The quantum dots coated by silica is fluorescence material class with great biocompatibility, low toxicity and water-solubility, that is suitable for bioapplications. This work presents the synthesis of SiO2 coated CdTe/ZnSe (named CdTe) quantum dots (CdTeaSiO2 nanoparticles) via a wet chemmical route called modified Stöber method. | VNU Journal of Science Mathematics Physics Vol. 36 No. 2 2020 87-97 Original Article Synthesis and Optical Characterizations of the Fluorescence Silica Nanoparticles Containing Quantum Dots Chu Viet Ha1 Chu Anh Tuan2 Nguyen Thi Bich Ngoc3 Tran Hong Nhung3 Nguyen Quang Liem4 Vu Thi Kim Lien5 6 1Thai Nguyen University of Education 20 Luong Ngoc Quyen Thai Nguyen Vietnam 2Vietnam University of Traditional Medicine 2 Tran Phu Ha Dong Hanoi Vietnam 3Institute of Physics Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Ha Noi Vietnam 4Institute of Materials Science VAST 18 Hoang Quoc Viet Hanoi Vietnam 5Institute of Theoretical and Applied Research Duy Tan University 1 Phung Chi Kien Hanoi Vietnam 6Faculty of Natural Sciences Duy Tan University Da Nang 550000 Vietnam 3 Quang Trung Da Nang Vietnam Received 03 March 2020 Revised 14 April 2020 Accepted 16 April 2020 Abstract The quantum dots coated by silica is fluorescence material class with great biocompatibility low toxicity and water-solubility that is suitable for bioapplications. This work presents the synthesis of SiO2 coated CdTe ZnSe named CdTe quantum dots CdTe@SiO2 nanoparticles via a wet chemmical route called modified Stöber method. The compounds tetraethylorthosilicate TEOS has used as precursors aminopropyltriethoxysilane APTES is as electric neutralizer and ammonium hydroxide is used as catalysts. The size of CdTe@SiO2 nanoparticles was estimated about 70 to 150 nm depending on the quantities of H2O APTEOS and catalysts. The emission behaviours of SiO2 coated quantum dots was effected by ratio of substances participating in the reaction and synthesis conditions. with the ratio by volume of suitable substances TEOS solution of QDs NH4OH APTES H2O being 10-2 10-2 4 10-2 3 10-4 5 10-2 the prepared silica nanoparticles containing quantum dots show high fluorescence emission efficiency with the fluorescence intensity is higher than that of uncoated CdTe ZnSe quantum dots. This is a .
