Theoretical and experimental studies of stressed nanoparticles of II-VI semiconductors.
A theoretical and experimental study of isolated nanoparticles of II-VI semiconductor materials has been done. Using the framework of the effective mass model, the optical absorption spectrum of distributions of spherical quantum dots, freestanding, and under compressive or tensile stress, has been examined theoretically. The theoretical results allow one to foresee the absorption spectra of quantum dots made of a series of materials and having any size. The syntheses of colloidal quantum dots of CdS and CdSe has also been performed through wet chemical routes and characterized by means of optical techniques. The values of the strains in the synthesized quantum dots were inferred from a correlation established between the theoretical and the experimental results.
Ferreira
D Lourençoni
DL
Departamento de Fisica, ICEx, Universidade Federal de Minas Gerais, C. P. 702, 30123-970, Belo Horizonte, Minas Gerais, Brazil. diegolourenconi@gmail.com
Silva
F Oliveira
FO
Viol
L Cristina de Souza
LC
Licínio
P
P
Schiavon
M Antônio
MA
Alves
J Luiz Aarestrup
JL
D019187:Cadmium Compounds / Q000138:chemical synthesis / Q000737:chemistry; D003198:Computer Simulation; D008422:Materials Testing; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D045663:Quantum Dots; D011789:Quantum Theory; D018036:Selenium Compounds / Q000138:chemical synthesis / Q000737:chemistry; D012666:Semiconductors; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry
D019187:Cadmium Compounds; D018036:Selenium Compounds; D013440:Sulfides; C034939:cadmium sulfide; C058667:cadmium selenide