Surface Enhanced Raman Spectroscopy of Pyridine on CdSe/ZnBeSe Quantum Dots Grown by Molecular Beam Epitaxy

2010 ◽  
Vol 114 (41) ◽  
pp. 17460-17464 ◽  
Author(s):  
Richard Livingstone ◽  
Xuecong Zhou ◽  
Maria C. Tamargo ◽  
John R. Lombardi ◽  
Lucia G. Quagliano ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

scholarly journals Investigation of the Microstructures of Graphene Quantum Dots (GQDs) by Surface-Enhanced Raman Spectroscopy

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 864 ◽  
Author(s):  
Junxiao Wu ◽  
Peijie Wang ◽  
Fuhe Wang ◽  
Yan Fang
Keyword(s):  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Quantum Confinement Effect ◽  
Pyrolytic Graphite ◽  
Graphene Quantum Dots ◽  
Surface Enhanced Raman Spectroscopy ◽  
Detection Methods ◽  
Significant Feature ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Photoluminescence (PL) is the most significant feature of graphene quantum dots (GQDs). However, the PL mechanism in GQDs has been debated due to the fact that the microstructures, such as edge and in-plane defects that are critical for PL emission, have not been convincingly identified due to the lack of effective detection methods. Conventional measures such as high-resolution transmission electron microscopy and infrared spectroscopy only show some localized lattice fringes of GQDs and the structures of some substituents, which have little significance in terms of thoroughly understanding the PL effect. Here, surface-enhanced Raman spectroscopy (SERS) was introduced as a highly sensitive surface technique to study the microstructures of GQDs. Pure GQDs were prepared by laser ablating and cutting highly oriented pyrolytic graphite (HOPG) parallel to the graphite layers. Consequently, abundant SERS signals of the GQDs were obtained on an Ag electrode in an electrochemical environment for the first time. The results convincingly and experimentally characterized the typical and detailed features of GQDs, such as the crystallinity of sp2 hexagons, the quantum confinement effect, various defects on the edges, sp3-like defects and disorders on the basal planes, and passivated structures on the periphery and surface of the GQDs. This work demonstrates that SERS is thus by far the most effective technique for probing the microstructures of GQDs.

Investigation into the Heterostructure Interface of CdSe-Based Core–Shell Quantum Dots Using Surface-Enhanced Raman Spectroscopy

ACS Nano ◽  
2013 ◽  
Vol 7 (8) ◽  
pp. 6649-6657 ◽  
Author(s):  
Francesco Todescato ◽  
Alessandro Minotto ◽  
Raffaella Signorini ◽  
Jacek J. Jasieniak ◽  
Renato Bozio
Keyword(s):  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Core Shell ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Interaction of TGA@CdTe Quantum Dots with an Extracellular Matrix of Haematococcus pluvialis Microalgae Detected Using Surface-Enhanced Raman Spectroscopy (SERS)

2016 ◽  
Vol 70 (9) ◽  
pp. 1561-1572 ◽  
Author(s):  
Elisa Cepeda-Pérez ◽  
Iris Aguilar-Hernández ◽  
Tzarara López-Luke ◽  
Valeria Piazza ◽  
Ramón Carriles ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Haematococcus Pluvialis ◽  
Surface Enhanced Raman Spectroscopy ◽  
Cdte Quantum Dots ◽  
Cdte Qds ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Complementary Techniques

The present study reports the localization and interaction of thioglycolic acid (TGA) capped CdTe quantum dots (TGA@CdTe QDs) within the extracellular matrix (ECM) of Haematococcus pluvialis (Chlorophyceae) microalgae (HPM) after an incubation period of 5 min. Changes in the Raman spectrum of HPM induced by the adsorption of the TGA@CdTe QDs are successfully found by using naked gold anisotropic structures as nano-sensors for surface-enhanced Raman scattering (SERS effect). Raman spectroscopy results show that TGA@CdTe QDs interact with the biomolecules present in the ECM. Sample preparation and characterization by complementary techniques such as confocal and electron microscopy are also used to confirm the presence and localization of the nanoparticles in the algae. This research shows new evidence on early accumulation of QDs in plant cells and would further improve our understanding about their environmental impact.

In situ surface-enhanced Raman spectroscopy effect in zeolite due to Ag2Se quantum dots

2017 ◽  
Vol 19 (2) ◽  
Author(s):  
C. E. Martinez-Nuñez ◽  
M. Cortez-Valadez ◽  
Y. Delgado-Beleño ◽  
N. S. Flores-López ◽  
J. F. Román-Zamorano ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman
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