Highly monodisperse polymer-capped ZnO nanoparticles: Preparation and optical properties

Guo, Lin; Yang, Shihe; Yang, Chunlei; Yu, Ping; Wang, Jiannong; Ge, Weikun; Wong, George K.

doi:10.1063/1.126511

Cited by 483 publications

(274 citation statements)

References 28 publications

Supporting

Mentioning

251

Contrasting

Unclassified

Order By: Relevance

“…20 The particle diameter d is calculated using the Debye-Scherer formula d = 0.89 / ͑␤ cos ͒ where is the x-ray wavelength ͑1.5406 Å͒, is the Bragg diifraction angle, and ␤ is the peak width at half maximum. 21 The XRD peak at 36°in Fig. 3 gives the ZnO particle diameter of 18 nm and matches well with the size calculated from absorption spectrum.…”

Section: Methodssupporting

confidence: 54%

“…Researches indicate that the surface passivation via surfactant and polymer capping is an effective method to enhance the UV emission and quench the defect-related visible PL from nanosized ZnO. 21,24 The effect of method of preparation and surface passivation itself is an indication that the green emission is due to surface states. 12 For the uncapped ZnO nanoparticles, there exist abundant surface defects, the valence band hole can be trapped by the surface defects and then tunnels back into oxygen vacancies containing one electron to form V O ** recombination center.…”

Section: -4mentioning

confidence: 99%

See 1 more Smart Citation

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Irimpan

Nampoori

Radhakrishnan

et al. 2007

Journal of Applied Physics

178

View full text Add to dashboard Cite

Intra-excitonic relaxation dynamics in ZnO Appl. Phys. Lett. 99, 231910 (2011) Thermal diffusion of nitrogen into ZnO film deposited on InN/sapphire substrate by metal organic chemical vapor deposition J. Appl. Phys. 110, 113509 (2011) Manifestation of spin-spin interaction between oxygen vacancy and magnesium in ZnMgO nanorods by electron paramagnetic resonance studies Appl. Phys. Lett. 99, 194101 (2011) Selective pair luminescence in the 1.4-eV band of CdTe:In J. Appl. Phys. 110, 093103 (2011) Evidence of cation vacancy induced room temperature ferromagnetism in Li-N codoped ZnO thin films Appl. Phys. Lett. 99, 182503 (2011) Additional information on J. Appl. Phys. In this article we present size dependent spectroscopic observations of nanocolloids of ZnO. ZnO is reported to show two emission bands, an ultraviolet ͑UV͒ emission band and another in the green region. Apart from the known band gap 380 nm and impurity 530 nm emissions, we have found some peculiar features in the fluorescence spectra that are consistent with the nanoparticle size distribution. Results show that additional emissions at 420 and 490 nm are developed with particle size. The origin of the visible band emission is discussed. The mechanism of the luminescence suggests that UV luminescence of ZnO colloid is related to the transition from conduction band edge to valence band, and visible luminescence is caused by the transition from deep donor level to valence band due to oxygen vacancies and by the transition from conduction band to deep acceptor level due to impurities and defect states. A correlation analysis between the particle size and spectroscopic observations is also discussed.

show abstract

Section: Methodssupporting

confidence: 54%

Section: -4mentioning

confidence: 99%

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Irimpan

Nampoori

Radhakrishnan

et al. 2007

Journal of Applied Physics

178

View full text Add to dashboard Cite

show abstract

“…Nanoparticles can also be directly synthesized in the presence of such polymers (Kairdolf et al 2008b), or other weakly adsorbing species like poly(vinyl pyrilidone) (Guo et al 2000). Furthermore, the particle modification by adsorption of polyelectrolytes has been reported, either as additional layer (Sukhanova et al 2004) or replacing the original surfactant Lin et al 2008b) of different core materials.…”

Section: (D) Polymer Coatingsmentioning

confidence: 99%

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Sperling

Parak

2010

Phil. Trans. R. Soc. A.

1,396

1,092

View full text Add to dashboard Cite

Inorganic colloidal nanoparticles are very small, nanoscale objects with inorganic cores that are dispersed in a solvent. Depending on the material they consist of, nanoparticles can possess a number of different properties such as high electron density and strong optical absorption (e.g. metal particles, in particular Au), photoluminescence in the form of fluorescence (semiconductor quantum dots, e.g. CdSe or CdTe) or phosphorescence (doped oxide materials, e.g. Y 2 O 3 ), or magnetic moment (e.g. iron oxide or cobalt nanoparticles). Prerequisite for every possible application is the proper surface functionalization of such nanoparticles, which determines their interaction with the environment. These interactions ultimately affect the colloidal stability of the particles, and may yield to a controlled assembly or to the delivery of nanoparticles to a target, e.g. by appropriate functional molecules on the particle surface. This work aims to review different strategies of surface modification and functionalization of inorganic colloidal nanoparticles with a special focus on the material systems gold and semiconductor nanoparticles, such as CdSe/ZnS. However, the discussed strategies are often of general nature and apply in the same way to nanoparticles of other materials.

show abstract

“…As the width increases, the particle size decreases and vice versa [32]. The average crystal size is calculated from Scherrer formula [33]. The average crystal size of the samples lies in the order of 6.2 ± 2.1 nm.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

One-pot sonochemical synthesis of CdS nanoparticles: photocatalytic and electrical properties

et al. 2015

View full text Add to dashboard Cite

CdS nanoparticles (NPs) are synthesized by sonochemical method using tryptophan as a capping agent. The synthesis process is of one step, using biocompatible capping agent, which is nontoxic. The synthesized NPs are characterized by UV-Vis absorption, fluorescence, FTIR, XRD, TGA, DLS, SEM and TEM. The size of NPs is below 10 nm, as observed from XRD and TEM characterizations. Photocatalytic degradation of methyl orange (MO) dye by the CdS NPs as photocatalysts under sunlight irradiation has been studied. The kinetics of catalysis of synthesized CdS NPs with MO dye follows pseudo-firstorder kinetics with reasonable apparent rate constants. A variation of dielectric constant as a function of frequencies of an alternating electric field has been observed with the prepared tryptophan-capped CdS NPs deposited at different concentrations. The electric conductivity of CdS NPs is found to increases with the concentration of tryptophan.

show abstract

Highly monodisperse polymer-capped ZnO nanoparticles: Preparation and optical properties

Cited by 483 publications

References 28 publications

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

One-pot sonochemical synthesis of CdS nanoparticles: photocatalytic and electrical properties

Contact Info

Product

Resources

About