title: Automatically purification of aqueous CdTe nanocrystals in water-ethanol co-environment.
abstract: Purification is a separated post-treatment step after the synthesis of nanocrystals (NCs) in order to exclude excess ligands and monomers in NC solution. The common purification process involves many manipulations, such as concentrating, addition of anti-solvents and centrifugation, which are troublesome and time consuming. In this work, we originally integrate NC synthesis and NC purification in one-pot via selecting water-ethanol co-environment for NC synthesis and NC purification. Our research shows that NCs can grow in water-ethanol mixture. When growing into critical size, NCs will automatically precipitate from the solution. Element analysis demonstrates that precipitates fraction fits well with stoichiometric of ligand-capped NCs. Excess monomers are left in supernatant, and thus achieving automatically purification of NCs in the water-ethanol co-environment. By adjusting the volume ratios of water and ethanol in bi-solvent system, different-sized purified NCs can be controlled. Besides, this water-ethanol co-environment can be used in both thermal-promoted and hydrazine-promoted growth.
authors: Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, China.
authors: Yuan
authors: Y
authors: Jiang
authors: Chunlei
authors: C
authors: Wang
authors: Shuhong
authors: S
authors: Xu
authors: Haibao
authors: H
authors: Shao
authors: Xiaoyan
authors: X
authors: Lin
authors: Zhuyuan
authors: Z
authors: Wang
authors: Yiping
authors: Y
authors: Cui
mesh_terms: D001331:Automation; D019187:Cadmium Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000302:isolation & purification*; D000431:Ethanol / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D014867:Water; D000431:Ethanol; D013691:Tellurium; C028337:cadmium telluride
references: Nano Lett. 2004 Jan 1;4(1):11-18
references: 28890669
references: J Am Chem Soc. 2006 Aug 9;128(31):10171-80
references: 16881647
references: Small. 2007 Jul;3(7):1152-6
references: 17534993
references: Chemphyschem. 2008 Jun 23;9(9):1309-16
references: 18481340
references: Langmuir. 2010 Jan 19;26(2):633-8
references: 20027995