Improved Optoelectronic Properties of Silicon Nanocrystals/Polymer Nanocomposites by Microplasma-Induced Liquid Chemistry

Mitra, Somak; Cook, Steffan; Švrček, Vladimír; Blackley, Ross A.; Zhou, Wuzong; Kovač, Janez; Cvelbar, Uroš; Mariotti, Davide

doi:10.1021/jp400938x

Cited by 37 publications

(64 citation statements)

References 63 publications

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“…4 It also opens up the prospects of technological applications, such as gasphase microreactors, which while analogous to their microfluidic counterparts with multiphase emulsion flows, [5][6][7] plasma-liquid systems offer additional chemistries, materials, and a route to large scale implementation. 3,8 In plasma medicine, plasma activated droplets will also enhance the scope for remote delivery of therapeutic agents to biological tissue and organs. 9 To maintain the stability and low temperature of the plasma, a small diameter (2 mm) capillary is required, while rf excitation allows steady-state non-thermal equilibrium operation.…”

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confidence: 99%

Controlled microdroplet transport in an atmospheric pressure microplasma

Maguire

Mahony

Kelsey

et al. 2015

Applied Physics Letters

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We report the controlled injection of near-isolated micron-sized liquid droplets into a low temperature He-Ne steady-state rf plasma at atmospheric pressure. The H 2 O droplet stream is constrained within a 2 mm diameter quartz tube. Imaging at the tube exit indicates a log-normal droplet size distribution with an initial count mean diameter of 15 m falling to 13 m with plasma exposure. The radial velocity profile is approximately parabolic indicating near laminar flow conditions with the majority of droplets travelling at > 75% of the local gas speed and having a plasma transit time of < 100 s. The maximum gas temperature, determined from nitrogen spectral lines, was below 400 K and the observed droplet size reduction implies additional factors beyond standard evaporation, including charge and surface chemistry effects. The successful demonstration of controlled microdroplet streams opens up possibilities for gas-phase microreactors and remote delivery of active species for plasma medicine.

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mentioning

confidence: 99%

Controlled microdroplet transport in an atmospheric pressure microplasma

Maguire

Mahony

Kelsey

et al. 2015

Applied Physics Letters

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“…The obtained values of dielectric constant (ε′) and dielectric loss (ε″) were employed to obtain the loss tangent (Tan δ) using the relation ε ε δ ″ = ′ tan (10) where, δ is the phase angle between the electric field and the polarization of dielectric. The variation of dissipation factor, tan δ, as a function of Cs 2 ZnO 2 loading, is shown in Figure 16.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Opto-Electrical Characteristics of Poly(vinyl alcohol)/Cesium Zincate Nanodielectrics

Subramani

Siddaramaiah

2015

J. Phys. Chem. C

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Polymer nanocomposites for electro-optics are known to offer novel material morphologies and unique device geometries, thereby enhancing the device performance. In this study, we report the successful fabrication of one such blue-green fluorescent poly(vinyl alcohol) (PVA)/cesium zincate (Cs 2 ZnO 2 ) nanocomposite by solution intercalation technique. The optoelectronic properties of prepared films were probed with the intent to establish the effect of nanointegrates on optical and electrical characteristics of particle stabilizing PVA. The optical absorbance studies revealed the UV absorbent nature of PVA/Cs 2 ZnO 2 films exhibiting a steep UV absorption coupled with high visible transmission. The optical parameters of nanocomposite films, including absorption/extinction coefficients, optical band gap, complex refractive index (RI), and dielectric functions besides optical conductivity were evaluated, which supports the dopantdependent optical properties of PVA with a scope for band gap engineering. The dispersion and functionalization of nanofillers were characterized by FESEM. The integrated fillers induced a broad blue−green luminescence (2.88−2.58 eV) in the emission spectrum of PVA. The structural aspects were probed by FTIR studies, while charge transport properties were valued by dielectric studies. The dielectric properties (dielectric storage and dielectric loss), AC conductivity, and charge dissipation were found to increase with nanofiller content and decrease with frequency. ■ INTRODUCTIONPolymer nanocomposites are of particular interest in photonics and optoelectronics, owing to their excellent ability to harness unique material properties arising from the synergistic combination of opto-electrical effectiveness of the nanoinclusions, alongside admirable processability of the polymer systems. The unearthing of compounds with interesting material properties often opens up novel research pathways, eventually leading to new technology. A proper understanding of unearthed properties and their filler-dependent tuning may lead to hybrid devices with advanced properties. This is the central theme in smart material technology, which involves efforts to tune the material properties according to specific application requirements. This involves the simultaneous and perhaps synergistic tailoring of various properties, which can be nontrivial. Polymer nanocomposite technology is one such area, which utilizes the unique material properties arising from sizedependent material properties to design/develop and fabricate materials with unique physicochemical properties for specified applications. In recent years, polymer-encapsulated transparent semiconducting inorganic nanofillers have attracted a great deal of scientific and technological interest as advanced technological materials, especially in the field of photonics and optoelectronics. 1−5 Polymer nanocomposites are also extensively employed in applications related to optical storage systems owing to their exceptionally high thermal stability and filler-depend...

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“…Um diese Inhomogenität zu vermeiden entwickelten Mitra et al eine bei Atmosphärendruck durchführbare Mikroplasma-Technik, die es erlaubt, SiNKs mit Poly(3,4-ethylendioxythiophen)-Polystyrolsulfonat (PEDOT:PSS) zu bedecken (Abbildung 8a). [67] Dadurch konnten die SiNK-Oberflächen gleichmäßig mit Polymer Schema 7. Bromierung von Hydrid-terminierten SiNKs mit NBS und anschließende Alkoxylierung.…”

Section: Sink-polymer-hybridmaterialienunclassified

“…Abdruck in veränderter Form mit Genehmigung der American Chemical Society. [67] Angewandte Chemie Aufsätze terial zum Einfangen von elektrischen Ladungen in Prototypen, wie Metall-Isolator-Halbleiter-Apparaten und Dünn-film-Feldeffekttransistoren, getestet wurde. [70] Choi et al synthetisierten SiNK-Polystyrol-Hybridmaterialien mit unterschiedlichen Nanopartikel-und Polymerkonzentrationen.…”

Section: Sink-polymer-hybridmaterialienunclassified

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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Improved Optoelectronic Properties of Silicon Nanocrystals/Polymer Nanocomposites by Microplasma-Induced Liquid Chemistry

Cited by 37 publications

References 63 publications

Controlled microdroplet transport in an atmospheric pressure microplasma

Controlled microdroplet transport in an atmospheric pressure microplasma

Opto-Electrical Characteristics of Poly(vinyl alcohol)/Cesium Zincate Nanodielectrics

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

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