CdSe nanoparticles characterized by XRD and HRTEM in function of pH
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.27
CdSe nanoparticles characterized by XRD and HRTEM in function of pH G. Sánchez-Legorreta a*, P. Rosendo-Francisco b*, J. Sumaya-Martínez *, O. Olea-Mejia **, J. L. Rodríguez López*** * Facultad de Ciencias, UAEM, Campus “El Cerrillo, Piedras Blancas”. Carretera Toluca – Ixtlahuaca, Km. 15.5, CP. 50200 Toluca de Lerdo, México
**
Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM. Carretera Km. 14.5, Unidad San Cayetano, Toluca - Atlacomulco, C. P. 50200 Toluca de Lerdo, México
***
Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055. Col. Lomas 4 sección, CP. 78216. San Luis Potosí S.L.P.
a
[email protected], b [email protected]
ABSTRACT
CdSe nanoparticles were grown using a colloidal method, in which the pH was the main parameter that was varied (from 8 to 12) with the objective of knowing the morphological and structural effects after the synthesis process. The samples were characterized with X-ray diffraction and High-Resolution Transmission Electron Microscope to know their crystalline structure. We identified the formation of two crystalline phases in a single sample, as well as the different crystal direction of the material, the crystallites size was calculated from the Xray diffraction pattern using the Debye- Scherrer equation. The distance between planes was also calculated using the Fast Fourier Transformation (FFT). The results and analysis of the experimental work are reported.
INTRODUCTION The nanostructured semiconductors from of II-VI group are the most studied in recent years, whether the material is in form of nanoparticles or quantum dots,
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particularly, Cadmium Selenide (CdSe) nanoparticles [1-6]. In synthesis of materials, the wurtzite CdSe structure is the most common in the literature since has different applications in different areas of research due to its conductor properties, for example, in medicine and biology it is used for the manufacture of light emitting diodes or bio-labels; in optoelectronic for the development of electronic and optoelectronics devices, among others. The synthesis of the zinc blende structure of the CdSe is beginning to be reported and it has been known that it has a band gap similar to that of the wurtzite structure, so it is important to know the effect of pH on the morphology of the typical structures of the CdSe. In another work the effect on its optical properties will be reported. [7-10]. In this work, we are interested in both crystalline structures of the CdSe nanoparticles: cubic (zinc blende - ZB) and hexagonal (wurtzite - W). This material is a semiconductor with direct band gap between 1.4 and 3.8 eV, although there is a wide bandwidth, this presents excellent conductiv
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