorbates. According to the results, the monolayers formed from the dithiol adsorbates were less densely packed and less ordered than the monodentate-based monolayers. However, the organic monolayers derived from the bidentate adsorbates exhibited important advantages: (1) greater thermal stability (bromoisobutyrate-terminated alkanedithiols, and maleimide–terminated dithioacetates), and (2) greater chemical stability (maleimide–terminated dithioacetates). In separate studies, the surface of silver-coated superconducting YBCO tape was line-patterned using a custom-designed perfluorinated phosphoric acid ink and a line-patterned PDMS stamping followed by characterization using XPS, contact angle goniometry, PM-IRRAS, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The filamentization was designed to improve efficiency by reducing AC loss.

Description

Keywords

Self-assembled monolayer, ATRP, Maleimide, Filamentization, PDMS, microcontact printing, AC loss

Citation

Portions of this document appear in: Im, Kyungun, Duong Nguyen Nguyen, Saerona Kim, Hye Jeong Kong, Yukyung Kim, Chul Soon Park, Oh Seok Kwon, and Hyeonseok Yoon. "Graphene-embedded hydrogel nanofibers for detection and removal of aqueous-phase dyes." ACS applied materials & interfaces 9, no. 12 (2017): 10768-10776.