Enhanced fluorescence, morphological and thermal properties of CdSe/ZnS quantum dots incorporated in silicone resin.

Peningkatan sifat fluoresensi, morfologi, dan termal titik kuantum CdSe/ZnS yang diinkorporasikan ke dalam resin silikon.

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ID: 687
2013
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Abstract
Our research focused on the morphological and optical properties of core/shell cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots incorporated in silicone resin. After dispersing ligand-coated quantum dots into Dow Corning two-component silicone resins (OE6630A and OE6630B at 1:4 mixing ratio by weight), the resins were cured at 150 degrees C for 1.5 hours to produce the quantum dot-silicone resin nanocomposites. The optical, morphological and thermal properties of the quantum dot incorporated in silicone resin were investigated by ultraviolet-visible, fluorescence, atomic force microscopy, field emission scanning electron microscopy, differential scanning calorimetry and thermogravimetric analysis. When the quantum dots, originally coated with trioctylamine ligand, were transferred from a chloroform solvent to methyl phenyl silicone oil and silicone resins of high viscosity, the quantum dots showed increased turbidity and lowered fluorescence intensity. Fluorescence enhancement was investigated by using various functional ligands such as poly(1, 1-dimethyl silazane) (multi-silazane), hexamethylenediamine (diamine), cysteamine (amino-thiol), triethylsilane (reactive hydrosilane), hexamethyldisilazane, nonamethyltrisilazane, octamethylcyclotetrasilazane (reactive amines). The results showed that the reactive amines were good additive ligands for enhancing the fluorescence of CdSe/ZnS quantum dots dispersed in the silicone resins, providing 1.2-2.48 Im/W and 4.2-5.56% higher luminous efficiency and photoluminescence conversion efficiency, respectively. We speculate that these reactive amines donate electrons to the surface electron traps, thereby reducing charge recombination. In addition, quantum dots aggregate to form quantum dot clusters with a relatively homogeneously dispersed in the silicone resin matrices, showing good emission properties due to surface passivation and good colloidal stability with the addition of silazane compounds to the resin. Furthermore, the addition of silazane compounds to quantum dots-silicone resin system also shows the improved thermal stability of the as-synthesized nanocomposites.
Penelitian kami berfokus pada sifat morfologi dan optik dari titik kuantum (*quantum dots*) inti/cangkang kadmium selenida/seng sulfida (CdSe/ZnS) yang diinkorporasikan ke dalam resin silikon. Setelah mendispersikan titik kuantum berlapis ligan ke dalam resin silikon dua komponen Dow Corning (OE6630A dan OE6630B dengan rasio pencampuran berat 1:4), resin tersebut dikeraskan pada suhu 150 °C selama 1,5 jam untuk menghasilkan nanokomposit titik kuantum-resin silikon. Sifat optik, morfologi, dan termal dari titik kuantum yang diinkorporasikan ke dalam resin silikon diinvestigasi menggunakan spektroskopi ultraviolet-tampak, fluoresensi, mikroskopi gaya atom, mikroskopi elektron pemindai emisi medan, kalorimetri pemindaian diferensial, dan analisis termogravimetri. Ketika titik kuantum, yang awalnya dilapisi dengan ligan trioktilamina, dipindahkan dari pelarut kloroform ke minyak metil fenil silikon dan resin silikon berviskositas tinggi, titik kuantum tersebut menunjukkan peningkatan kekeruhan dan penurunan intensitas fluoresensi. Peningkatan fluoresensi diinvestigasi dengan menggunakan berbagai ligan fungsional seperti poli(1, 1-dimetil silazana) (multi-silazana), heksametilenadiamina (diamina), sisteamina (amino-tiol), trietilsilana (hidrosilana reaktif), heksametildisilazana, nonametiltrisilazana, dan oktametilsiklotetrasilazana (amina reaktif). Hasil penelitian menunjukkan bahwa amina reaktif merupakan ligan aditif yang baik untuk meningkatkan fluoresensi titik kuantum CdSe/ZnS yang terdispersi dalam resin silikon, dengan menghasilkan efisiensi luminans dan efisiensi konversi fotoluminesensi yang masing-masing 1,2–2,48 lm/W dan 4,2–5,56% lebih tinggi. Kami menduga bahwa amina reaktif ini mendonorkan elektron ke perangkap elektron permukaan, sehingga mengurangi rekombinasi muatan. Selain itu, titik kuantum beragregasi membentuk kluster titik kuantum yang terdispersi secara relatif homogen di dalam matriks resin silikon, menunjukkan sifat emisi yang baik akibat pasivasi permukaan dan stabilitas koloid yang baik dengan penambahan senyawa silazana ke dalam resin. Lebih lanjut, penambahan senyawa silazana ke dalam sistem titik kuantum-resin silikon juga menunjukkan peningkatan stabilitas termal dari nanokomposit yang disintesis.
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Authors Trung, Nguyen Ngoc;Luu, Quynh-Phuong;Son, Bui Thanh;Sinh, Le Hoang;Bae, Jin-Young;
Journal Journal of nanoscience and nanotechnology
Year 2013
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