Thermal Stability and Lasing of CdS Nanowires Coated by Amorphous Silica

Pan, Anlian; Wang, Yunlong; Liu, Ruibin; Li, Chaorong; Zou, B. S.

doi:10.1002/smll.200500169

Cited by 48 publications

(39 citation statements)

References 28 publications

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“…12),13) After being coated by a film of loose silica, the thermal stability of a single-crystalline CdS nanowire has been improved up to around 750°C. 16) By comparing the data in literature with the results of XRD and DSC-TG in the present research, we can conclud that the thermal stability of CdS particles has been further enhanced to more than 900°C by the hydrothermally densified SiO2-CeO2 matrix.…”

Section: Resultssupporting

confidence: 70%

“…4),12),13) Former researches showed that silica deposition on the surface of CdS quantum dots could improve its stability against photochemical degradation; 14),15) the thermal stability of CdS nanowires were enhanced by a coating of amorphous silica, 16) and it could be further increased to ~1200°C after been occluded in a densified zircon. 17) As shown in literature, a densified coating is preferred to enhance the oxidation resistance, which is generally sintered with the protection of N2 or Ar atmosphere.…”

Section: )8)mentioning

confidence: 99%

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Enhanced oxidation resistance of hydrothermally-encapsulated CdS nanoparticles in SiO2-CeO2 matrices

Zhang

Zeng

Rao

et al. 2008

J. Ceram. Soc. Japan

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This research aims to enhance the thermal stability of CdS nano-particles by a hydrothermally-formed glassy encapsulation structure of SiO2-CeO2. The crystalline phase, thermal effect and microstructure of the encapsulated CdS nanoparticles were investigated by the XRD, DSC-TG and TEM analysis. The results showed that most of the CdS nanoparticles had been encapsulated in the glassy phase of SiO2-CeO2 by a hydrothermal treatment at 200°C. This structure was stable up to more than 900°C, and it was destructed by the crystallization of crystalline CeO2 and SiO2 at a higher temperature. Protected by the glassy phase, the encapsulted CdS nanoparticles was thermally stable up to more than 900°C, which was gradually oxidized and sublimated at the temperature range of 1000-1200°C.

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Section: Resultssupporting

confidence: 70%

Section: )8)mentioning

confidence: 99%

Enhanced oxidation resistance of hydrothermally-encapsulated CdS nanoparticles in SiO2-CeO2 matrices

Zhang

Zeng

Rao

et al. 2008

J. Ceram. Soc. Japan

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“…Finally, for hybrid systems, there are two reports on nanocables of CdSe and CdS coated with dielectric materials such as SiO 2 [76,118]. The CdSe and CdS nanowires were coated with amorphous silica to prevent surface-state recombination and to protect the surface from oxidation and degradation.…”

Section: (B) Hybrid Systems and Heterostructuresmentioning

confidence: 99%

Nanowire Lasers

et al. 2015

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Abstract:We review principles and trends in the use of semiconductor nanowires as gain media for stimulated emission and lasing. Semiconductor nanowires have recently been widely studied for use in integrated optoelectronic devices, such as light-emitting diodes (LEDs), solar cells, and transistors. Intensive research has also been conducted in the use of nanowires for subwavelength laser systems that take advantage of their quasione-dimensional (1D) nature, flexibility in material choice and combination, and intrinsic optoelectronic properties. First, we provide an overview on using quasi-1D nanowire systems to realize subwavelength lasers with efficient, directional, and low-threshold emission. We then describe the state of the art for nanowire lasers in terms of materials, geometry, and wavelength tunability. Next, we present the basics of lasing in semiconductor nanowires, define the key parameters for stimulated emission, and introduce the properties of nanowires. We then review advanced nanowire laser designs from the literature. Finally, we present interesting perspectives for low-threshold nanoscale light sources and optical interconnects. We intend to illustrate the potential of nanolasers in many applications, such as nanophotonic devices that integrate electronics and photonics for next-generation optoelectronic devices. For instance, these building blocks for nanoscale photonics can be used for data storage and biomedical applications when coupled to on-chip characterization tools. These nanoscale monochromatic laser light sources promise breakthroughs in nanophotonics, as they can operate at room temperature, can potentially be electrically driven, and can yield a better understanding of intrinsic nanomaterial properties and surface-state effects in lowdimensional semiconductor systems.

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“…On the other hand, silicon dioxide (SiO 2 ) is known as one of the most suitable insulating material for nanowire passivation owing to its excellent insulating property, low dielectric constant, and high mechanical strength as well as compatibility with other materials widely used in integrated circuits (IC) fabrication. SiO 2 is also optically transparent for light absorption or emission of semiconductor nanowires, resulting in minimal destruction of their intrinsic optical properties such as photoluminescence [26,27]. In this paper, we report the fabrication of ZnS-core/SiO 2 -shell nanowires by using a two-step process: the thermal evaporation of ZnS powders and the sputter-deposition of SiO 2 .…”

Section: Introductionmentioning

confidence: 98%

Preparation, structure and photoluminescence properties of SiO₂–coated ZnS nanowires

Jin

Lee

Baek

et al. 2010

Cryst. Res. Technol.

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It is essential to passivate one-dimensional (1D) nanostructures with insulating materials to avoid crosstalking as well as to protect them from contamination and oxidation. The structure and influence of thermal annealing on the photoluminescence properties of ZnS-core/ SiO 2 -shell nanowires synthesized by the thermal evaporation of ZnS powders followed by the sputter deposition of SiO 2 were investigated. Transmission electron microscopy and X-ray diffraction analyses revealed that the cores and shells of the core-shell nanowires were single crystal zinc blende-type ZnO and amorphous SiO 2 , respectively. Photoluminescence (PL) measurement showed that the core-shell nanowires had a green emission band centered at around 525 nm with a shoulder at around 385 nm. The PL emission of the core-shell nanowires was enhanced in intensity by annealing in an oxidative atmosphere and further enhanced by subsequently annealing in a reducing atmosphere. Also the origin of the enhancement of the green emission by annealing is discussed based on the energy-dispersive X-ray spectroscopy analysis results.

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Thermal Stability and Lasing of CdS Nanowires Coated by Amorphous Silica

Cited by 48 publications

References 28 publications

Enhanced oxidation resistance of hydrothermally-encapsulated CdS nanoparticles in SiO2-CeO2 matrices

Enhanced oxidation resistance of hydrothermally-encapsulated CdS nanoparticles in SiO2-CeO2 matrices

Nanowire Lasers

Preparation, structure and photoluminescence properties of SiO₂–coated ZnS nanowires

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Thermal Stability and Lasing of CdS Nanowires Coated by Amorphous Silica

Cited by 48 publications

References 28 publications

Enhanced oxidation resistance of hydrothermally-encapsulated CdS nanoparticles in SiO2-CeO2 matrices

Enhanced oxidation resistance of hydrothermally-encapsulated CdS nanoparticles in SiO2-CeO2 matrices

Nanowire Lasers

Preparation, structure and photoluminescence properties of SiO2–coated ZnS nanowires

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Preparation, structure and photoluminescence properties of SiO₂–coated ZnS nanowires