On-line analysis of CdSe nanoparticle formation in a continuous flow chip-based microreactor

Krishnadasan, Siva H.; Tovilla, Jorge A.; Vilar, Ramón; deMello, Andrew J.; deMello, John C.

doi:10.1039/b401559b

Cited by 134 publications

(107 citation statements)

References 24 publications

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“…[21][22][23][24][25][26][27] Of particular interest from a technological standpoint are the effects of quantum confinement of the bulk exciton that result in size-tuneable optical absorption and emission properties. [28][29][30][31][32][33][34] As the field of "nanotechnology" has started to emerge, there has been a movement from an academic interest to one based on the implementation of these materials in electronic device applications, such as light-emitting devices, [35] photovoltaics, [36] and lasers. [37] Therefore, in addition to the control of particle size and chemical composition, the focus on the development of straightforward synthetic routes to highly processable, high-purity materials with a narrow size distribution and completely derivatized surface remains at the forefront of this area of science.…”

Section: Resultsmentioning

confidence: 99%

Control of Metal‐Ion Composition in the Synthesis of Ternary II‐II′‐VI Nanoparticles by Using a Mixed‐Metal Cluster Precursor Approach

DeGroot

Rösner²,

Corrigan

2006

Chemistry A European J

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The ternary molecular nanoclusters [Zn(x)Cd(10-x)Se4(SePh)12(PnPr3)4] (x = 1.8, 1 a; x = 2.6, 1 b) were employed as single-source precursors for the synthesis of high-quality hexagonal Zn(x)Cd(1-x)Se nanocrystals. The tellurium clusters [Zn(x)Cd(10-x)Te4(TePh)12(PnPr3)4] (x = 1.8, 2 a; x = 2.6, 2 b) are equally convenient precursors for the synthesis cubic Zn(x)Cd(1-x)E nanoparticles. The thermolysis of the cluster molecules in hexadecylamine provides an efficient system in which the inherent metal-ion stoichiometry of the clusters is retained in the nanocrystalline products, whilst also affording control of particle size within the 2-5 nm range. In all cases, the nanoparticles are monodisperse, and luminescence spectra exhibit emission energies close to the absorption edge. Analysis of the optical spectra and X-ray diffraction patterns of these materials indicates a metal-ion concentration gradient within the structures of the nanocrystals, with Zn(II) ions predominantly located near the surface of the particles.

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Section: Resultsmentioning

confidence: 99%

Control of Metal‐Ion Composition in the Synthesis of Ternary II‐II′‐VI Nanoparticles by Using a Mixed‐Metal Cluster Precursor Approach

DeGroot

Rösner²,

Corrigan

2006

Chemistry A European J

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“…[32,46,76,[81][82][83][84] In den ursprünglichen Versuchen von Nakamura et al erfolgte die CdSe-QD-Synthese kontinuierlich in einer Quarzglaskapillare (200-500 mm Innendurchmesser) in einem Ölbad bei Temperaturen zwischen 230 und 300 8C, wobei die Reaktionsverweilzeiten anhand der Volumenströme und der Kapillargröße bestimmt wurden.…”

Section: Synthese Von Halbleiternunclassified

Mikrofluidik in der anorganischen Chemie

2010

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In den letzten Jahren hat die Mikrofluidik in der Chemie stark an Bedeutung gewonnen. Miniaturisierte chemische Vorrichtungen ermöglichen einen kontrollierten Flüssigkeitstransport und schnelle chemische Reaktionen und sind darüber hinaus Kosten sparend, wenn man sie mit konventionellen Reaktoren vergleicht. Sowohl in der (Bio‐)Analytik als auch in der organischen Synthese werden diese Vorteile bereits ausgiebig genutzt, weniger hingegen in der anorganische Chemie und den Materialwissenschaften. Dennoch wird diese Thematik auch in der Anorganik bei der Entwicklung von Mikroreaktoren für die Trennung und selektive Extraktion von Metallionen gestreift. Bei Funktionsmaterialien wird die Mikrofluidik hauptsächlich für Verbesserungen in der Synthese von Nanopartikeln (besonders von Metall‐, Metalloxid‐ und Halbleiternanopartikeln) eingesetzt. Mikrofluidiktechniken können auch für die Entwicklung von komplizierteren anorganischen (Hybrid‐)Materialien genutzt werden.

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“…In the nanoparticle (NP) synthesis, microfluidic reactors have been used successfully to control size, shape and crystal structure [25,28,31,32], and the growth of nanoparticles [33] and to investigate the NP formation mechanism [25,26,34,35]. In this article, a sequential microfluidic process is developed for the synthesis of core-shell Co@Au NPs with controlled shell thickness via a combination of the displacement method and the reduction-deposition process.…”

Section: Introductionmentioning

confidence: 99%

Shell-driven Fine Structure Transition of Core Materials in Co@Au Core-shell Nanoparticles

Song

Wang

et al. 2012

Nano-Micro Lett.

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Abstract:Co@Au core shell nanoparticles (NPs) of different shell thicknesses were fabricated by a combination of the displacement process and the reduction-deposition process in a microfluidic reactor. The effect of the shell thickness on the fine structures (local atom arrangement) of core materials was investigated by X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The results indicate that the shell thickness affects the fine structure of the core materials by causing atomic re-arrangement between the hexagonal close pack (hcp) and the face centered cubic (fcc) structure, and forming Co-Au bonds in the core-shell interface.

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On-line analysis of CdSe nanoparticle formation in a continuous flow chip-based microreactor

Cited by 134 publications

References 24 publications

Control of Metal‐Ion Composition in the Synthesis of Ternary II‐II′‐VI Nanoparticles by Using a Mixed‐Metal Cluster Precursor Approach

Control of Metal‐Ion Composition in the Synthesis of Ternary II‐II′‐VI Nanoparticles by Using a Mixed‐Metal Cluster Precursor Approach

Mikrofluidik in der anorganischen Chemie

Shell-driven Fine Structure Transition of Core Materials in Co@Au Core-shell Nanoparticles

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