SERS OF ORGANIC ANALYTE ON THE FILTER PAPER WITH TIO2 ALD COATING AND AG NANOPARTICLES

1 VOVES Jan
Co-authors:
1 MARES David 1 DADASHOV Ruhani 2 SU Wei-Nien 2 SUWITO Steven 2 BEYENE Agaje Bedemo
Institutions:
1 Department of Microelectronics, Faculty of Electrical Engineering, Czech Technical University in Prague (CTU), Prague, Czech Republic, EU, voves@fel.cvut.cz
2 Division/Department Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology (TAIWAN TECH), Taiwan, wsu@mail.ntust.edu.tw
Conference:
14th International Conference on Nanomaterials - Research & Application, OREA Congress Hotel Brno, Czech Republic, EU, October 19 - 21, 2022
Proceedings:
Proceedings 14th International Conference on Nanomaterials - Research & Application
Pages:
297-302
ISBN:
978-80-88365-09-9
ISSN:
2694-930X
Published:
23rd November 2022
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
207 views / 120 downloads
Abstract

Surface Enhanced Raman Spectroscopy (SERS) is an important method for characterizing different materials and chemical analytes at low concentrations. The Raman signal plasmonic amplification is strongly dependent on the surface nanostructure. The filter paper could be used as the substrate for the chemical analysis of organic materials. We investigated the influence of different TiO2 thicknesses deposited on the ashless filter paper surface on the signal efficiency. TiO2 is hydrophilic and biocompatible. High-surface area TiO2 on the filter paper will help create 3D heterostructure to collect more analyte molecules. We used Sentech SI 500 thermal Atomic Layer Deposition (ALD) System with 10, 20, and 50 growth cycles and the TTIP precursor. Surface structure was investigated by Atomic Force Microscopy (AFM). The silver (Ag) colloid solution was dropped on the filter paper before standard R6G biomarker solutions were deposited. The Raman signal measured by In Via Renishaw spectrometer was compared for the different samples. TiO2 ALD-20 cycle gave the highest enhancement factor (~2.3 X 105) compared to other ALD-coated samples. Interestingly, the TiO2 ALD coating generally results in an enhancement factor more than 20 times higher than the reference sample (namely filter paper without the ALD coating). SERS mapping results suggest the uniformity and reliability of SERS measurements across a large area (40 x 40 um2). The finding paves a new direction for preparing simple, flexible, and biocompatible SERS substrates, which could be readily applied in detecting various biomolecular or organic analytes in our coming works.

Keywords: Surface enhanced Raman spectroscopy, filter paper, titanium oxide, atomic layer deposition

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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