Facile preparation of nanoparticle based SERS substrates for trace molecule detection

In this work, we demonstrate that a polished Si wafer surface can be converted to possess strong surface-enhanced Raman scattering (SERS) activity by spray coating of polyol synthesized colloidal silver nanoparticles (AgNPs) at as low as 1% surface coverage. The SERS activity assays of substrate surfaces prepared with different production procedures (spray and spin coating) at different surface coverages are realized using population statistics. The resulting Raman enhancement factors (EFs) are discussed with the help of distance-dependent electromagnetic simulations for single particles and dimers. Statistics on the SERS effect and the corresponding EF calculations show that polyol synthesized AgNPs exhibit extremely strong SERS activity with EFs up to 10(8)at as low as 1% surface coverage. We discuss in this work that this is possible due to the distinct properties of polyol synthesized AgNPs such as atomically flat surfaces, sharp edges and corners naturally occurring in this synthesis method, which favor strong plasmonic activity. The method can be generalized to convert virtually any surface into a SERS substrate.


Associative behaviour and effect of functional groups on the fluorescence of graphene oxide
Ozcan, Sefika; Vempati, Sesha; Çırpan, Ali; Uyar, Tamer (Royal Society of Chemistry (RSC), 2018-01-01)
We have juxtaposed the structural, vibrational and emission properties of graphene oxide (GO) with various degrees of reduction with and without a model dispersant, unveiling a strong associative behavior between GO sheets and the influence of H-bonds. The interlayer spacings are similar to 0.84 and 0.78 nm for the as prepared and reduced samples. -OH groups are predominantly effected by the photo-thermal reduction. Also we note some regeneration of > C=O and -COOH groups in reduced samples. Clear changes t...
Empirical many-body potential energy function for silver and gold: Application to microclusters
Erkoc, Sevilay (Elsevier BV, 1990-9)
A recently developed empirical many-body potential energy function (PEF) has been modified and parametrized for the elements silver and gold. The PEF comprises two- and three-body atomic interactions, which satisfy both the bulk cohesive energy per atom and the bulk stability exactly, and give the bulk modulus reasonably well. The structural stability and energetics of microclusters of these elements containing three to seven atoms have been investigated. It has been found that the triangular form of trimer...
Metallization of the C-60/Rh(100) interface revealed by valence photoelectron spectroscopy and density functional theory calculations
Wade, Abdou-Ciss; Lizzit, Silvano; Petaccia, Luca; Goldoni, Andrea; Diop, Djibril; Toffoli, Hande; Fabris, Stefano; Baroni, Stefano (AIP Publishing, 2010-06-01)
The electronic structure of single and multiple layers of C-60 molecules deposited on a Rh(100) surface is investigated by means of valence photoemission spectroscopy and density functional theory calculations. The binding of the fullerene monolayer to the metal surface yields the appearance of a new state in the valence band spectrum crossing the Fermi level. Insight into the metallization of the metal/fullerene interface is provided by the calculated electronic structure that allows us to correlate the me...
Mesoscopic nonequilibrium thermodynamics of solid surfaces and interfaces with triple junction singularities under the capillary and electromigration forces in anisotropic three-dimensional space
Ogurtani, TO (AIP Publishing, 2006-04-14)
A theory of irreversible thermodynamics of curved surfaces and interfaces with triple junction singularities is elaborated to give a full consideration of the effects of the specific surface Gibbs free energy anisotropy in addition to the diffusional anisotropy, on the morphological evolution of surfaces and interfaces in crystalline solids. To entangle this intricate problem, the internal entropy production associated with arbitrary virtual displacements of triple junction and ordinary points on the interf...
Bosonic helium droplets with cationic impurities: Onset of electrostriction and snowball effects from quantum calculations
Coccia, E.; Bodo, E.; Marinetti, F.; Gianturco, F. A.; Yıldırım, Erol; Yurtsever, M.; Yurtsever, E. (AIP Publishing, 2007-03-28)
Variational Monte Carlo and diffusion Monte Carlo calculations have been carried out for cations such as Li(+), Na(+), and K(+) as dopants of small helium clusters over a range of cluster sizes up to about 12 solvent atoms. The interaction has been modeled through a sum-of-potential picture that disregards higher order effects beyond atom-atom and atom-ion contributions. The latter were obtained from highly correlated ab initio calculations over a broad range of interatomic distances. This study focuses on ...
Citation Formats
O. Demirta, D. Doğanay, İ. M. Öztürk, H. E. Ünalan, and A. Bek, “Facile preparation of nanoparticle based SERS substrates for trace molecule detection,” PHYSICAL CHEMISTRY CHEMICAL PHYSICS, pp. 21139–21146, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56808.