Colloidal Luminescent Silicon Nanorods

Lu, Xiufen; Hessel, Colin M.; Yu, Yixuan; Bogart, Timothy D.; Korgel, Brian A.

doi:10.1021/nl401802h

Cited by 58 publications

(83 citation statements)

References 60 publications

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“…2c), and the result suggests the presence of Si, C, and O. Highresolution XPS of the Si 2p region (inset) shows a characteristic peak for silicon atom at 99.3 eV; signals arising from Si surface atoms, as well as silicon suboxides, are observed at 100.3, 101.3, 102.3, and 103.4 eV, respectively. The XPS peak at 102.0 eV in the SiNRs resulted from Si-C bonding, is consistent with the FTIR results [35]. The typical N 2 adsorption-desorption isotherms are shown in Fig.…”

Section: Polymerizationsupporting

confidence: 88%

“…The excitation-dependent fluorescence emission of SiNRs is similar to those of previous reports [61] because of the varied sizes of Si nanoparticles in SiNRs. The fluorescence quantum yield of the SiNRs was calculated to be 3.3% using a spectrometer attached to an integrating sphere, which is relatively bright for SiNRs [35]. The stability of the obtained SiNRs under different pH conditions was further investigated.…”

Section: Photophysical and Photochemical Properties Of Sinrsmentioning

confidence: 99%

“…Compared with the attention devoted to 0D silicon na-noparticles, a considerable effort has been exerted on the controllable preparation of luminescent silicon nanorods (SiNRs) or nanowires due to their unique properties, such as better cell internalization capacity, higher drug loading efficency, ease of functionalization, and monitoring of cancer cell metastasis and drug/DNA delivery of 1D nanostructures [29][30][31][32][33]. For example, Korgel et al experimentally presented the first example of fluorescent SiNRs through a solution-liquid-solid growth method [34][35][36][37]. This approach, however, requires relatively complicated long-term synthetic procedures, a high temperature, and seed metals.…”

Section: Introductionmentioning

confidence: 99%

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Ethylene glycol-mediated synthetic route for production of luminescent silicon nanorod as photodynamic therapy agent

et al. 2017

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One-dimensional silicon nanorod (SiNR) has attracted considerable interest because of its unique morphology and electronic-optical properties that render SiNRs suitable for a broad spectrum of applications, such as fieldeffect transistor, drug carrier, solar cell, nanomechanical device, and lithium-ion battery. However, studies aiming to identify a new synthetic method and apply SiNR in the biomedical field remain limited. This study is the first to use an ethylene glycol-mediated synthetic route to prepare SiNR as a multicolor fluorescent probe and a new photodynamic therapy (PDT) agent. The as-prepared SiNR demonstrates bright fluorescence, excellent storage and photostability, favorable biocompatibility, excitation-dependent emission, and measurable quantity of 1 O 2 (0.24). On the basis of these features, we demonstrate through in vitro studies that the SiNR can be utilized as a new nanophotosensitizer for fluorescence imaging-guided cancer treatment. Our work leads to a new production process for SiNRs that can be used not only as PDT agents for therapy of shallow tissue cancer but also as excellent, environment-friendly, and red light-induced photocatalysts for the degradation of persistent organic pollutants in the future.

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Section: Polymerizationsupporting

confidence: 88%

Section: Photophysical and Photochemical Properties Of Sinrsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ethylene glycol-mediated synthetic route for production of luminescent silicon nanorod as photodynamic therapy agent

et al. 2017

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“…Generally, the absorbance and emission 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 spectra of these Si nanorods are similar to alkene-passivated Si nanocrystals [22][23][24][25] and Si nanorods made at higher temperature with trisilane and Sn seeds particles. 3 Figure 4d shows the timedependent PL decay. The time-dependent PL intensity (N(t)) data in Figure 5d fit well to a triple exponential: 26 1 with characteristic lifetime values of τ 1 = 30 ns, τ 2 = 700 ns and τ 3 = 8.5 μs.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5] This method requires a solvent, a silane reactant, and nanoparticles of a metal that forms a eutectic with Si, such as gold (Au) or tin (Sn).…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Colloidal Synthesis of Silicon Nanorods from Isotetrasilane, Neopentasilane, and Cyclohexasilane

Anderson

Boudjouk

et al. 2015

Chem. Mater.

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Isotetrasilane, neopentasilane and cyclohexasilane were studied as reactants for silicon (Si) nanorod growth in solution. These polysilane hydrides were found to enable lower growth temperatures in solution than any other silane reactants used to date. Cyclohexasilane enabled the lowest growth temperature of 200 o C, using a single-step solution-liquid-solid (SLS) reaction from tin (Sn) seeds. The potential for nanorod growth is determined by the reactivity of the silane. Cyclohexasilane is the most reactive of the polysilane hydrides studied here, requiring the lowest energy for dehydrogenation. The formation of silylene by cycolhexasilane also facilitates chemisorption onto the Sn surface during nanorod growth. Relatively bright photoluminescence (emission quantum yields of 2%) could still be achieved from Si nanorods grown at these low temperatures.

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Quaternized Silicon Nanoparticles with Polarity‐Sensitive Fluorescence for Selectively Imaging and Killing Gram‐Positive Bacteria

Zhang

Chen

Yang

et al. 2016

Adv Funct Materials

156

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With the emergence of antibiotic resistance, developing new antibiotics and therapies for combating bacterial infections is urgently needed. Herein, a series of quaternized fluorescent silicon nanoparticles (SiNPs) are facilely prepared by the covalent reaction between amine‐functionalized SiNPs and carboxyl‐containing N‐alkyl betaines. It is found that the bactericidal efficacy of these quaternized SiNPs increases with the length of the N‐alkyl chain, and SiNPs conjugated with N,N‐dimethyl‐N‐octadecylbetaine (BS‐18), abbreviated as SiNPs‐C18, show the best antibacterial effect, whose minimum inhibitory concentrations for Gram‐positive bacteria are 1–2 μg mL−1. In vivo tests further confirm that SiNPs‐C18 have excellent antibacterial efficacy and greatly reduce bacterial load in the infectious sites. The SiNPs‐C18 exhibit low cytotoxicity toward mammalian cells (including normal liver and lung cells, red blood cells, and macrophages), enabling them to be useful for clinical applications. Besides, the quaternized SiNPs exhibit polarity‐dependent fluorescence emission property and can selectively image Gram‐positive bacteria, thereby providing a simple method to successfully differentiate Gram‐positive and Gram‐negative bacteria. The present work represents the first example that successfully turns fluorescent SiNPs into metal‐free NP‐based antibiotics with simultaneous bacterial imaging and killing capability, which broadens the applications of fluorescent SiNPs and advances the development of novel antibacterial agents.

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Colloidal Luminescent Silicon Nanorods

Cited by 58 publications

References 60 publications

Ethylene glycol-mediated synthetic route for production of luminescent silicon nanorod as photodynamic therapy agent

Ethylene glycol-mediated synthetic route for production of luminescent silicon nanorod as photodynamic therapy agent

Low Temperature Colloidal Synthesis of Silicon Nanorods from Isotetrasilane, Neopentasilane, and Cyclohexasilane

Quaternized Silicon Nanoparticles with Polarity‐Sensitive Fluorescence for Selectively Imaging and Killing Gram‐Positive Bacteria

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