Surface adsorption of hydroxyanthraquinones on CTAB-modified gold nanosurfaces

Juhyun Yeo; Daedu Lee; Yoonsoo Pang

doi:10.1016/j.saa.2020.119408

Surface adsorption of hydroxyanthraquinones on CTAB-modified gold nanosurfaces

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Apr 15:251:119408. doi: 10.1016/j.saa.2020.119408. Epub 2021 Jan 1.

Authors

Juhyun Yeo¹, Daedu Lee¹, Yoonsoo Pang²

Affiliations

¹ Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
² Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea. Electronic address: ypang@gist.ac.kr.

PMID: 33433377
DOI: 10.1016/j.saa.2020.119408

Abstract

Gold nanosurfaces are widely applied to the surface-enhanced Raman spectroscopy (SERS) detection of the biological systems. The surface modification of gold nanoparticles (AuNPs) is often required when the analytes do not efficiently adsorb on the surface. In this paper, an aggregation of AuNPs with cetyltrimethylammonium bromide (CTAB) was introduced for the efficient surface adsorption and strong SERS enhancement for a number of hydroxyanthraquinones (HAQs). The SERS of HAQs including 1,2-dihydroxyanthraquinone (alizarin) were strongly enhanced with CTAB-modified AuNPs and deprotonation of alizarin was clearly observed upon the pH change. The CTAB-modified AuNPs are regarded as efficient SERS substrates for many biological molecules with weak surface adsorption.

Keywords: 1,2-dihydroxyanthraquinone (alizarin); cetyltrimethylammonium bromide (CTAB); gold nanoparticles; hydroxyanthraquinones; surface-enhanced Raman scattering (SERS).