Enhanced green photoluminescence and dispersion of ZnO quantum dots shelled by a silica shell
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RESEARCH PAPER
Enhanced green photoluminescence and dispersion of ZnO quantum dots shelled by a silica shell R. Pérez-Cuapio & J. Alberto Alvarado & M. Pacio & A. Arce-Plaza & J. Santoyo-Salazar & L. H. Liang & H.-J. Sue
Received: 19 March 2020 / Accepted: 11 August 2020 # Springer Nature B.V. 2020
Abstract Zinc oxide (ZnO) quantum dots (QDs) stabilized/functionalized with oleic acid and coreshelled with silicon dioxide (SiO2) are presented. A colloidal route, free surfactant was followed to synthesize ZnO QDs with an average size of 5 nm. After, the ZnO QDs were stabilized with oleic acid to avoid aggregation followed by (3-aminopropyl)
R. Pérez-Cuapio (*) Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Av. Sn. Claudio y 18 sur, Jardines de San Manuel, 72570 Puebla, Mexico e-mail: [email protected] J. A. Alvarado (*) : M. Pacio Centro de Investigación en Dispositivos Semiconductores, Benemérita Universidad Autónoma de Puebla, 14 Sur and Av. San Claudio, San Manuel, 72000 Puebla, Mexico e-mail: [email protected]
trimethoxysilane functionalization. The X-ray diffraction patterns and transmission electron microscopy results indicated that the ZnO QD size and morphology did not suffer any change after functionalization. In addition, the photoluminescence measurements showed a strong green emission band related to particle size and the shell formation. Moreover, the quantum yield and z potential values were determined and the results showed an enhanced for those ZnO@SiO2 samples with 10 wt% of shell precursor. In this research, we report a high relationship between the stability and photoluminescence properties with the shell precursor concentration. Furthermore, we have developed a reliable method to obtain functionalized ZnO QDs which offer a great potential for future use as photoemission devices such as photonics, photocatalytic activities, biomedicine, optoelectronic devices, and chemical sensing.
A. Arce-Plaza Escuela Superior de Ingeniería y Arquitectura Unidad Zacatenco, Instituto Politécnico Nacional (ESIAZ-IPN), 07738 Ciudad de Mexico, Mexico
Keywords Zinc oxide . Quantum dots . Core-shell . Stability . Green emission . Colloids
J. Santoyo-Salazar Departamento de Física, Centro de Investigación y de Estudios Avanzados del I. P. N, A. P. 14-740, 07360 Ciudad de Mexico, Mexico
Introduction
L. H. Liang College of Urban and Environmental Science, Northwest University, Xi’an, China H.
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