Disabilities

Boettcher, Louise; Dammeyer, Jesper

doi:10.1093/obo/9780199756810-0090

Cited by 2 publications

(2 citation statements)

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“…We next tested the quenching behavior of benzyl viologen (BV) toward pSiNPs. BV is readily reduced at silicon electrodes, 46,47 and BV and AMC have similar reduction potentials (AMC = −350 mV vs NHE, BV = −359 mV vs NHE). 48,49 Thus, we assume that BV also undergoes an electron-transfer quenching pathway with pSiNPs.…”

Section: Preparation and Characterization Of Luminescent Porous Si Micro-and Nanoparticlesmentioning

confidence: 89%

Quantum Ensembles of Silicon Nanoparticles: Discrimination of Static and Dynamic Photoluminescence Quenching Processes

et al. 2019

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Porous silicon photoluminescence is characterized by a broad emission band that displays unusually long (tens to hundreds of micro-seconds), wavelength-dependent emissive lifetimes. The photoluminescence is associated with quantum confinement of excitons in silicon nanocrystallites contained within the porous matrix, and the broad emission spectrum derives from the wide distribution of nanocrystallite sizes in the material. The longer emissive lifetimes in the ensemble of quantum-confined emitters correspond to the larger nanocrystallites, with their longer wavelengths of emission. The quenching of this photoluminescence by aromatic, redox-active molecules aminochrome (AMC), dopamine, adrenochrome, sodium anthraquinone-2-sulfonate, benzyl viologen dichloride, methyl viologen dichloride hydrate, and ethyl viologen dibromide is studied, and dynamic and static quenching mechanisms are distinguished by the emission lifetime analysis. Because of the dependence of the emission lifetime on emission wavelength from the silicon nanocrystallite ensemble, a pronounced blue shift is observed in the steady-state emission spectrum upon exposure to dynamic-type quenchers. Conversely, static-type quenching systems show uniform quenching across all emission wavelengths. Thus, the difference between static and dynamic quenching mechanisms is readily distinguished by ratiometric photoluminescence spectroscopy. The application of this concept to imaging of AMC, the oxidized form of the neurotransmitter dopamine that is of interest for its role in neurodegenerative diseases, is *

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Section: Preparation and Characterization Of Luminescent Porous Si Micro-and Nanoparticlesmentioning

confidence: 89%

Quantum Ensembles of Silicon Nanoparticles: Discrimination of Static and Dynamic Photoluminescence Quenching Processes

et al. 2019

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“…1 Such high purities are not required for silicon nanowire or microwire arrays, as the photon absorption length and the charge collection distance can be decoupled; the minority charge carriers can travel radially to reach the surface while photons can be absorbed along the long axis of the nanowires or microwires. 2 While bulk measurements on many nanowires or microwires can provide important insights that relate the material geometry (e.g., spacing, diameter, length, and so forth) to its photovoltaic efficiency, [3][4][5] optical and electric characterization down to single nanostructures can elucidate the fundamental limits and potentials of using nanostructures in solar-driven applications. 6 For example, Lieber and coworkers used the metal-catalyzed vapor-liquid-solid method to synthesize p-type/intrinsic/n-type (p-i-n) coaxial silicon nanowires (SiNWs) and studied their photovoltaic characteristics and potential applications as the power source for nanoelectronics.…”

Section: Photovoltaic and Photoelectrochemical Processesmentioning

confidence: 99%

Learning from Solar Energy Conversion: Biointerfaces for Artificial Photosynthesis and Biological Modulation

Lee

Tian

2019

Nano Lett.

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Three seemingly distinct directions of nanomaterials research, photovoltaics, biofuel production, and biological modulation, have been sequentially developed over the past several decades. In this Mini Review, we discuss how the insights gleaned from nanomaterials-based solar energy conversion can be adapted to biointerface designs. Because of their size-and shape-dependent optical properties and excellent synthetic control, nanomaterials have shown unique technological advantages as the light absorbers or energy transducers. Biocompatible nanomaterials have also been incorporated into biological systems including biomolecules, bacteria, and eukaryotic cells for a large collection of fundamental studies and applications. For the photocatalytic biofuel production, either isolated bacterial enzymes or the entire bacteria have been hybridized with the nanomaterials, where functions from both parts are synergistically integrated. Likewise, interfacing nanomaterials with eukaryotic systems, whether in individual cells or tissues, has enabled optical modulation of cellular behavior and the construction of active cellular materials.Here we survey different approaches in which nanomaterials are used to elicit electrical or mechanical changes in single cells or cellular assemblies via photoelectrochemical or photothermal processes. We end this Mini Review with the discussion of future nongenetic modulation at the intracellular level.

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Disabilities

Cited by 2 publications

References 0 publications

Quantum Ensembles of Silicon Nanoparticles: Discrimination of Static and Dynamic Photoluminescence Quenching Processes

Quantum Ensembles of Silicon Nanoparticles: Discrimination of Static and Dynamic Photoluminescence Quenching Processes

Learning from Solar Energy Conversion: Biointerfaces for Artificial Photosynthesis and Biological Modulation

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