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Abstract
Traditional hot-injection (HI) syntheses of colloidal nanoparticles (NPs) allows good separation of the nucleation and growth stages of the reaction, a key limitation in obtaining monodisperse NPs, but with limited scalability. Here, two methods are presented for obtaining NPs via rapid heating: magnetic and microwave-assisted. Both of these techniques provide improved engineering control over the separation of nucleation and growth stages of nanomaterial synthesis when the reaction is initiated from room temperature. The advantages of these techniques with preliminary data are presented in this prospective article. It is shown here that microwave assisted heating could possibly provide some selectivity in activating the nanomaterial precursor materials, while magnetic heating can produce very tiny particles in a very short time (even on the millisecond timescale), which is important for scalability. The fast magnetic heating also allows for synthesizing larger particles with improved size distribution, therefore impacting, not only the quantity, but the quality of the nanomaterials.
Highlights
Colloidal semiconductor nanoparticles (NPs) or quantum dots (QDs) are an important class of materials to address questions in fundamental and practical science [1,2,3,4,5,6,7,8,9,10]
There is a strong impetus to scale up laboratory synthesis to industrial quantities
Traditional colloidal syntheses of QDs, such as the hot-injection (HI) method are not readily scalable [11]
Summary
The precursor molecules must decompose very rapidly rapidly to create the desirable high monomer supersaturation to separate nucleation and growth [17]. To create the desirable high monomer supersaturation to separate nucleation and growth Under these conditions, rapid heating techniques can become a viable alternative to the HI method. The temperature rise of the temperature rise of 300 C/s in the solution (steel balls + solvent + nanoparticle precursor), producing reactor is monitored by fiber optic temperature probe with an instrument response time about conditions similar to the HI method. Microwave heating can produce about estimated from the time it takes to get to the boiling point of the solvent That temperature rise which is proportional to the power absorbed the solution, is a equipment (microwave reactor, magnetically heated reactor, etc.).
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