tailieunhanh - Ag-decorated TiO2 nanofibers for surface-enhanced raman scattering

In this report, SERS substrates based on Ag-decorated TiO2 nanofibers electrospun on a glass substrate (Ag/TiO2/glass) were successfully prepared using electrospinning and photodeposition methods. XRD pattern demonstrated that the crystalline structure of TiO2 nanofibers (TiO2 NFs) consisted of both anatase and rutile phase. | VNU Journal of Science Mathematics Physics Vol. 37 No. 4 2021 86-94 Original Article Ag-decorated TiO2 Nanofibers for Surface-enhanced Raman Scattering Le Thi Ngoc Loan1 Le Thi Thanh Hiep2 Hoang Thi Hang1 Le Xuan Hung2 1 Quy Nhon University 170 An Duong Vuong Nguyen Van Cu Quy Nhon Vietnam 2 Duy Tan University 254 Nguyen Van Linh Thanh Khe Da Nang Vietnam Received 15 May 2021 Revised 02 July 2021 Accepted 07 July 2021 Abstract In this report SERS substrates based on Ag-decorated TiO2 nanofibers electrospun on a glass substrate Ag TiO2 glass were successfully prepared using electrospinning and photodeposition methods. XRD pattern demonstrated that the crystalline structure of TiO 2 nanofibers TiO2 NFs consisted of both anatase and rutile phase. SEM images show that the randomly oriented on glass substrate TiO2 NFs diameters are in the range of 150 nm-300 nm and their lengths are up to a few micrometers. After 15-minute photodeposition Ag NPs with average diameter of about a few tens of nanometers were uniformly and densely decorated on TiO2 NFs surface. The Ag TiO2 glass SERS substrate was then immersed in mM mM and 1 mM 4-mercaptobenzoic acid 4-MBA solution and was afterwards investigated by UV-Vis absorption and Surface-enhanced Raman Scattering SERS spectra. The preliminary results show that the change in UV-Vis absorption corresponds well to the Raman peak intensity upon the adsorption of probed molecules. This might open up a pathway in the detection and identification of probed molecules based on colorimetric-sensing and SERS-sensing. Keywords Ag-decorated TiO2 4-MBA Raman spectroscopy SERS substrate 1. Introduction Raman spectroscopy is an analytical technique that provides information about chemical structure molecular interactions and molecular conformations. Over the past decades Raman spectroscopy has been used for various applications in materials science and biomedical and chemical analysis. This technique provides information about molecular