Size-Dependent Oxidation of Monodisperse Silicon Nanocrystals with Allylphenylsulfide Surfaces

Rinck, Julia; Schray, Dirk; Kübel, Christian; Powell, Annie K.; Ozin, Geoffrey A.

doi:10.1002/smll.201401965

Cited by 20 publications

(41 citation statements)

References 39 publications

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“…Silyl radicals react with the terminal carboncarbon bond to induce as table SiÀCb ond. [88,125] One of those reports shows the effect on photoluminescence of an aged silanized Si surface.Z ou and Kauzlarich [88] prepared silanized Si particles through amulti-step functionalization:s tarting with chloride terminated Si, hydroxy terminated particles were obtained after the addition of methanol and then water. [120] 2) Functionalization of halide-terminated silicon (Si À Cl) is mostly achieved via the Grignard reaction through the addition of RMgBr or RLi (when Ri sa na lkyl group).…”

Section: Silicon Oxidation and Post-synthesis Surface Modificationmentioning

confidence: 99%

Silicon‐Based Dielectric Metamaterials: Focus on the Current Synthetic Challenges

et al. 2018

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Metamaterials have optical properties that are unprecedented in nature. They have opened new horizons in light manipulation, with the ability to bend, focus, completely reflect, transmit, or absorb an incident wave front. Optically active metamaterials in particular could be used for applications ranging from 3D information storage to photovoltaic cells. Silicon (Si) particles are some of the most promising building blocks for optically active metamaterials, with high scattering efficiency coupled to low light absorption for visible frequencies. However, to date ideal Si building blocks cannot be produced by bulk synthesis techniques. The key is to find a synthetic route to produce Si building blocks between 75-200 nm in diameter of uniform size and shape, that are crystalline, have few impurities, and little to no porosity. This Review provides a theoretical background on Si optical properties for metamaterials, an overview of current synthetic methods and gives direction towards the most promising routes to ideal Si particles for metamaterials.

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Section: Silicon Oxidation and Post-synthesis Surface Modificationmentioning

confidence: 99%

Silicon‐Based Dielectric Metamaterials: Focus on the Current Synthetic Challenges

et al. 2018

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“…[31] For size-sorted samples exposed to air for the same amount of time, it was found that the PL QY of larger ncSi fractions was most sensitive to oxidation, (Figure 4a). [32] By monitoring the time dependent changesi nt he PL wavelength and QY of ncSi exposed to dry and humid argon and oxygen, the oxidation was provent ob ew ater-assisted (Figure 4b). [33] The more pronounced PL blueshift of the larger ncSi was associated with the more pronounced shrinkage of the ncSi core due to oxidation, even thought he smaller surface curvature is expected to impede the initial stages of reaction with oxygen and water.…”

Section: Oxidationmentioning

confidence: 97%

“…In practice, the PL would blueshift and the QY would decrease with time of exposure to air, and the oxidation is often assisted by water . For size‐sorted samples exposed to air for the same amount of time, it was found that the PL QY of larger ncSi fractions was most sensitive to oxidation, (Figure a) . By monitoring the time dependent changes in the PL wavelength and QY of ncSi exposed to dry and humid argon and oxygen, the oxidation was proven to be water‐assisted (Figure b) .…”

Section: Size Effect On Stability and Cytotoxicitymentioning

confidence: 99%

Silicon Nanocrystals: It's Simply a Matter of Size

et al. 2016

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Composed of one of the most earth abundant, low cost and least toxic elements, silicon nanocrystals exhibit quantum and spatial confinement effects when their size is diminished to that of the exciton, around 5 nm. With the recent discovery of various means for synthesizing and separating silicon nanocrystals into narrow size distribution mono‐dispersions, it became possible for the first time to implement more deeply analytical studies of their size‐dependent chemical, physical and biological properties than was possible with poly‐dispersions. In this article we take a look at some recent studies of mono‐dispersions of silicon nanocrystals where it is apparent that size really matters. With this newfound knowledge we imagine the new directions that the field may take in the future. The topics covered include how silicon nanocrystal size is manifest on their (i) surface structure and reactivity, (ii) optical and electronic properties, (iii) chemical and photochemical stability, and (iv) biochemical and cytotoxicity behavior. The article concludes with a vision of what the future might hold for this important class of nanocrystals.

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“…Dieser Effekt ergibt sich vermutlich aus der damit verbundenen Senkung der C-X-Schwingungsfrequenz. [41] Bis auf wenige Ausnahmen [42] bençtigt die thermische Hydrosilylierung hohe Reaktionstemperaturen, weshalb fast ausschließlich hochsiedende Alkene und Alkine auf SiNKOberflächen gebunden werden kçnnen. Daneben existiert die photochemische Hydrosilylierung als Alternative,d eren Einsatzfähigkeit allerdings durch grçßenabhängige Reaktivität der SiNKs,I ntoleranz gegenüber funktionellen Gruppen, wie auch die bençtigten langen Reaktionszeiten limitiert ist.…”

Section: Hydrosilylierungunclassified

Silicium‐Nanokristalle und Silicium‐Polymer‐Hybridmaterialien: Synthese, Oberflächenmodifikation und Anwendungen

et al. 2015

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Aufgrund der hohen Verfügbarkeit in der Erdkruste und seiner geringen Toxizität im Vergleich zu einigen anderen Halbleitern ist Silicium der Vorreiter in der Elektroindustrie. Daher finden Silicium‐Nanokristalle (SiNKs) insbesondere aufgrund ihrer einzigartigen optoelektronischen Eigenschaften ein hohes Interesse in der Halbleiterindustrie und sie haben das Potenzial, die toxischen Quantenpunkte (Elemente der Gruppen II–VI und III–V) zu substituieren. Dennoch erhielten SiNKs wegen ihrer geringeren Photolumineszenz(PL)‐Quantenausbeuten, einer schwierig zu erzielenden monodispersen Partikelverteilung und ihrer Oxidationsanfälligkeit nicht dieselbe Aufmerksamkeit wie ihre schwermetallhaltigen Analoga. Daher wurde vermehrt an der Funktionalisierung von SiNK‐Oberflächen geforscht und die genannten Faktoren im Wesentlichen verbessert. Vor diesem Hintergrund fassen wir in diesem Aufsatz die neuesten Entwicklungen in der Funktionalisierung von SiNK‐Oberflächen, beschriebene SiNK/Polymer‐Hybridmaterialien und deren Anwendungen in den Bereichen Sensorentwicklung, Leuchtdioden, Katalyse und Akkumulatoren zusammen.

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Size-Dependent Oxidation of Monodisperse Silicon Nanocrystals with Allylphenylsulfide Surfaces

Cited by 20 publications

References 39 publications

Silicon‐Based Dielectric Metamaterials: Focus on the Current Synthetic Challenges

Silicon‐Based Dielectric Metamaterials: Focus on the Current Synthetic Challenges

Silicon Nanocrystals: It's Simply a Matter of Size

Silicium‐Nanokristalle und Silicium‐Polymer‐Hybridmaterialien: Synthese, Oberflächenmodifikation und Anwendungen

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