Controlled growth of CdSe quantum dots on silica spheres

Byoung-Ju Kim; Dong-Hyun Jo; Se-Han Lim; Do-Kyoon Kim; Jin-Young Park; Kwang-Sun Kang

doi:10.1117/12.2187697

31 August 2015 Controlled growth of CdSe quantum dots on silica spheres

Byoung-Ju Kim, Dong-Hyun Jo, Se-Han Lim, Do-Kyoon Kim, Jin-Young Park, Kwang-Sun Kang

Proceedings Volume 9546, Active Photonic Materials VII; 954615 (2015) https://doi.org/10.1117/12.2187697
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Various sizes of CdSe quantum dots have been fabricated on the surface of the monodisperse silica spheres and five diffe rent photoluminescence (PL) peaks are observed from the CdSe quantum dots. The monodisperse silica spheres were syn thesized with Stöber synthetic method. The surface of the spheres was modified with 100:1 ratio of phenylpropyltrimeth oxysilane (PTMS) and mercaptopropyltrimethoxysilane (MPTMS). The MPTMS works as a covalent bond formation wi th CdSe quantum dots, and the PTMS acts as a separating quantum dots to prevent PL quenching by neighboring quantu m dots. The Fourier transform infrared (FTIR) spectrum of the surface modified spheres (SMSiO₂) shows strong absorpti on peak at 2852 and 2953 cm^-1 representing the characteristic absorption of –CH or -CH2. The FTIR absorption peak at 1 741 cm^-1 represents the characteristic absorption of CdSe quantum dots. The field emission scanning electron microscope image shows the average diameter of the spheres ranging approximately 418 nm. The ultraviolet-visible transmittance s pectrum shows stop band at 880 nm. The PL spectrum shows five different emission bands at 434, 451, 468, 492 and 545 nm, which indicates the formation of several different sizes of CdSe quantum dots.

Conference Presentation

Citation Download Citation

Byoung-Ju Kim, Dong-Hyun Jo, Se-Han Lim, Do-Kyoon Kim, Jin-Young Park, and Kwang-Sun Kang "Controlled growth of CdSe quantum dots on silica spheres", Proc. SPIE 9546, Active Photonic Materials VII, 954615 (31 August 2015); https://doi.org/10.1117/12.2187697

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