Raman Spectrum Study of 3.3′-Diethylthiatri Carbocyanine Iodide
CAI Hong-xing1, 2, ZHANG Yu1, Ken-Tye Yong2, SHAO Zhen3, LI Yuan-xun4, ZHANG Xi-he1*
1. International Joint Research Center for Nanophotonics and Biophotonics, Changchun University of Science and Technology, Changchun 130022, China 2. The Institute for Lasers, Photonics and Biophotonics, University at Buffalo, State University of New York, Buffalo, New York 14260-4200, USA 3. School of Computer Science and Technology, Changchun University of Science and Technology，Changchun 130022, China 4. Mathematics School of Jilin University, Changchun 130012, China
Abstract：3.3′-diethylthiatricarbocyanine iodide (DTTC) dye is an important infrared Raman probe molecule, and has received great attention in the past decades due to their potential applications in Raman imaging, single cell detection, and tumor marker. In the present work, ordinary Raman, surface enhanced Raman scattering (SERS), and theoretical Raman spectra were given to estimate the Raman spectrum of DTTC suspension. More specifically, the original gold nanospheres (60-nm diameter) and gold nanorods (NRs) were encoded with DTTC and stabilized with a layer of thiol-polyethylene glycol (PEG) as Raman reporter, and SERS data were obtained from the samples. Density functional theory (DFT) calculation was applied to calculate the optimized Raman spectra of DTTC water solvent on a B3LYP/6-31G level. Subsequently, the obtained experimental spectra from the DTTC were carefully compared with the theoretically calculated spectra. From the spectra comparation, good agreements were obtained between the theoretical and experimental results. This work will facilitate the development of ultrasensitive SERS probes for advanced biomedical applications.
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