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Nanoarchitectonics of Photoluminescent InP/ZnS Quantum Dots Encapsulated Silica Capsules in Physiological Solutions

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Optical properties and morphology of silica nanocapsules (ca. 40 nm of size) incorporated with multiple InP/ZnS quantum dots (QDs, ca. 3.5 nm of size) have been investigated systematically in a typical cell culture medium (Dulbecco Modified Eagle Medium, DMEM buffer) over a period of time. The stability of silica nanocapsules with multiple QDs are found to be more robust, compared to the original aqueous pristine QDs over a period of 6 h. However, their photoluminescence efficiency is decreased after 8 h, accompanied by a change in morphology of the silica capsules. This change in morphology is caused by the dissolution of silica by alkali, and alkali-earth cations in the buffer. Our results confirm that the silica nanocapsule surface modification occurs in aqueous solution, resulting in a change from hydroxyl to carboxyl group. We also discuss possible methods to further increase the stability of the silica nanocapsules in physiological solutions.
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Keywords: Degradation; InP; Photoluminescence; Physiological Solution; Quantum Dot

Document Type: Research Article

Affiliations: 1: Tianjin Key Laboratory of Optoelectronic Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Xiqing, Tianjin, 300384, P. R. China 2: Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan 3: College of Chemistry and Chemical Engineering, Tianjin University of Technology, Xiqing, Tianjin, 300384, P. R. China

Publication date: May 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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