Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

JOURNAL OF ALLOYS AND COMPOUNDS

卷:789

Article

Marin, Oscar^1,2,3  Soliz, Tania⁵  Andres Gutierrez, Jorge⁶  Tirado, Monica^1,3,4  Figueroa, Carlos^1,2,3  Comedi, David^1,2,3 

[1] Univ Nacl Tucuman, Fac Ciencias Exactas & Tecnol, NanoProject, Ave Independencia 1800, San Miguel De Tucuman, Tucuman, Argentina

[2] Univ Nacl Tucuman, Fac Ciencias Exactas & Tecnol, Lab Fis Solido LAFISO, Dept Fis, Ave Independencia 1800, San Miguel De Tucuman, Tucuman, Argentina

[3] UNT, CONICET, Inst Fis Noroeste Argentino INFINOA, San Miguel De Tucuman, Argentina

[4] Univ Nacl Tucuman, Fac Ciencias Exactas & Tecnol, LNPD, Dept Fis, Ave Independencia 1800, San Miguel De Tucuman, Tucuman, Argentina

[5] Univ Nacl Tucuman, Fac Ciencias Exactas & Tecnol, Dept Ingn Biomed, Ave Independencia 1800, San Miguel De Tucuman, Tucuman, Argentina

[6] Univ Quindio, Fac Ciencias Basicas & Tecnol, Armenia, Quindio, Colombia

关键词: Hydrothermal synthesis;    ZnO nano and microstructures;    Diethanolamine;    ZnO point defects;    Micro-Raman;    Photoluminescence;   

DOI  :  10.1016/j.jallcom.2019.03.115

来源: Elsevier

【 摘 要 】

Powders of ZnO and ZnO:M (M = Al3+ and Sr2+) with 1 and 4% of M nominal content were synthetized by a hydrothermal method in a diethanolamine (DEA) medium. The samples were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), micro-Raman and photoluminescence (PL). The powder particles were spherical with average radius decreasing from 1 mu m down to 70 nm with increasing Al3+ nominal content but nearly independent on the Sr2+ nominal content. The XRD and micro-Raman results indicate that both Al3+ and Sr2+ mostly incorporated substitutionally into the ZnO lattice, giving rise to compressive and tensile strain, respectively, as a result of ionic radii differences. The PL spectra for ZnO:Al exhibit a dopant-induced contribution at similar to 3.1 eV, which is not observed for ZnO:Sr, due to radiative transitions involving trapping of photocarriers at theoretically expected substitutional Al3+ donor states or at Zn interstitial defects. (C) 2019 Elsevier B.V. All rights reserved.

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