Photostabilization of dye on anatase titania nanoparticles by polymer capping

Manorama, Sunkara V.; Reddy, K. Mohan; Reddy, Ch. Venkat; Narayanan, S.; Raja, P.; Chatterji, P. R.

doi:10.1016/s0022-3697(01)00089-0

Cited by 35 publications

(15 citation statements)

References 18 publications

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“…[6][7][8]. Among these methods, polymer capping in a chemical method has been developed to synthesize nanoparticles with highly surface stability, and also has significant influence on the morphology and optical properties of nanoparticles [9]. Various wet chemical methods have been developed for the synthesis of sulphide nanoparticles [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Saravanan

Diwakar

Mohankumar

et al. 2011

Nanomaterials and Nanotechnology

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Highly monodispersed CdS nanoparticles using polyvinyl pyrrolidone (PVP) as the capping agent were synthesised by chemical coprecipitation method. The surface-modified cadmium sulfide nanoparticles were found to be remarkably stable. In the presence of PVP, cubic phase with small grain size of CdS were observed in XRD. The peaks were identified to originate from (111), (220) and (311) planes of CdS, respectively. The crystallite size of the synthesised CdS nanoparticles was about 3 nm calculated from the (111) plane of XRD pattern and it was also confirmed through HRTEM. Morphology and elemental mapping of the synthesised nanoparticles were studied by SEM and EDX analyses. Increase in the band gap with decrease in the particle size was observed from the reflectance mode UV spectrum, which confirms the quantum confinement effect. From the photoluminescence studies, enhanced near-band-edge blue light emission and significantly reduced defect-related green emission were observed. Longitudinal optical (LO) phonon modes, corresponds to pure CdS were observed in Raman spectrum.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Saravanan

Diwakar

Mohankumar

et al. 2011

Nanomaterials and Nanotechnology

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“…A sharp peak observed at 1636-1656 cm -1 corresponds to the . A very weak band in the range 1324-1390 cm -1 is also seen in the FTIR spectra, which is due to the C-H vibrations of surfactants, existence of these peaks shows proper capping of Titania with different surfactants during preparation process 24 . A broad peak seen in the range between 581-918 cm -1 were due to the vibrations of six co-ordinated TiO 6 octahedron and four coordinated Ti-O starching of anatase titania.…”

Section: Fesem and Eds Analysismentioning

confidence: 84%

Preparation, Characterization and Photocatalytic Activities of TiO2 towards Methyl Red Degradation

Vishwanatha¹,

Shankar²,

Eknath³

et al. 2017

Orient. J. Chem

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Highly efficient, photoactive, nanocrystalline TiO 2 powder was prepared with the help of modified sol-gel method. The prepared nanomaterials were characterized by modern techniques such as, TG-DTA, XRD, FE-SEM, EDX, TEM, BET surface area and FT-IR analysis for the identification of phase structure, phase composition and morphology. Formation of thermally stable, nanocrystalline, highley photocatalytic active, tetragonal anatase Titania was confirmed by TGA-DTA, XRD and HR-TEM. Similarly, FE-SEM confirms spherical, cauliflower like morphology for all Titania samples prepared with different cationic surfactants. The presence of mesoporous Titania was also confirmed by N 2 adsorption-desorption. The effect of addition of various surfactants significantly improves the photocatalytic activity. Prepared nanomaterials were successfully tested under UV-Vis light region for photodegradation of Methyl Red (MR) dye material which is act as water pollutant. The C 16 TAB assisted Titania exhibits enhance photocatalytic efficiency as compared to industrially applied photocatalyst, Titania (Degussa P25) and zinc oxide under similar experimental condition.

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“…As follows from Eq. [142,143], Sb 2 S 3 [142], HgS [83,144,145], ZnS [37,76,83,129,[146][147][148][149][150][151][152][153][154][155][156][157], Zn 1-x Mn x S [157], In 2 S 3 [158,159], MoS 2 [160,161], PbS [33,37,58,59,76,77,110, [75,123,[189][190][191][192][193][194], PbO 2 [195], CeO 2 [134,196,197], Cu 2 O [198,199], VO 2 [200], selenides and composites based on themCdSe [20, 22, 24, 27, 30, 44-48, 91, 94, 96, 128, 141, 165, 201-232]...…”

Section: The Effect Of Spatial Restriction Of the Exciton On The Posimentioning

confidence: 99%

“…Thus, the question of the nature of the hypsochromic shift of λ tr in the absorption spectra of TiO 2 nanoparticles with decrease of their size still remains debatable. In most papers devoted to ultradisperse particles of TiO 2 the increase in the energy of the first optical transition with decrease in the size of the particles is associated with the appearance of quantum size effects [75,123,[189][190][191][192][193]. However, the authors in [194] on the other hand state that the reason for the hypsochromic shift of λ tr in the absorption spectra of TiO 2 nanoparticles with size 2R ³ 1.0 nm involves a change of the selection rules for the various types of electronic transitions and the realization of direct band-band transitions, with energy exceeding E g , not characteristic of the bulk crystals of titanium dioxide.…”

Section: The Effect Of Spatial Restriction Of the Exciton On The Posimentioning

confidence: 99%

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

et al. 2005

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The appearance of quantum size effects in ultradisperse semiconductors, their quantitative analysis, and their effect on the absorption of light and on the photophysical (vibrational relaxation of photogenerated "hot" charge carriers, band-band and "defect" luminescence) and certain primary photochemical processes (the accumulation of excess negative charge by the semiconductor nanoparticles, interphase electron transfer, etc.) are discussed.

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Photostabilization of dye on anatase titania nanoparticles by polymer capping

Cited by 35 publications

References 18 publications

Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Synthesis, Structural and Optical Properties of PVP Encapsulated CdS Nanoparticles

Preparation, Characterization and Photocatalytic Activities of TiO2 towards Methyl Red Degradation

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

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