Semiconductor Nanoparticles

Bangal, M.; Ashtaputre, Shriwas; Marathe, Sonali; Ethiraj, Anita Sagadevan; Hebalkar, Neha; Gosavi, Suresh; Urban, Joachim; Kulkarni, Sulabha K.

doi:10.1007/s10751-005-9151-y

Cited by 32 publications

(15 citation statements)

References 31 publications

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“…Among nanomaterials, the semiconductor nanoparticles (NPs) have attracted a great deal of attention due to their size dependent intense optical properties [4,5]. The quantum confinement phenomenon has been utilized to tune the optical properties of quantum dots (QDs).…”

Section: Introductionmentioning

confidence: 99%

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Kumar

Biradar

2011

Phys. Rev. E

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We present here the dielectric and electro-optical studies of cadmium telluride quantum dots (CdTe QDs) doped ferroelectric liquid crystals (FLCs). It has been observed that the doping of CdTe QDs not only induced a pronounced memory effect but also affected the physical parameters of FLC material (LAHS19). The modifications in the physical parameters and memory effect of LAHS19 are found to depend on the concentration ratio of CdTe QDs. The lower concentration of CdTe QDs (1-3 wt%) enhanced the values of spontaneous polarization and rotational viscosity of LAHS19 material but did not favor the memory effect, whereas a higher concentration of CdTe QDs (>5 wt%) degraded the alignment of LAHS19 material. The doping of ∼5 wt% of CdTe QDs is found to be the most suitable for achieving good memory effect without significantly affecting the material parameters.

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Section: Introductionmentioning

confidence: 99%

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Kumar

Biradar

2011

Phys. Rev. E

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“…The FTIR spectrum is given in figures 1 and figure 2. UV Spectrometric analysis showed that as particle size is reduced below the Bohr size of exciton, the energy gap increases and can be observed as shift in the absorption edge (Bangal and Ashtaputre, 2005). Band gaps for Zinc Sulfide (with and without CTAB) were 5.48 eV and 5.99 eV, respectively which was much increased from band gap for bulk ZnS (3.68 eV).…”

Section: Resultsmentioning

confidence: 97%

Novel method to synthesize and characterize Zinc Sulfide nanoparticles

Thangam¹,

Anitha²,

Kavitha³

2012

IJASER

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Zinc sulfide nanoparticles were fabricated by solvent evaporation method with and without using capping agent, Hexa decyltrimethyl ammonium bromide (CTAB) at room temperature. The product was received in powder form. The structure and composition of the resultant product was characterized by means of UV and FTIR spectrophotometric studies. FTIR analysis showed peaks at 352.02 cm-1 and 611.46 cm-1 for Zinc Sulfide with CTAB, corresponding to Zinc and Sulfide stretching. For Zinc Sulfide without CTAB, the same stretching frequencies were observed at 315.10 cm-1 and 615.32 cm-1. UV spectrophotometer study determined the band gap of nanocrystalline Zinc Sulfide (with and without CTAB) as 5.48 eV and 5.99 eV, respectively. The optical absorption edge exhibited a blue shift with respect to that of the bulk sample. The blue shift with the decrease in crystalline size was attributed to the quantum size effects. When ZnS was prepared without CTAB, there was decrease in the size of the nanoparticle than when it was prepared with CTAB. Even though no capping agent (CTAB) was used in preparing ZnS, the particle size was well reduced. It was achieved by stirring the solutions during preparation. No agglomeration of nanoparticles was detected

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“…Transmission electron microscopy (TEM, model: LEO 912AB-Germany) and scanning electron microscopy (SEM, model: LEO 1450VP-Germany) were used to www.pss-c.com physica p s s status solidi c determine the particle size and morphology of nanopowders. Optical characterizations were carried out by Fourier transform infra red spectroscopy from reflectance spectra of powders in KBr matrix in the region (400-4000 cm −1 ) and also by UV absorbance spectra from nanopowders ultrasonically dispersed in distilled water were recorded as discussed by Bangal et al [13].…”

Section: Methodsmentioning

confidence: 99%

Structural and optical properties of zinc oxide nanopowders doped with Mn

Abrishami

Hosseini

Kakhki

et al. 2010

Phys. Status Solidi (c)

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Pure ZnO and Zn1‐xMnxO (x = 0, 0.02, 0.06, 0.10, 0.15) nanopowders have been synthesized by sol gel technique at low temperatures. XRD results indicate that the powder has a hexagonal polycrystalline structure without secondary phases. The nanopowders were characterized using the X‐ray diffraction (XRD) and transmission electron microscopy (TEM) observation. Kramers‐Kronig's analysis of mid‐IR reflectance spectra were employed to determine the doping effect on the optical constants and optical phonon modes frequencies. The optical band gap energy decreases from 3.22 eV to 3.12 eV for pure ZnO and Zn0.9Mn0.1O dispersed powders, respectively (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Semiconductor Nanoparticles

Cited by 32 publications

References 31 publications

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Novel method to synthesize and characterize Zinc Sulfide nanoparticles

Structural and optical properties of zinc oxide nanopowders doped with Mn

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