Synthesis and Application of Silica-Coated Quantum Dots in Biomedicine

Pham, Xuan‐Hung; Park, Seung Min; Ham, Kyeong-Min; Kyeong, San; Son, Byung Sung; Kim, Jaehi; Hahm, Eunil; Kim, Chongam; Bock, Sungje; Kim, Woo-Yeon; Jung, Seunho; Oh, Sangtaek; Lee, Sang Hun; Hwang, Do Won; Jun, Bong‐Hyun

doi:10.3390/ijms221810116

Cited by 27 publications

(20 citation statements)

References 81 publications

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“…Due to the native oleic acid ligands, the SPs are not soluble in water and quickly precipitate. To allow for water solubility, a thin (<5 nm) silica shell is grown on the surface of the spheres using the Stöber method, shown schematically in Figure c. − This consists of a two-step process: first the native oleic acid ligands are exchanged to polyvinylpyrrolidone (PVP), followed by the deposition of silica in the presence of ammonia. Two silica precursors were used: tetraethylorthosilicate (TEOS) and 3-aminopropyltrimethoxysilane (APTMS).…”

Section: Resultsmentioning

confidence: 99%

Biotinylated Photocleavable Semiconductor Colloidal Quantum Dot Supraparticle Microlaser

Eling,

Bruce,

Gunasekar

et al. 2024

ACS Appl. Nano Mater.

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Luminescent supraparticles of colloidal semiconductor nanocrystals can act as microscopic lasers and are hugely attractive for biosensing, imaging, and drug delivery. However, biointerfacing these to increase functionality while retaining their main optical properties remains an unresolved challenge. Here, we propose and demonstrate red-emitting, silica-coated CdS x Se1−x /ZnS colloidal quantum dot supraparticles functionalized with a biotinylated photocleavable ligand. The success of each step of the synthesis is confirmed by scanning electron microscopy, energy dispersive X-ray and Fourier transform infrared spectroscopy, ζ-potential, and optical pumping measurements. The capture and release functionality of the supraparticle system is proven by binding to a neutravidin functionalized glass slide and subsequently cleaving off after UV-A irradiation. The biotinylated supraparticles still function as microlasers; e.g., a 9 μm diameter supraparticle has oscillating modes around 625 nm at a threshold of 58 mJ/cm2. This work is a first step toward using supraparticle lasers as enhanced labels for bionano applications.

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Section: Resultsmentioning

confidence: 99%

Biotinylated Photocleavable Semiconductor Colloidal Quantum Dot Supraparticle Microlaser

Eling,

Bruce,

Gunasekar

et al. 2024

ACS Appl. Nano Mater.

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“…Besides the above two QDFHs, SiQDs have fluorescence properties similar to those of CDs as well as low toxicity and good biocompatibility [182,183] . Based on the same fluorescence suppression mechanism, QDFHs containing SiQDs have been used to detect metal ions (such as Cr 6+ , Fe 3+ , or Cu 2+ ) [184,185] .…”

Section: Other Qdsmentioning

confidence: 99%

Application of optical hydrogels in environmental sensing

Yang

Sarkar

Xie

et al. 2023

Preprint

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The ever-increasing complexity of environmental pollutants urgently warrants the development of new detection technologies. In this context, sensors based on the optical properties of hydrogels enabling fast and easy in situ detection are attracting increasing attention. Herein, the target recognition and sensing mechanisms of two main types of optical hydrogels (OHs) are reviewed and discussed: photonic crystal hydrogels (PCHs) and fluorescent hydrogels (FHs). For PCHs, the environmental stimulus response, target receptors, inverse opal structures, and molecular imprinting techniques related to PCHs are reviewed and summarized. Furthermore, the different types of fluorophores (i.e., compound probes, biomacromolecules, quantum dots, and luminescent microbes) of FHs are summarized. Finally, the data from 138 papers about different OHs are extracted for secondary statistical analysis. The detection performance and potential of various OH types in different environmental pollutant detection scenarios are evaluated, and compared them to those obtained using the standard detection method. Based on this analysis, some possible development directions are proposed, including the fusion of various OHs, introduction of more hydrogel technologies from the biomedical field to the environmental pollutant detection field, and development of multifunctional sensor arrays.

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“…However, adsorption process found particular interest because of its high efficiency and economic consideration [14,[17][18][19]. Many types of adsorbents such as carbon materials, clay material, biomaterials, nanoparticles, nanocomposites, leaves and fly ash have been extensively used for the removal of dye from aqueous solution [20][21][22]. Double hydroxide (LDH) [23], Rutile TiO2 [24], layered graphene and acid-modified graphene [25], and maize stem tissue [26] were used to extract EBT.…”

Section: Introductionmentioning

confidence: 99%

The uptake of Eriochrome Black T dye from Wastewater utilizing synthetized Cadmium Sulfide Nanoparticles

MAHMOOD

2021

Egypt. J. Chem.

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Eriochrome Black T dye is an indicator of complex titration as water hardness, as an azo dye, blue in its deprotonated form, and turns red when it forms a complex with metal ions such as Ca, Mg, Cd . .etc. Water contamination is considered one of the most important problems that threaten human life on earth. An efficient method is done to remove EBT from wastewater via using cadmium sulfide Nanoparticles (CdS NPS) that was prepared by using an inexpensive and simple method (chemical precipitation) and was diagnosed this nanomaterial using an X-ray diffractometer (XRD), Transmission electron microscope (TEM), Scanning electron microscope (SEM) and Energy Dispersive X-Ray Analyzer (EDX). TEM characterization results for CdS nanoparticles illustrated that the nanoparticles have a pointy shape-like needles morphology and with miscellaneous sizes, the statistical calculation gives (32) nm as the rate particle size. Through this study, the CdS nanomaterial proved that it has a high ability to adsorb Eriochrome Black-T (EBT) dye under certain conditions where we noticed that the maximum adsorption capacity of this dye by CdS nanoparticles was at Temperature (293) K, (pH = 6) and at a concentration (0.01 g) of the CdS nanomaterial with contact time up to (40) minutes and CdS. Also calculated the thermodynamic functions, (ΔS, ΔH, ΔG), we found that the process was spontaneous and exothermic under the specific condition through The thermodynamic parameters.

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Synthesis and Application of Silica-Coated Quantum Dots in Biomedicine

Cited by 27 publications

References 81 publications

Biotinylated Photocleavable Semiconductor Colloidal Quantum Dot Supraparticle Microlaser

Biotinylated Photocleavable Semiconductor Colloidal Quantum Dot Supraparticle Microlaser

Application of optical hydrogels in environmental sensing

The uptake of Eriochrome Black T dye from Wastewater utilizing synthetized Cadmium Sulfide Nanoparticles

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