Crystallization at room temperature from amorphous to trigonal selenium as a byproduct of the synthesis of water dispersible zinc selenide

Author(s)

Pinto, Alexandre Henrique ^[1] ; Leite, Edson Roberto ^[1] ; Longo, Elson ^[2] ; de Camargo, Emerson Rodrigues ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Estadual Paulista, Inst Quim, BR-14800900 Araraquara, SP - Brazil

• Document type: Journal article
• Source: Materials Letters; v. 87, p. 62-65, NOV 15 2012.
• Web of Science Citations: 7

Abstract

Zinc selenide is a semiconductor material that has been synthesized in aqueous media. However, this synthesis can yield some byproducts, which has been little exploited in literature of this area; one of these byproducts is amorphous selenium. As this amorphous species is unable to be detected through X-ray diffraction, Raman spectroscopy plays an important role in order to track this byproduct. Additionally, the crystallization process from amorphous to trigonal selenium, due to aging at room temperature, was tracked through Raman spectroscopy and transmission electron microscopy. It was observed that, within a period of 5 months, the amorphous selenium was in great part converted to trigonal selenium, which could be deleterious to the properties of the ZnSe quantum dots. (C) 2012 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 10/13735-0 - Green Chemistry synthesis of ZnSe semiconductor nanoparticles with hydrophilic surfaces
• Grantee: Alexandre Henrique Pinto
• Support Opportunities: Scholarships in Brazil - Master