Yoo, Hyein Woo, Kyoungja 2024-01-19T23:02:34Z 2024-01-19T23:02:34Z 2021-09-03 2018-04 1948-7185 https://pubs.kist.re.kr/handle/201004/121522 We present a novel, direct approach to hybridize hydrophobic quantum dot (QD) nanocrystals with colloidal silica (A) via van der Waals (vdW) force only. The A is constructed by aggregation of 15-25 nm sized hydrophobic silica nanoparticles with octadecyl groups. For hybridization, the hydrophobic QDs sit on the crevices of A via reinforced vdW force by interdigitation of long-chained hydrocarbons along the enlarged contact area of the crevices. The hybrids (B) are easily encapsulated with silica with/without functional groups, yielding QD-layer-incorporated silica particles (C) with greatly enhanced PL (up to 690%) and astonishing photostability compared with their free QDs under an identical QD concentration. This approach is simple, novel, versatile, and extended to the cases of three different sized QDs. The hydrophobic product C with phenylethyl groups is applicable to fabricate a white LED, and its hydrophilic analogues can be a promising material for bioapplications. English American Chemical Society Direct Hybridization of Hydrophobic Nanocrystals with Colloidal Silica via van der Waals Force Article 10.1021/acs.jpclett.8b00695 1 The Journal of Physical Chemistry Letters, v.9, no.8, pp.2106 - 2112 The Journal of Physical Chemistry Letters 9 8 2106 2112 N scie scopus 000430894700047 2-s2.0-85045738417 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Atomic, Molecular & Chemical Chemistry Science & Technology - Other Topics Materials Science Physics Article LIGHT-EMITTING-DIODES QUANTUM-DOT-LAYER SEMICONDUCTOR NANOCRYSTALS HIGHLY LUMINESCENT WHITE LEDS SPHERES MICROSPHERES EFFICIENT NANOPARTICLES STABILITY hybridization nanocrystals silica hydrophobic quantum dots (QDs) enhanced photoluminescence