Critical assessment of wet-chemical oxidation synthesis of silicon quantum dots

Wilbrink, Jonathan Lammert-Jan; Huang, Chih-Fang; Dohnalová, Kateřina

doi:10.1039/c9fd00099b

Cited by 21 publications

(11 citation statements)

References 118 publications

(122 reference statements)

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“… 7 , 19 − 22 Such SiNPs are typically synthesized by wet-chemical methods that involve higher temperatures in the presence of carbon sources during the synthesis process that has been recently reported to lead to the cosynthesis of various carbon-related fluorescent material, such as carbon dots 23 − 25 along with the SiNPs in the sample. Recent critical reports have also shown that even without Si precursors, the product still has optical properties similar to those reported for SiNPs, 26 − 28 which strengthens the argument of contamination by brightly fluorescent carbon species causing the reported bright PL, instead of silicon.…”

Section: Introductionsupporting

confidence: 71%

Microscopic Proof of Photoluminescence from Mechanochemically Synthesized 1-Octene-Capped Quantum-Confined Silicon Nanoparticles: Implications for Light-Emission Applications

et al. 2022

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Silicon nanoparticles (SiNPs) have been explored intensively for their use in applications requiring efficient fluorescence for LEDs, lasers, displays, photovoltaic spectral-shifting filters, and biomedical applications. High radiative rates are essential for such applications, and theoretically these could be achieved via quantum confinement and/or straining. Wet-chemical methods used to synthesize SiNPs are under scrutiny because of reported contamination by fluorescent carbon species. To develop a cleaner method, we utilize a specially designed attritor type high-energy ball-mill and use a high-purity (99.999%) Si microparticle precursor. The mechanochemical process is used under a continuous nitrogen gas atmosphere to avoid oxidation of the particles. We confirm the presence of quantum-confined NPs (<5 nm) using atomic force microscopy (AFM). Microphotoluminescence (PL) spectroscopy coupled to AFM confirms quantum-confined tunable red/near-infrared PL emission in SiNPs capped with an organic ligand (1-octene). Using micro-Raman-PL spectroscopy, we confirm SiNPs as the origin of the emission. These results demonstrate a facile and potentially scalable mechanochemical method of synthesis for contamination-free SiNPs.

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Section: Introductionsupporting

confidence: 71%

Microscopic Proof of Photoluminescence from Mechanochemically Synthesized 1-Octene-Capped Quantum-Confined Silicon Nanoparticles: Implications for Light-Emission Applications

et al. 2022

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“…as precursors is another solution-based method. 67,68 For instance, Fe-doped Si NPs were constructed by the reaction of Na 4 Si 4 with x% Fe (x = 1, 5, 10) and NH 4 Br. 57 The reduction of silicon alkoxide [such as triethoxysilane and (3-aminopropyl) triethoxysilane] is a simple and moderate strategy for watersoluble Si QDs that has been widely reported in recent years.…”

Section: ■ Synthesis Of Si Qdsmentioning

confidence: 99%

Recent Updates on Functionalized Silicon Quantum-Dot-Based Nanoagents for Biomedical Applications

Yang

Cui

Wen

et al. 2023

ACS Materials Lett.

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Silicon nanomaterials are one of the most representative inorganic nanomedicines in therapeutic biomedicine. Silicon quantum dots (Si QDs) have aroused wide attention in the biomedical field owing to their abundant natural reserves, favorable biocompatibility, and attractive optical properties. In recent years, extensive efforts have been devoted to exploring efficient strategies for the synthesis of Si QDs suitable for versatile biomedical applications. Herein, this Review focuses on the recent exciting advances in how Si QDs can be designed into promising biomedical materials. Rational design of the fabrication methods and modifications of Si QDs is discussed, which provides a generic idea for the biomedical exploration of modified Si QDs. In addition, up-to-date research hotspots of Si QD applications in the biomedical field are also summarized, including disease diagnosis/therapeutics, bioanalyte sensing, and tissue engineering. This Review aims to provide material researchers with deep insights into the design of novel Si QDs for biomedical applications.

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“…[44] Wet chemical techniques or chemical oxidation usually used semiconductor as a doping, such as Si/Ge QD. [45] , or H 2 SO 4 or mixed oxidative with HNO 3 can also be used. This technique was used to produce various ROS or oxygen atoms in the form of ÀCOOH and ÀOH.…”

Section: Synthesized Cdsmentioning

confidence: 99%

High reactive oxygen species produced from fluorescence carbon dots for anticancer and photodynamic therapies: A review

et al. 2022

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High‐photoluminescence carbon dots (CDs) were synthesized from various sources and various methods using two approaches, namely bottom up and top down, with emission‐dependent excitation wavelength. Electronic transition from the higher‐occupied molecular orbital (HOMO) state to the lowest‐unoccupied molecular orbital(LUMO) state, surface defect states, wider excitation spectrum, higher quantum yield, efficient energy transfer, and element doping affected the fluorescence properties of CDs. Using 102 references listed in this review, the authors studied the relationship between fluorescence mechanism and reactive oxygen species (ROS) produced for photodynamic therapy (PDT) and materials anticancer applications. We described how the radical atom or ROS work as anticancer therapy and PDT and described the chemical reaction of high‐resolution fluorescence CDs. We summarized experimental techniques that are used for producing CDs and discussed their characteristics. Finally, conclusions and future prospects in this field are also discussed. The important characteristics of CD‐based design for high ROS may usher in new prospects and challenges for high efficiency and stability of PDT and anticancer therapy. In conclusion, we have provided perspectives and challenges of the future development of CD s.

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Critical assessment of wet-chemical oxidation synthesis of silicon quantum dots

Abstract: The wet-chemical Si QD synthesis by oxidation of magnesium silicide (Mg2Si) with bromine (Br2) was revisited.

Cited by 21 publications

References 118 publications

Microscopic Proof of Photoluminescence from Mechanochemically Synthesized 1-Octene-Capped Quantum-Confined Silicon Nanoparticles: Implications for Light-Emission Applications

Microscopic Proof of Photoluminescence from Mechanochemically Synthesized 1-Octene-Capped Quantum-Confined Silicon Nanoparticles: Implications for Light-Emission Applications

Recent Updates on Functionalized Silicon Quantum-Dot-Based Nanoagents for Biomedical Applications

High reactive oxygen species produced from fluorescence carbon dots for anticancer and photodynamic therapies: A review

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