Spectroscopic studies on quantum dots of PbI2 |
| |
| Institution: | 1. Solid State and Structural Chemistry Unit Indian Institute of Science, Bangalore 560 012, India;2. Department of Physics, Indian Institute of Science, Bangalore 560 012, India;1. Center for Microscopy – Microanalysis and Information Processing, University “Politehnica” of Bucharest, 313 Splaiul Independentei, Sect. 6, 060042 Bucharest, Romania;2. Light Microscopy and Screening Center, Swiss Federal Institute of Technology ETH Zurich, Schaffmatstrasse 18, Zurich, Switzerland;3. Electrical Engineering Department, Valahia University Targoviste, Bd. Carol I, Nr. 2, Romania;1. Laboratory of Applied Research on the Characteristic Resources in the North of Guizhou Province, School of Chemistry and Chemical Engineering, Zunyi Normal College, Zunyi, Guizhou 563002, China;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;1. Photonics and Semiconductor Physics Group, COBRA Research Institute, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands;2. Centre of Nanoheterostructure Physics, Ioffe Institute, 194021 St. Petersburg, Russian Federation;3. Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Iowa City, IA 52242, USA |
| |
| Abstract: | We report the preparation of PbI2 clusters of sizes less than 30 Å by colloidal routes and characterization by optical absorption spectra. We show that the blue-shifted absorption spectra are not due to the presence of I−3 ions, as suggested previously, but are characteristic of the clusters present. We also show that similar sized clusters form, though sparingly, on dissolving bulk PbI2 in the solvents. We establish that the stability of a large concentration of these clusters in the colloidal process is due to the presence of excess iodine ions attached to the microcrystallites. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
