Phosphine-Free Synthesis of High-Quality CdSe Nanocrystals in Noncoordination Solvents: “Activating Agent” and “Nucleating Agent” Controlled Nucleation and Growth

2009 ◽  
Vol 113 (20) ◽  
pp. 8701-8709 ◽  
Author(s):  
Ming Sun ◽  
Xiurong Yang
Keyword(s):  
Nucleating Agent ◽  
Nucleation And Growth ◽  
Cdse Nanocrystals ◽  
High Quality ◽  
Activating Agent ◽  
Controlled Nucleation

scholarly journals Controlled Nucleation and Growth of Carbon Nitride Films on CNT Fiber Fabric for Photoelectrochemical Applications

2021 ◽  
pp. 2000265
Author(s):  
Neeta Karjule ◽  
Moumita Rana ◽  
Menny Shalom ◽  
Jesús Barrio ◽  
Juan José Vilatela
Keyword(s):  
Carbon Nitride ◽  
Nucleation And Growth ◽  
Controlled Nucleation ◽  
Cnt Fiber ◽  
Fiber Fabric

Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays

2005 ◽  
Vol 109 (35) ◽  
pp. 16684-16694 ◽  
Author(s):  
Gyula Eres ◽  
Anika A. Kinkhabwala ◽  
Hongtao Cui ◽  
David B. Geohegan ◽  
Alexandar A. Puretzky ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Molecular Beam ◽  
Nucleation And Growth ◽  
Nanotube Arrays ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Carbon Nanotube Arrays ◽  
Vertically Aligned ◽  
Controlled Nucleation

High-yield synthesis of CsPbBr3 nanoparticles: Diphenylphosphine as a reducing agent and its effect in Pb-seeding nucleation and growth

2021 ◽  
Author(s):  
Eder Antonio Castillo-Ruiz ◽  
Diana Fabiola Garcia-Gutierrez ◽  
Domingo Ixcóatl Garcia-Gutierrez
Keyword(s):  
Nucleation And Growth ◽  
Reducing Agent ◽  
High Yield ◽  
Reaction Yield ◽  
High Quality ◽  
Stabilizing Agents ◽  
Nucleation Sites ◽  
Nucleation Mechanisms ◽  
Attractive Option ◽  
Mass Increment

Abstract Based on the reported nucleation mechanisms for CsPbX3 and II-VI/IV-VI quantum dots, CsPbBr3 nanoparticles with a high reaction-yield, up to 393% mass-increment, were synthesized by the hot-injection method. The introduction of diphenylphosphine (DPP) as a reducing agent improved nanoparticle nucleation and growth, giving out evidence for Pb-seeding in CsPbBr3 nanoparticles formation. Additionally, a clear influence of the DPP in a CsPbBr3-Cs4PbBr6 incomplete phase transformation was observed, marked by the appearance of several PbBr2 nanoparticles, indicating the need for an improved ratio between the stabilizing agents and the precursors, due to the increased number of nucleation sites produced by the DPP. The resulting CsPbBr3 nanoparticles showed high quality, as they displayed 70%-90% photoluminescence quantum yield (PLQY), narrow size distribution with an average nanoparticle size of ~10 nm and the characteristic cubic morphology reported in previous works. This increment in CsPbBr3 nanoparticles’ reaction yield will contribute to making them a more attractive option for different optoelectronic applications.

Effect of Controlled Ice Nucleation on Primary Drying Stage and Protein Recovery in Vials Cooled in a Modified Freeze-Dryer

2009 ◽  
Vol 131 (7) ◽  
Author(s):  
Stéphanie Passot ◽  
Ioan Cristian Tréléa ◽  
Michèle Marin ◽  
Miquel Galan ◽  
G. John Morris ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Nucleating Agent ◽  
Ice Nucleation ◽  
Residual Water ◽  
Activity Recovery ◽  
Protective Medium ◽  
Ultrasound Technology ◽  
Controlled Nucleation ◽  
The Impact ◽  
Freeze Dryer

The freezing step influences lyophilization efficiency and protein stability. The main objective of this work was to investigate the impact on the primary drying stage of an ultrasound controlled ice nucleation technology, compared with usual freezing protocols. Lyophilization cycles involving different freezing protocols (applying a constant shelf cooling rate of 1°C/min or 0.2°C/min, putting vials on a precooled shelf, and controlling nucleation by ultrasounds or by addition of a nucleating agent) were performed in a prototype freeze-dryer. Three protective media including sucrose or maltodextrin and differing by their thermal properties and their ability to preserve a model protein (catalase) were used. The visual aspect of the lyophilized cake, residual water content, and enzymatic activity recovery of catalase were assessed after each lyophilization cycle and after 1 month of storage of the lyophilized product at 4°C and 25°C. The freezing protocols allowing increasing nucleation temperature (precooled shelf and controlled nucleation by using ultrasounds or a nucleating agent) induced a faster sublimation step and higher sublimation rate homogeneity. Whatever the composition of the protective medium, applying the ultrasound technology made it possible to decrease the sublimation time by 14%, compared with the freezing method involving a constant shelf cooling rate of 1°C/min. Concerning the enzyme activity recovery, the impact of the freezing protocol was observed only for the protective medium involving maltodextrin, a less effective protective agent than sucrose. Higher activity recovery results were obtained after storage when the ultrasound technology or the precooled shelf method was applied. Controlling ice nucleation during the freezing step of the lyophilization process improved the homogeneity of the sublimation rates, which will, in turn, reduce the intervial heterogeneity. The freeze-dryer prototype including the system of controlled nucleation by ultrasounds appears to be a promising tool in accelerating sublimation and improving intrabatch homogeneity.

Phosphine-Free Synthesis of High Quality CdSe Nanocrystals and Their Optical Properties

2010 ◽  
Vol 26 (03) ◽  
pp. 691-694
Author(s):  
ZHAO Hui-Ling ◽  
◽  
◽  
SHEN Huai-Bin ◽  
WANG Hong-Zhe ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cdse Nanocrystals ◽  
High Quality

scholarly journals Graphene stimulates the nucleation and growth rate of NaCl crystals from hypersaline solution via membrane crystallization

2020 ◽  
Vol 6 (6) ◽  
pp. 1723-1736
Author(s):  
Maria Luisa Perrotta ◽  
Francesca Macedonio ◽  
Elena Tocci ◽  
Lidietta Giorno ◽  
Enrico Drioli ◽  
...  
Keyword(s):  
Growth Rate ◽  
Nucleation And Growth ◽  
High Quality ◽  
Hypersaline Water

Advanced graphene engineered membranes designed for sustainable crystallization of high-quality crystals from hypersaline water.

scholarly journals Synthesis of High-Quality Carboxyl End-Functionalized Poly(3-hexylthiophene)/CdSe Nanocomposites

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
He-Ping Shi ◽  
Da-Wei Lin ◽  
Rui-feng Wu
Keyword(s):  
Particle Size ◽  
Charge Transfer ◽  
Crystalline Structure ◽  
Environmentally Friendly ◽  
Cdse Nanocrystals ◽  
High Quality ◽  
Efficient Charge ◽  
Controllable Particle Size ◽  
Better Than

Carboxyl end-functionalized poly(3-hexylthiophene) (P3HT-COOH) was grafted chemically with CdSe nanocrystals (NCs) by a phosphine-free method. The particle quality of P3HT-COOH/CdSe nanocomposites was better than that of P3HT/CdSe nanocomposites, which were synthesized using the same method. Nanocrystals with controllable particle size exhibited a wurtzite crystalline structure and showed excellent nanocrystal dispersion in the P3HT-COOH matrix. Photoluminescence (PL) characterization performed on nanocomposites suggested the efficient charge transfer at the P3HT-COOH/CdSe interface. This approach based on the phosphine-free method is not only environmentally friendly but also highly efficient.

Facile non-injection synthesis of high quality CZTS nanocrystals

RSC Advances ◽  
2014 ◽  
Vol 4 (34) ◽  
pp. 17667-17670 ◽  
Author(s):  
Yuanhao Gao ◽  
Huaizhi Yang ◽  
Yange Zhang ◽  
Jing Li ◽  
Hongxiao Zhao ◽  
...  
Keyword(s):  
High Quality ◽  
Activating Agent ◽  
Czts Nanocrystals

High quality CZTS nanocrystals were facilely synthesized. The uniqueness is the use of KTB as sulfur activating agent and stabilizer.

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