scholarly journals Silver nanoclusters decked diamond thin film as a substrate for surface-enhanced Raman scattering

AIP Advances ◽  
2012 ◽  
Vol 2 (3) ◽  
pp. 032102 ◽  
Author(s):  
Harish Ojha ◽  
Upender Gangadharani ◽  
Satyavathi Ravulapalli ◽  
Mohan Kumar Kuntumalla ◽  
Vadali Venkata Satya Siva Srikanth ◽  
...  
Keyword(s):  
Thin Film ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Silver Nanoclusters ◽  
Diamond Thin Film ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals Modeling and Experimental Investigations of Nanostructured Ag Thin Films Produced by Oblique-Angle Deposition and Its SERS Performance

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 458
Author(s):  
Datai Hui ◽  
Shun Zhou ◽  
Changlong Cai ◽  
Shigeng Song ◽  
Zhentao Wu ◽  
...  
Keyword(s):  
Thin Film ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Oblique Angle ◽  
Scattering Effects ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Simulation Results ◽  
Deposition Angle

The growth mechanism of nanocolumnar silver thin film deposited on a smooth silicon substrate using electron beam evaporation process at an oblique angle was simulated with the Kinetic Monte Carlo method. Following the simulated silver nanostructured thin film, a further computational simulation was done using COMSOL for surface-enhanced Raman scattering effects. The simulation results were compared against corresponding experimental results, which demonstrated high agreement between simulation results and experimental data. It was found that as the incident deposition angle increased, the density of the Ag thin film significantly decreased and the surface roughness increased. When the incident deposition angle was at 75° and 85°, the resulting nanocolumnar structure was significantly tilted. For Ag thin films deposited at all investigated angles, surface-enhanced Raman scattering effects were observed. Particularly, the Ag nanocolumns deposited at 85° showed remarkable Surface-enhanced Raman Scattering effects. This was seen in both COMSOL simulations and experimental results: Enhancement factors were 2 × 107 in COMSOL simulation and 3.3 × 105 in the experiment.

scholarly journals Surface-Enhanced Raman Scattering and Fluorescence on Gold Nanogratings

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 776 ◽  
Author(s):  
Yu-Chung Chang ◽  
Bo-Han Huang ◽  
Tsung-Hsien Lin
Keyword(s):  
Thin Film ◽  
Raman Scattering ◽  
Fluorescence Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Simple Method ◽  
Enhancement Mechanism ◽  
Gold Thin Film ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) spectroscopy is a sensitive sensing technique. It is desirable to have an easy method to produce SERS-active substrate with reproducible and robust signals. We propose a simple method to fabricate SERS-active substrates with high structural homogeneity and signal reproducibility using electron beam (E-beam) lithography without the problematic photoresist (PR) lift-off process. The substrate was fabricated by using E-beam to define nanograting patterns on the photoresist and subsequently coat a layer of gold thin film on top of it. Efficient and stable SERS signals were observed on the substrates. In order to investigate the enhancement mechanism, we compared the signals from this substrate with those with photoresist lifted-off, which are essentially discontinuous gold stripes. While both structures showed significant grating-period-dependent fluorescence enhancement, no SERS signal was observed on the photoresist lifted-off gratings. Only transverse magnetic (TM)-polarized excitation exhibited strong enhancement, which revealed its plasmonic attribution. The fluorescence enhancement showed distinct periodic dependence for the two structures, which is due to the different enhancement mechanism. We demonstrate using this substrate for specific protein binding detection. Similar periodicity dependence was observed. Detailed theoretical and experimental studies were performed to investigate the observed phenomena. We conclude that the excitation of surface plasmon polaritons on the continuous gold thin film is essential for the stable and efficient SERS effects.

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