The photoluminescent properties of allylamine terminated silicon nanocrystals (Si‐NCs) are investigated. Chloride surface terminated Si‐NCs of different sizes react with allylamine yielding NCs that ...exhibit size independent blue luminescent NCs. NCs were characterized using X‐ray diffraction, Fourier transformed infrared spectroscopy, photoluminescence spectroscopy, and dynamic light scattering.
Reaction scheme summarizing surface modification approach used for the present study.
This article describes the synthesis of silicon nanocrystals (Si‐NCs) and their functionalization with three different surface groups. We also report the effects of various surface groups on the ...optical properties of Si‐NCs with similar particle size distribution. The Si‐NCs were characterized using various methods such as XRD, FT‐IR, transmission electron microscopy, and fluorescence spectroscopy.
Butylamine (blue), trioctylphosphine oxide (yellow), and dodecyl (red) functionalized Si‐NCs dispersed in toluene under UV‐illumination.
Silicon nitride nanocrystals (NCs) have been prepared via in situ nitridation of magnesium followed by a metathesis reaction with sol-gel derived silica particles. Highly luminescent, freestanding ...β-Si(3)N(4) NCs with complex surface chemistry dominated by Si-H and N-H moieties were isolated upon etching with hydrofluoric acid.
Surface chemistry can play an important role in determining the optical properties of silicon nanocrystals. On this page, referring to the article by Mita Dasog and Jonathan G. C. Veinot (pp. ...1844–1846) it is shown that by changing the surface of silicon nanocrystals, their emission color can be tuned. Hydride surface terminated silicon nanocrystals emit red/orange whereas, when surface groups attached through nitrogen atoms are present they emit blue. Chloride atoms quench the photoluminescence. The photoluminescence properties are shown as a background together with a transmission electron micrograph image of silicon nanocrystals.
Ceramic nanoparticles that exhibit a plasmonic response are promising next-generation photonic materials. In this contribution, a solid-state metathesis method has been reported for the synthesis of ...group IVB nitride (TiN, ZrN, and HfN) nanocrystals. A high-temperature (1000 ºC) reaction between group IVB metal oxide (TiO2, ZrO2, and HfO2) nanoparticles and magnesium nitride powder yielded nitride nanocrystals that were dispersible in water. A localized surface plasmonic resonance was observed in the near-infrared region for TiN and in the visible region for ZrN and HfN nanocrystals. The frequency of the plasmon resonance was dependent on the refractive index of the solvent and the nanocrystal size.
Ceramic nanoparticles that exhibit a plasmonic response are promising next‐generation photonic materials. In this contribution, a solid‐state metathesis method has been reported for the synthesis of ...Group 4 nitride (TiN, ZrN, and HfN) nanocrystals. A high‐temperature (1000 °C) reaction between Group 4 metal oxide (TiO2, ZrO2, and HfO2) nanoparticles and magnesium nitride powder yielded nitride nanocrystals that were dispersible in water. A localized surface plasmonic resonance was observed in the near‐infrared region for TiN and in the visible region of light for ZrN and HfN nanocrystals. The frequency of the plasmon resonance was dependent on the refractive index of the solvent and the nanocrystal size.
Plasmon‐Montage: Mittels Festkörper‐Metathese wurden TiN‐, ZrN‐ und HfN‐Nanokristalle synthetisiert. Die Kristalle sind dispergierbar in Wasser und haben eine lokalisierte Oberflächenplasmonenresonanz im nahen Infrarot‐ (TiN) und sichtbaren Bereich (ZrN, HfN). Dadurch können sie beispielsweise in der Photothermaltherapie oder in plasmonverstärkten Sensoren eingesetzt werden.
Abstract
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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