Optical characterization of ZnO nanoparticles capped with various surfactants

Singla, Madan Lal; M, Muhamed Shafeeq; Kumar, Manish

doi:10.1016/j.jlumin.2008.11.021

Cited by 123 publications

(66 citation statements)

References 39 publications

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“…The absorption spectra of ZnO/ethanol solution in the UV and visible range are presented in figure 4. A blank solution of ethanol is taken as reference [22]. λ 1/2 (wavelength at which the absorption is 50% of that at the excitonic peak [23]) in figure 4 moves toward higher wavelengths by increasing the annealing temperature.…”

Section: Uv-vis Spectroscopy and Band Gap Determinationmentioning

confidence: 99%

The effect of complexing agent on the crystallization of ZnO nanoparticles

2011

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In this work, some structural and optical properties of the zinc oxide (ZnO) nanoparticles were studied. The highly crystalline ZnO nanoparticles were produced by the hydrothermal and solgel methods. The analyses of the XRD patterns, STEM images and UV spectroscopy showed that the size of the nanoparticles prepared by oxalic acid was smaller than the ones by urea. The properties of oxalic acid and urea were also investigated to determine the most effective crystallization process of ZnO nanoparticles. It has been shown that pH, decomposition temperature and activity coefficient of the complexing agent have certain effects on crystallization process.

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Section: Uv-vis Spectroscopy and Band Gap Determinationmentioning

confidence: 99%

The effect of complexing agent on the crystallization of ZnO nanoparticles

2011

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“…Nanocomposite (NCp) of semiconductor nanocrystals (NCs) embedded in polymer matrix [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] is highly desirable in order to exploit the full potential of NC's applications in optoelectronic devices, gas sensors, etc. Polymers provide flexibility, processibility, and chemical Electronic supplementary material The online version of this article (doi:10.1007/s10853-015-9481-3) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

“…passivation, keeping intact the optoelectronic properties of semiconductor NCs or improving it. In last decades, the need to find out suitable techniques to create NCps of semiconductor NCs embedded in a polymer matrix has led to extensive research in this field [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Finding new routes for driving organic polymers and inorganic NCs to self-assemble into NCps is one of the main issues.…”

Section: Introductionmentioning

confidence: 99%

“…Further, it is interesting to note that CdS NCs embedded in PVP matrix has shown promising and better NLO property as compared to bare CdS NCs as well as CdS NCs embedded in other polymer matrices [21][22][23]. CdS-PVP NCp has been investigated for various nonlinear and linear optical properties [2][3][4][5][6][7][8][9][10][11][12][13][14][15]23].…”

Section: Introductionmentioning

confidence: 99%

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Insight into co-operative growth of nearly monodispersive CdS nanocrystals embedded in polyvinyl pyrrolidone

et al. 2015

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Nanocomposites of CdS nanocrystals (NCs) embedded in a polyvinyl pyrrolidone are grown using onestep chemical bath deposition technique. While this method eliminates an additional step for the growth of NCs, it also leads to the formation of nearly monodispersive CdS NCs as indicated by absorption, reflection, and photoluminescence spectroscopy. Further, scanning electron microscopy, energy-dispersive spectroscopy, and transmission electron microscopic investigations reveal the formation of nearly monodispersive CdS NCs (*6 to 10 nm) embedded in PVP spheres of sizes *100 to 600 nm. Systematic study of variation in Cadmium acetate (Cd ion source), Thiourea (S ion source), PVP concentration, deposition time, and heating/cooling cycles elucidates the co-operative growth mechanism for CdS-PVP nanocomposite. The experimental observations of this study are corroborated with existing theoretical simulations for nanocomposite growth, which explicates that collapse of PVP into a sphere is crucial to inclusion of only nearly monodispersive CdS NCs. Important insights obtained from this work give control on the growth of nearly monodispersive CdS NCs embedded in PVP, using a simple and inexpensive growth technique.

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“…Most preferred nanoparticles are Zinc Oxide (ZnO) NPs due to their unique physical and chemical properties. The distinguished property of ZnO NPS is to generate reactive oxygen species (ROS) which makes it possible to act as an antimicrobial agent (Szabo et al, 2003;Singla et al, 2009;Gupta et al, 2006;Kuo et al, 2009). The surface defects present on the surface of ZnO usually pick up anionic species depending on the synthesis route or on giving annealing treatments .…”

Section: Introductionmentioning

confidence: 99%

Interaction of Nanoparticles in Biological Systems and their Role in Therapeutical Treatment of Tuberculosis and Cancer

Meena¹,

Singh²,

Sahare³

et al. 2014

JLA

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The kind of interactions which nanoparticles show in the biological systems is very interesting. Nanoparticles (NPs) on entering the living system immediately come in contact with proteins which serve many applications of nanoparticles including bio-signalling, therapeutics and drug delivery systems. Moreover, many inorganic oxide nanoparticles can also serve the purpose of antibacterial/antiviral by assisting in the production of reactive oxygen species (ROS). The role of nanoparticles in therapeutics is very significant and increasing day-by-day as it assures better treatment to the patient by enhancing activity of drug, improving bioavailability, flexibility in deciding route of administration and long term stability of drug resulting in better treatments of diseases. NPs such as solid lipid NPs, polymeric NPs, porous NPs, liposomes are being used for treatment of various types of diseases. Numerous carriers based drug delivery systems incorporating anti-TB drugs have been developed for target site actions. NPs encapsulating anti-cancer drugs such as doxorubicin, paclitaxel have also been developed for treatment of different types of cancers. Results of these studies give hopes to the researchers for the use of nanoparticles in the field of therapeutics. The NPs can be toxic as well as nontoxic to the biological system. Therefore, some adverse effects, such as, cytotoxicity on inhaling some kinds of nanoparticles must be kept in mind for judicious use of such systems during synthesis or during handling. The paper describes recent developments in the field by reviewing the available literature.

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Optical characterization of ZnO nanoparticles capped with various surfactants

Cited by 123 publications

References 39 publications

The effect of complexing agent on the crystallization of ZnO nanoparticles

The effect of complexing agent on the crystallization of ZnO nanoparticles

Insight into co-operative growth of nearly monodispersive CdS nanocrystals embedded in polyvinyl pyrrolidone

Interaction of Nanoparticles in Biological Systems and their Role in Therapeutical Treatment of Tuberculosis and Cancer

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