Plasmonic Au Nanoparticles on 2D MoS2/Graphene van der Waals Heterostructures for High-Sensitivity Surface-Enhanced Raman Spectroscopy

2019 ◽  
Vol 2 (3) ◽  
pp. 1412-1420 ◽  
Author(s):  
Mohammed Alamri ◽  
Ridwan Sakidja ◽  
Ryan Goul ◽  
Samar Ghopry ◽  
Judy Z. Wu
Keyword(s):  
Raman Spectroscopy ◽  
Au Nanoparticles ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
Van Der Waals Heterostructures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Morphological evolution of gold nanoparticles on silicon nanowires and their plasmonics

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49708-49718 ◽  
Author(s):  
Yuan Li ◽  
Wenwu Shi ◽  
Aditya Gupta ◽  
Nitin Chopra
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Silicon Nanowires ◽  
Au Nanoparticles ◽  
Morphological Evolution ◽  
Surface Enhanced Raman Spectroscopy ◽  
Si Nanowires ◽  
One Dimensional ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

One-dimensional heterostructures composed of silicon (Si) nanowires and uniformly decorated with gold (Au) nanoparticles were fabricated and used as a substrate for organic detection based on the surface-enhanced Raman spectroscopy.

Hybrid nanostructure of SiO2@Si with Au-nanoparticles for surface enhanced Raman spectroscopy

Nanoscale ◽  
2019 ◽  
Vol 11 (28) ◽  
pp. 13484-13493 ◽  
Author(s):  
Huan Yang ◽  
Ben Q. Li ◽  
Xinbing Jiang ◽  
Jinyou Shao
Keyword(s):  
Raman Spectroscopy ◽  
Electric Field ◽  
Au Nanoparticles ◽  
Surface Enhanced Raman Spectroscopy ◽  
Local Electric Field ◽  
Hybrid Nanostructure ◽  
Hybrid Resonance ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Hybrid resonance enhanced local electric field for Raman sensing.

Multiplexed Microfluidic Surface-Enhanced Raman Spectroscopy

2007 ◽  
Vol 61 (10) ◽  
pp. 1116-1122 ◽  
Author(s):  
Nahla A. Abu-Hatab ◽  
Joshy F. John ◽  
Jenny M. Oran ◽  
Michael J. Sepaniak
Keyword(s):  
Raman Spectroscopy ◽  
Structural Information ◽  
Numerical Aperture ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
Optical Extinction ◽  
Analytical Technique ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Working Distance

Over the past few decades, surface-enhanced Raman spectroscopy (SERS) has garnered respect as an analytical technique with significant chemical and biological applications. SERS is important for the life sciences because it can provide trace level detection, a high level of structural information, and enhanced chemical detection. However, creating and successfully implementing a sensitive, reproducible, and robust SERS active substrate continues to be a challenging task. Herein, we report a novel method for SERS that is based upon using multiplexed microfluidics (MMFs) in a polydimethylsiloxane platform to perform parallel, high throughput, and sensitive detection/identification of single or various analytes under easily manipulated conditions. A facile passive pumping method is used to deliver Ag colloids and analytes into the channels where SERS measurements are done under nondestructive flowing conditions. With this approach, SERS signal reproducibility is found to be better than 7%. Utilizing a very high numerical aperture microscope objective with a confocal-based Raman spectrometer, high sensitivity is achieved. Moreover, the long working distance of this objective coupled with an appreciable channel depth obviates normal alignment issues expected with translational multiplexing. Rapid evaluation of the effects of anion activators and the type of colloid employed on SERS performance are used to demonstrate the efficiency and applicability of the MMF approach. SERS spectra of various pesticides were also obtained. Calibration curves of crystal violet (non-resonant enhanced) and Mitoxantrone (resonant enhanced) were generated, and the major SERS bands of these analytes were observable down to concentrations in the low nM and sub-pM ranges, respectively. While conventional random morphology colloids were used in most of these studies, unique cubic nanoparticles of silver were synthesized with different sizes and studied using visible wavelength optical extinction spectrometry, scanning electron microscopy, and the MMF-SERS approach.

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