tailieunhanh - Báo cáo hóa học: " Glassy State Lead Tellurite Nanobelts: Synthesis and Properties"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Glassy State Lead Tellurite Nanobelts: Synthesis and Properties | Nanoscale Res Lett 2010 5 1344-1350 DOI s11671-010-9651-9 NANO EXPRESS Glassy State Lead Tellurite Nanobelts Synthesis and Properties Buyong Wan Chenguo Hu Hong Liu Xueyan Chen Yi Xi Xiaoshan He Received 30 March 2010 Accepted 17 May 2010 Published online 4 June 2010 The Author s 2010. This article is published with open access at Abstract The lead tellurite nanobelts have been first synthesized in the composite molten salts KNO3 LiNO3 method which is cost-effective one-step easy to control and performed at low-temperature and in ambient atmosphere. Scanning electron microscopy X-ray diffraction transmission electron microscopy X-ray photoelectron spectrum energy dispersive X-ray spectroscopy and FT-IR spectrum are used to characterize the structure morphology and composition of the samples. The results show that the as-synthesized products are amorphous and glassy nanobelts with widths of 200-300 nm and lengths up to tens of microns and the atomic ratio of Pb Te O is close to 1 4. Thermo-gravimetric analysis TGA and differential scanning calorimetry DSC and investigations of the corresponding structure and morphology change confirm that the nanobelts have low glass transition temperature and thermal stability. Optical diffuse reflectance spectrum indicates that the lead tellurite nanobelts have two optical gaps at ca. eV and eV. Photoluminescence PL spectrum and fluorescence imaging of the products exhibit a blue emission round 480 nm . B. Wan C. Hu Y. Xi X. He Department of Applied Physics Chongqing University 400044 Chongqing People s Republic of China e-mail hucg@ B. Wan Key Laboratory of Optical Engineering College of Physics and Information Technology Chongqing Normal University 400047 Chongqing People s Republic of China H. Liu X. Chen State Key Laboratory of Crystal Materials Shandong University 250100 Jinan People s Republic of China Keywords Chemical synthesis Lead tellurite Nanostructures Molten salt .