Large-Scale Production of CdSe Nanocrystal by a Continuous Flow Reactor

Kawa, Manabu; Morii, Hidekazu; Ioku, Atau; Saita, Soichiro; Okuyama, Kikuo

doi:10.1023/a:1024434502893

Cited by 30 publications

(26 citation statements)

References 5 publications

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“…The 99% TOPO contains some of the same impurities, in smaller amounts 67,72. Although such impurities were believed to influence the quality, morphology, and growth kinetics of QDs and QRs (see below),14,16,73 none of the active impurities had been specifically identified until our recent preliminary communication of this work 72…”

Section: Introductionmentioning

confidence: 97%

Spectroscopic Identification of Tri-n-octylphosphine Oxide (TOPO) Impurities and Elucidation of Their Roles in Cadmium Selenide Quantum-Wire Growth

Wang¹,

Tang²,

Kao³

et al. 2009

J. Am. Chem. Soc.

147

239

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Tri-n-octylphosphine oxide (TOPO) is the most commonly used solvent for the synthesis of colloidal nanocrystals. Here we show that the use of different batches of commercially obtained TOPO solvent introduces significant variability into the outcomes of CdSe quantum-wire syntheses. This irreproducibility is attributed to varying amounts of phosphorus-containing impurities in the different TOPO batches. We employ 31P NMR to identify 10 of the common TOPO impurities. Their beneficial, harmful, or negligible effects on quantum-wire growth are determined. The impurity di-n-octylphosphinic acid (DOPA) is found to be the important beneficial TOPO impurity for the reproducible growth of high-quality CdSe quantum wires. DOPA is shown to beneficially modify precursor reactivity through ligand substitution. The other significant TOPO impurities are ranked according to their abilities to similarly influence precursor reactivity. The results are likely of general relevance to most nanocrystal syntheses conducted in TOPO.

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Section: Introductionmentioning

confidence: 97%

Spectroscopic Identification of Tri-n-octylphosphine Oxide (TOPO) Impurities and Elucidation of Their Roles in Cadmium Selenide Quantum-Wire Growth

Wang¹,

Tang²,

Kao³

et al. 2009

J. Am. Chem. Soc.

147

239

View full text Add to dashboard Cite

show abstract

“…However, there are few studies concerning continuous operation in order to meet increasing demand for nanoparticles in the near future. In one of the few examples, Kawa et al [16] used a continuous flow reactor to prepare monodisperse CdSe nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of silver nanoparticles using the SPG membrane emulsification technique

Kakazu

Murakami

Akamatsu

et al. 2010

Journal of Membrane Science

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“…Kawa et al did synthesis of CdSe by a continuous flow reactor of metal for the large production of nanoparticles. 103 The reaction was carried out at high temperature (350 • C) by TOPO method. Syringe pumps were connected with the reactor for the continuous flow of the reactants.…”

Section: Synthesis Of Nanomaterials In Microreactormentioning

confidence: 99%

Development in Microreactor Technology for Nanoparticle Synthesis

2010

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Microreactor technology is a new concept of chemical synthesis for nanoparticle production. The "state of the art" in microreactor fabrication and its application to the synthesis of nanoparticles is reviewed. The microfluidic concepts, the materials and technologies for microreactor manufacture, with particular emphasis on polymers and microreplication techniques, and their application to the synthesis of various nanomaterials in microreactors are presented. The unique synthesis properties of various nanoparticles using a microfluidic process as well as broader impact in term of nanomaterials engineering, i.e., selectivity and monodispersity, reduced amount of chemicals, fast reaction, minimum cost, a better control of the process, minimum waste and reduced amounts of reaction byproducts and improved safety, are discussed in comparison with the traditional wet-chemical batch synthesis approach.

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Large-Scale Production of CdSe Nanocrystal by a Continuous Flow Reactor

Cited by 30 publications

References 5 publications

Spectroscopic Identification of Tri-n-octylphosphine Oxide (TOPO) Impurities and Elucidation of Their Roles in Cadmium Selenide Quantum-Wire Growth

Spectroscopic Identification of Tri-n-octylphosphine Oxide (TOPO) Impurities and Elucidation of Their Roles in Cadmium Selenide Quantum-Wire Growth

Preparation of silver nanoparticles using the SPG membrane emulsification technique

Development in Microreactor Technology for Nanoparticle Synthesis

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