Photoactivated CdSe Nanocrystals as Nanosensors for Gases

Nazzal, Amjad; Qu, Lianhua; Peng, Xiaogang; Xiao, Min

doi:10.1021/nl0340935

Cited by 252 publications

(212 citation statements)

References 18 publications

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“…CdSe is one of such materials, shows strong fluorescence which can be tuned according to the particle size. CdSe has been considered in many applications such as optoelectronic devices (Nazzal et al 2003), light sensors (Bruchez et al 1998), biological labels (Colvin et al 1994), chemical libraries (Gaponik et al 2002), etc. The nanopowder of CdSe provides excellent and unique properties which depend upon the shape and size of the nanostructures (Haram et al 2001;Wang et al 2004;Datta and Das 1990;Peng et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Cadmium Selenide (CdSe) Nanoparticles synthesized by solvothermal method

2013

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Synthesis of nanoparticles of cadmium selenide (CdSe) was carried out using solvothermal method with cadmium nitrate and sodium selenite as precursors. Hydrazine hydrate and ethylenediamine tetra acetic acid were used as the capping agent to control the size of the nanoparticles. As their size decreases to their Bohr radius (usually around a few nanometers), all electronic properties change, and equally important, become dependent on size. In this size, a semiconductor nanoparticle transition occurs in which the electrons and holes are confined beyond their natural Bohr radius. The properties become dependent not only on size, but also on shape. The crystalline nature and particle size of the samples were characterized by Powder X-ray diffraction analysis (XRD). The morphology of prepared CdSe nanoparticles was studied by scanning electron microscope. Dielectric studies were carried out for the pelletized sample of CdSe nanoparticles. The ac conductivity of CdSe nanoparticle has been studied. The obtained results are discussed.

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Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Cadmium Selenide (CdSe) Nanoparticles synthesized by solvothermal method

2013

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“…The suited PL properties include broad absorption band, size tuneable spectral emission, higher photostability, and emission lifetime ranging between several hundreds of picosecond and tens of nanosecond [6]. In the last ten years, authors reported the sensitivity of colloidal QDs embedded into polymeric matrix [7][8][9][10][11], sol-gel materials [12,13] or dispersed in Al 2 O 3 nanopore array [13]. Per se they display sensitivity towards some commonly used solvents like methanol, ethanol, acetone and chloroform [12].…”

Section: Introductionmentioning

confidence: 99%

Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots

Angelis¹,

Casalboni²,

Colantoni³

et al. 2013

JST

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Surface InP quantum dots grown by gas source molecular beam epitaxy on In 0.48 Ga 0.52 P buffer layer lattice matched to GaAs substrate shows a broad-band near-infrared photoluminescence ranging from 750 to 865 nm dependent on their dimensions. A reversible luminescence intensity enhancement has been observed when the quantum dots were exposed to vapours of different chemical solvents with the highest sensitivity for alcohol (methanol and ethanol) vapours. The luminescent behaviour is dependent on the solvent type and concentration. The peak energy and band shape of the luminescence are not affected by the solvent vapour.

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“…Compared with the traditional organic dyes, QDs have excellent optical properties: a wider absorption band and a narrower emission band of mostly symmetric shape [53]. In 2003, Peng's research group [54] proposed that semiconductor NCs can be used as the gas sensing material, because gas can cause a weak change of chemical or physical properties on NCs surface, and it thus changes the optical properties. CdSe NCs incorporated into polymer thin films was found a better response for amines.…”

Section: Sensorsmentioning

confidence: 99%

Exploration of nano-surface chemistry for spectral analysis

Liu

Lü

et al. 2013

Chin. Sci. Bull.

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The applications of nano-surface chemistry in the field of spectral analysis have attracted growing interest in recent years. In this article, we reviewed the applications of nanomaterials-based chemical reactions for spectral analysis, including the development in plasma-catalysis, surface-enhanced spectroscopy, separation and preconcentration, chemical vapor generation, labeling and signal amplification. Introduction of nano-surface chemistry to spectral analysis not only improves the sensitivity and selectivity, broadens the application range of spectral analysis, but also affords analytical community special characterization tools.surface chemistry, nanomaterial, plasma, separation, chemical vapor generation, opticle gas sensors, atomic spectrometry Citation:Li C H, Liu R, Lü Y, et al. Exploration of nano-surface chemistry for spectral analysis.

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Photoactivated CdSe Nanocrystals as Nanosensors for Gases

Cited by 252 publications

References 18 publications

Dielectric Properties of Cadmium Selenide (CdSe) Nanoparticles synthesized by solvothermal method

Dielectric Properties of Cadmium Selenide (CdSe) Nanoparticles synthesized by solvothermal method

Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots

Exploration of nano-surface chemistry for spectral analysis

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