1602-97-7Relevant academic research and scientific papers
Size Tunable Cesium Antimony Chloride Perovskite Nanowires and Nanorods
Pradhan, Bapi,Kumar, Gundam Sandeep,Sain, Sumanta,Dalui, Amit,Ghorai, Uttam Kumar,Pradhan, Swapan Kumar,Acharya, Somobrata
, p. 2135 - 2142 (2018)
All-inorganic perovskite nanocrystals are emergent alternative of organolead halide perovskites. Cesium antimony halide (Cs3Sb2X9, X = Cl, Br, I) all-inorganic perovskites nanocrystals possessing analogous electronic configuration to the organolead halide perovskites are promising materials for optoelectronic applications. We report on a colloidal route to synthesis uniform Cs3Sb2Cl9 perovskite nanowires with lengths up to several microns. We have synthesized aspect ratio controlled nanorods with the same ～20 nm diameter of nanowires by tuning the precursors and ligands in the reaction. The crystallinity of the nanocrystals is significantly altered from the pristine bulk trigonal and orthorhombic phases owing to the one-dimensional shape of the nanocrystals. Rietveld refinement carefully separates out orthorhombic phase from the trigonal phase revealing a coexistence of both the phases in a minor and major ratio in the nanocrystals. The functionality in the form of fast photodetector demonstrates Cs3Sb2Cl9 nanocrystals as promising materials for optoelectronic applications.
Use of long chain amine as a reducing agent for the synthesis of high quality monodisperse iron(0) nanoparticles
Meffre, Anca,Lachaize, Sebastien,Gatel, Christophe,Respaud, Marc,Chaudret, Bruno
, p. 13464 - 13469 (2011)
This article reports the synthesis of iron(0) nanoparticles at moderate temperature - from 120 °C to 150 °C - using the reduction of the organometallic iron(ii) precursor {Fe[N(SiMe3)2] 2}2 by hexadecylamine (HDA) in the absence of dihydrogen (H2). The nanoparticles are monodisperse in size and self-assemble into 2D super-lattices suitable for transport measurements. The nanoparticles are stabilized in mesitylene by a mixture of HDA and hexadecylammonium chloride (HDA·HCl). The resulting truncated single-crystalline nanocubes have a narrow size distribution and a high magnetization close to the bulk value. The products are characterized by transmission electronic microscopy (TEM and HRTEM), SQUID measurements, Moessbauer and Infra-Red spectroscopies. Fe(ii) reduction is accompanied by oxidation of amines into imines which was detected as a by-product. This reduction occurs at 120 °C and above. The temperature, in conjunction with the reaction time, allows for a fine control of the nano-objects final size. The latter can also be tuned with the HDA·HCl concentration. Finally, this one-pot synthesis produces high-quality magnetic nanoparticles with mean sizes in the range 6 to 10 nm depending on the conditions.
