Fluorescence detection system based on silicon quantum dots–polysilane nanocomposites

Săcărescu, Liviu; Roman, Gheorghe; Săcărescu, Gabriela; Simionescu, Mihaela

doi:10.3144/expresspolymlett.2016.92

Cited by 11 publications

(6 citation statements)

References 52 publications

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“…The reduction of SiCl 4 using sodium naphthalenide, sodium, lithium aluminum hydride, or tetraethylorthosilicate as a reducing agent quickly produces Si nanocrystals (Cheng et al, 2012;Choi et al, 2014;Sacarescu et al, 2016). As expected, however, the particle size distribution is very wide.…”

Section: Reduction Of Silicon Halidessupporting

confidence: 58%

“…The first include laser ablation (Li et al, 2004;Beard et al, 2007;Vendamani et al, 2015;Xin et al, 2017) and non-thermal plasma synthesis (Cheng et al, 2010;Yasar-Inceoglu et al, 2012;Liu et al, 2016). The second include electrochemical etching (Sato et al, 2009;Castaldo et al, 2014;Chen et al, 2019), reduction of silicon halides (Tilley and Yamamoto, 2006;Cheng et al, 2012;Choi et al, 2014;Sacarescu et al, 2016), thermal destruction of silicon-rich oxides (Hessel et al, 2007(Hessel et al, , 2011, hydrothermal decomposition of different Si-contained organic precursors (Lopez-Delgado et al, 2017;Liu et al, 2018b;Phan et al, 2018;Yi et al, 2019), oxidation of sodium silicide or Zintl monoclinic phase (Na 4 Si 4 ) (Neiner et al, 2006;Atkins et al, 2011;Beekman et al, 2019), mechanochemistry (Chaudhary et al, 2014), processing porous silicon , and others (Holmes et al, 2001;Dasog et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes

et al. 2020

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Silicon quantum dots (SiQDs) are semiconductor Si nanoparticles ranging from 1 to 10 nm that hold great applicative potential as optoelectronic devices and fluorescent bio-marking agents due to their ability to fluoresce blue and red light. Their biocompatibility compared to conventional toxic Group II-VI and III-V metal-based quantum dots makes their practical utilization even more attractive to prevent environmental pollution and harm to living organisms. This work focuses on their possible use for light-emitting diode (LED) manufacturing. Summarizing the main achievements over the past few years concerning different Si quantum dot synthetic methods, LED formation and characteristics, and strategies for their stabilization by microencapsulation and modification of their surface by specific ligands, this work aims to provide guidance en route to the development of the first stable Si-based light-emitting diodes.

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Section: Reduction Of Silicon Halidessupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes

et al. 2020

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“…An assembly of organosilanes on porous silicon using visible light is reported by Rodriguez et al [6]. The functionalization of semiconductor nanostructures with organic monolayers is regarded as essential for tailoring the surface chemistry for bioconjugation [7]. Porous silicon is often a matrix of silicon quantum dots immersed into amorphous network containing silica and silicon.…”

Section: This Special Issuementioning

confidence: 99%

Surface Modification to Improve Properties of Materials

Mozetič

2019

Materials

167

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Surface properties of modern materials are usually inadequate in terms of wettability, adhesion properties, biocompatibility etc., so they should be modified prior to application or any further processing such as coating with functional materials. Both the morphological properties and chemical structure/composition should be modified in order to obtain a desired surface finish. Various treatment procedures have been employed, and many are based on the application of non-equilibrium gaseous media, especially gaseous plasma. Although such treatments have been studied extensively in past decades and actually commercialized, the exact mechanisms of interaction between reactive gaseous species and solid materials is still inadequately understood. This special issue provides recent trends in nanostructuring and functionalization of solid materials with the goal of improving their functional properties.

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“…The functionalization of semiconductor nanostructures with organic monolayers is a requirement for tailoring their surface chemistry for ulterior bioconjugation [1,2]. Porous Silicon (PSi) can be described as a matrix of silicon quantum dots (Si QDs) immersed in an amorphous Si/silica network.…”

Section: Introductionmentioning

confidence: 99%

Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles

et al. 2019

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Porous silicon (PSi) is a versatile matrix with tailorable surface reactivity, which allows the processing of a range of multifunctional films and particles. The biomedical applications of PSi often require a surface capping with organic functionalities. This work shows that visible light can be used to catalyze the assembly of organosilanes on the PSi, as demonstrated with two organosilanes: aminopropyl-triethoxy-silane and perfluorodecyl-triethoxy-silane. We studied the process related to PSi films (PSiFs), which were characterized by X-ray photoelectron spectroscopy (XPS), time of flight secondary ion mass spectroscopy (ToF-SIMS) and field emission scanning electron microscopy (FESEM) before and after a plasma patterning process. The analyses confirmed the surface oxidation and the anchorage of the organosilane backbone. We further highlighted the surface analytical potential of 13C, 19F and 29Si solid-state NMR (SS-NMR) as compared to Fourier transformed infrared spectroscopy (FTIR) in the characterization of functionalized PSi particles (PSiPs). The reduced invasiveness of the organosilanization regarding the PSiPs morphology was confirmed using transmission electron microscopy (TEM) and FESEM. Relevantly, the results obtained on PSiPs complemented those obtained on PSiFs. SS-NMR suggests a number of siloxane bonds between the organosilane and the PSiPs, which does not reach levels of maximum heterogeneous condensation, while ToF-SIMS suggested a certain degree of organosilane polymerization. Additionally, differences among the carbons in the organic (non-hydrolyzable) functionalizing groups are identified, especially in the case of the perfluorodecyl group. The spectroscopic characterization was used to propose a mechanism for the visible light activation of the organosilane assembly, which is based on the initial photoactivated oxidation of the PSi matrix.

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Fluorescence detection system based on silicon quantum dots–polysilane nanocomposites

Cited by 11 publications

References 52 publications

Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes

Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes

Surface Modification to Improve Properties of Materials

Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles

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