Surface-enhanced Raman scattering characterization of Ag nanorod arrays fabricated by oblique angle deposition

2010 ◽  
Author(s):  
Yongjun Liu ◽  
Yiping Zhao
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Oblique Angle Deposition ◽  
Nanorod Arrays ◽  
Oblique Angle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Angle Deposition

scholarly journals Fabrication of Au Nanorods by the Oblique Angle Deposition Process for Trace Detection of Methamphetamine with Surface-Enhanced Raman Scattering

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3742
Author(s):  
Baini Li ◽  
Tianran Wang ◽  
Qingqing Su ◽  
Xuezhong Wu ◽  
Peitao Dong
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Oblique Angle Deposition ◽  
Trace Detection ◽  
Oblique Angle ◽  
Au Nanorods ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Angle Deposition

Oblique angle deposition (OAD) is a simple, low cost, effective, and maskless nanofabrication process. It can offer a reliable method for the mass fabrication of uniform metal nanorods which can be used as the surface-enhanced Raman scattering (SERS) substrate with an excellent enhancing performance. Up to now, Ag nanorods SERS substrates have been extensively studied. However, Ag is chemically active and easy to oxidize under atmospheric conditions. Comparatively, Au is chemically stable and has better biocompatibility than Ag. In this paper, we in detail, studied the electromechanical (EM) field distribution simulation, fabrication, and application of Au nanorods (AuNRs) on trace detection of methamphetamine. According to the finite-difference time-domain (FDTD) calculation results, the maximum EM intensity can be obtained with the length of AuNRs to be 800 nm and the tilting angle of AuNRs to be 71° respectively. The aligned Au nanorod array substrate was fabricated by the OAD process. The two key process parameters, deposition angle, and deposition rate were optimized by experiments, which were 86° and 2 Å/s, respectively. Using 1,2-bis (4-pyridyl) ethylene (BPE) as the probe molecule, the limit of detection (LOD) was characterized to be 10−11 M. The AuNRs were also used to detect methamphetamine. The LOD can be down to M (i.e., 14.92 pg/ml), which meet the requirements of the on-site rapid detection of the methamphetamine in human urine (500 ng/ml).

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.

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