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

Abstract

Using surface enhanced Raman spectroscopy (SERS), we observed Raman enhancements (104−105) for pyridine molecules adsorbed on II−VI semiconductor quantum dots on (uncapped CdSe/ZnBeSe) produced by molecular beam epitaxy. When a monolayer of pyridine is adsorbed on these structures, excitation at 488 nm produces intense Raman spectra, a very large enhancement of the a1, b1, and b2 modes. This indicates the presence of charge transfer as a contributor to the enhancement. Furthermore, the excitation wavelength is in the vicinity of several interband transitions located both in the quantum dots and the wetting layer, and it is likely that these resonances also contribute to the enhancement factor.

Surface‐enhanced Raman scattering characteristics of CuO : Mn/Ag heterojunction probed by methyl orange: effect of Mn2+ doping

“…This triggered considerable interests because of their novel optical and electronic properties. [13][14][15][16][17] Recently, hybridization of nanoparticles of noble metals, e.g., Ag, Au, Cu and Pt with semiconductor, structured carbon and magnetic nanomaterials has drawn attention because of their outstanding SERS performance. [18][19][20][21][22][23][24][25][26] Because the optical band gap plays a crucial role in SERS, therefore, the tuning of the absorption band by doping, change in size, etc.…”

SERS Nanotags and Their Applications in Biosensing and Bioimaging

“…), Al, Ga, In, Pt, Rh, and metallic alloys [39] have also been explored as SERS substrate. Other materials including graphene [40], semiconductors such as TiO 2 [41], and quantum dots [42] have recently been reported to show SERS activity [34].…”

Direct observation of p,p′‐dimercaptoazobenzene produced from p‐aminothiophenol and p‐nitrothiophenol on Cu2O nanoparticles by surface‐enhanced Raman spectroscopy

“…have also been concerned in SERS-related research, which is drawing increasing attention. [3][4][5][6][7][8][9][10] Although different material for substrates being rapid developed for the sake of more extensive application, a new challenge emerged focusing on the real surface chemisorption status in SERS measurement. p-Aminothiophenol (PATP) was a generally used probe molecule whose spectral changes during SERS measurement was first attributed to charge transfer effect in 1994.…”