scholarly journals Surface-Enhanced Raman Spectroscopy (SERS) Study Using Oblique Angle Deposition of Ag Using Different Substrates

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1581 ◽  
Author(s):  
Jaeyeong Lee ◽  
Kyungchan Min ◽  
Youngho Kim ◽  
Hak Ki Yu
Keyword(s):  
Raman Spectroscopy ◽  
High Surface ◽  
Surface Enhanced Raman Spectroscopy ◽  
Oblique Angle Deposition ◽  
Oblique Angle ◽  
Sio2 Substrate ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Ag Substrate ◽  
Angle Deposition

The oblique angle deposition of Ag with different deposition rates and substrates was studied for surface-enhanced Raman spectroscopy (SERS) efficiency. The deposition rate for the Ag substrate with maximum SERS efficiency was optimized to 2.4 Å/s. We also analyzed the morphology of Ag nanorods deposited at the same rate on various substrates and compared their SERS intensities. Ag deposited on SiO2, sapphire, and tungsten showed straight nanorods shape and showed relatively high SERS efficiency. However, Ag deposited on graphene or plasma-treated SiO2 substrate was slightly or more aggregated (due to high surface energy) and showed low SERS efficiency.

Electrostatic-driven solid phase microextraction coupled with surface enhanced Raman spectroscopy for rapid analysis of pentachlorophenol

2017 ◽  
Vol 9 (3) ◽  
pp. 459-464 ◽  
Author(s):  
Weiwei Bian ◽  
Sha Zhu ◽  
Mingying Qi ◽  
Lanlan Xiao ◽  
Zhen Liu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Surface Charge ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Surface Enhanced Raman Spectroscopy ◽  
Rapid Analysis ◽  
Positive Surface Charge ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Ag Substrate

Rapid analysis of pentachlorophenol by electrostatic-driven SPME–SERS on a nanoporous Ag substrate with positive surface charge.

scholarly journals Vapor Phase Sensing Using Metal Nanorod Thin Films Grown by Cryogenic Oblique Angle Deposition

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Piyush Shah ◽  
Dongquan Ju ◽  
Xiaoxu Niu ◽  
Andrew M. Sarangan
Keyword(s):  
Thin Films ◽  
Vapor Phase ◽  
Oblique Angle Deposition ◽  
Oblique Angle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Comsol Simulation ◽  
Angle Deposition ◽  
Good Agreement

We demonstrate the chemical sensing capability of silver nanostructured films grown by cryogenic oblique angle deposition (OAD). For comparison, the films are grown side by side at cryogenic (~100 K) and at room temperature (~300 K) by e-beam evaporation. Based on the observed structural differences, it was hypothesized that the cryogenic OAD silver films should show an increased surface enhanced Raman scattering (SERS) sensitivity. COMSOL simulation results are presented to validate this hypothesis. Experimental SERS results of 4-aminobenzenethiol (4-ABT) Raman test probe molecules in vapor phase show good agreement with the simulation and indicate promising SERS applications for these nanostructured thin films.

scholarly journals Detection of overtone and combined peaks using Mn/Cu helical star-shaped (pine-tree-like) sculptured thin films in surface-enhanced Raman spectroscopy

2019 ◽  
Vol 13 (4) ◽  
pp. 305-314
Author(s):  
Reza Babaei ◽  
Shokoofe Goli-Haghighi ◽  
Hadi Savaloni
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Laser Wavelength ◽  
Oblique Angle Deposition ◽  
Sculptured Thin Films ◽  
Pine Tree ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Ring Mode

Abstract Mn helical star-shaped (pine-tree-like) nano-sculptured thin films with three-, four-and fivefold symmetry on copper substrates were produced using oblique angle deposition method in conjunction with rotation of sample holder at certain angles. Raman spectroscopy of the samples which were subjected to impregnation by 4,4′-bipyridine (C10H8N2) solution was carried out by 632.8 nm wavelength laser. The analysis of the Raman spectra showed enhancement for the 4,4′-bipyridine main bands (1592 and 1297 cm−1) belonging to the C=C stretching mode, aromatic ring stretching ring and in-plane ring mode of 4,4′-bipyridine, same as results obtained for Ag nano-structures. In addition, overtone and combined peaks are detected that may be related to the particular sculptured structure of the thin films fabricated in this work and the laser wavelength used for Raman spectroscopy. UV–Vis (absorption mode) spectra showed consistent observations with the SERS results leading to important role of surface electromagnetic selection rule in intensification of SERS, in addition pointing out the importance of the effect of the size of hot spots on the frequency of the localized surface plasmonic oscillations.

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).

Sign in / Sign up

Export Citation Format

Share Document