Differential Surface Partitioning for An Ultrasensitive Solid-State SERS Sensor and Its Application to Food Colorant Analysis

doi:10.1016/j.foodchem.2022.132415

機構典藏 > College of Sciences > Graduate Institute & Department of Chemistry > Journal Article > Item 987654321/122129

Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/122129

Title:	Differential Surface Partitioning for An Ultrasensitive Solid-State SERS Sensor and Its Application to Food Colorant Analysis
Authors:	Chien, Yu-San;Chang, Chia-Wen;Huang, Chia-Chi
Keywords:	SERS;hydrophobic;oleophobic;4-aminophenyl disulfide;food colorants
Date:	2022-02-10
Issue Date:	2022-02-15 12:12:06 (UTC+8)
Publisher:	Elsevier
Abstract:	Solid-state SERS sensors are desirable point-of-care tools due to their portability. However, the level of SERS sensitivity achieved in liquid phase is rarely duplicated in the solid phase. We report herein the fabrication of a SERS sensor using alumina beads as the solid support and demonstrate its high SERS sensitivity with the model analyte 4-aminophenyl disulfide (4-APDS). The key to sensitivity is a hydrophilic-hydrophobic surface gradient constructed by sequentially coating with the surfactant cetyltrimethylammonium bromide and fluorous 1H,1H,2H,2H-perfluorooctyltriethoxysilane. The surface gradient, together with chloride etching, allows the detection of 4-APDS at the low concentration of 10-15 M. The practicality of the sensor beads is evidenced by successfully tracking the SERS fingerprints of five food colorant standards in the SERS spectra of a popular candy product. These SERS sensor beads are easy to prepare, convenient to use, and highly responsive as a SERS platform for the analysis of colorants.
Relation:	Food Chemistry, 132415
DOI:	10.1016/j.foodchem.2022.132415
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	137	View/Open

Loading...