Multiphonon Raman Scattering in Coupled Cd1鈥?i>xMnxS Nanoparticles: Magnetic Doping and Thermal Annealing
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- 作者：Ernesto S. Freitas Neto ; Sebasti茫o W. da Silva ; Paulo C. Morais ; Noelio O. Dantas
- 刊名：The Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：January 10, 2013
- 年：2013
- 卷：117
- 期：1
- 页码：657-662
- 全文大小：351K
- 年卷期：v.117,no.1(January 10, 2013)
- ISSN：1932-7455
文摘
We report on multiphonon Raman scattering in coupled Cd1鈥?i>xMnxS nanoparticles grown within a glass matrix by the melting nucleation approach. Magnetic force microscopy identified two different-sized groups of nanoparticles coupled together. The high-frequency shoulder appearing above the longitudinal optical (LO) phonon mode has evidenced the acoustic鈥搊ptical phonon coupling in nanoparticles, which depends upon the Mn doping. We found that the multiphonon Raman scattering and the electron鈥揕O phonon coupling can be tuned by thermal annealing. Finally, we found that the magnetic doping induces changes on both the sp鈥揹 exchange interaction and the nanoparticles鈥?crystalline quality. We emphasize that our findings may have an impact on possible technological applications that request handling of the optically induced nonlinear features in nanoparticles which are favored by electron鈥損honon anharmonicities.