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Interfacial layer-by-layer self-assembly of PS nanospheres and Au@Ag nanorods for fabrication of broadband and sensitive SERS substrates.
- Source :
-
Journal of Colloid & Interface Science . Aug2022, Vol. 620, p388-398. 11p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] Broadband surface-enhanced Raman scattering (SERS) substrates can achieve strong SERS enhancement at multiple excitation wavelengths, which is highly desirable in diverse fields. Here, a facile and reliable interfacial layer-by-layer self-assembly technique was proposed to construct broadband and sensitive Au@Ag nanorod (NR) monolayer film over nanosphere (MFON) substrate. The Au@Ag NR MFON substrate with ultra-broad spectrum from visible to near-infrared region was achieved by varying the shape of plasmonic nanoparticles, which exhibits excellent SERS activity at different excitation wavelengths. Besides, the size of Au@Ag NRs and polystyrene spheres, and the layer numbers of Au@Ag NR film were altered to optimize the sensitivity of SERS substrates. Notably, the SERS intensity of the optimally designed Au@Ag NR MFON substrate is 25-fold larger than that of Au@Ag NR monolayer film deposition on the plane Si wafer. Furthermore, the optimal Au@Ag NR MFON substrate presents excellent reproducibility and a much wider quantitative detection range, which enables a wide-linear-range analysis of thiram in grape juice by a portable Raman spectrometer. Therefore, we envision that this study opens a new avenue toward the design of ultra-sensitive and broadband SERS platforms with widespread applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SERS spectroscopy
*NANORODS
*GRAPE juice
*VISIBLE spectra
Subjects
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 620
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 156732590
- Full Text :
- https://doi.org/10.1016/j.jcis.2022.04.040