Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence

Nanomaterials and Nanotechnology

Christiane Perrin¹  André Perrin¹  Leandro Matos¹  Elson Longo¹  Guilherme Henrique Cruvinel¹  Yuri V. B. De Santana¹  José Ernane Cardoso Gomes¹  Juan Andrès¹  José A. Varela¹ 

关键词: Silver Molybdate;    Silver Tungstate;    Photoluminescence;    Decorated System;   

DOI  :  10.5772/58923

来源: InTech

【 摘 要 】

Silver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 °C) and co-precipitation (pH 4, 70 °C), and were then used to prepare two core/shell composites, namely α-Ag2WO4/β-Ag2MoO4 (MAH, pH 4, 140 °C) and β-Ag2MoO4/β-Ag2WO4 (co-precipitation, pH 4, 70 °C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag2MoO4 samples obtained by the two methods were single-phased and belonged to the β-Ag2MoO4 structure (spinel type). In contrast, the Ag2WO4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure β-Ag2WO4, while co-precipitation afforded the metastable β-Ag2WO...

【 授权许可】

Unknown